Evaluation of microcrack formation after root-end preparation with two different types of ultrasonic retrotips and conventional bur: A stereomicroscopic study

Endodontology

article

Mandviwala, Dilshad Kersi¹  Agrawal, Vineet Suresh¹  Kapoor, Sonali Vinod¹ 

[1] Department of Conservative and Endodontics, M.P. Dental College and Hospital

关键词: Microcracks;    root-end preparation;    ultrasonic retrotips;   

DOI  :  10.4103/endo.endo_42_21

学科分类：材料科学（综合）

来源: Wolters Kluwer Medknow Publications

【 摘 要 】

Introduction:  The aim of this in vitro study is to evaluate and compare the root-end cavities for the presence of microcracks after cavity preparation using two different ultrasonic (US) retrotips and conventional bur. Materials and Method:  Thirty single-rooted teeth were instrumented and obturated. Three millimeters of apices were resected. Retrograde Class I cavities 3 mm deep were prepared on resected surfaces of ten teeth with diamond-coated US retrotip (Group 1), ten teeth with zirconium-nitride-coated US retrotip (Group 2), and ten teeth with conventional bur (Group 3). The root-end surfaces were examined under a stereomicroscope and the resected root surfaces were evaluated for the presence of microcracks on microphotographs. Results:  Statistically significant difference was detected between diamond-coated and zirconium-nitride-coated US retrotips and also significant difference was detected when the same were compared with conventional bur for the presence of microcracks. Conclusion:  Within the limitations of the study, it can be concluded that both zirconium-nitride- and diamond-coated retrotips produce more dentinal crack formation compared to conventional bur, but none of them produce a complete crack. Moreover, the diamond-coated retrotips produce less debris formation and minimal dentinal crack compared to zirconium-nitride-coated retrotips.

【 授权许可】

CC BY-NC-SA