Abstract
Abstract Objective To evaluate the in vitro and in situ anti-cariogenic potential and bond strength to enamel of materials containing fluoride (F), used for bracket bonding: Transbond XT (GT, negative control), Transbond Plus Color Change (GTF), Transbond-Self-Etching Primer (GSAF) and Vitremer (GV, positive control). Material and method In the in vitro study, the specimens were premolars with bonded brackets (n=12/group). After pH cycling, the F release, bond strength, fracture mode and presence of white spot lesions were assessed. In the in situ study, the specimens were enamel fragments with bonded brackets (n=12/group). Twelve volunteers wore palatal appliances in 4 phases, with cariogenic challenge. Bond strength, fracture mode and change in surface hardness (%SH) were determined. Result Relative to the in vitro study, F release (ppm) was: GT=0.257±0.068c; GTF=0.634±0.100b; GSAF=0.630±0.067b; GV=2.796±1.414a. Only GV showed no white spot lesions. Bond strength values (MPa) were GT=7.62±7.18a; GTF=5.15±6.91ab; GSAF=3.42±2.97bc; GV=2.87±2.09c. Adhesive fracture was the most frequent type, except for GTF. In the in situ study, %SH was: GT=-56.0±18.3a; GTF=-57.6±11.9a; GSAF=-57.1±11.3a; GV=-52.4±25.8a. Bond strength values were GT=9.5±4.4a; GTF=11.1±5.9a; GSAF=13.2± 6.6a; GV=6.6±4.0a. Cohesive fracture in material was the most frequent type, except for GTF. Conclusion Vitremer (GV) showed the highest anti-cariogenic potential in the in vitro study. However, it was not confirmed by the in situ study. Regarding bond strength values from the in situ study, all materials were shown to be adequate for clinical practice.
Highlights
MATERIAL AND METHODNowadays, the prevention of dental caries is a primary objective in all areas of Dentistry
The present study aimed to evaluate these materials in terms of their anti-cariogenic potential and effectiveness in bonding brackets, in both controlled conditions and in more clinically relevant conditions
Given the results of the in vitro study, it was expected that the anti-cariogenic potential of group GTF. Conclusão: Vitremer (GV) would be corroborated in the in situ study, and it was suspected that groups GTF and GSAF would demonstrate some effect on the control of mineral loss, as a more sensitive methodology - namely surface hardness - was used
Summary
The prevention of dental caries is a primary objective in all areas of Dentistry. To evaluate shear bond strength and fracture type analysis, after the intraoral appliances had been used, the blocks were removed and embedded in chemically-activated acrylic resin (JET, Clássico Indústria Brasileira, Campo Limpo Paulista, SP, Brazil) within a PVC matrix (Tigre, Joinville, SC, Brazil) to obtain the specimens. These were placed on the universal testing machine (EMIC - Equipamentos e Sistemas de Ensaio Ltda., São José dos Pinhais, PR, Brazil) with a chisel-type tip at a speed of 0.5 mm/min and a load cell of 200 Kgf, until the bracket-enamel bond ruptured.
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