CAJ | 학술논문

目的：比较3种超声倒预备尖对哑铃型牙根根管峡部预备成型的差异。方法：120颗由一个峡部连接2个主根管的哑铃型离体上颌前磨牙，随机均分成3组（n ＝40），分别用超声波配3种倒预备尖对根管峡部进行倒预备：①镍钛尖 RE2，②金刚砂尖 Berutti，③25＃K 锉。扫描电镜评价峡部的边缘质量、微裂数目和类型，采用 SPSS 13．0软件包进行 Kruskal Wallis Test 秩和检验。结果：超声波配镍钛尖 RE2组预备峡部边缘质量优于金刚砂尖 Berutti 组和25＃K 锉组（P ＝0．003）；微裂数目少于金刚砂尖 Berutti 组和25＃K 锉组（P ＝0．003）；3组间微裂类型无统计学差异（P ＝0．830）。结论：超声波配合镍钛尖 RE2倒预备更适用于预备根管峡部。
목적：비교3충초성도예비첨대아령형아근근관협부예비성형적차이。방법：120과유일개협부련접2개주근관적아령형리체상합전마아，수궤균분성3조（n ＝40），분별용초성파배3충도예비첨대근관협부진행도예비：①얼태첨 RE2，②금강사첨 Berutti，③25＃K 촤。소묘전경평개협부적변연질량、미렬수목화류형，채용 SPSS 13．0연건포진행 Kruskal Wallis Test 질화검험。결과：초성파배얼태첨 RE2조예비협부변연질량우우금강사첨 Berutti 조화25＃K 촤조（P ＝0．003）；미렬수목소우금강사첨 Berutti 조화25＃K 촤조（P ＝0．003）；3조간미렬류형무통계학차이（P ＝0．830）。결론：초성파배합얼태첨 RE2도예비경괄용우예비근관협부。
Objective:To compare the quality of the canal isthmus retropreparation among three ultrasonic retrotips.Methods:120 maxillary bicuspid teeth with 2 canals and an isthmus were randomly assigned to 3 groups(n =40).The canal isthmus were retro-preparated by ultrasonic Ni-Ti tip RE2,diamond tip Berutti and #25K file respectively.The quality of cavity margin,the number and type of the micro-cracks were evaluated by SEM.Data were statistically analysed by Kruskal Wallis Test of SPSS 13.0.Results:The cavity margin quality of ultrasonic Ni-Ti tip RE2 group was superior to that of other 2 groups(P =0.003);The number of micro-crack in Ni-Ti tip RE2 group was less than that of other 2 groups(P =0.003).The type of micro-cracks has no significant difference among the 3 groups(P =0.830).Conclusion:Ultrasonic Ni-Ti tip RE2 is feasible in the canal isthmus retropreparation.