Marginal Accuracy of CAD/CAM Frameworks Fabricated by Presintered Cobalt-Chromium Alloy: A Systematic Review and Meta-analysis.

Purpose: To evaluate the marginal accuracy of soft-milled cobalt-chromium (Co-Cr) compared to other construction methods/restorative materials in tooth/implant-supported restorations. Materials and Methods: PICO questions were defined, and a systematic search was conducted in six electronic databases. Titles and abstracts were collected and screened by two independent reviewers. After removing duplicate articles, the full texts of relevant articles were gathered, and the required information and data were extracted. Risk of bias was assessed and meta-analyses of the collected data were conducted using STATA software version 16. Results: A total of 1,914 experimental and clinical articles were reviewed, and 18 studies were selected for qualitative analysis. The 16 studies that were included in the meta-analysis showed no significant marginal gap differences between soft-milled Co-Cr and the following methods/materials: hard-milled Co-Cr (I2 = 92.9%, P = .86), casting wax (I2 = 90.9%, P = .42), laser-sintered Co-Cr (I2 = 93.3%, P = .46), and zirconia (I2 = 0.00%, P = .47). However, a significantly higher marginal accuracy of soft-milled Co-Cr was observed when compared to milled-wax casting (I2 = 93.1%, P < .001). Conclusion: The marginal gap of soft-milled Co-Cr restorations is within the acceptable clinical range and provides an accuracy similar to other available methods/materials for both the prepared implant abutment and tooth.

Frequency distribution of temporomandibular disorders according to occlusal factors: A cross-sectional study.

BACKGROUND: Temporomandibular disorder (TMD) is a common condition affecting the temporomandibular joint and causes pain and discomfort. However, the role of factors contributing to this problem is still controversial. The purpose of this cross-sectional study was to determine the correlation of occlusal factors and parafunctional habits with TMD and The determination of TMD prevalence among patients referring to Isfahan Dental School in 2017. MATERIALS AND METHODS: In this cross-sectional study, A total of 200 patients between 20 and 50 years were examined and questioned based on the Research Diagnostic Criteria for Temporomandibular Disorders assessment instrument. The association of occlusal factors (dental relationship, lateral occlusal scheme, horizontal differences between centric occlusion and Maximum intercuspation (MI), difference between MI and mandibular resting position) and parafunctional habits (bruxism/clenching and habits) with TMD was analyzed using Chi-square tests and independent sample t-test (α = 0.05). Binomial logistic regression analysis was performed with respect to confounding variables. RESULTS: The prevalence of TMD in the studied sample was 58.9%. Only bruxism showed a significant difference between TMD and non-TMD groups (P < 0.05). Other parafunctional and occlusal factors did not act as influential factors for TMD. CONCLUSION: Parafunction may play an important role in the initiation of TMD, although other habits and occlusal factors are considered as noninfluential factors. However, larger sample size and multicenter sampling are recommended for the future studies.

Cephalometric and Anthropometric Changes and Their Relation to Patients' Satisfaction After Orthognathic Surgery.

OBJECTIVE: The aim of this prospective study was to evaluate the correlation between cephalometric and anthropometric facial changes and satisfaction level of class III patients after bimaxillary orthognathic surgery. METHODS AND MATERIALS: Totally, 29 class III patients (mean age = 24.23 ±â€Š4.2) undergoing one-piece Lefort 1 osteotomy and mandibular setback were included. Pre- and postoperative lateral cephalograms were taken. Thirteen cephalometric and 17 anthropometric facial measurements were evaluated. A 6-item questionnaire of Rustemeyer's study was used to assess patient's satisfaction after surgery. The Wilcoxon signed-rank test, paired sample t test and Spearman's correlation analysis were used as statistical analysis. RESULTS: Facial aesthetic and masticatory improvement was highly significant (P < 0.001), while opinion differences between patients and relatives/friends were not significant (P = 0.334). Increased upper lip length (P = 0.037) and decreased nasal tip protrusion-nose height index (P = 0.017) correlated positively with aesthetic improvements after surgery. CONCLUSION: Although the association between parameters and satisfaction questionnaire was found, other influential factors should be considered before surgery as well.

Anthropometric Facial Changes After Orthognathic Surgery and Their Relation With Oral Health Related Quality of Life.

PURPOSE: The aim of the present study was to determine the impacts of orthognathic surgery on soft tissue on frontal and profile views and their relation with patient's quality of life. METHODS: Twenty-nine patients with severe skeletal class III malocclusion who were candidate for bimaxillary orthognathic surgery consisted of 1-piece Lefort I surgery with bilateral sagittal split osteotomy were selected. Oral health was assessed by short from of Oral Health Impact Profile-14 questionnaire. Facial anthropometric measurements were conducted before starting any treatment and 6 months after orthognathic surgery according to Farkas anthropometric study. The correlation between facial changes due to treatment and oral health were tested by Pearson correlation analysis. RESULTS: No significant differences were observed in Oral Health Impact Profile-14 scores with regard to genders. Decreased vermilion total upper lip height index correlates positively with feeling difficult to relax. Increasing in medial-lateral cutaneous upper lip height index correlates negatively with dissatisfaction with diet. Increased upper face-face height index correlates positively with feeling uncomfortable to eat any foods and feeling a bit irritable with other people. CONCLUSION: Oral health-related quality of life can be affected not only by the objective aesthetic criterion but also by different factors like their attitude toward aesthetic, surgery side effects.