摘要
目的:评价牙胶尖对机用镍钛器械预备弯曲根管的适应性,探讨牙胶尖与弯曲根管壁适应性的最佳效果。方法:将塑料弯曲根管模型随机分为8组,其中4组为MTwo组、4组为Sendoline组,分别预备至0.06/20#、0.06/25#、0.04/35#、0.04/40#和0.04/20#、0.04/25#、0.04/30#、0.06/30#。单尖法充填根管,静置1周,将模型的根尖孔以上1、2、3、4和5mm处垂直于模型长轴方向用慢速切割机横切,并用显微镜照相,绘图软件测量各截面牙胶尖的充填率和糊剂的最大宽度。结果:距根尖孔1mm处,牙胶尖的充填率最小,越接近根尖口,充填率越大,距根尖孔5mm处,各组根尖部充填率均为最大值。随号数的增大,牙胶尖充填率减小,糊剂的宽度增大;当根管预备的号数<30#时,各组牙胶尖充填率和糊剂宽度比较差异无统计学意义(P>0.05);≥30#时,与0.04/30#组比较,0.04/35#组和0.04/40#组根尖部充填率减小(P<0.05);与0.04/35#组比较,0.04/40#组根尖部充填率减小,在距根尖1和4mm处差异有统计学意义(P<0.05),在距根尖2、3和5mm处差异无统计学意义(P>0.05)。与0.04/30#组比较,0.04/35#组根尖部糊剂的宽度增大,在距根尖1、2和3mm处差异无统计学意义(P>0.05),在距根尖4和5mm处差异有统计学意义(P<0.05);0.04/40#组根尖部糊剂的宽度增大,在距根尖1、2、4和5mm处差异有统计学意义(P<0.05),在3mm处差异无统计学意义(P>0.05)。与0.04/35#组比较,0.04/40#组根尖部糊剂的宽度增大,在距根尖1mm处差异有统计学意义(P<0.05),在距根尖2、3、4和5mm处差异无统计学意义(P>0.05)。0.04锥度组比0.06锥度组(相同号数)充填率大、根尖部糊剂的宽度小,但差异无统计学意义(P>0.05)。结论:根管预备终末号数<30#时,牙胶尖对根管壁的适应性最佳,充填效果最好。
Objective To evaluate the adaptability of gutta percha point to curved root canals prepared by rotatory nickel titanium（NiTi）instruments, and to investigate the best effect of the adaptability of gutta percha point and the wall of curved root canals. Methods The plastic curved root canal models were randomly divided into 8 groups. Four groups were named MTwo group, and the other groups were named Sendoline group. They were respectively prepared to 0.06/20^# , 0.06/25^# , 0.04/35^# , 0.04/40^# , and 004/20^# , 0.04/25^# , 0.04/30^# , 0.06/30^# .All of these models were filled using the single-cone technique. After a week, the models were cutted from the apical foramen to 1, 2, 3, 4, and 5 mm perpendicularly to the model with low speed diamond saw. Photographs were taken using microscope. The filling rates and the widths of the gutta percha point were measured by drawing software. Results The filling rates of gutta percha point were minimal at 1 mm section from the apical foramen. The closer it reached the apical foramen, the bigger the filling rates were seen. The filling rates in various groups at apical section were maximum at 5 mm section from the apical foraman. The filling rates were decreased and the widths of the gutta percha point were increased with the increasing of the number of gutta percha point. When the root canals were prepared to 〈30^# , the filling rates and the widths had no significant differences （P;〉0.05）. When the root canals were prepared to ≤30^# , the filling rates in 0.04/35^# group and 0.04/40^# group at apical section were decreased compared with 0, 04/30^# group（P〈0.05）. There were significant differences at 1 and 4 mm sections and there were no significant differences at 2, 3, and 5 mm sections in 0.04/40^# group compared with 0.04/35^# group（P〉0.05）. The width of the gutta pereha point at apical section of 0.04/35^# group was increased compared with 0.04/30^# group and there were no significant differences at 1, 2, and 3 mm sections（P〉0.05） and there
出处
《吉林大学学报（医学版）》
CAS
CSCD
北大核心
2014年第2期316-320,I0003,共6页
Journal of Jilin University：Medicine Edition
基金
吉林省科技厅科技发展计划项目资助课题(20130102096JC)
吉林省长春市科技局科技计划项目资助课题(12SF88)
关键词
弯曲根管
单尖法
机用镍钛
适应性
curved root canal
single-cone technique
rotatory nickel titanium
adaptability
