| The aim of the study is to investigate the relation of the dental wedge-shaped defects (non-carious cervical lesion) with its attrition, its crown length and its crown-root ratio in Chinese 1839 premolars. The morphology of non-carious cervical lesions and the situation of attrition on the occlusal surface were observed and recorded. The length of the tooth and the root were determined. Then the crown length and the crown-root ratio were calculated. The depth and width of cervical lesions were also measured.Wedge-shaped defect was found in 644 premolars and the incidence was 35.02%. And the morphology of lesion was related to attrition on the occlusal surface (P<0.05). There is no significant difference in the crown length among lesions with different depth scales or width scales and the same occlusal attrition. And the similar results were obtained as for the crown-root ratio.Based on these findings, it can be concluded that the development of wedge-shaped defects in premolar is related to its occlusal attrition. |
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