유치열기의 융합치가 영구치열에 미치는 영향
Effects of Fused Primary Teeth on the Permanent Dentition
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본 연구는 유치 융합치의 특징과 영구치열에 미치는 영향을 알아보고자 하였다. 4 - 6세 어린이 중 융합치가 관찰되는 84 명의 어린이를 조사하였으며, 융합치의 분포는 상악보다 하악에서, 2개의 융합치보다 1개가 발생한 경우가 높은 비율로 관찰되었으며 우식이환율은 하악보다 상악에서 높았다. 계승 영구치의 선천적 결손은 상악 유중절치와 유측절치 융합, 하악 유측절치와 유견치 융합, 하악 유중절치와 유측절치 융합 순이었으며, 과잉치 발생은 상악 유중절치와 유측절치 융합, 하악 유중절치와 유측절치 융합, 하악 유측절치와 유견치 융합 순으로 나타났다. 유치의 융합에 의한 계승 영구치의 맹출 지연은 하악에서는 나타나지 않았으나 상악의 경우 지연 발육되는 과잉치의 발생 가능성 및 이로 인한 영구 중절치의 맹출 지연 양상이높은 빈도로 관찰되었다. 따라서 융합치로 인한 맹출 지연의 문제를 최소화하기 위해 주기적인 방사선 검사 및 조기 치료가필요할 것으로 사료된다.
Abstract
The purpose of the study was to investigate the distribution of primary fused teeth and identify the correlation between primary fused teeth and their effect on permanent dentition. 2575 children between the age of 4 and 6 in Kyungpook National University Hospital from January 2009 to August 2015 were investigated. A total of 84 children (46 boys and 38 girls) had fused teeth. 14 of these children had two fused teeth. Prevalence of caries involvement was in 65% of maxilla and 6% of mandible. Prevalence of permanent successors missing was 86.3% in the cases involving maxillary central and lateral incisor, 70% in mandibular lateral incisor and cuspid, 11.7% in mandibular central and lateral incisor. 27 of 84 children (32.1%) had supernumerary teeth. The highest prevalence rate is seen in the cases involving maxillary central and lateral incisor. Delayed permanent tooth eruption was only observed in the maxilla because of developing supernumerary tooth. Early diagnosis of fused tooth in the primary dentition can allow the dentist to make treatment plan at the appropriate time in accordance with the tooth arrangement and tooth development.
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