CAJ | 학술논문

目的:评价倒敞法结合Hero 642和ProTaper机用镍钛锉预备重度弯曲后牙根管的疗效.方法: 随机将100 颗患牙髓炎或根尖周炎、最大根管弯曲度≥25°的后牙分为2 组,各50 例.实验组(A组)采用倒敞法,而对照组(B组)不采用倒敞法机械预备.A组以机用开口锉根管中上端敞开后,手用K锉预备根尖,再先用镍钛器械Hero 642,后用ProTaper预备根管;B组则直接应用Hero 642和ProTaper冠向下法预备根管. 2 组均用侧压法充填根管.根据X线片情况,预备时间,器械折断、疼痛等并发症,评价根管预备和充填的疗效,1 年随访率95%.结果:A组倒敞法结合Hero 642和ProTaper机用镍钛锉预备重度弯曲后牙根管,锥度、流畅度好,术后疼痛少且程度轻,无器械折断;而B组发生器械折断3 支(P>0.05);充填恰充率、欠充率、流畅度、术后疼痛两者有显著性差异(P<0.05).结论: 倒敞法结合Hero 642和ProTaper机用镍钛锉预备重度弯曲后牙根管,成形、根充效果好,并发症少,最大限度发挥了各自优点,是预备重度弯曲后牙根管值得推广应用的有效方法.
목적:평개도창법결합Hero 642화ProTaper궤용얼태촤예비중도만곡후아근관적료효.방법: 수궤장100 과환아수염혹근첨주염、최대근관만곡도≥25°적후아분위2 조,각50 례.실험조(A조)채용도창법,이대조조(B조)불채용도창법궤계예비.A조이궤용개구촤근관중상단창개후,수용K촤예비근첨,재선용얼태기계Hero 642,후용ProTaper예비근관;B조칙직접응용Hero 642화ProTaper관향하법예비근관. 2 조균용측압법충전근관.근거X선편정황,예비시간,기계절단、동통등병발증,평개근관예비화충전적료효,1 년수방솔95%.결과:A조도창법결합Hero 642화ProTaper궤용얼태촤예비중도만곡후아근관,추도、류창도호,술후동통소차정도경,무기계절단;이B조발생기계절단3 지(P>0.05);충전흡충솔、흠충솔、류창도、술후동통량자유현저성차이(P<0.05).결론: 도창법결합Hero 642화ProTaper궤용얼태촤예비중도만곡후아근관,성형、근충효과호,병발증소,최대한도발휘료각자우점,시예비중도만곡후아근관치득추엄응용적유효방법.
Objective: To evaluate the treatment efficacy of reverse flaring technique applied by two rotary instruments, Hero 642 and ProTaper, on complicated molar root canal preparation. Methods: 100 molars with curved root canals (maximum curved angle ≥25 degrees) suffered from pulpitis or periapicities were randomly divided into two groups. In experimental group reverse flaring technique was applied by rotary instruments while in control group reverse flaring technique was not adopted. 50 experimental teeth with curved canals were operated with K files, Hero 642 and ProTaper in sequence. Lateral condensation obturation method was utilized in both groups. Root canal preparation and obturation efficiency were evaluated by X-ray, root canal preparation time and complication incidence (1 year follow-up rate was 95%). Results: Reverse flaring technique applied by Hero 642 and ProTaper Ni-Ti rotary instruments on complicated (curved) root canal preparation in group A demonstrated better root canal coning and smoothness, without instrument fractures, while instrument fractures occurred in control group. Significant difference was found in exact root canal obturation rate and not enough full rate, root canal smoothness and postoperative pain between two groups(P<0.05). Conclusion: Reverse flaring technique applied by Hero 642 and ProTaper NI-Ti rotary instruments indicates complementary potencies, demonstrating satisfactory root canal shape and obturation effectiveness, and lower complication incidence. Reverse flaring technique applied by Ni-Ti rotary instruments is apt for medium/severe curved root canal preparation and worthy of clinical application.