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Oral Radiology
Published in: Oral Radiology 4/2023

31-03-2023 | Original Article

The effect of ultrasonic access cavity preparation on dentinal inner walls: a micro-CT study on cadaveric samples

Published in: Oral Radiology | Issue 4/2023

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Abstract

Objective

The objective of this study is to evaluate the occurrence of coronal dentinal micro-cracks after access cavity refinement using high-speed burs and ultrasonic tips by means of micro-computed tomography (micro-CT) analysis.

Methods

In this study, 18 mandibular cadaveric incisors were divided into two groups according to the protocol of the preparation of the conventional access cavity. The diamond bur 802 # 12 was used until the perforation of the pulp roof. Then, the Endo-Z bur was used for the group #1 and the ultrasonic tip Start-X # 1 for the group #2 to finish and refine the access cavity. The preparation time of each access cavity has been recorded. The teeth underwent a micro-CT scan before and after the preparation of the access cavity. Fisher's exact test, the Chi-square test, the Kolmogorov–Smirnov test, the Mann–Whitney test, and the Student's test were used for statistical evaluation.

Results

The percentage of teeth with new micro-cracks is not significantly different between the two groups (-p-value < 0.5). The number of newly formed micro-cracks and extension size were not significantly different between the two groups. The direction of extension of the micro- cracks was occluso-apical. The average duration of the access cavity is significantly smaller with the Endo-Z system (-p- value < 0.001). The roughness of walls surfaces has no statistically difference between the two groups.

Conclusion

The use of ultrasound, although slower, is considered safe in the creation of dentinal micro-cracks, in the preparation of the access cavity.
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Metadata
Title
The effect of ultrasonic access cavity preparation on dentinal inner walls: a micro-CT study on cadaveric samples
Publication date
31-03-2023
Published in
Oral Radiology / Issue 4/2023
Print ISSN: 0911-6028
Electronic ISSN: 1613-9674
DOI
https://doi.org/10.1007/s11282-023-00680-z

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