Pub Date : 2021-09-27DOI: 10.23805/JO.2021.13.03.7
F. Signorino, N. Z. Nagibi, G. Allocca, C. Maiorana, P. Poli
Aim The aim of the present prospective clinical study was to evaluate the effectiveness of orally administered probiotic Lactobacillus reuteri in the treatment of peri-implant mucositis. Materials and methods Eighty patients showing peri-implant mucositis were enrolled and assigned to two different treatment groups. In the test group subjects were instructed to take one probiotic lozenge daily for 30 days. In the control group, patients received placebo. Periodontal indices including plaque index (PI), bleeding on probing (BOP), and probing depth (PD) were clinically recorded around natural teeth and implants at baseline and after a period of 1 month and 3 months. Results After 3-month evaluation in the test group the differences of plaque and bleeding indices remained statistically significantly lower compared to baseline at both teeth and implants. Contrariwise, no statistically significant differences of PI and BOP were observed in the control group. The intergroup comparison at 3 months yielded statistically significantly lower values for all periodontal parameters around teeth when the probiotic was used. Conversely, no statistically significant differences in periodontal parameters were observed between test and control groups at 3 months around implants. Conclusions Probiotic intake was effective in reducing PI, BOP, and PD scores around natural teeth and dental implants affected by peri-mucositis, in particular around natural teeth at 3 months.
{"title":"Effectiveness of orally administered probiotic Lactobacillus reuteri in patients with peri-implant mucositis: a prospective clinical study","authors":"F. Signorino, N. Z. Nagibi, G. Allocca, C. Maiorana, P. Poli","doi":"10.23805/JO.2021.13.03.7","DOIUrl":"https://doi.org/10.23805/JO.2021.13.03.7","url":null,"abstract":"Aim The aim of the present prospective clinical study was to evaluate the effectiveness of orally administered probiotic Lactobacillus reuteri in the treatment of peri-implant mucositis. \u0000Materials and methods Eighty patients showing peri-implant mucositis were enrolled and assigned to two different treatment groups. In the test group subjects were instructed to take one probiotic lozenge daily for 30 days. In the control group, patients received placebo. Periodontal indices including plaque index (PI), bleeding on probing (BOP), and probing depth (PD) were clinically recorded around natural teeth and implants at baseline and after a period of 1 month and 3 months. \u0000Results After 3-month evaluation in the test group the differences of plaque and bleeding indices remained statistically significantly lower compared to baseline at both teeth and implants. Contrariwise, no statistically significant differences of PI and BOP were observed in the control group. The intergroup comparison at 3 months yielded statistically significantly lower values for all periodontal parameters around teeth when the probiotic was used. Conversely, no statistically significant differences in periodontal parameters were observed between test and control groups at 3 months around implants. \u0000Conclusions Probiotic intake was effective in reducing PI, BOP, and PD scores around natural teeth and dental implants affected by peri-mucositis, in particular around natural teeth at 3 months.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82001266","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 : 2021-09-27DOI: 10.23805/JO.2021.13.03.8
B. Lee, S. Lee, Y. T. Kim
Aim The most common complication during maxillary sinus floor elevation is perforation of the Schneiderian membrane. Most of studies presented repair procedures via a lateral approach, which can induce additional complications. Therefore, in the present study the procedure was performed via crestal approach. Case report This study included three patients who showed a low residual alveolar bone height in the maxillary posterior edentulous region and in whom the placement of implants with sinus floor elevation was planned via a transalveolar approach. Perforation of the sinus membrane occurred during the procedure, and so collagen dressing material was inserted through the drilling hole to cover the perforated membrane. Xenogeneic bone was grafted under the elevated sinus membrane, and implants were placed simultaneously. The final prostheses were delivered at 6 to 8 months after the surgery. There were no complications in any of the patients. Results All implants showed successful stability, and no specific clinical or radiographic complication was observed during follow-ups lasting 2 to 3 years. Conclusion A crestal approach can be a reliable option when repairing a sinus membrane that is perforated during transalveolar sinus floor elevation.
