Bond strength of bulk fill composite to teeth prepared with Er: YAG laser
Braz. j. oral sci
;
22: e238727, Jan.-Dec. 2023. ilus
Article
in English
| LILACS, BBO
| ID: biblio-1413363
ABSTRACT
Aim:
The present in vitro study aimed to evaluate the bond strength of a bulk fill composite on dentin surfaces prepared with the Er YAG laser.Methods:
Twenty-four permanent third molars were selected and divided into 2 groups CP - Conventional preparation with high-speed handpiece (control) and LA (laser) - Preparation with Er YAG laser. The occlusal surface was removed to expose coronal dentin, which was subsequently prepared with a high-speed handpiece or Er YAG laser (350mJ, 4Hz, 1.5 ml/min water flow). Both groups were restored with Filtek One Bulk Fill (3M ESPE) composite resin. After 24 hours, the samples were evaluated for microtensile bond strength (µTBS), fracture pattern, and scanning electron microscopy (SEM).Results:
The data obtained in the µTBS test were submitted to t-test (α=0.05). The results showed no difference in µTBS when the different types of cavity preparation were compared (ρ=0.091). Fracture patterns revealed the prevalence of cohesive fracture in composite resin in CP (83.3%) and adhesive fracture in LA (92.1%). In the SEM analysis, the LA group demonstrated the presence of gaps between the composite resin and the irradiated dentin surface. The hybrid layer exhibited more regularity with the presence of longer and uniform resin tags in the CP group.Conclusion:
The type of cavity preparation did not influence the values of bulk fill composite resin µTBS to dentin. Fracture patterns and scanning electron microscopy analyses suggested less interference at the adhesive interface in preparations performed using CPSubject(s)
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Adhesiveness
/
Composite Resins
/
Dental Materials
/
Lasers, Solid-State
Type of study:
Risk factors
Language:
English
Journal:
Braz. j. oral sci
Journal subject:
Dentistry
Year:
2023
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Herminio Ometto University Center/BR
/
University of Campinas/BR
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