Pub Date : 2022-07-01DOI: 10.21608/ajdsm.2021.56547.1146
Sayed Muhammad, M. Masoud, O. Baraka
Objective: To evaluate the fitting, flexure strength and clasp retentive force and deformation of RPD frameworks made from cobalt chromium and polyetheretherketone. Materials and Methods: Mandibular cast with a unilateral bounded saddle was fabricated, scaned and transferred to Exocad software. Twenty frameworks were fabricated and divided into two groups, group I for PEEK fabricated by CAD/CAM milling technique and group II for Co-Cr fabricated by conventional lost wax technique from 3-D printed resin pattern. Framework fitness was evaluated by replica technique and weighing by a digital analytical balance. Retention was measured by applying withdrawal force to frameworks by a universal testing machine. Deformation of clasps was evaluated by measuring the distance between 2 reference points on the tips of the retentive and reciprocal arms before and after repeated insertion/removal cycles by a chewing simulator. Biaxial flexure strength was determined using a piston-on-3points technique. Results: PEEK material group showed more adaptation than metal. For retention and deformation, metal group recorded higher retention mean value than PEEK but due to the higher deformation in metal there was no significant difference in retention after one year of use simulation. Metal group recorded higher flexure strength than PEEK. Conclusions: Within the limitations of this study, it could be concluded that milled PEEK frameworks have better tissue surface adaptation, totally acceptable retention forces reaches between 9 and 12N, and flexure strength between 137 and 144MPa. which is valid for clinical use.
{"title":"In vitro comparison between some mechanical properties of CAD/CAM polyetheretherketone and conventional cobalt chromium frameworks in removable partial denture","authors":"Sayed Muhammad, M. Masoud, O. Baraka","doi":"10.21608/ajdsm.2021.56547.1146","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.56547.1146","url":null,"abstract":"Objective: To evaluate the fitting, flexure strength and clasp retentive force and deformation of RPD frameworks made from cobalt chromium and polyetheretherketone. Materials and Methods: Mandibular cast with a unilateral bounded saddle was fabricated, scaned and transferred to Exocad software. Twenty frameworks were fabricated and divided into two groups, group I for PEEK fabricated by CAD/CAM milling technique and group II for Co-Cr fabricated by conventional lost wax technique from 3-D printed resin pattern. Framework fitness was evaluated by replica technique and weighing by a digital analytical balance. Retention was measured by applying withdrawal force to frameworks by a universal testing machine. Deformation of clasps was evaluated by measuring the distance between 2 reference points on the tips of the retentive and reciprocal arms before and after repeated insertion/removal cycles by a chewing simulator. Biaxial flexure strength was determined using a piston-on-3points technique. Results: PEEK material group showed more adaptation than metal. For retention and deformation, metal group recorded higher retention mean value than PEEK but due to the higher deformation in metal there was no significant difference in retention after one year of use simulation. Metal group recorded higher flexure strength than PEEK. Conclusions: Within the limitations of this study, it could be concluded that milled PEEK frameworks have better tissue surface adaptation, totally acceptable retention forces reaches between 9 and 12N, and flexure strength between 137 and 144MPa. which is valid for clinical use.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124933793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.21608/ajdsm.2021.86350.1214
Mohamed Elesawy, Hafez Bahnassawi, Y. Baraka
Objectives : The purpose of the present study was to evaluate the phonetic method for determining the vertical dimension of occlusion in complete denture construction as compared to the rest vertical dimension method and the height of occlusal rim method. Subjects and methods : Fifteen completely edentulous patients were involved in the study, patients age ranged between 40-60 years with a mean age of 54.40 years. Vertical Dimension of Occlusion (VDO) was measured using three different methods, phonetic method, physiologic rest position and height of occlusal rim method. The upper cast was mounted on a semi-adjustable articulator using the maxillary face bow, after adjustment of upper occlusal rim height and orientation, followed by centric relation recording and mounting of the lower cast. The mean inter- arch distance (IAD) of the three methods were measured on the articulator. The results were tabulated and statistically analyzed. Results: There was statistically no significant difference in the mean Inter-arch distance measured by the three mentioned methods. As well as, significantly positive correlation was found between the methods. Conclusion: Phonetic method was more reliable method than the physiologic rest position method in measuring the OVD. The heightof occlusal rim method considered encouraging but must be confirmed by further investigations on larger sample of patients.
