The aim of this study was to assess the incidence of two root canals in the mesial root of the extracted permanent maxillary first molars of a Sulaimani population. An ex vivo study on 180 extracted permanent maxillary first molars was conducted. The teeth were examined clinically and radiographically. The results showed that 23.3 % of the examined teeth had two canals in the mesial root (17.0 % with one apical foramen and 6.3 % with two separate foramens)
{"title":"The Incidence of Two Root Canals in the Mesial Root of the Extracted Permanent Maxillary First Molars Among a Sulaimani-Iraq Population (Ex Vivo Study)","authors":"Bestoon M. Faraj","doi":"10.25130/tjds.2.2.4","DOIUrl":"https://doi.org/10.25130/tjds.2.2.4","url":null,"abstract":"The aim of this study was to assess the incidence of two root canals in the mesial root of the extracted permanent maxillary first molars of a Sulaimani population. An ex vivo study on 180 extracted permanent maxillary first molars was conducted. The teeth were examined clinically and radiographically. The results showed that 23.3 % of the examined teeth had two canals in the mesial root (17.0 % with one apical foramen and 6.3 % with two separate foramens)","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"3 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139523885","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}
This study concerns with the incidence of dry sockets among a sample of patients attending different dental clinics after tooth extraction for three consecutive years in relation to their age, sex, tooth location and to patients perceived stress.Dry socket patients records were investigated for age, sex and tooth location. And a control group was chosen of exactly the same age and sex distribution as that of the patients but free from any symptoms . A questionnaire sheet with a list of possible life events for the last twelve months before the extractions were distributed among both, then the results was subjected to statistical analysis.Out of 956 patients, 58 (6%) developed dry sockets, (36%) of them were located on wisdom teeth with the lower ones comprising (25.86%). There were significant difference in mean perceived psychological stress between the patients (477.07 ± 7.38 L.C.U) and those in control group (240.44 ± 7.12 L.C.U.) regarding different ages and sexes.There were higher incidence of dry sockets in this study than most other studies around the world and female /male ratio was nearly equal. They occurred mostly on lower and posterior more than upper and anterior teeth wisdom teeth were most, highly affected, and there were a relationship between psychological stress and dry socket.
{"title":"Incidence of Dry Socket in Relation to Psychological Stress: A Retrospective Study","authors":"Munir Y. Al-Kotany","doi":"10.25130/tjds.2.2.12","DOIUrl":"https://doi.org/10.25130/tjds.2.2.12","url":null,"abstract":"This study concerns with the incidence of dry sockets among a sample of patients attending different dental clinics after tooth extraction for three consecutive years in relation to their age, sex, tooth location and to patients perceived stress.Dry socket patients records were investigated for age, sex and tooth location. And a control group was chosen of exactly the same age and sex distribution as that of the patients but free from any symptoms . A questionnaire sheet with a list of possible life events for the last twelve months before the extractions were distributed among both, then the results was subjected to statistical analysis.Out of 956 patients, 58 (6%) developed dry sockets, (36%) of them were located on wisdom teeth with the lower ones comprising (25.86%). There were significant difference in mean perceived psychological stress between the patients (477.07 ± 7.38 L.C.U) and those in control group (240.44 ± 7.12 L.C.U.) regarding different ages and sexes.There were higher incidence of dry sockets in this study than most other studies around the world and female /male ratio was nearly equal. They occurred mostly on lower and posterior more than upper and anterior teeth wisdom teeth were most, highly affected, and there were a relationship between psychological stress and dry socket.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139523936","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}
Root and crown resorption is a physiologic event for the primary teeth. It is still unclear whether odontoclasts, the cells which resorb the dental har d tissue, are different from the osteoclasts, the cells that resorb bone. Dental tissue resorption seems to be initiated and regulated by the stellate reticulum and the dental follicle of the underlying permanent tooth via the secretion of stimulatory molecules, i.e. cytokines and transcription factors. The primary teeth resorption process is regulated in a manner similar to bone remodeling, involving the same receptor ligand system known as RANK/RANKL (receptor activator of nuclear factor-kappa B/ RANK Ligand), which represent two cytokine-like proteins of the tumor necrosis factor superfamily, are localized on bone cells and dental cells .They are crucial for the regulation of osteoclastic/odontoclast cell differentiation and also for the upregulation of mature osteoclasts/odontoclasts mediated by cell-to-cell contact and a subsequent cascade of diverse intracellular signaling processes .The aim of the present study was to localize and compare the IHC rea ctions for RANKL along root surface and the crown of human phs iological resorbed primary teeth. Fifteen human upper deciduous (second molar) teeth ,undergoing root and crown resorption wer e used for immunohistochemical study to identify RANKL expre ssion. The results demonstrated a high mean of expression of R ANKL in root as compared with crown in human primary shedding teeth. The present study concludes that RANKL play a role in res orption process of the primary teeth.
