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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing

Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing

Published on: July 3, 2020

Temperature rise during adhesive and composite polymerization with different light-curing sources.

A Pereira Da Silva¹, L Alves Da Cunha, C Pagani

¹Department of Restorative Dentistry, UNESP, São Paulo State University, São José dos Campos, Brazil.

Minerva Stomatologica

|May 27, 2010

Summary

Light-emitting diode (LED) curing units produced less heat than quartz-tungsten halogen (QTH) units when polymerizing dental materials. Both LED and QTH polymerization methods kept tooth temperatures below levels that could cause pulpal damage.

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Area of Science:

Dental Materials Science
Polymerization Technology
Biomaterials

Background:

Dental composite polymerization relies on light curing units.
Understanding temperature rise during polymerization is crucial for preventing pulpal damage.
Different light sources may influence the thermal outcome.

Purpose of the Study:

To evaluate the temperature rise of Single Bond adhesive and two composite resins (Filtek Z350 flow, Filtek Supreme) when polymerized by LED and QTH light sources.
To compare the thermal effects of LED versus QTH polymerization on bovine incisor pulp chambers.
To determine if polymerization methods exceed critical pulpal temperature thresholds.

Main Methods:

Class V cavities were prepared in bovine incisors.
Experimental groups included control, adhesive only, adhesive + composite Z, and adhesive + composite S.
Subgroups were polymerized with either QTH or LED light for 40 seconds, with temperature measured in the pulp chamber.

Main Results:

Both material type and curing unit significantly influenced temperature rise (P<0.00001).
LED polymerization consistently resulted in lower pulp chamber temperatures compared to QTH (P<0.05).
The highest temperature increase was observed with QTH in the control group (0.75°C), while the lowest was with LED and adhesive only (0.15°C).

Conclusions:

QTH light sources induce a greater temperature increase in the tooth compared to LED sources.
Despite temperature variations, neither LED nor QTH polymerization, under the tested conditions, raised pulpal temperatures to levels considered damaging.
The choice of light curing unit can impact the thermal load on the pulp during composite restorations.