{"title":"Evaluation of the phonetic method for determining the vertical dimension of occlusion in complete denture construction","authors":"Mohamed Elesawy, Hafez Bahnassawi, Y. Baraka","doi":"10.21608/ajdsm.2021.86350.1214","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.86350.1214","url":null,"abstract":"Objectives : The purpose of the present study was to evaluate the phonetic method for determining the vertical dimension of occlusion in complete denture construction as compared to the rest vertical dimension method and the height of occlusal rim method. Subjects and methods : Fifteen completely edentulous patients were involved in the study, patients age ranged between 40-60 years with a mean age of 54.40 years. Vertical Dimension of Occlusion (VDO) was measured using three different methods, phonetic method, physiologic rest position and height of occlusal rim method. The upper cast was mounted on a semi-adjustable articulator using the maxillary face bow, after adjustment of upper occlusal rim height and orientation, followed by centric relation recording and mounting of the lower cast. The mean inter- arch distance (IAD) of the three methods were measured on the articulator. The results were tabulated and statistically analyzed. Results: There was statistically no significant difference in the mean Inter-arch distance measured by the three mentioned methods. As well as, significantly positive correlation was found between the methods. Conclusion: Phonetic method was more reliable method than the physiologic rest position method in measuring the OVD. The heightof occlusal rim method considered encouraging but must be confirmed by further investigations on larger sample of patients.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126432376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-01DOI: 10.21608/ajdsm.2021.86023.1212
Mohamed Yousef, Ashraf S. Refai, Taher M. Islam
Objectives: This study was aimed to evaluate the success of adult pulpotomies for permanent molars with irreversible pulpitis using MTA versus Biodentine. Subjects and Methods : Forty-four patients with carious permanent molars with signs and symptoms of irreversible pulpitis were included in the study. Cases were randomly grouped into 2 groups: MTA and Biodentine. After caries removal and access cavity preparation, excavation of all coronal pulp to the floor of the pulp chamber was achieved. Control of bleeding was done using pressure with a saline-soaked cotton pellet. The capping material was prepared according to the manufacturer’s instructions. In the MTA group, after MTA application to the floor of the pulp chamber, a wet cotton pellet was placed over the MTA, then the tooth was temporized. Forty-eight hours later, the cotton pellet was removed, and the final filling was applied. In the Biodentine group, the final filling was placed 12 min. after Biodentine application. The patients were followed after 12, and 18 months. Results : After 12-months follow-up, the success rate was 86.4% for the MTA versus 81.8% for the Biodentine. After 18-months, the success rate was 85.7% for the MTA versus 75% for the Biodentine. There was no statistically significant difference between the success rate of MTA and Biodentine. Conclusions : Higher success rate could be attained in adult pulpotomies using bioactive materials. Irreversible pulpitis is not a contraindication for adult pulpotomies.
