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Pulpal Temperature Variances During Step-by-step Adhesive Restorative Procedure Using Three Different High-irradiance
R K Nakagawa1, H H Araújo de Oliveira2, L G Abreu3
1Rodrigo Keigo Nakagawa, DDS, MSc, PhD, postdoctoral researcher, Department of Restorative Dentistry, Federal University of Minas Gerais, Bel o Horizonte, Brazil.
Operative Dentistry
|January 5, 2024
Summary
Pulp temperature (PT) during dental restorations is influenced by light-curing units (LCUs) and resin composite shade, not thickness. All tested LCUs are safe, but shade impacts heat absorption.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Pulp tissue temperature rise during dental procedures is a concern.
- Heat generation is linked to light-curing units (LCUs) and restorative techniques.
Purpose of the Study:
- To compare pulp temperature (PT) changes induced by three LCUs.
- To evaluate the effect of resin composite shade and thickness on PT.
- To assess heat dissipation during simulated intraoral conditions.
Main Methods:
- Utilized a bovine incisor model simulating pulp fluid circulation and intraoral temperature.
- Measured external and internal PT during simulated restorative steps.
- Compared temperature variations using three LCUs (Valo, Elipar, Radii Cal) with different resin composite shades (A1, A4) and increments.
Main Results:
- A significant PT increase occurred during light curing with the Valo LCU compared to Elipar and Radii Cal.
- No significant PT difference was observed based on resin composite thickness.
- Resin composite shade A1 resulted in higher temperature variations than shade A4.
- No tested LCU exceeded the pulp tolerance limit (5.5°C increase).
Conclusions:
- Microcirculation and air-water flux effectively dissipate heat during dental procedures.
- All three LCUs are clinically safe regarding pulp temperature.
- Resin composite shade significantly influences irradiance absorption and pulp temperature variance.
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