{"title":"A Comparative Study for Localization of Odontoclast in Crown and Root of Physiological Resorbed Primary Teeth","authors":"Rafea M. Al-Gburi","doi":"10.25130/tjds.2.2.2","DOIUrl":"https://doi.org/10.25130/tjds.2.2.2","url":null,"abstract":"Root and crown resorption is a physiologic event for the primary teeth. It is still unclear whether odontoclasts, the cells which resorb the dental har d tissue, are different from the osteoclasts, the cells that resorb bone. Dental tissue resorption seems to be initiated and regulated by the stellate reticulum and the dental follicle of the underlying permanent tooth via the secretion of stimulatory molecules, i.e. cytokines and transcription factors. The primary teeth resorption process is regulated in a manner similar to bone remodeling, involving the same receptor ligand system known as RANK/RANKL (receptor activator of nuclear factor-kappa B/ RANK Ligand), which represent two cytokine-like proteins of the tumor necrosis factor superfamily, are localized on bone cells and dental cells .They are crucial for the regulation of osteoclastic/odontoclast cell differentiation and also for the upregulation of mature osteoclasts/odontoclasts mediated by cell-to-cell contact and a subsequent cascade of diverse intracellular signaling processes .The aim of the present study was to localize and compare the IHC rea ctions for RANKL along root surface and the crown of human phs iological resorbed primary teeth. Fifteen human upper deciduous (second molar) teeth ,undergoing root and crown resorption wer e used for immunohistochemical study to identify RANKL expre ssion. The results demonstrated a high mean of expression of R ANKL in root as compared with crown in human primary shedding teeth. The present study concludes that RANKL play a role in res orption process of the primary teeth.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"18 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139523357","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}
Muthenna Sh, R. Bds, S. Salih, A. Rahman, M. M. Saleh
The objective of this st udy aimed to assess the caries-preventive potential of various CW CO2 laser parameters, and to explore the effect of the laser power density on the caries inhibition activity.Extracted human deciduous molars were irradiated with three various power dens ities, by changing the output power, the exposure time, and the spot diameter. The CO2 laser system emitted laser with 10.6µm in wavelength. All teeth were subjected to carieslike lesion form ation by 3.5 pH lactic acid for 21 days. The teeth after that were sectioned into ground cross sections and the lesion depths were measured under a polarizing microscope.CW CO2 laser preventive treatments inhibited carieslike lesion progres sion up to 82%. This effect was improved with increasing power d ensity within the limits of the examined laser parameters.