{"title":"Evaluation of The Success of Mature Molar Pulpotomies Using MTA Versus Biodentine. A Clinical Study","authors":"Mohamed Yousef, Ashraf S. Refai, Taher M. Islam","doi":"10.21608/ajdsm.2021.86023.1212","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.86023.1212","url":null,"abstract":"Objectives: This study was aimed to evaluate the success of adult pulpotomies for permanent molars with irreversible pulpitis using MTA versus Biodentine. Subjects and Methods : Forty-four patients with carious permanent molars with signs and symptoms of irreversible pulpitis were included in the study. Cases were randomly grouped into 2 groups: MTA and Biodentine. After caries removal and access cavity preparation, excavation of all coronal pulp to the floor of the pulp chamber was achieved. Control of bleeding was done using pressure with a saline-soaked cotton pellet. The capping material was prepared according to the manufacturer’s instructions. In the MTA group, after MTA application to the floor of the pulp chamber, a wet cotton pellet was placed over the MTA, then the tooth was temporized. Forty-eight hours later, the cotton pellet was removed, and the final filling was applied. In the Biodentine group, the final filling was placed 12 min. after Biodentine application. The patients were followed after 12, and 18 months. Results : After 12-months follow-up, the success rate was 86.4% for the MTA versus 81.8% for the Biodentine. After 18-months, the success rate was 85.7% for the MTA versus 75% for the Biodentine. There was no statistically significant difference between the success rate of MTA and Biodentine. Conclusions : Higher success rate could be attained in adult pulpotomies using bioactive materials. Irreversible pulpitis is not a contraindication for adult pulpotomies.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"48 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132226863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-01DOI: 10.21608/ajdsm.2021.81438.1208
M. Hamdy, Alaa Eldeen Mohamed Esmail, Al-baraa Abbas
Objective: This study was directed to compare the efficacy of VibraJect (VJ) and DentalVibe (DV) comfort systems and Topical anesthesia (TA) (20% benzocaine) in relieving of pain associated with local injection in children. Subjects and methods: This study was conducted as a prospective blind randomized controlled clinical trial. A total of 150 children, who were attending dental treatment in the pediatric dental clinic, were selected. Subjects were equally divided according to used method into three groups (50 each). Fifty Subjects received into local anesthetic injections with VJ; fifty subjects received into local anesthetic (LA) injections with DV comfort system; fifty subjects received into local anesthetic injections with TA. Pain during injection was evaluated subjectively using Wong-Baker FACES pain rating scale by showing the scale to the child and asking him/her to choose a face that best described his/her feeling. Pain also had been objectively evaluated using face, leg, activity, cry and consolability (FLACC) scale by observing the child behavior during anesthesia administration. Results: This study revealed that vibration applied using the VJ and DV decreased pain associated with a LA injection delivered via infiltration and nerve block. Subjects in the VJ and DV groups had significantly lower pain scores than those in the control (TA) group. Conclusion: In this study, VJ and DV reduced pain during LA injection without causing anxiety in comparison to conventional injection.
{"title":"Assessment of VibraJect and DentalVibe Comfort Systems Efficacy in Relieving of Pain Associated with Local Injection in Children","authors":"M. Hamdy, Alaa Eldeen Mohamed Esmail, Al-baraa Abbas","doi":"10.21608/ajdsm.2021.81438.1208","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.81438.1208","url":null,"abstract":"Objective: This study was directed to compare the efficacy of VibraJect (VJ) and DentalVibe (DV) comfort systems and Topical anesthesia (TA) (20% benzocaine) in relieving of pain associated with local injection in children. Subjects and methods: This study was conducted as a prospective blind randomized controlled clinical trial. A total of 150 children, who were attending dental treatment in the pediatric dental clinic, were selected. Subjects were equally divided according to used method into three groups (50 each). Fifty Subjects received into local anesthetic injections with VJ; fifty subjects received into local anesthetic (LA) injections with DV comfort system; fifty subjects received into local anesthetic injections with TA. Pain during injection was evaluated subjectively using Wong-Baker FACES pain rating scale by showing the scale to the child and asking him/her to choose a face that best described his/her feeling. Pain also had been objectively evaluated using face, leg, activity, cry and consolability (FLACC) scale by observing the child behavior during anesthesia administration. Results: This study revealed that vibration applied using the VJ and DV decreased pain associated with a LA injection delivered via infiltration and nerve block. Subjects in the VJ and DV groups had significantly lower pain scores than those in the control (TA) group. Conclusion: In this study, VJ and DV reduced pain during LA injection without causing anxiety in comparison to conventional injection.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114629628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-01DOI: 10.21608/ajdsm.2020.50585.1137
