上颌第一磨牙近中颊根MB根管形态对根管充填效果的影响

目的：观察上颌第一磨牙近中颊根主根管（MB）形态，探讨采用冷侧压充填法(CLC)与连续波热牙胶充填法(CW)进行根管充填的临床效果。方法：收集吉林省长春地区80颗离体上颌第一磨牙，在MB根管中插入8～10#C锉，拍摄颊舌向数字式牙片测量根管弯曲度；Mtwo镍钛机用器械扩大成形MB后使用CT断层扫描根管测算扁平度。根据弯曲度与扁平度将根管分为强弯曲?强扁平型（QWQB）(n=16)、强弯曲?弱扁平型（QWRB）(n=26)、弱弯曲?强扁平型（RWQB）(n=14)和弱弯曲?弱扁平型（RWRB）(n=24)，4种类型的根管随机平均分为CLC组和CW组采用不同方法进行根管充填，CT断层扫描测算牙胶充填面积百分数（PGFA）。结果：在CLC组，PGFA大小排序为QWQB0.05）；CLC组QWQB、QWRB及RWQB型根管的PGFA均小于CW组，组间比较差异有统计学意义（P<0.05）；CLC组与CW组RWRB型根管PGFA组间比较差异无统计学意义（P>0.05）；CLC组与CW组总体比较，CLC组的PGFA较小，差异有统计学意义（P<0.05）。结论：进行上颌第一磨牙根管治疗时，CW效果优于CLC。

Effect of root canal obturation with morphology of first maxillary molar MB root canal

To study the morphology of first maxillary molar main mesiobuccal(MB) root canal and to observe the clinical effects of cold lateral condensation(CLC) and continuous wave obturation(CW).Methods 80 first maxillary molars were selected in Changchun area;with 8-10# C pioneer file in MB canal,the digital periapical films in buccolingual direction were used to measure the root canal curvature;CT scanning of root canals was performed to measure and calculate the root canal flatness whenthe root canals were prepared with Mtwo Ni-Ti instruments.The teeth were divided in groups for different curvature and flatness as QWQB type(n=16),QWRB type(n=26),RWQB type(n=14) and RWRB type(n=24).CLC and CW technique were used separately,and CT scanning of the root canal was performed to calculate the percentage of gutta-percha filled area (PGFA).Results In CLC group,the PGFA was decreased as the order: QWQB0.05）.The PGFA of QWQB,QWRB and RWQB root canals in CLC group were smaller than those in CW group（P<0.05）；there was no significant difference in the PGFA of RWRB root canal between CW group and CLC group (P>0.05).The whole PGFA in CW group was better than that in CLC group（P<0.05）.Conclusion The effect of CW technique is better than that of CLC in treatment of first maxillary molar root canal.