COMPARISON OF THE SHAPING ABILITY OF DIA-PT AND PROTAPER-NEXT ROTARY FILE SYSTEMS (AN IN VITRO STUDY)

Hadeer El-Sayed Mohamed*, Dr. Mohamed Mokhtar Nagy and Dr. Sara Hossam Fahmy

ABSTRACT

Introduction: Shaping ability is very important stage in root canal treatment. It aimed to respect the natural curvature of root canal systems and preserve remaining dentin thickness to avoid over cutting of dentin which will cause weakening of the root. Aim: To compare shaping ability of two types of rotary systems in terms of Canal transportation, Canal centring and Change in canal curvature. Methodology: Fourty extracted human adult mandibular first molars were collected. Sample size used in this study was 40 mandibular molars,(n=40). They were divided into two groups (n=20) Group 1: twenty teeth were prepared by Dia- PT rotary file. Group 2: twenty teeth were prepared by Pro-Taper Next rotary file. Pre-instrumentation CBCT scans were superimposed then the dimensions were measured by calculating the shortest distance from the periphery of the uninstrumented canal to the periphery of the tooth in both mesial and distal directions. Root canal preparation was performed according to their group. After instrumentation, the specimens were scanned again in the same way as described for the pre-instrumentation scan. Recorded data were analyzed using the statistical package for social sciences, version 23.0 (SPSS Inc., Chicago, Illinois, USA). The quantitative data were presented as mean± standard deviation and ranges. Results: The Overall recorded statistically significant difference between groups according to values of transportation with p-value, There was no statistically significant difference between groups according to values of canal centering ratio with p-value. Conclusion: The new manufacturing method (Controlled memory wire) produced instruments with different microstructure and the process appeared to offer great impact on their clinical performance and the effect of the design of the rotary NiTi instruments can’t be neglected or under estimated.

Keywords: Shaping ability. Cone beam CT. Dia-PT rotary files. Pro Taper Next rotary files. Canal transportation. Canal centering. Degree of canal curvature.