esam abd el reheim, A. Elfeky, A. Hosny
Objective: to evaluate the alveolar ridge augmentation with titanium mesh adapted on 3D model and bone substitute graft in the mandible. Subjects and Methods: A total of 14 patients with mandibular alveolar ridge defects were selected. A preliminary CBCT scan was performed to evaluate alveolar residual bone anatomy and to created 3D model then adapted titanium mesh on the model before surgery. The deficient bone site was exposed by making a three line pyramidal flap. The recipient site was decorticated using diamond round bur. The titanium mesh fixed firstly lingual by 1.5mm diameter micro screws selfdrilling, then applied bone graft in the recipient site and adapted by condenser. Then titanium mesh fixed buccally by 1.5mm diameter micro screws. The flaps were repositioned and sutured passively with 4-0 vicryl suture. Results: Results revealed that, there was statistically a significantly higher value in bone height and width after 4 months of bone augmentation and there was statistically a significantly lower value of bone density after 4 months of bone augmentation. Conclusion: The use of titanium mesh in bone augmentation have a protective effect to the grafted bone during the healing period. The use of the titanium mesh has disadvantages, for example, the necessity of a second surgical step increases the morbidity for the patient and it has a risk of soft tissue dehiscence and membrane exposure. 3D model provide more time for adaptation of the titanium mesh during time of surgery.
{"title":"Evaluation of alveolar ridge augmentation with titanium mesh adapted on 3D model and bone substitute graft in the mandible.","authors":"esam abd el reheim, A. Elfeky, A. Hosny","doi":"10.21608/ajdsm.2020.50585.1137","DOIUrl":"https://doi.org/10.21608/ajdsm.2020.50585.1137","url":null,"abstract":"Objective: to evaluate the alveolar ridge augmentation with titanium mesh adapted on 3D model and bone substitute graft in the mandible. Subjects and Methods: A total of 14 patients with mandibular alveolar ridge defects were selected. A preliminary CBCT scan was performed to evaluate alveolar residual bone anatomy and to created 3D model then adapted titanium mesh on the model before surgery. The deficient bone site was exposed by making a three line pyramidal flap. The recipient site was decorticated using diamond round bur. The titanium mesh fixed firstly lingual by 1.5mm diameter micro screws selfdrilling, then applied bone graft in the recipient site and adapted by condenser. Then titanium mesh fixed buccally by 1.5mm diameter micro screws. The flaps were repositioned and sutured passively with 4-0 vicryl suture. Results: Results revealed that, there was statistically a significantly higher value in bone height and width after 4 months of bone augmentation and there was statistically a significantly lower value of bone density after 4 months of bone augmentation. Conclusion: The use of titanium mesh in bone augmentation have a protective effect to the grafted bone during the healing period. The use of the titanium mesh has disadvantages, for example, the necessity of a second surgical step increases the morbidity for the patient and it has a risk of soft tissue dehiscence and membrane exposure. 3D model provide more time for adaptation of the titanium mesh during time of surgery.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114394958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-01DOI: 10.21608/ajdsm.2021.78550.1203
S. Saad, Alaa Al Deen Mohamed Ismai, Nermeen Bellah, Mohamed Mohamed
Objective: This research to evaluate and compare the effect of moringa oleifera (MO) extract on the stemness properties of human dental pulp stem cells (DPSCs). Subjects and methods: (DPSCs) were isolated from the pulp of three permanent teeth indicated for extraction for therapeutic purposes. DPSCs were cultured with moringa oleifera extract at concentration 100μg/ ml, and with Ca(OH) 2 and MTA extracts as positive controls. Cells cultured without any extract were used as negative controls. Stemness properties of DPSCs were assessed in terms of proliferation, migration, and the ability to enhance wound healing. Moreover, the osteogenic differentiation potential of DPSCs cultured with MO extract was evaluated. Results: No significant statistical between groups was detected regarding cell proliferation rate. The number of migrated DPSCs towards the MO was significantly lower than that in the -ve control group (p<0.000005). Also, there was a significant difference between the number of migrated DPSCs in the MO group and that in the +ve control groups (p<0.000005). The ability to enhance the healing of the wound was higher in the MTA group rather than in the MO group. Finally, successful osteogenic differentiation of DPSCs manifested as calcified nodules occurred in all groups. Conclusions: Despite the limitations of this study, MO proved to have no adverse effect on DPSCs proliferation rate and can induce osteogenic differentiation of DPSCs. On the other hand, MO showed little effect on cell migration and wound healing in DPSCs. Moringa oleifera.
