상악 구치에서의 구개측 굴곡파절 발현 비율 연구
A study of incidence of palatal side abfractions in maxillary posterior teeth
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목적: 굴곡파절의 대부분 연구들이 협측에 한정되어있다. 본 연구에서는 상악 구치부에서 구개측 굴곡파절의 빈도 조사를 통해 굴곡파절의 원인을 분석해보고자 한다. 연구 재료 및 방법: 총 3193개의 상악 구치를 대상으로 조사를 진행하였다. 구내 관찰과 모형 관찰, 그리고 모형 스캔을 통해 제작된 가상 모형을 관찰하는 방법으로 조사를 진행하였다. 그 결과를 치아, 연령, 성별, 악궁에 따라 분류하였다. 통계적 유의성의 평가를 위해 Chi-square test를 시행하였다(α = 0.05). 결과:상악 소구치(6.8%)보다 대구치(10.8%)에서 구개측 굴곡파절이 높은 빈도로 관찰되었고, 그중 제1대구치(39.1%)에서 가장 높은 빈도로 관찰되었다. 연령이 증가할수록 구개측 굴곡파절이 높은 빈도로 관찰되었으며 이는 통계적으로 유의성이 있었다(P < 0.05). 구개측 굴곡파절의 빈도는 성별에 따른 차이에서는 통계적으로 유의성이 없었으며(P > 0.05), 악궁에 따른 차이에서는 좌측에서 더 높은 빈도로 나타났고 통계적으로 유의성이 있었다(P < 0.05). 결론: 상악 구치에서 구개측 굴곡파절은 상악 제1대구치에서 높은 빈도로 관찰되었고, 연령의 증가에 따라 증가하는 양상을 보였다. 이와 같은 결과는 굴곡파절의 가장 주된 원인이 교합력임을 의미한다.
Abstract
Purpose: Most of studies dealing with abfractions are limited to the buccal surfaces of the teeth. In this study, we analyzed the cause for abfraction by investigating the incidence of palatal side abfractions in maxillary posterior teeth. Materials and Methods: We investigated a total of 3193 maxillary posterior teeth by an intraoral examination, model observation, and observation of virtual model fabricated using model scanning. We recorded the results and classified them depending on the type of teeth, age, gender, and side of arches. We also performed Chi-square test to evaluate the statistical significance among the groups (α = 0.05). Results: The incidence of palatal side abfraction of the maxillary molars (10.8%) was higher than the premolars (6.8%), and among them, the incidence of the 1st molars (39.1%) were the highest. The incidence of palatal side abfraction increased with age and was statistically significant (P < 0.05). There was no statistical significance in the difference by gender (P > 0.05); in the case of arches, left arch showed higher incidence and it was statistically significant (P < 0.05). Conclusion: Palatal side abfraction in maxillary posterior teeth was frequently observed in the maxillary 1st molars, and the incidence increased with age. This result suggests that the main reason for abfraction is due to occlusal force.
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