Journal of dentistry (Shiraz, Iran)最新文献

{"title":"Evaluation of the Effect of Hyaluronic Acid Injection on the Reconstruction of Reduced Interdental Papillae in Patients Referred to Shiraz School of Dentistry.","authors":"Reihaneh Ebrahimi,&nbsp;Hooman Khorshidi,&nbsp;Rabieh Boroumand,&nbsp;Ali Azadikhah,&nbsp;Pardis Haddadi,&nbsp;Dmd MScD","doi":"10.30476/dentjods.2022.94766.1808","DOIUrl":"https://doi.org/10.30476/dentjods.2022.94766.1808","url":null,"abstract":"<p><strong>Statement of the problem: </strong>The occurrence of papillary defects adjacent to teeth or dental implants causes both the dental staff and the patients to be concerned about the esthetic issues. Interdental papilla reconstruction surgery is one of the most difficult and unpredictable mucogingival surgeries.</p><p><strong>Purpose: </strong>The present study aimed to investigate the efficacy of hyaluronic acid injection in the reconstruction of the interdental papilla.</p><p><strong>Materials and method: </strong>This clinical trial study was conducted on four patients with 20 deficient interdental papillae who met the inclusion criteria. At first, local anesthesia was applied. Afterward, 0.2 mL of 1.6% hyaluronic acid (HA) gel was injected (at the tip of the papilla and 2-3 mm below the tip of the papilla) three times every two weeks. At baseline, three, and six months later, clinical photography was taken under standard conditions. The papilla height (the distance between the interdental papilla tip and the basis), black triangle area, and the distance between the interdental papilla tip and contact point of adjacent teeth were all measured using Image J software.</p><p><strong>Results: </strong>The effectiveness of using HA gel in reducing the black triangle area was 85.06%. Furthermore, the papilla length increased by 70.256% while contact to papilla distance decreased by 83.026%. At different times, the values of the studied variables in the three levels were significantly different (<i>p</i>< 0.05).</p><p><strong>Conclusion: </strong>Injection of HA with 1.6% concentration at two points of the interdental papilla was effective in interdental papilla reconstruction at the aesthetic zone, especially in long-term, follow-ups (especially 6 months).</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 3","pages":"305-311"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10506141/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41179699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Root Dilaceration in Permanent Anterior and Canine Teeth in the Southern Subpopulation of Iran Using Cone-Beam Computed Tomography.","authors":"Safoora Sahebi, Alireza Razavian, Neshat Maddahi, Bahar Asheghi, Maryam Zangooei Booshehri","doi":"10.30476/dentjods.2022.95451.1874","DOIUrl":"10.30476/dentjods.2022.95451.1874","url":null,"abstract":"<p><strong>Statement of the problem: </strong>Developmental anomalies such as dilacerations can affect the eruption pattern of permanent anterior teeth. They are characterized by a curvature in the crown and roots of the teeth relative to their normal axis. This anomaly can cause some complexities in routine dental treatments such as root canal treatment, orthodontics, and surgery.</p><p><strong>Purpose: </strong>The purpose of this study was to assess the prevalence of dilaceration in maxillary and mandibular anterior and canine teeth in Shiraz, Iran using cone-beam computed tomography (CBCT).</p><p><strong>Materials and method: </strong>In this retrospective study, a total of 1537 encompassed 400 CBCT images collected from 4 private radiology clinics in Shiraz were assessed. Each tooth was radiographically examined in order to diagnose root dilacerations considering their location (apical, middle, coronal), position in the jaw (maxillary or mandibular), direction (mesial, distal buccal and palatal/lingual), and severity of dilaceration (mild, moderate, and severe). The obtained data were analyzed by Chi-square statistical test and Fisher's exact test.</p><p><strong>Results: </strong>In this study, out of 1537 studied teeth, 5.98% had dilaceration. The maxillary and mandibular canine teeth (9.8% and 9.7%, respectively) were significantly the most common teeth involved in this anomaly (<i>p</i>< 0.001). The distal direction with mild severity in the apical third of the root was also the most common result obtained from this study (p<0.001). In addition, there was no statistically significant relationship between gender and type of jaw regarding the prevalence of dilaceration in the studied dental groups (p=0.670 and p=0.231, respectively).</p><p><strong>Conclusion: </strong>In the current research, it was demonstrated through CBCT records that the prevalence of dilaceration in maxillary and mandibular anterior and canine teeth is relatively uncommon. The most prevalent dilaceration was found to be distal direction with mild severity in the apical third of the root.