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Fibre post removal using ultrasonic tips: A comparative in vitro study using different protocols.

Ricardo Honda¹, Lauter E Pelepenko¹, Mabelle F Monteiro²

¹Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas, Piracicaba, São Paulo, Brazil.

Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc

|October 28, 2024

Summary

This summary is machine-generated.

Ultrasonic removal of glass fibre posts (GFPs) using continuous activation for over 20 seconds without cooling can increase root temperature and cause significant dentin loss. Shorter activation times are recommended for safer post removal.

Keywords:

endodontics fiberglass reinforced polymers fibre post removal ultrasonics x‐ray micro‐computed tomography

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Area of Science:

Endodontics
Dental Materials Science

Background:

Glass fibre posts (GFPs) are widely used in endodontic restorations.
Effective and safe removal of GFPs is crucial for retreatment.
Ultrasonic devices are commonly employed for post removal.

Purpose of the Study:

To evaluate the efficacy and safety of different ultrasonic activation protocols for glass fibre post removal.
To assess the impact of cooling and activation duration on removal time, temperature increase, residual material, and dentin loss.

Main Methods:

Thirty-six endodontically treated teeth with cemented 10-mm GFPs were used.
Three ultrasonic removal protocols were tested: 20s with cooling, 20s without cooling, and 40s without cooling.
Removal time, external root surface temperature, residual material, and dentin loss were measured.
Micro-computed tomography and ANOVA were used for data analysis.

Main Results:

No significant differences in removal time or residual material were found between protocols.
Continuous 40s ultrasonic activation without cooling resulted in the highest root surface temperatures, particularly in the apical region.
The 40s protocol without cooling also led to significantly greater dentin loss compared to other groups.

Conclusions:

Ultrasonic activation time for glass fibre post removal should not exceed 20 seconds continuously, especially without cooling.
Prolonged activation increases the risk of thermal damage and excessive dentin loss.
Careful consideration of ultrasonic parameters is essential for safe and effective post removal procedures.