{"title":"Effect of Moringa Oleifera on Human Dental Pulp Stem Cells: An in-vitro study","authors":"S. Saad, Alaa Al Deen Mohamed Ismai, Nermeen Bellah, Mohamed Mohamed","doi":"10.21608/ajdsm.2021.78550.1203","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.78550.1203","url":null,"abstract":"Objective: This research to evaluate and compare the effect of moringa oleifera (MO) extract on the stemness properties of human dental pulp stem cells (DPSCs). Subjects and methods: (DPSCs) were isolated from the pulp of three permanent teeth indicated for extraction for therapeutic purposes. DPSCs were cultured with moringa oleifera extract at concentration 100μg/ ml, and with Ca(OH) 2 and MTA extracts as positive controls. Cells cultured without any extract were used as negative controls. Stemness properties of DPSCs were assessed in terms of proliferation, migration, and the ability to enhance wound healing. Moreover, the osteogenic differentiation potential of DPSCs cultured with MO extract was evaluated. Results: No significant statistical between groups was detected regarding cell proliferation rate. The number of migrated DPSCs towards the MO was significantly lower than that in the -ve control group (p<0.000005). Also, there was a significant difference between the number of migrated DPSCs in the MO group and that in the +ve control groups (p<0.000005). The ability to enhance the healing of the wound was higher in the MTA group rather than in the MO group. Finally, successful osteogenic differentiation of DPSCs manifested as calcified nodules occurred in all groups. Conclusions: Despite the limitations of this study, MO proved to have no adverse effect on DPSCs proliferation rate and can induce osteogenic differentiation of DPSCs. On the other hand, MO showed little effect on cell migration and wound healing in DPSCs. Moringa oleifera.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116242031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-01DOI: 10.21608/ajdsm.2021.101285.1258
A. Sayed, Rania Mubarak
Objective: Proficient polymerization of resin composites is essential to obtain long term clinical success and has a great significance attaining improved mechanical properties. The purpose of this study was to investigate the effects of two curing light intensities on the mechanical properties (Vickers microhardness) of bulk-fill resin-based composites. Materials and methods: An in vitro investigation was carried out, where a total of 40 cylinders were fabricated utilizing Tetric N-Ceram bulk fill (TNC) and SDR Plus bulk fill flowable (SDR) (n=20). Each material group, specimens were divided into two subgroups according to the light intensities; full mode and turbo mode (n=10). Resin composite specimens were prepared in clinically realistic layer thicknesses (4 mm). The specimens were irradiated from only one side for the suggested time for both curing modes. Vickers hardness number (VHN) was measured on the top and bottom surfaces of resin composite specimens 24h after light-curing. Bottom/top ratio [Vickers hardness ratio (VHR)] was calculated as a measure of depth-dependent during effectiveness. Results: The results revealed that the irradiation of TNC with either full mode or turbo mode showed no statistical significant difference in VHN values either on top or bottom surfaces and VHR. Meanwhile, SDR irradiated with full mode showed higher VHN values compared to samples irradiated with turbo mode on both top and bottom surfaces and VHR. Conclusion: Rapid and high curing light intensity could be used for polymerizing TNC restorations. TNC reported higher hardness values when compared with SDR employing both curing modes.
