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- Title
Exploring the association between genetic and environmental factors and molar incisor hypomineralization: evidence from a twin study.
- Authors
BARBOSA TEIXEIRA, RAFAEL JOSÉ PIO; ANDRADE, NATÁLIA SILVA; QUEIROZ, LISANCA CARVALHO CAVALCANTE; MENDES, FAUSTO MEDEIROS; MOURA, MARCOELI SILVA; DE FÁTIMA ALMEIDA DE DEUS MOURA, LÚCIA; MOURA LIMA, MARINA DEUS
- Abstract
Background. The etiology of molar-incisor hypomineralization (MIH) remains unknown. Studies indicate that it is multifactorial, and that genetic and environmental factors are involved. Research with twins provides important subsidy to investigate the Influence of genetics and environmental factors that act during pregnancy on the etiology of alterations. Aim. This cross-sectional study evaluated the agreement of molar incisor hypomineralization (MIH) between monozygotic and dizygotic twin pairs and the association with environmental factors. Design. The sample consisted of 167 pairs of twins (8-15 years old), 94 monozygotic and 73 dizygotic. The parents answered a questionnaire on sociodemographic data and pre-, peri-, and postnatal health. A dental examination was performed by two calibrated examiners (Kappa >0.88) for MIH diagnosis, following the criteria proposed by the European Academy of Pediatric Dentistry in 2003. Results. The prevalence of MIH was 29.3%. There was greater concordance of MIH between monozygotic twins for affected first molars and permanent incisors (P = 0.0012) and pairs of twins assessed (P = 0.0211). The presence of MIH was associated with family income between one and two wages (P = 0.009, prevalence ratio [PR] = 3.82, confidence interval [CI 95%] 1.40-10.44), above two wages (P = 0.007, PR = 4.60, 95% CI: 1.51-14.05), and gestational hemorrhage (P = 0.032, PR = 5.70, 95% CI: 1.16-28.14). Conclusions. The greater concordance in the diagnosis of MIH among monozygotic twins indicates a genetic influence, although environmental factors, such as family income and hemorrhage during pregnancy, are also associated with the occurrence of MIH.
- Subjects
TOOTH demineralization; TREATMENT of molar abnormalities; INCISORS; TWINS; PREGNANCY; TEETH abnormality genetics; DIAGNOSIS; GENETICS; CONFIDENCE intervals; HEMORRHAGE; PUERPERAL disorders; STATISTICS; SOCIOECONOMIC factors; DISEASE prevalence; ODDS ratio
- Publication
International Journal of Paediatric Dentistry, 2018, Vol 28, Issue 2, p198
- ISSN
0960-7439
- Publication type
Article
- DOI
10.1111/ipd.12327