ProTaper机用镍钛技术在根管预备中的应用研究

目的 观察ProTaper机用镍钛技术预备根管的临床效果。方法 312例患者分成两组,镍钛根管锉(PT)组156例,采用ProTaper机用镍钛器械预备根管,不锈钢K型根管锉(SS)组156例,采用常规ISO手用不锈钢根管锉和逐步深入技术预备根管。记录根管预备时间及断针情况。根充后即刻摄片观察根充效果,术后3d复诊,评估术后疼痛情况。结果 根管预备时间PT组为(4.06±0.51)min,SS组为(6.11±0.56)min;根管恰填率PT组为89.25％,SS组为78.12％;根充术后疼痛率PT组为2.25％,SS组为9.05％;断针率PT组为5.64％,SS组为1.52％。两组间差异均有显著性(P<0.01)。结论 ProTaper机用镍钛技术具有良好的根管成形性能,根充效果好,操作简易。但断针率较手用不锈钢根管锉高。

A Clinical Study of the ProTaper Nickel- titaniun Rotary Technique in Root Canal Preparation

Objective To evaluate the clinical outcome of ProTaper nickel - titanium(NiTi) rotary instruments in root canal preparations. Methods 312 patients were divided into two groups randomly: 156 cases were prepared for using the ProTaper technique (PT group); 156 cases were prepared for stainless steel hand K - files and the Step - down technique (SS group). The preparation time and incidence of instrument fracture were recorded. Root canal obturation was carried out at the same visit and the outcome was evaluated based on post - operative radiographs. Patients were reviewed 3 days later. The incidence and degree of post - operative pain were recorded. Results The preparation time was (4.06 + 0.51)min in PT group and (6.11 + 0.56)min in SS group. 89.25% of the canals in PT group were obturated as compared with 78.12% in SS group. The incidences of post - operative pain were 2.25 % in PT group while 9.05 % in SS group. The rate of instrument fracture in PT group was 5.64% as compared with 1.52% in SS group. Differences between the two groups were statistically significant (P < 0.01). Conclusion The ProTaper technique showed better shaping ability and improved predictability in root canal obturation than stainless steel hand instruments. It was highly efficient as well. The incidence of instrument fracture, however, was higher than that of stainless steel hand K- files.