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Published on: December 20, 2024
Properties of composite materials used for bracket bonding
Ana Caroline Silva Gama1, André Guaraci de Vito Moraes, Lilyan Cardoso Yamasaki
1Department of Dentistry 1, Dental School, Federal University of Maranhão, São Luis, MA, Brazil.
Brazilian Dental Journal
|August 24, 2013
Summary
This study compared an orthodontic composite to two flowable composites. The orthodontic composite demonstrated superior shear bond strength and flexural modulus, with lower contraction stress, making it ideal for bracket bonding.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Orthodontic Research
Background:
- Flowable composites are increasingly used in orthodontics, but their mechanical properties and performance compared to dedicated orthodontic composites require thorough evaluation.
- Understanding material properties like bond strength, flexural strength, flexural modulus, and contraction stress is crucial for predicting clinical performance and longevity.
Purpose of the Study:
- To conduct an in vitro comparative analysis of shear bond strength to enamel, flexural strength, flexural modulus, and contraction stress.
- To evaluate three specific composite materials: one orthodontic composite (Transbond XT) and two flowable composites (Filtek Z-350 flow, Opallis flow).
Main Methods:
- Shear bond strength was tested using orthodontic brackets bonded to human maxillary premolars.
- Flexural strength and modulus were determined using standardized specimen fabrication and flexural testing.
- Contraction stress was measured using cylindrical specimens and an extensometer.
- Statistical analysis was performed using one-way ANOVA and Tukey's test at a significance level of α=0.05.
Main Results:
- The orthodontic composite (Transbond XT) exhibited significantly higher shear bond strength to enamel compared to the flowable composites.
- No significant differences in flexural strength were observed among the tested composites.
- Transbond XT showed a significantly higher flexural modulus than both flowable composites.
- The orthodontic composite presented significantly lower contraction stress values than the flowable composites.
Conclusions:
- The light-activated orthodontic composite material demonstrated superior performance in terms of higher flexural modulus and shear bond strength.
- The orthodontic composite also exhibited lower contraction stress compared to the evaluated flowable composites.
- These findings suggest that dedicated orthodontic composites may offer advantages over flowable composites for bracket bonding applications due to their mechanical properties and stress behavior.
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