北京大学学报(医学版)
北京大學學報(醫學版)
북경대학학보(의학판)
JOURNAL OF BEIJING MEDICAL UNIVERSITY(HEALTH SCIENCES)
2015年
1期
129-133
,共5页
根管制备%牙根微裂%体外研究
根管製備%牙根微裂%體外研究
근관제비%아근미렬%체외연구
Root canal preparation%Root crack%In vitro
目的:比较HyFlex CM和ProTaper Universal两种镍钛器械预备根管后,根尖区牙根微裂的发生率。方法:收集60颗完整的离体下颌切牙,使用自凝树脂和藻酸盐印模材料进行包埋,暴露根尖区3 mm。随机分成3组(n=20),对照组不进行根管预备,两个实验组分别使用HyFlex CM 和ProTaper Universal 镍钛器械预备根管至#40/0.06。根管预备后,在距根尖孔1 mm、2 mm、3 mm处进行水平切盘,利用立体显微镜观察并记录牙根不同横截面牙根微裂的产生情况。结果:对照组未观察到牙根裂的产生, HyFlex CM 实验组牙根微裂的发生率为5%(1/20),ProTaper Universal实验组为85%(17/20),两实验组间牙根裂发生率的差异有统计学意义(P<0.01)。结论:以HyFlex CM镍钛系统进行根管预备产生根尖部牙根微裂的风险明显低于ProTaper Universal。
目的:比較HyFlex CM和ProTaper Universal兩種鎳鈦器械預備根管後,根尖區牙根微裂的髮生率。方法:收集60顆完整的離體下頜切牙,使用自凝樹脂和藻痠鹽印模材料進行包埋,暴露根尖區3 mm。隨機分成3組(n=20),對照組不進行根管預備,兩箇實驗組分彆使用HyFlex CM 和ProTaper Universal 鎳鈦器械預備根管至#40/0.06。根管預備後,在距根尖孔1 mm、2 mm、3 mm處進行水平切盤,利用立體顯微鏡觀察併記錄牙根不同橫截麵牙根微裂的產生情況。結果:對照組未觀察到牙根裂的產生, HyFlex CM 實驗組牙根微裂的髮生率為5%(1/20),ProTaper Universal實驗組為85%(17/20),兩實驗組間牙根裂髮生率的差異有統計學意義(P<0.01)。結論:以HyFlex CM鎳鈦繫統進行根管預備產生根尖部牙根微裂的風險明顯低于ProTaper Universal。
목적:비교HyFlex CM화ProTaper Universal량충얼태기계예비근관후,근첨구아근미렬적발생솔。방법:수집60과완정적리체하합절아,사용자응수지화조산염인모재료진행포매,폭로근첨구3 mm。수궤분성3조(n=20),대조조불진행근관예비,량개실험조분별사용HyFlex CM 화ProTaper Universal 얼태기계예비근관지#40/0.06。근관예비후,재거근첨공1 mm、2 mm、3 mm처진행수평절반,이용입체현미경관찰병기록아근불동횡절면아근미렬적산생정황。결과:대조조미관찰도아근렬적산생, HyFlex CM 실험조아근미렬적발생솔위5%(1/20),ProTaper Universal실험조위85%(17/20),량실험조간아근렬발생솔적차이유통계학의의(P<0.01)。결론:이HyFlex CM얼태계통진행근관예비산생근첨부아근미렬적풍험명현저우ProTaper Universal。
Objective: To compare the incidences of root cracks after canal instrumentation with HyFlex CM system and the ProTaper Universal system .Methods:Sixty mandibular incisors were mounted in resin blocks with simulated periodontal ligaments , and the apex was exposed .The control group of 20 teeth was not prepared , and the other 40 teeth were divided into 2 experimental groups ( n=20 ) .The 40 root canals of the experimental groups were instrumented using HyFlex CM and ProTaper Universal to the major apical foramen ( AF).The horizontal sections 1 mm, 2 mm, and 3 mm from the apex were observed under an optical stereomicroscope at 25 ×magnification .The presence of cracks was noted . Results:No cracks were found in the control teeth .Cracks were found in 1 of 20 ( 5%) teeth in HyFlex CM group , and 17 of 20 ( 85%) teeth in ProTaper Universal group .The difference between the two experimental groups was statistically significant (P<0.01).Conclusion: The HyFlex CM files caused fewer root cracks than the ProTaper Universal files during the root canal instrumentation .