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Joshi, Chintan
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Dentistry

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Stereomicroscopic Evaluation of Dentinal Microcracks After Instrumentation of Curved Canal with Rotary Files in Two Motions Vasava, Nupur; Modi, Shreya; Joshi, Chintan; Thumar, Sweety; Parmar, Anisha; Jadawala, Kruti
Journal of Dentistry Indonesia Vol. 29, No. 3
Publisher : UI Scholars Hub

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Objective: This study aimed to examine the effects of three distinct file systems with two motion types—rotary and reciprocation—on the development of dentinal microcracks after root canal preparation using a stereomicroscope. Methods: Sixty mandibular molars with a curvature of 30° were decoronated and divided into three groups (Vortex Blue, Mtwo, and ProTaper Next) and two subgroups (rotary and reciprocating motions). The samples were then instrumented with the files, dyed with 1% methylene blue dye, and sectioned horizontally at 3, 6, and 9 mm from the root apex. The dentinal microcracks were inspected using a stereomicroscope at 40× magnification. One-way analysis of variance and post hoc Tukey tests were used to perform statistical analysis. Results: Crack formation was statistically significant at the 6-mm and 9-mm levels from the root apex in both motions (p < 0.05). Among all the file system, Vortex Blue caused the highest dentinal microcracks in both motions at 6 mm from the root apex. Conclusion: The reciprocating motion resulted in fewer dentinal microcracks than the rotary motion. All file systems caused significant dentinal microcracks at the curvature of the root canal during both motions. Dentinal microcrack formation was not significant at the root apex.
Cooling Protocols Impact on Nickel-Titanium Rotary Instruments Cyclic Fatigue Resistance Under Extreme Curvatures and Sodium Hypochlorite Ranparia, Palak Ravjibhai; Joshi, Chintan; Somani, Mona; Patel, Aashray; Desai, Urooj; Prajapati, Janki
Journal of Dentistry Indonesia Vol. 32, No. 2
Publisher : UI Scholars Hub

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Objective: In this work, Hyflex CM, TruNatomy, and Plex V heat-treated nickel titanium rotary instruments were evaluated at body temperature (36 °C ± 1 °C) with and without a cooling protocol to assess the cyclic fatigue resistance. Methods: A 90° curved stainless-steel block was used for cyclic fatigue tests on 60 randomly selected rotary instruments, divided into two groups of 30: body temperature (n = 10) and body temperature with cooling (n = 10). Instruments were further subdivided into 6 groups of 3 different instruments. Cooling protocol group instruments received 5-second spray cooling every 30 seconds, along with continuous 5% sodium hypochlorite. Instrument fractures were recorded via audiovisual methods, inspected under a stereomicroscope, and statistically analyzed. Results: Significant cyclic fatigue resistance was observed in both body temperature and cooling protocol groups in intergroup and intragroup comparisons. Plex V files outperformed others at body temperature, while TruNatomy showed superior cyclic fatigue resistance in the cooling protocol group. Each group displayed expected signs of cyclic fatigue behavior under the stereomicroscope. Conclusion: All three instruments showed comparable cyclic fatigue resistance at body temperature, and the cooling treatment enhanced their resistance. TruNatomy presents a better outcome than other tested files after the cooling protocol.
Co-Authors Desai, Urooj Jadawala, Kruti Modi, Shreya Parmar, Anisha Patel, Aashray Prajapati, Janki Ranparia, Palak Ravjibhai Somani, Mona Thumar, Sweety Vasava, Nupur