{"title":"Effects of Irradiation of Continuous Wave Carbon Dioxide Laser on Caries Resistance of Deciduous Teeth","authors":"Muthenna Sh, R. Bds, S. Salih, A. Rahman, M. M. Saleh","doi":"10.25130/tjds.2.2.3","DOIUrl":"https://doi.org/10.25130/tjds.2.2.3","url":null,"abstract":"The objective of this st udy aimed to assess the caries-preventive potential of various CW CO2 laser parameters, and to explore the effect of the laser power density on the caries inhibition activity.Extracted human deciduous molars were irradiated with three various power dens ities, by changing the output power, the exposure time, and the spot diameter. The CO2 laser system emitted laser with 10.6µm in wavelength. All teeth were subjected to carieslike lesion form ation by 3.5 pH lactic acid for 21 days. The teeth after that were sectioned into ground cross sections and the lesion depths were measured under a polarizing microscope.CW CO2 laser preventive treatments inhibited carieslike lesion progres sion up to 82%. This effect was improved with increasing power d ensity within the limits of the examined laser parameters.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"19 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139523352","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}
Saad A. Mohammad, Mohammad A. Abd-alla, Abdul-Jabbar J. Mahdi
The shape of the mandibular notch (mandibular incisure) of both sides of 100 fresh macerated and dry adult human mandibles divided between 58 males and 42 females of Iraqi origin with their age ranges (23-52) years that had been studied in order to classify the variations in the shapes of mandibular incisure.Three types were evident: type I triangular shape, type II rounded shape and type III truncated quadrilateral shape. The triangular shape mandibular notch were found in 92 (46%) sides and truncated quadrilateral shape in 40 (20%) sides, they are mainly prevalent in male, while the rounded shape was founded in 68 (34%) sides mainly prevalent in female.Minor differences appeared on both sides founded in 28 sides but keep the general shape. The incidence of the rounded types was almost in female mandible while triangular &truncated shapes were faced mainly in the male mandibles.
{"title":"Mandibular Notch Configuration in Iraqi Adults","authors":"Saad A. Mohammad, Mohammad A. Abd-alla, Abdul-Jabbar J. Mahdi","doi":"10.25130/tjds.2.2.14","DOIUrl":"https://doi.org/10.25130/tjds.2.2.14","url":null,"abstract":"The shape of the mandibular notch (mandibular incisure) of both sides of 100 fresh macerated and dry adult human mandibles divided between 58 males and 42 females of Iraqi origin with their age ranges (23-52) years that had been studied in order to classify the variations in the shapes of mandibular incisure.Three types were evident: type I triangular shape, type II rounded shape and type III truncated quadrilateral shape. The triangular shape mandibular notch were found in 92 (46%) sides and truncated quadrilateral shape in 40 (20%) sides, they are mainly prevalent in male, while the rounded shape was founded in 68 (34%) sides mainly prevalent in female.Minor differences appeared on both sides founded in 28 sides but keep the general shape. The incidence of the rounded types was almost in female mandible while triangular &truncated shapes were faced mainly in the male mandibles.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"6 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139523663","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}
Shakhawan M. Ali, Falah A. Hawramy, Kawa A. Mahmood
The relation of maxillary posterior teeth roots to the maxillary sinus floor is important for diagnosing and planning of many surgical procedures. In order to determine of this relation two imaging technique were used in this study.Paired panoramic radiographs and computed tomography images of maxilla from 27 subjects were taken and analyzed in the teaching hospitals of Sulaimani city during the period from Jan to Aug 2009. For both imaging modalities a total of 146 maxillary teeth were grouped according to their topographic relationship to the inferior border of the maxillary sinus followed Kwak et al. classification, were 0 indicated no contact between the root and inferior border of the maxillary sinus); 1 indicated that the root is in contact with the inferior border of the maxillary sinus; 2 indicated that the root is projecting laterally on the maxillary sinus cavity but its apex is outside the sinus boundaries; 3 and 4 indicated that the teeth roots that projected on the maxillary sinus cavity. Then roots were measured according to their projection lengths in the sinus cavity.Results of this study show that there was a high correlation between the two imaging technique for classification 0 and 1 relations. The OPG showed statistically significant (P>0.001) longer root projection in the sinus cavity in comparison with the root protrusion into the sinus measured by using CT images.As conclusion; for the majority of the roots projecting on the sinus cavity in panoramic radiographs, no vertical protrusion into the sinus was observed in CT images. Roots protrude into the sinus in the CT showed shorter projection length in comparison with panoramic radiography. Panoramic radiographs can provide adequate assessment about relation of the maxillary sinus floor. CT is indicated to provide the information about the relation to the maxillary sinus floor when there is protrusion detected in panoramic images.