{"title":"Crestal approach for the repair of the Schneiderian membrane perforated during transalveolar sinus elevation","authors":"B. Lee, S. Lee, Y. T. Kim","doi":"10.23805/JO.2021.13.03.8","DOIUrl":"https://doi.org/10.23805/JO.2021.13.03.8","url":null,"abstract":"Aim The most common complication during maxillary sinus floor elevation is perforation of the Schneiderian membrane. Most of studies presented repair procedures via a lateral approach, which can induce additional complications. Therefore, in the present study the procedure was performed via crestal approach. \u0000Case report This study included three patients who showed a low residual alveolar bone height in the maxillary posterior edentulous region and in whom the placement of implants with sinus floor elevation was planned via a transalveolar approach. Perforation of the sinus membrane occurred during the procedure, and so collagen dressing material was inserted through the drilling hole to cover the perforated membrane. Xenogeneic bone was grafted under the elevated sinus membrane, and implants were placed simultaneously. The final prostheses were delivered at 6 to 8 months after the surgery. There were no complications in any of the patients. \u0000Results All implants showed successful stability, and no specific clinical or radiographic complication was observed during follow-ups lasting 2 to 3 years. \u0000Conclusion A crestal approach can be a reliable option when repairing a sinus membrane that is perforated during transalveolar sinus floor elevation.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81227045","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}
Aim Clinical evaluation of the effect of using low profile versus self-aligning attachment mandibular over-denture on oral health related quality of life and denture retention. Material and Methods Forty-two patients were carefully selected, complete dentures fabricated, then two implants were placed in the canine region for each patient. Low profile attachments were used in group I and self-aligning attachments in group 2. Results Regarding oral health-related quality of life, there was a statistically significant improvement. Regarding overdenture retention, the low profile attachment group showed statistically significant higher retention force compared to that of the self-aligning group at the time of insertion; however, there was no statistically significant difference between two groups at the 6 months follow-up. Conclusion Both types of attachments offer good oral health-related quality of life for completely edentulous patients with limited inter-arch space. Regarding overdenture retention, low profile attachments presented higher retention values than self-aligning attachments at the beginning of the study but faster retention loss than self-aligning attachment over time.
{"title":"Evaluation of quality of life and denture retention of mandibular overdentures using low profile versus self-aligning attachments in completely edentulous patients with limited interarch space. A randomized clinical trial","authors":"A. Z. Al-Adl, M. Mostafa, A. Alsourori","doi":"10.23805/10.23805","DOIUrl":"https://doi.org/10.23805/10.23805","url":null,"abstract":"Aim Clinical evaluation of the effect of using low profile versus self-aligning attachment mandibular over-denture on oral health related quality of life and denture retention. \u0000Material and Methods Forty-two patients were carefully selected, complete dentures fabricated, then two implants were placed in the canine region for each patient. Low profile attachments were used in group I and self-aligning attachments in group 2. \u0000Results Regarding oral health-related quality of life, there was a statistically significant improvement. Regarding overdenture retention, the low profile attachment group showed statistically significant higher retention force compared to that of the self-aligning group at the time of insertion; however, there was no statistically significant difference between two groups at the 6 months follow-up. \u0000Conclusion Both types of attachments offer good oral health-related quality of life for completely edentulous patients with limited inter-arch space. Regarding overdenture retention, low profile attachments presented higher retention values than self-aligning attachments at the beginning of the study but faster retention loss than self-aligning attachment over time.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84188452","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 : 2021-09-21DOI: 10.23805/JO.2021.13.03.5
M. N. Gerhardt, K. Kreuzer, R. Shinkai
Aim To summarise data available in the PubMed database regarding the accuracy of dental implants placed by means of static and navigated guided surgery. Methods A search strategy was performed in order to find eligible articles in English reporting the accuracy of dental implants placed in humans with guided surgery techniques. Results The search resulted in 387 articles for screening. After the selection, 44 articles were included for data extraction. 22 articles reported the accuracy of static guided surgery with mucosa-supported guides, 20 with tooth-supported, 3 with bone-supported and 7 with dynamic guided surgery. Conclusions All studies with Static Guided Surgery and Dynamic Guided Surgery included in this review present deviations within the clinical accepted limits and represent excellent alternatives for guided implant placement.