目的:熟练的聚合树脂复合材料是获得长期临床成功的必要条件，对获得更好的力学性能具有重要意义。本研究的目的是研究两种固化光强度对块体填充树脂基复合材料力学性能(维氏显微硬度)的影响。材料与方法:进行体外实验，采用trtric n - ceram散装填料(TNC)和SDR Plus可流动散装填料(SDR)共制备40个圆柱体(n=20)。每一材料组，标本按光照强度分为两个亚组;Full模式和turbo模式(n=10)。采用临床实际厚度(4 mm)制备树脂复合标本。在两种固化模式下，仅从一侧照射样品，照射时间均为建议时间。光固化24h后，测定树脂复合材料试样的上下表面维氏硬度值(VHN)。底部/顶部比[维氏硬度比(VHR)]被计算为有效期间与深度相关的度量。结果:结果显示，无论是全模式还是涡轮模式照射TNC，其上、下表面VHN值和VHR均无统计学差异。同时，与涡轮模式辐照样品相比，全模式辐照的SDR在上下表面和VHR上均显示出更高的VHN值。结论:快速、高固化光强可用于TNC修复体的聚合。与采用两种固化方式的SDR相比，TNC报告了更高的硬度值。
{"title":"Influence of high irradiance light curing on the micromechanical properties of bulk fill resin-based composites.","authors":"A. Sayed, Rania Mubarak","doi":"10.21608/ajdsm.2021.101285.1258","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.101285.1258","url":null,"abstract":"Objective: Proficient polymerization of resin composites is essential to obtain long term clinical success and has a great significance attaining improved mechanical properties. The purpose of this study was to investigate the effects of two curing light intensities on the mechanical properties (Vickers microhardness) of bulk-fill resin-based composites. Materials and methods: An in vitro investigation was carried out, where a total of 40 cylinders were fabricated utilizing Tetric N-Ceram bulk fill (TNC) and SDR Plus bulk fill flowable (SDR) (n=20). Each material group, specimens were divided into two subgroups according to the light intensities; full mode and turbo mode (n=10). Resin composite specimens were prepared in clinically realistic layer thicknesses (4 mm). The specimens were irradiated from only one side for the suggested time for both curing modes. Vickers hardness number (VHN) was measured on the top and bottom surfaces of resin composite specimens 24h after light-curing. Bottom/top ratio [Vickers hardness ratio (VHR)] was calculated as a measure of depth-dependent during effectiveness. Results: The results revealed that the irradiation of TNC with either full mode or turbo mode showed no statistical significant difference in VHN values either on top or bottom surfaces and VHR. Meanwhile, SDR irradiated with full mode showed higher VHN values compared to samples irradiated with turbo mode on both top and bottom surfaces and VHR. Conclusion: Rapid and high curing light intensity could be used for polymerizing TNC restorations. TNC reported higher hardness values when compared with SDR employing both curing modes.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126210904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-01DOI: 10.21608/ajdsm.2021.68883.1191
Tareq El-Shamy, H. Mandour, M. Assadawy, O. Shaker
Objective: Oral lichen planus (OLP) is a common chronic inflammatory mucosal disease in which T-cell mediated immune responses are implicated in the pathogenesis. TNF has been found to be involved in the pathogenesis of many inflammatory or autoimmune diseases such as lichen planus. Various treatments have been employed to treat symptomatic OLP, but a complete cure is very difficult to achieve because of its recalcitrant nature. Topical corticosteroids therapy of OLP has shown conflicting results in many reports. Natural products have served as a major source of drugs for centuries, this study aimed to evaluate the effectiveness of topical intra-lesional chitosan in the treatment of oral erosive lichen planus. This was achieved via detection of salivary TNF-α level. Subjects and methods: The study was carried out using thirty-four patients of both sexes ranging in age between 30-50 years old with symptomatic erosive OLP and treated with intra-lesional 1% low molecular weight chitosan (50,000-190,000 Da) obtained from (Sigma-Aldrich, St. Louis, MO) and five healthy volunteers for estimation of the mean of normal salivary TNF-α. The appearance score, pain score, and salivary TNF-α of the target lesions were evaluated at weeks 0, 2, 4, and 16. Results: The study showed that there was a significant reduction of the mean of salivary TNF-α, VAS, score and criteria of clinical data which continued up to the end of the 4 months evaluation period as compared to the mean baseline value. Conclusion: Topical intra-lesional chitosan injection is effective for erosive OLP, which suggests that topical intra-lesional chitosan injection can be a promising therapeutic alternative for erosive OLP.