{"title":"The Relation of Maxillary Posterior Teeth Roots to the Maxillary Sinus Floor Using Panoramic and Computed Tomography Imaging in a Sample of Kurdish People","authors":"Shakhawan M. Ali, Falah A. Hawramy, Kawa A. Mahmood","doi":"10.25130/tjds.2.1.14","DOIUrl":"https://doi.org/10.25130/tjds.2.1.14","url":null,"abstract":"The relation of maxillary posterior teeth roots to the maxillary sinus floor is important for diagnosing and planning of many surgical procedures. In order to determine of this relation two imaging technique were used in this study.Paired panoramic radiographs and computed tomography images of maxilla from 27 subjects were taken and analyzed in the teaching hospitals of Sulaimani city during the period from Jan to Aug 2009. For both imaging modalities a total of 146 maxillary teeth were grouped according to their topographic relationship to the inferior border of the maxillary sinus followed Kwak et al. classification, were 0 indicated no contact between the root and inferior border of the maxillary sinus); 1 indicated that the root is in contact with the inferior border of the maxillary sinus; 2 indicated that the root is projecting laterally on the maxillary sinus cavity but its apex is outside the sinus boundaries; 3 and 4 indicated that the teeth roots that projected on the maxillary sinus cavity. Then roots were measured according to their projection lengths in the sinus cavity.Results of this study show that there was a high correlation between the two imaging technique for classification 0 and 1 relations. The OPG showed statistically significant (P>0.001) longer root projection in the sinus cavity in comparison with the root protrusion into the sinus measured by using CT images.As conclusion; for the majority of the roots projecting on the sinus cavity in panoramic radiographs, no vertical protrusion into the sinus was observed in CT images. Roots protrude into the sinus in the CT showed shorter projection length in comparison with panoramic radiography. Panoramic radiographs can provide adequate assessment about relation of the maxillary sinus floor. CT is indicated to provide the information about the relation to the maxillary sinus floor when there is protrusion detected in panoramic images.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"8 33","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139523797","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}
Emad F. AL-Khalidi عماد فرحان الخالدي, Sabah A. Ismail صباح عبد الوهاب اسماعيل, Mohammed M. Obosi محمد منذر العبوسي
This study was conducted to investigate the sealing ability (microleakage) of new composite restorative materials at tooth/composite interface.Thirty non carious, extracted human premolars teeth were mounted in acrylic resin, the teeth were randomly divided into three groups (n=10) according to the type of composite (tetric T-Econom, Evo ceram,IPS Empress). A standardize class V (5×3×2) mm dimensions cavity was prepared on the facial surface of each tooth (each group with corresponding bur type). After the specimens were filled with three types of composite restoration. They stored for one month in 37ºc distilled water, thermo cycled for 500 cycles between (5ºc & 55ºc) and immersed in 2% methylene blue solution for 24h., and then sectioned longitudinally. For both occlusal and gingival margins, dye penetration at the tooth/composite interfaces were scored from 0-3 under stereomicroscope at a magnification x10. Data were analyzed using unpaired T-test, ANOVA, and Duncan’s multiple rang test at 5% significant level.Kruskal-wallis test show that there was a significant difference in microleakage between the three types of composite it represent that there was less microleakage in group filled with IPS Empress while tetric T-Econom show the highest leakage.There was no significant difference in microleakage between IPS Empress and Evo ceram composite filling.AS Conclusions; Within the limitations of this in vitro study the results show that there was less microleakage in the cavities filled with IPS Empress composite and EVO ceram composite as compared with Tetric T-Econom composite.