{"title":"Literature on the accuracy of guided surgery for dental implants: A scoping review","authors":"M. N. Gerhardt, K. Kreuzer, R. Shinkai","doi":"10.23805/JO.2021.13.03.5","DOIUrl":"https://doi.org/10.23805/JO.2021.13.03.5","url":null,"abstract":"Aim To summarise data available in the PubMed database regarding the accuracy of dental implants placed by means of static and navigated guided surgery. \u0000Methods A search strategy was performed in order to find eligible articles in English reporting the accuracy of dental implants placed in humans with guided surgery techniques. \u0000Results The search resulted in 387 articles for screening. After the selection, 44 articles were included for data extraction. 22 articles reported the accuracy of static guided surgery with mucosa-supported guides, 20 with tooth-supported, 3 with bone-supported and 7 with dynamic guided surgery. \u0000Conclusions All studies with Static Guided Surgery and Dynamic Guided Surgery included in this review present deviations within the clinical accepted limits and represent excellent alternatives for guided implant placement.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81821655","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 : 2021-09-17DOI: 10.23805/JO.2021.13.03.4
M. Lopez, P. Passarelli, E. Rella, A. Netti, A. Lopez, M. Casale, A. D'addona
Aim Barriers made of cortical bone of heterologous origin are now used as a possible substitute of non-resorbable membranes and bone blocks for the regeneration of bone defects. This report analyzes the efficacy of these barriers, when they are inserted in a surgical slot, vestibular to the defect, using the new Bone into Bone (BiB) technique. Methods A group of 20 patients were treated with the BiB technique, and 32 implants were placed. Bone samples were collected with trephine burs 8 months after surgery and submitted to histological and histomorphometric analysis. The linear horizontal and vertical changes between pre-operative and post-operative radiographs were measured on the CT Scan. Results A mean width gain of 2.36 ± 0. 0.69 mm and a mean height gain of 3.13 ± 0.90 mm was recorded. The biomaterial was almost completely resorbed, and it accounted for 7.39% ± 7.70 of the samples. Conclusion Comparing the current results with those of other investigations, the BiB technique is an efficient alternative to other regenerative approaches, as it provides several advantages, both in terms of reduced morbidity and ease of the procedure. More reports are needed to evaluate the stability of the regenerated bone and to directly compare this technique to other, more commonly used, regenerative procedures.
{"title":"Alveolar ridge augmentation with the Bone Into Bone technique: a histological and histomorphometric analysis","authors":"M. Lopez, P. Passarelli, E. Rella, A. Netti, A. Lopez, M. Casale, A. D'addona","doi":"10.23805/JO.2021.13.03.4","DOIUrl":"https://doi.org/10.23805/JO.2021.13.03.4","url":null,"abstract":"Aim Barriers made of cortical bone of heterologous origin are now used as a possible substitute of non-resorbable membranes and bone blocks for the regeneration of bone defects. This report analyzes the efficacy of these barriers, when they are inserted in a surgical slot, vestibular to the defect, using the new Bone into Bone (BiB) technique. \u0000Methods A group of 20 patients were treated with the BiB technique, and 32 implants were placed. Bone samples were collected with trephine burs 8 months after surgery and submitted to histological and histomorphometric analysis. The linear horizontal and vertical changes between pre-operative and post-operative radiographs were measured on the CT Scan. \u0000Results A mean width gain of 2.36 ± 0. 0.69 mm and a mean height gain of 3.13 ± 0.90 mm was recorded. The biomaterial was almost completely resorbed, and it accounted for 7.39% ± 7.70 of the samples. \u0000Conclusion Comparing the current results with those of other investigations, the BiB technique is an efficient alternative to other regenerative approaches, as it provides several advantages, both in terms of reduced morbidity and ease of the procedure. More reports are needed to evaluate the stability of the regenerated bone and to directly compare this technique to other, more commonly used, regenerative procedures.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85365186","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 : 2021-09-16DOI: 10.23805/JO.2021.13.03.3
E. F. Cagidiaco, D. Karafili, G. Verniani, G. Zucca, M. Ferrari
