不同牙尖斜度对隐裂牙折裂模式及风险的影响  

Impact of Cusp Inclinations on Dental Fractures in Cracked Tooth Syndrome Model and Relevant Risk Evaluation

作　　者：谢妮娜 吴翠 王鹏来 王雯 刘宗响 XIE Ni-na WU Cui WANG Peng-lai WANG Wen LIU Zong-xiang(Department of Pediatric Dentistry, Affiliated Xuzhou Stomatological Hospital of Xuzhou Medical University, Xuzhou 221002, China Department of Oral and Maxillofacial Surgery, Affiliated Xuzhou Stomatological Hospital of Xuzhou Medical University, Xuzhou 221002, China Department of Periodontics, Affiliated Xuzhou Stomatological Hospital of Xuzhou Medical University, Xuzhou 221002, China.)

机构地区：[1]徐州医科大学附属徐州口腔医院儿童口腔科,江苏徐州221002 [2]徐州医科大学附属徐州口腔医院口腔颌面外科,江苏徐州221002 [3]徐州医科大学附属徐州口腔医院牙周科,江苏徐州221002

出　　处：《口腔医学研究》2017年第9期999-1003,共5页Journal of Oral Science Research

基　　金：江苏省徐州市科技计划项目(编号:KC14SH060)

摘　　要：目的:研究隐裂牙牙尖斜度对其折裂模式的影响,并制定折裂危险等级评分及治疗方案。方法:将40颗上颌前磨牙随机分为4组,前3组制备成不同牙尖斜度的隐裂牙模型,第4组不做处理作为对照组。所有试样进行压应力实验,记录折裂模式和危险等级,进行统计学分析。结果:就折裂模式:第1、2组试样发生冠根折数目较冠折多,第3组全部发生冠根折,第4组全部为冠折;就折裂危险分级:第1、2组发生III级折裂较多,第3组发生IV级折裂较多,第4组仅发生Ⅰ、Ⅱ级折裂,经随机区组秩和检验,第3组和第4组折裂危险等级与其余各组间有显著统计学差异(P<0.05),第1、2组间无统计学差异。结论:隐裂牙比正常牙齿更易发生复杂折裂。隐裂牙随着牙尖斜度增大到一定角度,折裂模式更加复杂,折裂危险等级也愈高,治疗预后越差。Objective： To explore the impact of cusp inclinations on dental fractures in cracked tooth syndrome model and formulate corresponding risk scale. Methods： Forty maxillary premolars were randomized into four groups. For cracked tooth models, buccal and palatal cusp inclinations were different, with Group IV as blank control. All groups underwent compression loading test and fracture levels were recorded for statistical analysis. Results： The fracture modes included a majority of crown root fractures and a minority of crown fractures in Groups I and II, exclusive crown root fractures in Group III, and exclusive crown fractures in Group IV. Overall, palatal fractures were predominant versus buccal fractures, with exclusive palatal fractures in Group IV, and oblique fractures were overwhelming versus the scanty vertical fractures. Fracture risk classification： grade III was prevalent in Groups I and II, grade IV in Group III, and grades I and II in Group IV only. The fracture risk scores in Groups III and IV had significant statistical differences versus Groups I and II （P〈0.05）, with insignificant differences between Groups I and II. Conclusion： Cracked teeth are more vulnerable to complex fractures, with increment of cusp inclinations contributable to complex fracture modes, involving deep fracture and high risk scores.

关 键 词：隐裂牙 牙尖斜度 折裂模式 折裂危险等级 

分 类 号：R781.2[医药卫生—口腔医学]