• 대한치과교정학회지
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• 제29권3호
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• pp.349-360
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• 1999

전치부 수직피개 (overbite)는 하악평면, 구개평면 또한 AB 평면의 경사도에 의해 결정된다는 사실이 구명되었으며, ODI (overbite depth indicator)는 overbite의 세 결정요인이라 할 수 있는 FMA, PPA FABA의 합으로 구성되는 것으로 분석되었다. 따라서 ODI와 세 결정요인들과의 상호관계를 기하학적으로 분석하여 그 관계계수를 산출하였다. ODI 정상수치를 나타내는 관계식에 산출된 관계계수를 대압하여 정리하면, ODI norm=$85^{\circ}-0.5PMA-( 1.08 - 0.01FMA)( FABA-81^{\circ})$라는 식이 도출된다. 이는 ODI 정상수치는 절대적 개념이 아니라 개개인의 골격형태에 의해 결정되는 상대적 개념으로 파악해야 함을 의미하는 것이다. 이렇게 산출한 ODI정상수치 (Individualized ODI norm)개념의 임상적 적용과 진단학적 의미에 대하여 구체적으로 논의하였다.

• 대한치과교정학회지
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• 제44권2호
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• pp.96-102
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• 2014

Objective: A recent study suggested that rs6504340, a polymorphism within the homeobox B (HOXB) gene cluster, is associated with the susceptibility for malocclusions in Europeans. The resulting malocclusions require orthodontic treatment. The aim of this study was to investigate the association of rs6504340 and other dentition-implicated polymorphisms with dental and occlusal traits in Korean and Japanese populations. Methods: The study participants included 223 unrelated Koreans from the Busan area and 256 unrelated Japanese individuals from the Tokyo metropolitan area. DNA samples were extracted from saliva specimens. Genotyping for rs6504340 and four single nucleotide polymorphisms (SNPs) that have been shown to be associated with the timing of first tooth eruption and the number of teeth at 1 year of age (rs10506525, rs1956529, rs9674544, and rs8079702) was performed using TaqMan assays. The Index of Orthodontic Treatment Need (IOTN), overjet, overbite, arch length discrepancy, crown sizes, and length and width of the dental arches were measured. Spearman's correlation coefficients were calculated to evaluate relationships between rs6504340 and these dental/occlusal traits. Results: We evaluated the aesthetic components and dental health components of the IOTN in the Korean and Japanese populations and found that neither rs6504340 nor the other four SNPs showed any association with dental and occlusal traits in these East Asian populations. Conclusions: These negative results suggest that further research is needed to identify the genetic determinants of malocclusions in order to reach a consensus.