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 3","pages":"320-327"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10506143/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41164358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of the Shear Bond Strength of Orthodontic Composites Containing Silver and Amorphous Tricalcium Phosphate Nanoparticles: an <i>ex vivo</i> Study.","authors":"Zahra Tavakolinejad,&nbsp;Yasaman Mohammadi Kamalabadi,&nbsp;Arman Salehi","doi":"10.30476/dentjods.2022.94075.1760","DOIUrl":"https://doi.org/10.30476/dentjods.2022.94075.1760","url":null,"abstract":"<p><strong>Statement of the problem: </strong>It is important to use orthodontic composites with favorable properties, which are easily removed after the end of the treatment but not easily debonded during treatment. Nanoparticles have drawn attention for their antibacterial properties when added to composite resins. However, the effect of addition of nanoparticle on shear bond strength is not broadly discussed.</p><p><strong>Purpose: </strong>The present study was designed to compare the shear bond strength of orthodontic brackets bonded by orthodontic composite containing silver nanoparticles with orthodontic composite containing amorphous tricalcium phosphate nanoparticles.</p><p><strong>Materials and method: </strong>In this <i>ex vivo</i> study, 36 sound extracted human premolars were used and randomly divided into three groups. The brackets were bonded in the first group by composite without nanoparticles, in the second group by composite containing 3% amorphous tricalcium phosphate nanoparticles and in the third group by composite containing 0.3% silver nanoparticles at the buccal surface of the teeth. The shear bond strengths of the samples were measured 24 hours after preparation by a universal testing machine. Data were analyzed using SPSS 21 software through one-way ANOVA and Tamhane's T2 multiple comparison tests. <i>p</i>Values under 0.05 were considered significant.</p><p><strong>Results: </strong>There was no significant difference between the mean shear bond strength of composite containing amorphous tricalcium phosphate nanoparticles with composite without nanoparticles (<i>p</i>= 0.142). However, the mean shear bond strength in the composite containing silver nanoparticles was significantly lower than the other two groups (<i>p</i>< 0.001).</p><p><strong>Conclusion: </strong>According to the results of this study, the addition of amorphous tricalcium phosphate nanoparticles to orthodontic composite does not significantly decrease the shear bond strength while silver nanoparticles reduce the shear bond strength of orthodontic composite.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 3","pages":"285-292"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10506151/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41153962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Salivary Vascular Endothelial Growth Factor and Epidermal Growth Factor Levels in Patients with Recurrent Aphthous Stomatitis: a Meta-Analysis.","authors":"Paria Motahari,&nbsp;Davood Fathollahzadeh,&nbsp;Amir Alipour","doi":"10.30476/dentjods.2022.94772.1809","DOIUrl":"https://doi.org/10.30476/dentjods.2022.94772.1809","url":null,"abstract":"<p><p>Recurrent aphthous stomatitis (RAS) has been identified as a common oral lesion with an unknown pathogenesis. Various studies have been conducted to show the important role of two factors named epidermal growth factor (EGF) and vascular endothelial growth factor (VEGF) in RAS, but certain results have not been achieved. The present meta-analysis was conducted to evaluate the salivary levels of EGF and VEGF in patients with RAS. For this purpose, the related articles in the Web of Science, PubMed, Embase, ProQuest and Scopus databases until January 2022 were searched and their abstracts were studied. Google scholar and scientific information database were also searched for articles in Persian. The searches were completed by the medical subject heading terms considering \"recurrent aphthous stomatitis\" and \"saliva\" in combination with \"EGF\" or \"VEGF\" keywords. All case control studies that evaluated the salivary levels of EGF and VEGF in patients with RAS were included in this study. To evaluate statistical heterogeneity between the studies, Cochrane Q and I² tests were adopted. The extracted data then were used in the analysis process based on comprehensive meta-analysis software. Originally, 619 articles were considered, of which 7 articles were selected. According to this meta-analysis, salivary EGF and VEGF levels were significantly lower in the active and remission period of RAS than in healthy individuals (<i>p</i>Value< 0.05). In addition, salivary levels of these factors were significantly lower in the active stage of RAS than in the healing phase. This review study suggests that decreasing of salivary EGF and VEGF levels have significant role in the development of RAS.