Aim The aim of the present study was to evaluate the influence of 3 adhesive systems on microleakage of direct composite restorations with proximal margins under the cement-enamel junction (CEJ) and in the enamel. Materials and methods In 30 extracted molars standardized MOD (mesio-occlusal-distal) cavities were prepared with a proximal margin located 1 mm under the cement-enamel junction and another one in the enamel, and subsequently randomly divided in 3 groups of 10 using 3 different adhesives and the same composite: Flowable (G-aenial Universal Injectable, GC) + universal adhesive (G2-Bond universal, GC) with selective-etch technique (Group 1); Flowable (G-aenial Universal Injectable, GC) + self-etch adhesive (Clearfil SE Bond 2, Kuraray) with 2-step technique (Group 2); Flowable (G-aenial Universal Injectable, GC) + total-etch adhesive (Optibond FL, Kerr) with 3-step technique (Group 3). Samples were tested for microleakage using silver nitrate and infiltration was classified in 5 levels. The differences in microleakage were statistically evaluated with significance set at P<0.05. Results In the margin located in the enamel, group 1 showed an average of 0 microleakage, group 2 an average of 0.2 and group 3 an average of 0.1. In the margin located in the dentin, group 1 showed an average score of 1.1, group 2 of 2.15 ang group 3 of 1.25. No statistically significant difference was found in the enamel. Conclusion The combination of adhesive G2-Bond universal and Optibond FL showed the highest sealing ability both in margins located in the enamel and margins located in the dentin. The adhesive interface in the enamel produced a very good seal, while the adhesive interface in the dentin showed varying degrees of microleakage in all groups.
{"title":"Microleakage of three different combinations of adhesive and composite resins","authors":"E. F. Cagidiaco, D. Karafili, G. Verniani, G. Zucca, M. Ferrari","doi":"10.23805/JO.2021.13.03.3","DOIUrl":"https://doi.org/10.23805/JO.2021.13.03.3","url":null,"abstract":"Aim The aim of the present study was to evaluate the influence of 3 adhesive systems on microleakage of direct composite restorations with proximal margins under the cement-enamel junction (CEJ) and in the enamel. \u0000Materials and methods In 30 extracted molars standardized MOD (mesio-occlusal-distal) cavities were prepared with a proximal margin located 1 mm under the cement-enamel junction and another one in the enamel, and subsequently randomly divided in 3 groups of 10 using 3 different adhesives and the same composite: Flowable (G-aenial Universal Injectable, GC) + universal adhesive (G2-Bond universal, GC) with selective-etch technique (Group 1); Flowable (G-aenial Universal Injectable, GC) + self-etch adhesive (Clearfil SE Bond 2, Kuraray) with 2-step technique (Group 2); Flowable (G-aenial Universal Injectable, GC) + total-etch adhesive (Optibond FL, Kerr) with 3-step technique (Group 3). Samples were tested for microleakage using silver nitrate and infiltration was classified in 5 levels. The differences in microleakage were statistically evaluated with significance set at P<0.05. \u0000Results In the margin located in the enamel, group 1 showed an average of 0 microleakage, group 2 an average of 0.2 and group 3 an average of 0.1. In the margin located in the dentin, group 1 showed an average score of 1.1, group 2 of 2.15 ang group 3 of 1.25. No statistically significant difference was found in the enamel. \u0000Conclusion The combination of adhesive G2-Bond universal and Optibond FL showed the highest sealing ability both in margins located in the enamel and margins located in the dentin. The adhesive interface in the enamel produced a very good seal, while the adhesive interface in the dentin showed varying degrees of microleakage in all groups.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77375593","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 : 2021-09-14DOI: 10.23805/JO.2021.13.03.2
K. Öztürk, S. Kahraman, E. Deli̇lbaşi
Aims Atrophic jaws make implant planning difficult due to the lack of bone, and this situation directs the surgeon to advanced surgical methods. Today, autogenous grafts are still the gold standard. The aim of this study was to evaluate the bone stability of horizontal bone grafts taken from the iliac crest. Materials and metods Twenty patients receiving horizontal bone grafts were included in this retrospective cohort study. All patients were treated with bone harvested from the anterior iliac crest. The measurements were made by means of a caliper. Screw heads reference point taken. Resorption rate was followed up in a total of 188 edentulous areas. Results Graft resorption rate was 34.66% (± 20.53), 32.42% (± 19.39) in the maxilla and 48.03% (± 22.34) in the mandible. It was observed that the average bone thickness increased from 2.38 mm to 7.22 mm. Conclusions The result of the present study highlight that thicker block grafts, which were applied due to the expected resorption rate, result in a higher resorption rate after recovery. Therefore, by considering soft tissue margins, the importance of harvesting a sufficient, but not excessive, amount of grafting is underscored.
