牙冠轴面突度的变化对牙周组织健康的影响

目的　研究不同程度增加牙冠轴面突度对牙周龈沟液量 (GCF)、龈沟液中天冬氨酸转氨酶 (GCF AST)、碱性磷酸酶 (GCF ALP)水平及软垢堆积水平的影响。方法　将牙冠颊面分别增加0 2mm、0 5mm和 0 8mm ,于 1、4和 8周时测量龈沟液量 ,检测GCF AST、GCF ALP水平 ,记录软垢堆积水平。结果　牙冠轴面突度增加 0 2mm ,各指标没有明显变化 ;增加 0 5mm ,GCF AST水平明显增加 ;增加 0 8mm ,GCF AST、GCF ALP水平增加显著。结论　牙冠轴面突度增加不利牙周健康 ,增加越大 ,牙周健康受到的损害越大

Effects of change of crown contour on health of gingiva

Objective To study the effects of different excessive crown contours on the health of periodontium. Methods A total of 63 posterior teeth of 12 volunteers were randomly divided into three groups and each group was consisted of 21 teeth. The buccal surfaces of the teeth were overcontoured 0 2 mm,0 5 mm,and 0 8 mm respectively At the point of 1 week,4 weeks and 8 weeks,gingival cervical fluid (GCF) were collected, GCF aspartate aminotransferase (GCF AST) and GCF alkaline phosphatase (GCF ALP) levels were tested and the debris amount was assessed for three groups Results The 0 8 mm group presented most amount of GCF, highest level of GCF AST, GCF ALP and most debris. The 0 5 mm group was the second. When the excess was 0 2 mm, all indexes showed no statistically significant change Conclusions Excessive crown contour is unfavourable to periodontium health The more the teeth are excessively contoured,the more they impair periodontium