AI Article Synopsis
- This study investigates how different ultrasonic root-end preparation tips (diamond vs. zirconium nitride-coated) affect the formation and growth of microcracks in tooth roots during endodontic surgery.
- Twenty-eight premolar teeth were tested for preexisting microcracks, prepared, and then scanned to measure any new cracks that developed after using the ultrasonic tips.
- The results showed a slight increase in cracks with both types of tips, but the differences were not statistically significant, indicating that both tips similarly contribute to crack formation when preexisting cracks are present.
Article Abstract
Background: Root-end preparation during surgical endodontics may produce dentinal microcrack formation and/or propagation, leading to vertical root fractures.
Aim: This study aimed to evaluate and compare the microcrack formation and propagation during ultrasonic root-end cavity preparation, with diamond- and zirconium nitride-coated tips using micro-computed tomography (CT).
Methodology: Twenty-eight extracted, mature, free-of-defect, mandibular premolars were decoronated and micro-CT scanned for the presence of preexisting microcracks. Samples were prepared till F4, were obturated, and were re-scanned to determine an increase in the number of microcracks. After 3 mm of root-end resection, the samples were randomly divided for ultrasonic root-end preparation into Group 1 ( = 12): preparation was done with ProUltra Surg tip, Group 2 ( = 12): preparation was done with KiS tip, and Group 3 ( = 4): no preparation was done. The samples were rescanned, and data collected were analyzed using ANOVA and Student's -test. The level of significance was set at 5%.
Results: Preexisting microcracks were observed in few samples. The mean percentage number increase of microcracks after root-end preparation in ProUltra Surg group was 1.25 and in KiS group, it was 0.5. The difference in mean percentage increase for the number of microcracks after root-end cavity preparation using ProUltra Surg tip and KiS tip was 0.75. However, this difference was not statistically significant ( = 0.34).
Conclusion: Both diamond- and zirconium nitride-coated ultrasonic tips resulted in more number of dentinal crack formation and propagation when preexisting cracks were present.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6873600 | PMC |
| http://dx.doi.org/10.4103/JCD.JCD_67_19 | DOI Listing |
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