새로운 정량적 마모 지표를 이용한 한국인과 일본인의 제1대구치의 마모도 비교 (Comparisons of Tooth Wear of the First Molar in Korean and Japanese Using New Quantitative Measurement Parameters)

서지정보

· 발행기관 : 대한치과재료학회
· 수록지 정보 : 대한치과재료학회지 / 39권 / 3호 / 241 ~ 250페이지
· 저자명 : 남신은, 박영석, 류홍렬, 임영설, 이승표

초록

This study was aimed to compare the amount of tooth wear between Korean and Japanese quantitatively using newly developed tooth wear parameters. Maxillary and mandibular full-mouth dental stone casts were prepared from female dental students of Korea and Japan. The casts were scanned and rendered as virtual dental models with 3-D scanner. Reference points are selected, which is stable even after wear, on the first molar of virtual model through specialized program tools. Virtual vectors and occlusal planes were generated from reference points. Two maxillary and three mandibular angles between cusp tips, and four heights from virtual vectors or occlusal planes to central pits of both arches were measured and analysed.
Independent-samples T-Test or Mann-Whitney Test were performed to compare differences between two racial groups. Angles between cusp tips were larger and the heights from virtual vectors and occlusal planes to the central pit were shorter in Korean groups (p<.05). That is, cusps were shorter in Korean than Japanese, which means tooth wear was greater in Korean. Especially, the heights from buccal/lingual occlusal planes to the central pits showed high statistically significant differences in both maxillary and mandibular first molars (p<.001). These results could be used as meaningful quantitative parameters in case of comparisons of different tooth wear tendency between races.

영어초록

This study was aimed to compare the amount of tooth wear between Korean and Japanese quantitatively using newly developed tooth wear parameters. Maxillary and mandibular full-mouth dental stone casts were prepared from female dental students of Korea and Japan. The casts were scanned and rendered as virtual dental models with 3-D scanner. Reference points are selected, which is stable even after wear, on the first molar of virtual model through specialized program tools. Virtual vectors and occlusal planes were generated from reference points. Two maxillary and three mandibular angles between cusp tips, and four heights from virtual vectors or occlusal planes to central pits of both arches were measured and analysed.
Independent-samples T-Test or Mann-Whitney Test were performed to compare differences between two racial groups. Angles between cusp tips were larger and the heights from virtual vectors and occlusal planes to the central pit were shorter in Korean groups (p<.05). That is, cusps were shorter in Korean than Japanese, which means tooth wear was greater in Korean. Especially, the heights from buccal/lingual occlusal planes to the central pits showed high statistically significant differences in both maxillary and mandibular first molars (p<.001). These results could be used as meaningful quantitative parameters in case of comparisons of different tooth wear tendency between races.

참고자료

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