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

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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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Data Availability

Data and all materials related to this study is available by request to the corresponding author.

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Acknowledgements

This work received a grant from the research committee of the University of Turin, financial support and sponsorship.

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Authors and Affiliations

  1. Department of Endodontics, Saint Joseph University of Beirut, Beirut, Lebanon

    C. Zogheib & R. Roumi

  2. Department of Surgical Sciences, Dental School, Endodontics, University of Turin, Turin, Italy

    A. Baldi, D. Pasqualini, E. Berutti & M. Alovisi

  3. Politecnico di Torino, Turin, Italy

    P. Palopoli

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  1. C. Zogheib
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  2. R. Roumi
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  3. A. Baldi
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  4. P. Palopoli
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Correspondence to P. Palopoli.

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Zogheib, C., Roumi, R., Baldi, A. et al. The effect of ultrasonic access cavity preparation on dentinal inner walls: a micro-CT study on cadaveric samples. Oral Radiol 39, 639–645 (2023). https://doi.org/10.1007/s11282-023-00680-z

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  • DOI: https://doi.org/10.1007/s11282-023-00680-z

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