COMPARATIVE EVALUATION OF FRACTURE RESISTANCE OF MANDIBULAR BICUSPIDS INSTRUMENTED WITH HAND FILES, TRUNATOMY, ROTARY FILE AND RECIPROCATING FILE SYSTEM: AN IN VITRO STUDY

INTRODUCTION:The primary goal of endodontic therapy is to eliminate the infected dental tissue and disinfect the entire root canal using various instruments and material. Nickle Titanium rotary and reciprocating instruments enabled better canal shaping because of their flexibility. Root canal instrumentation with motorized endodontic files results in weakening the dentin integrity, leading to a reduction in the fracture resistance of treated tooth. Instruments used for root canal shaping have evolved from conventional 2% taper hand instruments to recently used rotary and reciprocating instruments with a greater taper (4% 9% taper). As these files have a design, which incorporates increasing tapers, it results in the aggressive removal of the radicular dentin reducing the fracture strength.

OBJECTIVE: To comparatively evaluate the fracture resistance of mandibular bicuspids instrumented with hand files, trunatomy, rotary and reciprocating file system- an in vitro study.

METHOD:50 single rooted extracted human permanent premolars were collected and decoronated to obtain 14mm root length, samples were divided into 5 groups. In Group 1 instrumented with hand file, Group 2 with Trunatomy file, Group 3 Protaper universal Group 4 with endostare3 and Group 5 using Waveonegoldfile system. All the groups were obturate using lateral compaction with AH plus sealer. Samples were mounted with acrylic and subjected to compressive loading to evaluate the fracture resistance using a universal testing machine, one way ANOVA and Tukey HSD test were used for statistical analysis.

RESULTS:Highest mean compressive strength was recorded in Group 2 followed by Group 1, Group 5, Group 4 and Group 3.

CONCLUSION: Trunatomy files showed highest fracture resistance among all the groups result also supports use of lesser tapered instrument improves fracture resistance of endodontically treated teeth.