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 3","pages":"277-284"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10506145/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41164965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Low-Temperature Degradation, Ph-Cycling and Simulated Tooth Brushing on Surface Roughness, Topography, and Polish Retention of Yttrium-Stabilized Tetragonal Zirconia.","authors":"Foroogh Fadavi,&nbsp;Mahshid Mohammadi-Bassir,&nbsp;Nioosha Sarabi,&nbsp;Mohammad Bagher Rezvani,&nbsp;Siavash Jafari-Semnani,&nbsp;Maryam Rastegar Moghaddam,&nbsp;Hossein Labbaf","doi":"10.30476/dentjods.2022.93896.1744","DOIUrl":"https://doi.org/10.30476/dentjods.2022.93896.1744","url":null,"abstract":"<p><strong>Statement of the problem: </strong>Surface roughness of zirconia is an important parameter that determines the success of zirconia restorations. When zirconia surfaces are left rough, higher susceptibility to hydrothermal aging, plaque accumulation and color changes would occur. Therefore, polish retention of these restorations is considered as a challenge.</p><p><strong>Purpose: </strong>The purpose of this <i>in vitro</i> study was to determine the effect of hydrothermal degradation, pH- cycling, and simulated tooth brushing on surface roughness, topography, and polish retention of an yttrium-stabilized monolithic zirconia.</p><p><strong>Materials and method: </strong>In this experimental study, 64 specimens of yttria-stabilized tetragonal zirconium oxide (20×4×2mm) were prepared (ZirKonzahn, Steger, Ahrntal). The specimens were wet- polished (standard polishing), and divided into 8 groups (n=8). Four control groups were assessed in non-aged condition while in 4 experimental groups the artificially ageing was done. Different finishing and polishing procedures were performed in 8 groups. The surface roughness values including mean surface roughness (Ra) and mean height of surface roughness (Rz) was measured by a profilometer. The results were analyzed using two-way ANOVA and Tukey's HSD test (α=0.05). One representative specimen of each group was inspected under a scanning electron microscope (SEM) for assessment of surface topography.</p><p><strong>Results: </strong>The effects of surface treatments on Ra (<i>p</i><.001) and Rz (<i>p</i><.001) parameters were significant. Ageing had no significant effect on Ra (<i>p</i>=.086) and Rz (<i>p</i>=.067) values. Maximum Ra and Rz parameters were recorded following grinding (<i>p</i><.001) and minimum values were recorded after glazing, which were significantly lower than the values in grinding group (<i>p</i><.001). Polishing and glazing diminished the surface roughness (Ra) of ground zirconia similarly (<i>p</i>=.995).</p><p><strong>Conclusion: </strong>Aging had no significant effect on surface roughness of zirconia, irrespective of surface treatment type. Grinding yielded maximum surface roughness. Intra oral polishing yielded a surface roughness comparable to standard polishing and glazing.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 3","pages":"293-304"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10506144/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41165079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Evaluation of the Effect of Two Platelet Concentrates (a-PRF and L-PRF) on the Cellular Activity of Pre-osteoblastic MG-63 Cell Line: An in vitro Study.","authors":"Azadeh Esmaeilnejad,&nbsp;Mohammadreza Talebi Ardakani,&nbsp;Mahdi Shokri,&nbsp;PhD Nima Hosseini Khou,&nbsp;Mobina Kamani","doi":"10.30476/dentjods.2022.93305.1709","DOIUrl":"https://doi.org/10.30476/dentjods.2022.93305.1709","url":null,"abstract":"<p><strong>Statement of the problem: </strong>Currently, the reconstruction of bone defects with new platelet concentrates is considered a significant challenge in periodontics.</p><p><strong>Purpose: </strong>This study aimed to evaluate advanced- platelet rich fibrin (A-PRF) and leukocyte- and platelet rich fibrin's (L-PRF) effects on the proliferation and differentiation of MG-63 cells.</p><p><strong>Materials and method: </strong>In this <i>in vitro</i> study, blood samples of five healthy non-smoking volunteers were collected and immediately centrifuged according to the two protocols of Choukroun and Ghanaati, without adding any anticoagulants, to prepare L-PRF and A-PRF. After freezing the clots for one hour, they were crushed and centrifuged once more. After culturing MG-63 cells, the effects of 20%, 10%, 1%, and 0.5% concentrations of A-PRF and L-PRF extracts on cell proliferation and mineralization were evaluated by methyl thiazolyl tetrazolium (MTT) assay and Alizarin Red staining, respectively.</p><p><strong>Results: </strong>Generally, survival and proliferation in the L-PRF group at both time intervals were higher than the A-PRF group and increased with increasing the extract concentration. However, in the A-PRF group, there were no significant differences between the different concentrations, and only the number of cells increased over time. After three days, in the study on mineralization, nodule formation was observed only in the positive control group (osteogenic). In seven days, mineralized nodules were formed in all groups with different concentrations of A-PRF, but not in any of the L-PRF groups.