{"title":"Evaluation of early bone recovery in grafted jaw with anterior iliac bone: a retrospective study","authors":"K. Öztürk, S. Kahraman, E. Deli̇lbaşi","doi":"10.23805/JO.2021.13.03.2","DOIUrl":"https://doi.org/10.23805/JO.2021.13.03.2","url":null,"abstract":"Aims Atrophic jaws make implant planning difficult due to the lack of bone, and this situation directs the surgeon to advanced surgical methods. Today, autogenous grafts are still the gold standard. The aim of this study was to evaluate the bone stability of horizontal bone grafts taken from the iliac crest. \u0000Materials and metods Twenty patients receiving horizontal bone grafts were included in this retrospective cohort study. All patients were treated with bone harvested from the anterior iliac crest. The measurements were made by means of a caliper. Screw heads reference point taken. Resorption rate was followed up in a total of 188 edentulous areas. \u0000Results Graft resorption rate was 34.66% (± 20.53), 32.42% (± 19.39) in the maxilla and 48.03% (± 22.34) in the mandible. It was observed that the average bone thickness increased from 2.38 mm to 7.22 mm. \u0000Conclusions The result of the present study highlight that thicker block grafts, which were applied due to the expected resorption rate, result in a higher resorption rate after recovery. Therefore, by considering soft tissue margins, the importance of harvesting a sufficient, but not excessive, amount of grafting is underscored.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85909464","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 : 2021-09-10DOI: 10.23805/JO.2021.13.03.1
Z. F. Zor, Y. Kılınç, E. Erkmen, A. Kurt
Aim All-on-four concept involves the use of four anterior dental implants in the edentulous jaw to overcome anatomic limitations of residual alveolar bone. The impact of implant thread design and diameter on the biomechanical performance of all-on-four concept is not yet fully understood. The purpose of this study was to investigate the biomechanical behavior of all-on-four concept with different combinations of thread designs and diameters through a three dimensional Finite Element Analysis. Materials and methods Six three-dimensional finite element models of edentulous mandible were developed. The models included the combinations of 3.5 and 4.3 mm diameter implants with active and passive thread designs. Vertical, oblique and horizontal loads were applied anterior to the end of the cantilever. Von Mises, maximum principal and minimum principal stresses were analysed. Results The results indicated a tendency towards stress reduction in Von Mises stress values of dental implants with the increase in diameter for both mesial and distal implants. In narrow implants active thread design resulted in lower Von Mises stress values than passive thread design. Active thread design demonstrated higher bone stress when compared to passive thread design. The analysis also revealed the importance of mesial implant for diminishing stresses on the distal implant and their surrounding bone under horizontal and oblique loading. Conclusion The comparison of the models suggest that use of wide implant is advantageous in the all-on-four concept. There is a biomechanical advantage in using narrow implants with active thread design in horizontally inadequate bone. The thread design was more significant in terms of increasing bone stress than implant diameter. The mesial implant influences the biomechanical behavior of the whole design, contributing to a more favorable stress distribution under horizontal and oblique loading conditions.
