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PURPOSE: This pilot clinical trial aimed to investigate accuracy of intra-oral scanning (IOS) with and without artificial reference markers in capturing total, subtotal and congenital nasal defects. BASIC PROCEDURES: Thirteen patients with 3 types of nasal defects were selected and digitally scanned using an IOS with (ScM) and without artificial markers (Sc). Patients were grouped as follows; Group T (total nasal defect), Group P (partial/subtotal nasal defect), Group C (congenital defect). Silicone impressions of the defects were made and poured to get a model that was scanned using a Desktop scanner (Imp). The standard tessellation language (STL) files obtained from IOS were registered and compared to each other using a processing software. RMS, positive and negative average values were used to report deviations between the scans. Kruskal Wallis test was used to study the effect of defect type, while Friedmann was used to study the effect of impression technique. Results were considered significant at P≤.05. MAIN FINDINGS: All deviation values showed statistically significant differences among the 3 studied nasal defects and among the 3 investigated impression techniques. The smallest deviation values were recorded in Sc-ScM of congenital defects (RMS= 0.13±0.04, +average=0.08±0.01, -average=-0.09±0.02), while the largest deviation values were recorded in IMP-Sc in the total defects (RMS= 0.38±0.05, +average=0.29±0.04, -average=-0.29±0.04). CONCLUSIONS: Within the limitations of this study, it was concluded that the nasal defect type and the use of artificial markers during scanning affect the deviation parameters of the obtained scan. The combined effect of the studied parameters calls for the use of markers in when scanning total nasal defects.

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ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Bandiaky ON, Le Bars P, Gaudin A, Hardouin JB, Cheraud-Carpentier M, Mbodj EB, Soueidan A. Comparative assessment of complete-coverage, fixed tooth-supported prostheses fabricated from digital scans or conventional impressions: A systematic review and meta-analysis. J Prosthet Dent. 2022 Jan;127(1):71-79. doi: 10.1016/j.prosdent.2020.09.017. Epub 2020 Nov 2. PMID: 33,143,901. SOURCE OF FUNDING: Information not available TYPE OF STUDY/DESIGN: Systematic review with meta-analysis of data.

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PURPOSE: The aim of this study is to investigate the prevalence of (TMD) as well as their potential risk factors among postgraduate students. MATERIALS AND METHODS: In this cross-sectional and correlation study, 1255 postgraduate students from different universities were recruited to answer Fonseca's anamnestic index (FAI) in addition to collected demographic data and relevant dental history. Fonseca's anamnestic index (FAI) was used to classify their TMD severity. Five hundred ninety-three participants, that had previous clinical/radiographic TMD reports, out of 1255 were included. Chi-square and fisher's exact tests investigated the relation between each predictor and TMD at P≤.05. A logistic binary regression analysis examined the model fit using -2Log likelihood and Pseudo R2 tests at P≤.05. RESULTS: Based on previous clinical/radiographic reports and on FAI, 73.4% of the participants had TMD, of which 57% had mild dysfunction, followed by moderate (31.7%), and severe (11.3%). There was a statistically significant association between sex, depression, lip/object biting and clenching with TMD (P <.001), where females were 2.302 times more likely to develop TMD than males. The combination of lip biting and clenching in a female dramatically increases the risk of TMD (-2 Log Likelihood =385.7, P<.001 and a Cox and Snell value = 0.315 and a Nagelkerke value = 0.395). CONCLUSION: TMD seems to be highly prevalent among postgraduate students in Egypt, whereby female postgraduate students who bite their lips and/or grind their teeth are particularly highly prone to the condition. Object biting and depression could be also considered as risk factors.