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KMID : 0362120160380030217
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Journal of Technologic Dentistry
2016 Volume.38 No. 3 p.217 ~ p.224
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Association between mandibular occlusal morphology and occlusal curvature
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Nam Shin-Eun
Lee Hee-Kyung
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Abstract
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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.
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KEYWORD
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Curve of Spee, Curve of Wilson, Monson’s sphere, cusp inclination, tooth wear, 3-D virtual models
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