目的all -on- 4的概念涉及在无牙颌中使用四个前牙种植体来克服残余牙槽骨的解剖限制。种植体螺纹设计和直径对all-on-four概念生物力学性能的影响尚不完全清楚。本研究的目的是通过三维有限元分析来研究不同螺纹设计和直径组合的all- in -four概念的生物力学行为。材料与方法建立了无牙下颌骨的6个三维有限元模型。模型包括3.5和4.3 mm直径种植体的组合，采用主动和被动螺纹设计。垂直、斜向和水平荷载被施加到悬臂的前端。Von Mises分析了最大主应力和最小主应力。结果随着种植体直径的增大，种植体的Von Mises应力值均有减小的趋势。在窄种植体中，主动螺纹设计的Von Mises应力值比被动螺纹设计的低。与被动螺纹设计相比，主动螺纹设计显示出更高的骨应力。分析还揭示了在水平和斜向载荷下，近端种植体对减少远端种植体及其周围骨的应力的重要性。结论采用宽种植体进行全- 4位固定术是有优势的。在水平不充分的骨中使用窄的主动螺纹植入物具有生物力学上的优势。螺纹设计在增加骨应力方面比种植体直径更显著。中位种植体影响整个设计的生物力学行为，有助于在水平和倾斜载荷条件下更有利的应力分布。
{"title":"Evaluation of biomechanical effects of different implant thread designs and diameters on all-on-four concept","authors":"Z. F. Zor, Y. Kılınç, E. Erkmen, A. Kurt","doi":"10.23805/JO.2021.13.03.1","DOIUrl":"https://doi.org/10.23805/JO.2021.13.03.1","url":null,"abstract":"Aim All-on-four concept involves the use of four anterior dental implants in the edentulous jaw to overcome anatomic limitations of residual alveolar bone. The impact of implant thread design and diameter on the biomechanical performance of all-on-four concept is not yet fully understood. The purpose of this study was to investigate the biomechanical behavior of all-on-four concept with different combinations of thread designs and diameters through a three dimensional Finite Element Analysis. \u0000Materials and methods Six three-dimensional finite element models of edentulous mandible were developed. The models included the combinations of 3.5 and 4.3 mm diameter implants with active and passive thread designs. Vertical, oblique and horizontal loads were applied anterior to the end of the cantilever. Von Mises, maximum principal and minimum principal stresses were analysed. \u0000Results The results indicated a tendency towards stress reduction in Von Mises stress values of dental implants with the increase in diameter for both mesial and distal implants. In narrow implants active thread design resulted in lower Von Mises stress values than passive thread design. Active thread design demonstrated higher bone stress when compared to passive thread design. The analysis also revealed the importance of mesial implant for diminishing stresses on the distal implant and their surrounding bone under horizontal and oblique loading. \u0000Conclusion The comparison of the models suggest that use of wide implant is advantageous in the all-on-four concept. There is a biomechanical advantage in using narrow implants with active thread design in horizontally inadequate bone. The thread design was more significant in terms of increasing bone stress than implant diameter. The mesial implant influences the biomechanical behavior of the whole design, contributing to a more favorable stress distribution under horizontal and oblique loading conditions.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89429962","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 : 2021-07-06DOI: 10.23805/JO.2021.13.02.6
N. Yussif, K. Selim
Aim Extraction of the posterior maxillary teeth is the main cause behind maxillary sinus expansion. The aim of the present study was to examine the relationship between extraction of maxillary posterior teeth and sinus expansion in periodontitis patients. Materials and methods A preliminary cross-sectional study was conducted. Two hundred participants underwent clinical and radiographic examination using panoramic radiograph. Results Based on the data analysis of the examined sample, no statistical correlation was reported between the maxillary sinus dimensions and age, gender, periodontal condition, alveolar ridge resorption as well as the number of missing teeth. Conclusions It was concluded that extraction of maxillary posterior teeth, periodontal condition and alveolar ridge resorption could not be considered as risk factors for maxillary sinus pneumutization.