{"title":"Evaluation of Sealing Ability of New Composite Filling Material","authors":"Emad F. AL-Khalidi عماد فرحان الخالدي, Sabah A. Ismail صباح عبد الوهاب اسماعيل, Mohammed M. Obosi محمد منذر العبوسي","doi":"10.25130/tjds.2.1.6","DOIUrl":"https://doi.org/10.25130/tjds.2.1.6","url":null,"abstract":"This study was conducted to investigate the sealing ability (microleakage) of new composite restorative materials at tooth/composite interface.Thirty non carious, extracted human premolars teeth were mounted in acrylic resin, the teeth were randomly divided into three groups (n=10) according to the type of composite (tetric T-Econom, Evo ceram,IPS Empress). A standardize class V (5×3×2) mm dimensions cavity was prepared on the facial surface of each tooth (each group with corresponding bur type). After the specimens were filled with three types of composite restoration. They stored for one month in 37ºc distilled water, thermo cycled for 500 cycles between (5ºc & 55ºc) and immersed in 2% methylene blue solution for 24h., and then sectioned longitudinally. For both occlusal and gingival margins, dye penetration at the tooth/composite interfaces were scored from 0-3 under stereomicroscope at a magnification x10. Data were analyzed using unpaired T-test, ANOVA, and Duncan’s multiple rang test at 5% significant level.Kruskal-wallis test show that there was a significant difference in microleakage between the three types of composite it represent that there was less microleakage in group filled with IPS Empress while tetric T-Econom show the highest leakage.There was no significant difference in microleakage between IPS Empress and Evo ceram composite filling.AS Conclusions; Within the limitations of this in vitro study the results show that there was less microleakage in the cavities filled with IPS Empress composite and EVO ceram composite as compared with Tetric T-Econom composite.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139523970","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}
Mohammed K. Hilal, Mohammed Y.Shareef, Maher K. Ali, R. Van Noort
The aim of this study is to investigate the effect of addition of ZrO2 on the biaxial flexural strength (BFS) of ceramics fabricated using a conventional powder technology. Various compositions of hydroxyapatite (HAp) Ca10(PO4)6(OH)2 and zirconia powder ZrO2, ranging from 10 to 90 wt% ZrO2, were prepared using a wet mixing process. Ten compacts (13.5mm3mm) were made for each group, pressed and sintered in air at sintering temperatures from 1100 to 1450oC for up to 12 hours. The bulk density, porosity, linear shrinkage and BFS. The porosity reduced and linear shrinkage increased with increasing sintering temperature and amounts of zirconia, whereas the sintering time had little effect. The highest mean value achieved for the BFS was 26920 MPa for a composition of 70% ZrO2 and 30% HAp fired at 1450oCfor 6 hours. From the experimental results can be conclude that sintering temperature and composition affect densification behaviour of calcium phosphate/ ZrO2 composites. The BFS increases with a reduction of porosity and increases with both sintering temperature and additions of ZrO2. It was noted that there is considerable scope for improvement in the BFS values by reducing the porosity of these composites.
{"title":"Effect of Addition of ZrO2 on Biaxial Flexural Strength of Calcium Phosphate Ceramics","authors":"Mohammed K. Hilal, Mohammed Y.Shareef, Maher K. Ali, R. Van Noort","doi":"10.25130/tjds.2013.1.6","DOIUrl":"https://doi.org/10.25130/tjds.2013.1.6","url":null,"abstract":"The aim of this study is to investigate the effect of addition of ZrO2 on the biaxial flexural strength (BFS) of ceramics fabricated using a conventional powder technology. Various compositions of hydroxyapatite (HAp) Ca10(PO4)6(OH)2 and zirconia powder ZrO2, ranging from 10 to 90 wt% ZrO2, were prepared using a wet mixing process. Ten compacts (13.5mm3mm) were made for each group, pressed and sintered in air at sintering temperatures from 1100 to 1450oC for up to 12 hours. The bulk density, porosity, linear shrinkage and BFS. The porosity reduced and linear shrinkage increased with increasing sintering temperature and amounts of zirconia, whereas the sintering time had little effect. The highest mean value achieved for the BFS was 26920 MPa for a composition of 70% ZrO2 and 30% HAp fired at 1450oCfor 6 hours. From the experimental results can be conclude that sintering temperature and composition affect densification behaviour of calcium phosphate/ ZrO2 composites. The BFS increases with a reduction of porosity and increases with both sintering temperature and additions of ZrO2. It was noted that there is considerable scope for improvement in the BFS values by reducing the porosity of these composites.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"5 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139524068","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}
The study performed were to measured the amount of shrinkage deformation of resin composites with and without bonding agent. The shrinkage defor mation of three types of composite resin (Ecusphere, Densply, CHARISMA) in cavities was studied using image correlation method. The cylindrical cavity in extracted teeth ( premolors) are to examine the shrinkage behavior on the top free surface. The cavities filled with resin after spreading a bonding agent are irradiated using LED unit, also performed on the cavities without bonding agent. One way analysis of variance and MOIRE analysis were used for statistical analysis. The shrinkage behavior was different in the cavities prepared with and without bonding agent. Polymerization of dental composites is characterized by heterogeneous deformation patterns with variable shrinkage values at different locations within the material.
