摘要
背景:下颌第一恒磨牙牙根数目多,根管形态复杂,存在一定变异性且种族差异较大,研究该牙的牙根及根管变异对提高根管预备效果、减少根管遗漏具有重要的意义。目的:应用锥形束CT调查鲁西南地区汉族人下颌第一恒磨牙牙根及根管变异情况。方法:选取2012年9月至2015年10月在济宁医学院附属医院口腔科行锥形束CT扫描的患者656例,要求双侧下颌第一恒磨牙均在,且发育完全,外观形态完整,未经治疗。锥形束CT图像经Planmeca Romexis软件三维影像重建,观察鲁西南地区汉族人下颌第一恒磨牙牙根及根管变异特点。结果与结论:(1)在1 312颗下颌第一恒磨牙中,2个牙根的下颌第一恒磨牙发生率为70.66%(927/1 312),根管变异型以2个牙根3个根管为主,占48.09%(631/1 312);(2)远舌根的个体发生率为35.37%(232/656),远舌根在所有牙齿中的发生率为29.34%(385/1 312),远舌根的对称性发生率为68.95%(153/232),远舌根的发生率男性高于女性,差异有显著性意义(P<0.05),右侧高于左侧,差异有显著性意义(P<0.05);(3)鲁西南地区汉族人下颌第一恒磨牙大部分有2个牙根,2个牙根3个根管是主要的根管变异类型,远舌根的发生率较高。利用锥形束CT对牙根和根管变异进行分析,可以为临床根管治疗提供参考依据。
BACKGROUND： The number of roots and morphology of the root canal system of permanent mandibular first molars vary greatly among different populations; therefore, it is important to be familiar with the variations in the root and root canal for the location and negotiation of the canals. OBJECTIVE： To investigate the variations in the roots and root canal of permanent mandibular first molars in the Han population of southwest Shandong Province by cone-beam CT. METHODS： 656 patients undegoing cone-beam CT examination at the Department of Stomatology, Affiliated Hospital of Jining Medical University, from September 2012 to October 2015 were recruited, and all patients had healthy, well-developed, and untreated bilateral permanent mandibular first molars with normal appearance. Subsequently, the three-dimensional reconstruction based on cone-beam CT data was performed using Planmeca Romexis software to observe the variations in the root and root canal system of permanent mandibular first molars in the Han population of southwest Shandong Province. RESULTS AND CONCLUSION： Among 1312 permanent mandibular first molars, the incidence of permanent mandibular first molars with three roots was 70.66% （927/1312）; the majority of root canal variations involved two roots and three root canals, accounting for 48.09% （631/1312）. The incidence of distal root was 35.37% （232/656）, the incidence of distal root was 29.34% （385/1312） in total teeth, and the incidence of distal root bilaterally was 68.95% （153/232）. There was a significantly increased incidence of distal root on the right side than on the left side （P 〈 0.05）, and the incidence in the male was significantly higher than that in the female （P 〈 0.05）. These results suggest that most of Han populations in southwest Shandong Province have permanent mandibular first molars with two roots, and the root canal variations mainly involve two roots and three root canals, with the high incidence of distal root. Moreover, cone-beam CT is available for detecting the variation in roots and root canal system, which can provide references for root canal treatment.
作者
马海峰
耿海霞
钱君荣
刘贺
刘平
Ma Hai-feng Geng Hai-xia Qian Jun-rong Liu He Liu Ping(Department of Stomatology, Affiliated Hospital of Jining Medical University, Jining 272000, Shandong Province, Chin)
出处
《中国组织工程研究》
CAS
北大核心
2017年第16期2521-2526,共6页
Chinese Journal of Tissue Engineering Research
