Materials and methods: Fourty five single rooted teeth were used for this study. Fifteen teeth were unprepared as the negative control group, and the remaining 30 teeth were assigned to two root canal shaping groups. The root canal shaping procedure was performed to the full working length with: Protaper Gold (Group 1), Mani Silk (Group 2). All the specimens were sectioned perpendicular to the long axis at 3, 6, and 9 mm and were observed under a digital stereomicroscope at X25 magnification. The absence/presence of cracks was recorded, and the data were analysed with a chi-square test. The significance level was set at 5%.

Result: Protaper Gold was having more number of cracks followed by Mani Silk. Between Protaper Gold and Mani Silk group the difference was statistically insignificant (P>0.05).

Conclusion: Mani Silk tend to produce less number of cracks as compared to Protaper Gold.