(A) statistical study of the prediction of the dental arch change between mixed and permanent dentition
Authors
최선옥
Issue Date
1986
Description
치의학과/박사
Abstract
[한글]
저자는 1979년 부터 1985년까지 서울시내 E국민학교 만 6세에서 만 13세까지의 학생 61명(남자 28명, 여자 33명)을 대상으로 하악영구중절치와 제1대구치가 맹출했을때(StageⅠ), 하악영구측절치까지 맹출했을때(StageⅡ), 하악영구 제1, 2소구치까지 맹출하여 초기의 영구치열을 보일때(StageⅢ)로 나누어 하악의 경석고 모형을 제작하고 규격화된 우측 하악골 측방 방사선 사진을 촬영하여 치아와 악궁에 관한 각 변수의 계측, 변수간의 상관관계의 관찰과 다중 회귀분석으로 다음과 같은 결론을 얻었다.
2. 각 Stage별 계측치의 남녀간의 차이는 StageⅠ의 하악유견치간 악궁폭경, StageⅡ의 하악 제1소구치의 방사선 사진상 각도, StageⅢ의 하악 1-6 악궁장경에서 통계학적으로 유의의 차를 보여 남자가 더 크게 나타났다(p<0.05).
3. StageⅠ과 Ⅲ사이의 하악전치부 crowding 변화량은 하악우측 유측절치 원심면과 제1대구치 근심면간의 악궁 perimeter와 비교적 높은 상관관계가 있었다(r = 0.78, p<0.01).
4. StageⅠ과 Ⅲ사이의 하악전치부 crowding 변화량과 StageⅠ의 하악우측 유측절치 원심면과 제1대구치 근심면간의 악궁 perimeter, 하악 제2대구치의 방사선 사진상 각도로 다중회귀분석 결과, 산출된 회귀 방정식은 다음과 같다
Y=-0.39 X^^1 - 0.07×^^2 + 17.5
multiple R = 0.922
Sig F = 0.0013
Y : StageⅠ과 Ⅲ사이의 전치부 crowding 변화량
X^^1 : perimeter of 6-B(StageⅠ)
X^^2 : M^^2 angle(StageⅠ)
[영문]
The purpose of this study was to predict mandibular anterior crowding changes between mixed and early permanent dentition.
For this study, dental casts were taken from 61 children (male 28, female 33) longitudinally, age from 6 to 13 year who have an Angle's classⅠ relationship. Preeruptive tooth inclination to the occlusal plane were measured through matched lateral mandibular view film with cast. The subject divided to three stages; stageⅠ - eruption of mandibular central incisors and first permanent molars, stageⅡ - eruption of mandibular later incisors, stageⅢ - eruption of mandibular canines, first and second premolars.
In order to predict anterior crowding changes, correlations and multiple regression analysis was taken in preeuptive tooth inclination and parameters of dental casts.
The results were as follows.
1. Intercanine width of lower arch increased between stageⅠ and stageⅡ(P<0.05), and intermolar width(6-6) and 1-C length in lower arch increased(P<0.05) between stageⅡ and stageⅢ, and reverse in 1-6 lower arch length(P<0.05).
Statistically significant sex difference was fecund in intercanine width of lower arch (stageⅠ), preeruptive lower first premolar angle to acclusal plane (StageⅡ), and 1-6 length(StageⅢ).
They were larger in male(P<0.05).
3. Crowding changes (StageⅠ to Ⅲ) appeared to be highly correlated with arch perimeter(r=0.78, P<0.01).
4. The regression equation for predicting mandibular anterior crowding changes between stageⅠ and StageⅢ was as follows.
Y = -0.39X^^l - 0.07X^^2 + 17.5
multiple R = 0.922
Sig. F = 0.0013
Y ; mandibular anterior crowding changes between StageⅠ and Ⅲ
X^^1; mandibular arch perimeter from distal surface of lower right primary
lateral incisor to mesial surface of lower right first permanent molar(StageⅠ).
X^^2; radiographic lower second molar angle (StageⅠ).