研究旨在测量含粘接剂和不含粘接剂的树脂复合材料的收缩变形量。使用图像相关法研究了三种复合树脂（Ecusphere、Densply、CHARISMA）在龋洞中的收缩变形。在拔牙（前色）的圆柱形龋洞中检查顶部自由表面的收缩行为。对涂抹粘接剂后填充了树脂的龋洞使用 LED 进行照射，同时也对未涂抹粘接剂的龋洞进行照射。统计分析采用了单向方差分析和 MOIRE 分析法。结果表明，使用粘接剂和不使用粘接剂的牙洞收缩情况不同。牙科复合材料聚合的特点是异质变形模式，材料内部不同位置的收缩值各不相同。
{"title":"Shrinkage Deformation of Three Different Light Cure Composite Resin Using Image Correlation Method","authors":"Fanar T. Abdul Hammed","doi":"10.25130/tjds.2013.1.7","DOIUrl":"https://doi.org/10.25130/tjds.2013.1.7","url":null,"abstract":"The study performed were to measured the amount of shrinkage deformation of resin composites with and without bonding agent. The shrinkage defor mation of three types of composite resin (Ecusphere, Densply, CHARISMA) in cavities was studied using image correlation method. The cylindrical cavity in extracted teeth ( premolors) are to examine the shrinkage behavior on the top free surface. The cavities filled with resin after spreading a bonding agent are irradiated using LED unit, also performed on the cavities without bonding agent. One way analysis of variance and MOIRE analysis were used for statistical analysis. The shrinkage behavior was different in the cavities prepared with and without bonding agent. Polymerization of dental composites is characterized by heterogeneous deformation patterns with variable shrinkage values at different locations within the material.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139524295","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}
The aim of this in vitro study was to compare three dimensionally the density and homogeneity of cold lateral compaction, warm vertical compacti on and guttaflow root canal obturation techniques using computed tomography. Thirty canals of 12 mm from extracted lower single canal premolars were selected then instrumented and divided randomly into 3 groups with 10 roots in each group. Group I was obturation with cold lateral compaction technique, group II was obturated with warm vertical compaction technique and group III was obturated with guttaflow system. The specimens were then analyzed for the density and homogeneity in both vertical and hor i zontalsections in apical, middle and coronal third with 1 mm section thickness using computed tomography. The data obtained in hounsefield units were subjected to statistical analysis. In conclusionguttaflow was superior in the apical part and none of the tested obturation techniques can achieve three dimensional dense and homogenous obturation from apical to coronal parts of root.
{"title":"Evaluation of Density and Homogeneity of Three Different Root Canal Obturation Techniques: A Three –Dimensional Computed Tomography In Vitro Study","authors":"A. Mustafa","doi":"10.25130/tjds.2013.1.3","DOIUrl":"https://doi.org/10.25130/tjds.2013.1.3","url":null,"abstract":"The aim of this in vitro study was to compare three dimensionally the density and homogeneity of cold lateral compaction, warm vertical compacti on and guttaflow root canal obturation techniques using computed tomography. Thirty canals of 12 mm from extracted lower single canal premolars were selected then instrumented and divided randomly into 3 groups with 10 roots in each group. Group I was obturation with cold lateral compaction technique, group II was obturated with warm vertical compaction technique and group III was obturated with guttaflow system. The specimens were then analyzed for the density and homogeneity in both vertical and hor i zontalsections in apical, middle and coronal third with 1 mm section thickness using computed tomography. The data obtained in hounsefield units were subjected to statistical analysis. In conclusionguttaflow was superior in the apical part and none of the tested obturation techniques can achieve three dimensional dense and homogenous obturation from apical to coronal parts of root.","PeriodicalId":512116,"journal":{"name":"Tikrit Journal for Dental Sciences","volume":"3 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139524710","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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