The association between MMP−13 rs478927 gene polymorphism and dental caries susceptibility in children with mixed dentition from Birjand, Iran: A case‐control study.

Background and Aims: Gene polymorphisms are responsible for at least part of the variation in caries susceptibility despite similar environmental factors. Genes involved in enamel formation like matrix metalloproteinase‐13 (MMP‐13) may participate in caries process. The aim was to investigate the association between MMP‐13 rs478927 polymorphism and caries susceptibility in 6‐years‐old children from Birjand, Iran. Methods: Six‐years old children from Birjand, Iran, participated in this study. The total decayed, missing, and filled teeth were calculated and defined as caries index (CI). Based on this CI, two groups of high‐caries (case) and low‐caries (control) were taken into account. Saliva samples were collected and DNA was extracted. The allele and genotypes of MMP‐13 rs478927 polymorphism were determined by tetra‐primer amplification refractory mutation system‐polymerase chain reaction (T‐ARMS‐PCR) method. p Value was significant if p < 0.05. Results: Three hundred sixty‐seven children consisted of 186 low‐caries children and 181 high‐caries children were included in this study. The mean CI was 6.02 ± 0.81. There was no significant association between high and low‐caries groups based on socioeconomic status, eating sweet snacks, parents' susceptibility to dental caries, duration of breastfeeding, and the brushing habit (p > 0.05). There wasn't any significant association between genotype distribution of MMP‐13 rs478927 polymorphism and CI groups (p = 0.924). This polymorphism was associated with increased caries susceptibility under all genetic models but this effect was not significant (p > 0.05). Conclusion: The MMP‐13 rs478927 gene polymorphism was not significantly associated with dental caries susceptibility in Birjandi children with mixed dentition. It is recommended to conduct studies on children of different dentitions to better understand the role of this polymorphism on caries susceptibility in primary and permanent teeth of children. [ABSTRACT FROM AUTHOR]