单冠修复体牙尖斜度对冠修复后邻接关系影响研究

The effect of the cusp inclination on the adjacency relations after single crown restoration

目的探讨单冠修复体牙尖斜度的不同对冠修复后近远中邻接关系的影响。方法选择2004年1月至2010年5月在广州医学院荔湾医院口腔科因食物嵌塞而行上颌第一磨牙单冠修复的患者214例,按制作牙尖斜度的不同分为3组,即15～25°牙尖斜度组(68例)、>25～35°牙尖斜度组(70例)以及>35～40°牙尖斜度组(76例)。冠修复体制备完成后,检查修复体与邻牙的邻接关系,并于修复后第6、12和24个月每组各抽取40例进行临床随访,调查患者再次发生食物嵌塞的情况。结果修复后第6个月,3组患者之间食物嵌塞的发生率差异无统计学意义(P>0.05)。修复后第12、24个月,前2组患者之间食物嵌塞的发生率差异无统计学意义(P>0.05),而前2组和第3组患者之间食物嵌塞的发生率差异有统计学意义(P<0.05)。结论为了减少上颌第一磨牙单冠修复后再次出现食物嵌塞,建议降低牙尖斜度并和邻牙牙尖斜度协调。

Objective To study the effect of the different cusp inclination after crown restoration on the adjacency relations in the near or far space.Methods Totally 214 patients who needed crown restoration in Liwan Hospital of Guangzhou Medical College from January 2004 to May 2010 were divided into three groups according to the different cusp inclination,and 40 patients chosen randomly in each group were given clinical follow-up,finally the adjacency conditions in the crown restoration and tooth were recorded after the restorations were cemented and used in 6,12 and 24 months.Results The adjacency conditions were good in three groups in 6 months and in group 1 and group 2 in 12 and 24 months（P 0.05）,and there was food impaction in some patients（P 0.05）.Conclusions We suggest slowing down the cusp inclination to coordinate with the adjacent tooth and reduce the incidence of the food impaction after the restoration with maxillary molars.