Background:The study of twins is a well-known and a unique method that is used to investigate the genetic contributions to physical features and diseases in human.Aim:To estimate the relative contributions of genetic and environmental influence to observed variations in different dental features or traits.Methodology:Thirty twins in the age group of 15–30 years were selected for the study, and the dental caries experience scores, dental anomalies, and morphometric analysis of monozygotic (MZ) and dizygotic (DZ) twins were compared.Results:MZ twins unlike DZ twins showed within-pair resemblance in decayed, decayed missing and filled teeth (DMFT), and molar relation. No morphometric analysis parameters and dental anomalies had significant mean difference between the groups. Decay, filling, DMFT, spacing, mandibular irregularity, open bite, and mesiodistal width of the right and left canine showed a higher positive correlation in MZ than DZ twins. Heritability estimate was low for morphometric analysis parameters. There is genetic dominance in decay, DMFT, spacing, molar relation, and diastema. Pearson's correlation revealed a positive and statistically significant correlation among all morphometric analysis parameters for MZ twins, but not DZ twins. Dental caries has a higher concordance rate (87.5%), correlation (71.6%), and heritability (87.8%).Conclusion:Most of the dental parameters are significantly heritable with up to 85% of the variance attributable to genetic factors. Environmental factors play a major role in developing malocclusion and causing dental caries. Morphology of canines can be used as a supplementary tool to determine zygosity.
Aims and Objectives: To assess the perception, practice, and attitude about dental ergonomics among dental students in Chennai.
Materials and Methods:The study was carried out among 148 dental students in Chennai, Tamil Nadu, using a selfmade validated closed-ended questionnaire.Results: Among 148 dental students, 75 (50.6%) were undergraduate and 73 (49.4%) were postgraduate students. Of the study population, 38 (25.67%) had listed their general health problems which they thought were related to their profession, 102 (68.5%) were aware of musculoskeletal disorders, 90 (60.4%) were aware of dental ergonomics, and 104 (69.8%) were not aware of dental ergonomics. Of the dental students, 55% practiced both sitting and standing dentistry, and 43% of them practiced sitting dentistry alone. Only 22.8% of the dental students practiced 4-handed dentistry and 38.3% of them, who did not practice 4-handed dentistry swiveled themselves to face the area. A total of 113 (75.8%) dental students suggest to include dental ergonomics in their academic curriculum and 94 (63.1%) wanted to practice workshops on dental ergonomics.
Conclusions:A majority of the dental students in this present study were aware of musculoskeletal disorders and dental ergonomics, but only a considerable number of them practiced dental ergonomics. This study recommends the need for including dental ergonomics in the academic curriculum.
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