Gustavo De-Deus1, Paulo Garcia-Filho. 1. Department of Endodontics, Veiga de Almeida University, Rio de Janeiro, Brazil. endogus@gmail.com
Abstract
OBJECTIVE: The present study was designed to test the null hypothesis that there is no significant difference in debridement quality promoted by 3 nickel-titanium (NiTi) rotary systems. STUDY DESIGN:Sixty-seven vital mandibular molars that were prospectively collected in vivo were used. The teeth were extracted and then pulp tissue fixed by 10% formalin. The use of different NiTi rotary systems resulted in 3 experimental groups with 20 specimens each: G1: Hero 642; G2: K3; and G3: ProTaper Universal. Afterward, the specimens were histologically prepared and serial 0.5 microm cross-sections were obtained every 0.2 mm from the 1-3 mm apical levels. The remaining pulp tissue was assessed using a morphometric approach. The cross-sectional area of each root canal and remaining pulp tissue were measured (mcirom(2)). Thus, the percentages of remaining pulp tissue area were calculated for each root canal. RESULTS: Overall, the pooled data obtained from all levels revealed a variable amount of remaining pulp tissue for all experimental groups. Remaining pulp tissue existed in every specimen. However, the Kruskal-Wallis H test was unable to show significant differences among the experimental groups (P > .05) for the pooled data from all levels. CONCLUSIONS: The present study did not find a significant difference in the quality of canal debridement between different NiTi rotary systems, because an adequate tapered shape is obtained.
RCT Entities:
OBJECTIVE: The present study was designed to test the null hypothesis that there is no significant difference in debridement quality promoted by 3 nickel-titanium (NiTi) rotary systems. STUDY DESIGN: Sixty-seven vital mandibular molars that were prospectively collected in vivo were used. The teeth were extracted and then pulp tissue fixed by 10% formalin. The use of different NiTi rotary systems resulted in 3 experimental groups with 20 specimens each: G1: Hero 642; G2: K3; and G3: ProTaper Universal. Afterward, the specimens were histologically prepared and serial 0.5 microm cross-sections were obtained every 0.2 mm from the 1-3 mm apical levels. The remaining pulp tissue was assessed using a morphometric approach. The cross-sectional area of each root canal and remaining pulp tissue were measured (mcirom(2)). Thus, the percentages of remaining pulp tissue area were calculated for each root canal. RESULTS: Overall, the pooled data obtained from all levels revealed a variable amount of remaining pulp tissue for all experimental groups. Remaining pulp tissue existed in every specimen. However, the Kruskal-Wallis H test was unable to show significant differences among the experimental groups (P > .05) for the pooled data from all levels. CONCLUSIONS: The present study did not find a significant difference in the quality of canal debridement between different NiTi rotary systems, because an adequate tapered shape is obtained.
Authors: Prabu Mahin Syed Ismail; Siddiq Ahamed; P B Sabiha; M Chandra Sekhar; Gopikrishna Moosani; S Nagalakshmi Reddy; N Upendranatha Reddy; C H Sumanthi Journal: J Clin Diagn Res Date: 2016-12-01