</p><p><strong>Conclusion: </strong>According to the results, L-PRF increased proliferation, and A-PRF exerted a positive effect on the differentiation of MG-63 cells.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 2","pages":"235-244"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10300147/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9793623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antimicrobial Effect of Nano-Calcium Hydroxide on the Four- and Six-Week-Old Intra-Canal <i>Enterococcus Faecalis</i> Biofilm.","authors":"Mohammad Frough Reyhani,&nbsp;Negin Ghasemi,&nbsp;Amin Salem Milani,&nbsp;Masoumeh Abbasi Asl","doi":"10.30476/dentjods.2022.94792.1812","DOIUrl":"https://doi.org/10.30476/dentjods.2022.94792.1812","url":null,"abstract":"<p><strong>Statement of the problem: </strong><i>Enterococcus faecalis</i> (<i>E. faecalis</i>) is one of the most important microorganisms in the evaluation of the antibacterial effects of intra-canal medications due to its ability to penetrate dentinal tubules and form biofilms. Calcium hydroxide, as the most common intra-canal medication, has little effect on this bacterial species. In contrast, it is hypothesized that nano scale hydroxide particles are more effective due to their smaller size and higher surface-to-volume ratio.</p><p><strong>Purpose: </strong>This study aimed to investigate the antimicrobial effect of nano-calcium hydroxide on the four- and six-week-old intra-canal <i>E. faecalis</i> biofilms.</p><p><strong>Materials and method: </strong>In this <i>in vitro</i> study, seventy maxillary single-canal premolar teeth were used. After cleaning and preparing the root canals, the samples were placed in vials containing <i>E. faecalis</i> solution in which the culture medium was changed daily. Each group was divided into three subgroups (n=20) in terms of the antimicrobial material used as the intra-canal medication including subgroup 1: nano-calcium hydroxide, subgroup 2: calcium hydroxide, and subgroup 3: phosphate-buffered saline solution (control group). The antimicrobial property was measured by counting colony-forming units (CFU). The data were analyzed with Mann-Whitney U and Kruskal-Wallis tests. Statistical significance was set at <i>p</i>< 0.05.</p><p><strong>Results: </strong>The mean CFU in the six-week-old biofilm group was significantly higher than that in the four-week-old biofilm (<i>p</i>= 0.003). A comparison between the subgroups showed a significant decrease in CFU in the six-week-old biofilm in the nano-calcium hydroxide subgroup compared to that in the calcium hydroxide subgroup (<i>p</i>= 0.002). However, the decrease was not significant in the four-week-old biofilm group (<i>p</i>= 0.06).</p><p><strong>Conclusion: </strong>Under the limitations of the present study, the antimicrobial properties of nano-calcium hydroxide were higher than conventional calcium hydroxide on mature biofilm, whereas the antimicrobial properties were not clinically and significantly different on immature biofilm.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 2","pages":"194-199"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10300140/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9738857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Two Pain Assessment Methods (Tactile and Air blast) for Comparison the Effectiveness of Nd:YAG Laser Therapy and Non-Laser Therapy on Dentin Hyper Sensitivity Treatment: A Systematic Review and Meta-analysis.","authors":"Zahra Baghani,&nbsp;Malihe Karrabi","doi":"10.30476/dentjods.2022.93159.1698","DOIUrl":"https://doi.org/10.30476/dentjods.2022.93159.1698","url":null,"abstract":"<p><strong>Statement of the problem: </strong>Dentin hypersensitivity (DH) is a common irritating condition. A precise sensitive test for its assessment can greatly aid in appropriate treatment planning.</p><p><strong>Purpose: </strong>This meta-analysis aims to compare the air blast and tactile tests for assessment of the efficacy Nd:YAG laser therapy versus non-laser treatments for DH in short-term and long-term follow-ups.</p><p><strong>Materials and method: </strong>For this review, an electronic search of the literature was carried out in three databases by two researchers for English articles published until March 10, 2021. Pooling of the data extracted from the selected articles was performed according to the PRISMA statement by the random-effect model. The mean difference (MD) and 95% confidence interval (CI) of pain score before the treatment onset and during the follow-up period according to the visual analog scale (VAS) were calculated. The level of heterogeneity was assessed by the I₂ test, and a funnel plot was drawn to assess the publication bias of the reviewed studies.</p><p><strong>Results: </strong>Of 152 articles primarily retrieved, 9 randomized clinical trials (RCTs) using the air blast test and 4 RCTs using the tactile test were subjected to quantitative synthesis. In the short-term follow-up and immediately after treatment, the air blast test showed superiority of laser therapy compared with non-laser treatments (SMD: 0.55, 95% CI: 0.05-1.04, <i>p</i>= 0.03). However, this difference was not significant according to the tactile test (SMD: 0.48. 95% CI: 0.01-0.96, <i>p</i>= 0.06). In the long-term follow-up, the difference between laser therapy and non-laser modalities was not significant according to both air blast (SMD= -0.38, 95% CI: -1.43-0.67, <i>p</i>= 0.48) and tactile (SMD=0.0, 95% CI: -0.38-0.38, <i>p</i>= 0.99) tests.</p><p><strong>Conclusion: </strong>Comparison of laser therapy and non-laser modalities in the short-term reveal-ed higher sensitivity of the air blast test due to its mechanism of action compared with the tactile test. Further studies are required to interpret the results in the long-term follow-up.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 2","pages":"168-181"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10300146/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9741444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conservative Management of Unicystic Ameloblastoma of Mandible Evolving from Dentigerous Cyst in a Paediatric Patient: A Case Report.","authors":"Verma Meenal,&nbsp;Verma Nikhil,&nbsp;Astekar Madhusudan","doi":"10.30476/dentjods.2022.94689.1804","DOIUrl":"https://doi.org/10.30476/dentjods.2022.94689.1804","url":null,"abstract":"<p><p>Massive cystic lesions involving a mandible always present a diagnostic and treatment challenge. Unicystic ameloblastoma (UA) is a variant of ameloblastoma encompassing about 6% of ameloblastomas. They represent cystic lesions that reveal clinical and radiographic features of a cyst, but the histopathological features demonstrate a typical ameloblastomatous epithelium lining the cyst. It is a variant of ameloblastoma, usually having clinical and radiographic similarities with dentigerous cysts, hence posing preoperative diagnostic difficulties. Adult treatment protocol cannot be applied to the pediatric population since resection may cause an alteration in craniofacial development leading to functional and esthetical damage, which can directly affect their quality of life. A more conservative approach of enucleating the lesion seems to be a promising treatment modality of UA in the pediatric age group. We present a case of mural variant of UA arising from dentigerous cyst in an 8-year-old male patient.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 2","pages":"250-255"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10300139/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9793622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How Does the First Molar Root Location Affect the Critical Stress Pattern in the Periodontium? A Finite Element Analysis.","authors":"Zahra Baghani,&nbsp;Reza Soheilifard,&nbsp;Sahar Bayat","doi":"10.30476/dentjods.2022.93271.1704","DOIUrl":"https://doi.org/10.30476/dentjods.2022.93271.1704","url":null,"abstract":"<p><strong>Statement of the problem: </strong>The first molar root location plays a pivotal role in neutralization of forces applied to the teeth to prevent injury.</p><p><strong>Purpose: </strong>This study aimed to assess the effect of maxillary and mandibular first molar root location on biomechanical behavior of the periodontium under vertical and oblique loadings.</p><p><strong>Materials and method: </strong>In this three-dimensional (3D) finite element analysis (FEA), the maxillary and mandibular first molars and their periodontium were modeled. The Young's modulus and the Poisson's ratio for the enamel, dentin, dental pulp, periodontal ligament (PDL), and cortical and cancellous bones were adopted from previous studies. The changes in maximum von Misses stress (MVMS) values of each component were analyzed.</p><p><strong>Results: </strong>The MVMS values were the highest in the enamel followed by dentin, cortical bone, cancellous bone, and PDL. The maxillary and mandibular first molars with different root locations and their periodontium showed different biomechanical behaviors under the applied loads.</p><p><strong>Conclusion: </strong>An interesting finding was that the stress concentration point in the path of load degeneration changed from the cervical third in dentin to the apical third in the cancellous bone, which can greatly help in detection of susceptible areas over time.</p>","PeriodicalId":73702,"journal":{"name":"Journal of dentistry (Shiraz, Iran)","volume":"24 2","pages":"182-193"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10300141/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9793619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}