目的:口腔扁平苔藓(OLP)是一种常见的慢性炎症性粘膜疾病，其发病机制与t细胞介导的免疫应答有关。TNF已被发现参与许多炎症性或自身免疫性疾病的发病机制，如扁平苔藓。各种治疗方法已被用于治疗症状性OLP，但由于其顽固性，完全治愈是非常困难的。局部皮质类固醇治疗OLP在许多报告中显示出相互矛盾的结果。几个世纪以来，天然产物一直是药物的主要来源，本研究旨在评估局部病灶内壳聚糖治疗口腔糜烂性扁平苔藓的有效性。这是通过检测唾液TNF-α水平实现的。研究对象和方法:研究对象为34名男女，年龄在30-50岁之间，患有症状性糜糜性OLP，病变内使用来自(Sigma-Aldrich, St. Louis, MO)的1%低分子量甲酰糖(50,000-190,000 Da)治疗，以及5名健康志愿者，以估计正常唾液TNF-α的均值。分别于第0、2、4、16周评估目标病变的外观评分、疼痛评分和唾液TNF-α。结果:研究显示，与平均基线值相比，持续到4个月评估期结束时，唾液TNF-α、VAS、评分和临床数据标准的平均值均有显著降低。结论:局部病灶内注射壳聚糖治疗糜烂性OLP疗效显著，是治疗糜烂性OLP的理想选择。
{"title":"Evaluation of chitosan as a treatment modality for erosive oral lichen planus via detection of salivary TNF-α","authors":"Tareq El-Shamy, H. Mandour, M. Assadawy, O. Shaker","doi":"10.21608/ajdsm.2021.68883.1191","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.68883.1191","url":null,"abstract":"Objective: Oral lichen planus (OLP) is a common chronic inflammatory mucosal disease in which T-cell mediated immune responses are implicated in the pathogenesis. TNF has been found to be involved in the pathogenesis of many inflammatory or autoimmune diseases such as lichen planus. Various treatments have been employed to treat symptomatic OLP, but a complete cure is very difficult to achieve because of its recalcitrant nature. Topical corticosteroids therapy of OLP has shown conflicting results in many reports. Natural products have served as a major source of drugs for centuries, this study aimed to evaluate the effectiveness of topical intra-lesional chitosan in the treatment of oral erosive lichen planus. This was achieved via detection of salivary TNF-α level. Subjects and methods: The study was carried out using thirty-four patients of both sexes ranging in age between 30-50 years old with symptomatic erosive OLP and treated with intra-lesional 1% low molecular weight chitosan (50,000-190,000 Da) obtained from (Sigma-Aldrich, St. Louis, MO) and five healthy volunteers for estimation of the mean of normal salivary TNF-α. The appearance score, pain score, and salivary TNF-α of the target lesions were evaluated at weeks 0, 2, 4, and 16. Results: The study showed that there was a significant reduction of the mean of salivary TNF-α, VAS, score and criteria of clinical data which continued up to the end of the 4 months evaluation period as compared to the mean baseline value. Conclusion: Topical intra-lesional chitosan injection is effective for erosive OLP, which suggests that topical intra-lesional chitosan injection can be a promising therapeutic alternative for erosive OLP.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126186950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-01DOI: 10.21608/ajdsm.2021.85035.1211
A. Fayed, Hussien Mohamed, H. Othman
Objective: One of the major challenges in dentistry is the correct selection of tooth color as close to the natural adjacent tooth color as possible so this study was directed to develop an alternative way to traditional methods for shade matching. Subjects and Methods: A smartphone application was developed, a total of 1300 shade tab images (50 per shade tab) were captured using a smartphone camera with auto-mode settings and special ring light which emits 5500 k light temperature. The images were shot at angled distances of 14 – 20 cm from a shade guide. Color features were extracted and classified using K nearest neighbor classification algorithm (K-NN) to form a software training dataset. Sixty two upper central incisors were captured by smartphone and the shade of these teeth were matched using developed software and, visual methods compere to the spectrophotometer. Results: The matching accuracy using software gives 70% matching compare to the visual method which gives 65 % matching accuracy . Conclusions : Shade matching using a Smartphone application and Digital photography can emerge as a viable alternative to the use of spectrophotometers for shade selection in a clinical setup.