{"title":"Analysis of post-extraction consequences of posterior maxillary molars on antral sinus in periodontitis patients: A preliminary qualitative two dimensional panoramic study (Prevalence study)","authors":"N. Yussif, K. Selim","doi":"10.23805/JO.2021.13.02.6","DOIUrl":"https://doi.org/10.23805/JO.2021.13.02.6","url":null,"abstract":"Aim Extraction of the posterior maxillary teeth is the main cause behind maxillary sinus expansion. The aim of the present study was to examine the relationship between extraction of maxillary posterior teeth and sinus expansion in periodontitis patients. \u0000Materials and methods A preliminary cross-sectional study was conducted. Two hundred participants underwent clinical and radiographic examination using panoramic radiograph. \u0000Results Based on the data analysis of the examined sample, no statistical correlation was reported between the maxillary sinus dimensions and age, gender, periodontal condition, alveolar ridge resorption as well as the number of missing teeth. \u0000Conclusions It was concluded that extraction of maxillary posterior teeth, periodontal condition and alveolar ridge resorption could not be considered as risk factors for maxillary sinus pneumutization.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91241629","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 : 2021-07-06DOI: 10.23805/JO.2021.13.02.5
L. Malchiodi, F. Zotti, G. Capocasale, L. Merlino, T. Moro, M. Zanini, P. Nocini
Aim This was to assess variation of mean crestal bone loss (CBL) when two different types of ultrashort implants are placed in the upper or in the lower jaw and to evaluate differences in terms of success and survival rates. Materials and methods 99 ultrashort implants were retrospectively evaluated assessing differences at three different time-points (placement, prosthetic loading, end of follow-up) in terms of CBL in the upper and lower jaw. Correlations between CBL and diameter, platform switching, site of placement (upper or lower), type of implants, clinical crown/implant ratio and anatomical crown/implant ratio were statistically performed and success and survival rate were assessed. Results Statistically significant correlations were found between CBL and implant diameter, kind of screw and anatomical crown/implant ratio at the end of follow up. No correlation was highlighted between CBL and platform switching, and site of placement (upper or lower jaw). Survival and success rates were comparable and were found to be 96.37% in the upper jaw and 94.46% in the mandible. Conclusion CBL in ultrashort implants is an issue deserving great attention, therefore to know features and behaviours of different ultrashort implants in different quality of bone and clinical conditions represents a cut above to obtain and maintaining success in this particular kind of rehabilitation.
{"title":"Crestal bone loss in ultrashort implants: retrospective study on two different type of fixture.","authors":"L. Malchiodi, F. Zotti, G. Capocasale, L. Merlino, T. Moro, M. Zanini, P. Nocini","doi":"10.23805/JO.2021.13.02.5","DOIUrl":"https://doi.org/10.23805/JO.2021.13.02.5","url":null,"abstract":"Aim This was to assess variation of mean crestal bone loss (CBL) when two different types of ultrashort implants are placed in the upper or in the lower jaw and to evaluate differences in terms of success and survival rates. \u0000Materials and methods 99 ultrashort implants were retrospectively evaluated assessing differences at three different time-points (placement, prosthetic loading, end of follow-up) in terms of CBL in the upper and lower jaw. Correlations between CBL and diameter, platform switching, site of placement (upper or lower), type of implants, clinical crown/implant ratio and anatomical crown/implant ratio were statistically performed and success and survival rate were assessed. \u0000Results Statistically significant correlations were found between CBL and implant diameter, kind of screw and anatomical crown/implant ratio at the end of follow up. No correlation was highlighted between CBL and platform switching, and site of placement (upper or lower jaw). Survival and success rates were comparable and were found to be 96.37% in the upper jaw and 94.46% in the mandible. \u0000Conclusion CBL in ultrashort implants is an issue deserving great attention, therefore to know features and behaviours of different ultrashort implants in different quality of bone and clinical conditions represents a cut above to obtain and maintaining success in this particular kind of rehabilitation.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90269243","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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