Canal preparation using only one Ni-Ti rotary instrument: preliminary observations.

AIM: To describe a novel canal preparation technique using only one Ni-Ti rotary instrument. SUMMARY: In this novel technique, the canal is negotiated to the working length with a size 08 hand file. Then, the canal preparation is completed with an F2 ProTaper instrument used in a reciprocating movement. In larger canals, the use of additional hand files may be required to complete the apical enlargement. *A novel canal preparation technique is introduced using only one Ni-Ti rotary instrument in a reciprocating movement. *The advantages of the technique include a reduced number of instruments, lower cost, a reduced instrument fatigue and the elimination of possible prion cross-contamination associated with the single use of endodontic instruments.

[Cost effectiveness analysis of two methods of preparing molar root canals].

PURPOSE: To evaluate the short-term clinical curative effects, cost effective ratio between ProFile nickel-titanium rotary preparation technique and stainless steel hand K-files preparation technique in molar root canal therapy. METHODS: All patients were randomly divided into two groups: 49 cases were prepared with stainless steel hand K-files in routine preparation technique; 45 cases were prepared with ProFile nickel-titanium rotary instruments in step-down technique. The clinical symptoms and cost were recorded. The data was analyzed by SPSS11.5 software package. RESULTS: The satisfactory rate of clinical effect of the NRPT group was significantly higher than SSPT(P = 0.034); The mean cost of the NRPT was significantly higher than SSPT (P = 0.001), the satisfactory rate of NRPT in severe curve subgroup was significantly higher than that of SSPT (P = 0.007), however, the C/E of NRPT was 394.52 Yuan less than SSPT. The former was 192.04 Yuan more than the latter in light curve subgroup. When it was classified by periapical condition before treatment, the satisfactory rate of NRPT was significantly higher than SSPT in negative subgroup yet (P = 0.012), the C/E of the former was 32.32 Yuan more than the latter; nevertheless, the C/E of the former was 376.47 Yuan more than the latter in positive subgroup; CONCLUSIONS: It is better to prepare with ProFile nickel-titanium rotary preparation technique in severe curve subgroup, however, the light curve subgroup should be prepared with stainless steel hand K-files preparation technique. To patients with positive periodontopathy, SSPT would save the cost of treatments, nevertheless, NRPT group have a higher short-term recent effect.