Apical dentinal defects after root canal preparation, obturation and retreatment using rotary and reciprocating instruments: An In-vitro study

Apical dentinal defects using rotary and reciprocating instruments

Abstract

Objectives: To evaluate apical cracks after root canal preparation and after retreatment procedures using different NiTi rotary systems either continuous rotation motion or reciprocation motion.

Materials and Methods : A total of 40 freshly extracted single rooted teeth could were used in this study, teeth were divided into 2 main groups (n=20) for each. Group A was prepared with continuous rotation motion (Revo-S). Group B was prepared with reciprocation motion (Wave One). Both groups were divided into two subgroups. Subgroup I was retreated by continuous rotation motion (R-Endo). Subgroup II was retreated by reciprocation motion (Wave One). These teeth were mounted in gypsum blocks which surrounded by impregum to simulate periodontal ligament. All teeth were trimmed 1 mm apically then scanned by digital stereomicroscope preparation, after root canal preparation, after obturation and after retreatment procedure. The evaluation was performed in blind manner by two observers who were not informed of nature or purpose of the investigation. Evaluation was repeated twice for all specimens to insure intra examiner consistency. Mann-Whitney was used to compare between two groups in non- related samples. Friedman test was used to compare between more than two groups in related samples. Wilcoxon was used to compare between two groups in related samples.

Results: No significant difference between continuous rotation motion and reciprocation motion in producing apical cracks during root canal preparation and retreatment procedure was found.

Conclusions: The reciprocation motion produced non significantly more cracks than continuous rotation motion as quantity during root canal preparation and retreatment.