Influence of shaft design on the shaping ability of 3 nickel-titanium rotary systems by means of spiral computerized tomography.

作者信息

Versiani Marco Aurélio, Pascon Elizeu Alvaro, de Sousa Cássio José Alves, Borges Marco Aurélio Gagliardi, Sousa-Neto Manoel Damião

机构信息

Department of Endodontics, Associação Brasileira de Odontologia, Uberlândia, Brazil.

出版信息

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 Jun;105(6):807-13. doi: 10.1016/j.tripleo.2007.12.012. Epub 2008 Apr 18.

DOI:10.1016/j.tripleo.2007.12.012

PMID:18424117

Abstract

OBJECTIVE

To evaluate the influence of shaft design on the shaping ability of 3 rotary nickel-titanium (NiTi) systems.

STUDY DESIGN

Sixty curved mesial canals of mandibular molars were used. Specimens were scanned by spiral tomography before and after canal preparation using ProTaper, ProFile, and ProSystem GT rotary instruments. One-millimeter-thick slices were scanned from the apical end point to the pulp chamber. The cross-sectional images from the slices taken earlier and after canal preparation at the apical, coronal, and midroot levels were compared.

RESULTS

The mean working time was 137.22 +/- 5.15 s. Mean transportation, mean centering ratio, and percentage of area increase were 0.022 +/- 0.131 mm, 0.21 +/- 0.11, and 76.90 +/- 42.27%, respectively, with no statistical differences (P> .05).

CONCLUSIONS

All instruments were able to shape curved mesial canals in mandibular molars to size 30 without significant errors. The differences in shaft designs seemed not to affect their shaping capabilities.

摘要