{"title":"A Comparison between visual shade matching and digital shade analysis system using K-NN algorithm","authors":"A. Fayed, Hussien Mohamed, H. Othman","doi":"10.21608/ajdsm.2021.85035.1211","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.85035.1211","url":null,"abstract":"Objective: One of the major challenges in dentistry is the correct selection of tooth color as close to the natural adjacent tooth color as possible so this study was directed to develop an alternative way to traditional methods for shade matching. Subjects and Methods: A smartphone application was developed, a total of 1300 shade tab images (50 per shade tab) were captured using a smartphone camera with auto-mode settings and special ring light which emits 5500 k light temperature. The images were shot at angled distances of 14 – 20 cm from a shade guide. Color features were extracted and classified using K nearest neighbor classification algorithm (K-NN) to form a software training dataset. Sixty two upper central incisors were captured by smartphone and the shade of these teeth were matched using developed software and, visual methods compere to the spectrophotometer. Results: The matching accuracy using software gives 70% matching compare to the visual method which gives 65 % matching accuracy . Conclusions : Shade matching using a Smartphone application and Digital photography can emerge as a viable alternative to the use of spectrophotometers for shade selection in a clinical setup.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"06 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127271099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-01DOI: 10.21608/ajdsm.2021.96768.1245
M. Gaafar, H. Al-khalifa, El-Hassanein El-Hassanein
Objective: This study aimed to Evaluate AOB correction in adult orthodontic patients by Using Rapid Molar Intruder and posterior bite plane. Subjects and Methods: The current study was conducted on 20 orthodontic patients (4 males and 16 females) with an age range from 16 to 22 years who were collected from the outpatient clinic at Orthodontic Department, Faculty of Dental Medicine, Boys, Al-Azhar University, Cairo, Egypt. They were randomly divided into two groups; each consisted of 10 patients. The first group consisted of 10 patients, who received Rapid Molar Intruder (RMI) appliance with fixed appliance therapy. The second group consisted of 10 patients, who received fixed appliance therapy with posterior bite planes. Results: The results show a statistically non-significant difference between both groups. Conclusions: In the present study, Both Rapid molar intruder (RMI) and posterior bite plane (PBP) are efficient solutions regarding open bite correction.
{"title":"Three-dimensional evaluation of anterior open bite correction in adult orthodontic patients: A prospective clinical study","authors":"M. Gaafar, H. Al-khalifa, El-Hassanein El-Hassanein","doi":"10.21608/ajdsm.2021.96768.1245","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.96768.1245","url":null,"abstract":"Objective: This study aimed to Evaluate AOB correction in adult orthodontic patients by Using Rapid Molar Intruder and posterior bite plane. Subjects and Methods: The current study was conducted on 20 orthodontic patients (4 males and 16 females) with an age range from 16 to 22 years who were collected from the outpatient clinic at Orthodontic Department, Faculty of Dental Medicine, Boys, Al-Azhar University, Cairo, Egypt. They were randomly divided into two groups; each consisted of 10 patients. The first group consisted of 10 patients, who received Rapid Molar Intruder (RMI) appliance with fixed appliance therapy. The second group consisted of 10 patients, who received fixed appliance therapy with posterior bite planes. Results: The results show a statistically non-significant difference between both groups. Conclusions: In the present study, Both Rapid molar intruder (RMI) and posterior bite plane (PBP) are efficient solutions regarding open bite correction.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132216055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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