교합면의 해부학적 형태와 교합만곡의 연관성에 대한 연구
Association between mandibular occlusal morphology and occlusal curvature
남신은, 이희경,
소속 상세정보
남신은 ( Nam Shin-Eun ) - 대구보건대학교 치기공과
이희경 ( Lee Hee-Kyung ) - 대구보건대학교 치기공과
KMID : 0362120160380030217
Abstract
Purpose: This study aimed to generate 3-D occlusal curvatures and evaluate the relationship between the occlusal curvatures and mandibular occlusal morphology factors.
Methods: Mandibular dental casts from 25 young adult Korean were scanned as a virtual dental models with a 3- D scanner(Scanner S600, Zirkonzahn, Italy). The curve of Spee, curve of Wilson, and Monson’s sphere were generated by fitting a circle/sphere to the cusp tips using a least-squares method. The mandibular mesiodistal cusp inclination, buccolingual cusp inclination, and tooth wear parameters were measured on the prepared virtual models using RapidForm2004(INUS technology INC, Seoul, Korea). Wilcoxon signed-rank test was performed to test side difference, and Spearman’s rank correlation coefficients were investigated to verify the correlation between occlusal curvatures and correlated factors (a=0.05).
Results: The mean radii of curve of Spee were 83.09±33.94 in the left side and 79.00±28.12㎜ in the right side. The mean radii of curve of Wilson were 66.82±15.87㎜ in the mesial side and 47.87±9.40㎜ in the distal side with significantly difference between mesiodistal sides(p<0.001). The mean radius of Monson ’s sphere was 121.85±47.11㎜. Most of the cusp inclination parameters showed negative correlation for the radius of Monson’ sphere(p<0.05). Especially, the buccolingual cusp inclinations in mesial side of molar showed high correlation coefficients among the factors(p<0.05).
Conclusion: The radius of Monson’s sphere was greater than the classical 4-inch values, and the buccolingual cusp inclinations in mesial side of molar can be considered as one of the main factors correlating with the radius of Monson’s sphere.
키워드
Curve of Spee; Curve of Wilson; Monson’s sphere; cusp inclination; tooth wear; 3-D virtual models
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