NSK reciprocating handpiece: in vitro comparative analysis of dentinal removal during root canal preparation by different operators.
The purpose of this study was to assess dentin removal during root canal preparation by different operators using a NSK reciprocating handpiece. Eighty-four human single-rooted mandibular premolars were hand instrumented using Triple-Flex stainless-steel files (Kerr) up to #30, weighed in analytical balance and randomly assigned to 4 groups (n=21). All specimens were mechanically prepared at the working length with #35 to #45 Triple-Flex files (Kerr) coupled to a NSK (TEP-E10R, Nakanishi Inc.) reciprocating handpiece powered by an electric motor (Endo Plus; VK Driller). Groups 1 to 4 were prepared by a professor of Endodontics, an endodontist, a third-year dental student and a general dentist, respectively. Teeth were reweighed after root canal preparation. The difference between weights was calculated and the means of dentin removal in each group were analyzed statistically by ANOVA and Tukey's test at 5 % significance level. The greatest amount of dentin removal was found in group 4, followed by groups 2, 3 and 1. Group 4 differed statistically from the other groups regarding dentin removal means [p<0.001 (group 1); p=0.005 (group 2); and p=0.001 (group 3)]. No statistically significant difference was found between groups 1 and 2 (p=0.608), 1 and 3 (p=0.914) and 2 and 3 (p=0.938). In conclusion, although the group prepared by a general dentist differed statistically from the other groups in terms of amount of dentin removal, this difference was clinically irrelevant. The NSK reciprocating handpiece powered by an electric engine was proved an effective auxiliary tool in root canal preparation, regardless of the operator's skills.
Wagner
Márcia Helena
MH
Department of Endodontics, University of Santa Cruz do Sul, Santa Cruz do Sul, RS, Brazil. marciawagner@via.com.br
Barletta
Fernando Branco
FB
Reis
Magda de Souza
Mde S
Mello
Luciano Loureiro
LL
Ferreira
Ronise
R
Fernandes
Antônio Luiz Rocha
AL
D000704:Analysis of Variance; D003754:Dental High-Speed Equipment; D003804:Dentin / Q000601:surgery*; D006801:Humans; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation