Abstract
Introduction: There is a high prevalence of enamel caries around brackets due to the young age of the majority of orthodontic patients, and to the difficulty of plaque removal in presence of orthodontic appliances. Recently, protective agents such as bioactive glasses (BGs) were introduced to enhance remineralization and prevent demineralization of tooth structures. This study aimed to assess the shear bond strength (SBS) of resin-modified glass ionomer cement (RMGIC) with addition of 45S5 BG to enhance its remineralizing potential using two conventional methods. Material and methods: This in-vitro experimental study evaluated three groups (n=20) of orthodontic brackets bonded to enamel using Transbond XT (group 1), light-cure RMGIC (group 2) and RMGIC with BG added (group 3). Samples underwent 7000 thermal cycles and their SBS was measured. The adhesive remnant index (ARI) score was also determined. Quantitative data were analyzed using one-way ANOVA while qualitative data were analyzed using a chi-square test. Discussion: The results showed no significant difference in SBS between study groups, however the ARI scores were significantly different among the groups. The RMGIC group showed the highest ARI while RMGIC doped with BG showed the lowest ARI score. Conclusion: Addition of 30% w/v 45S5 BG to RMGIC does not cause a significant change in SBS of orthodontic brackets bonded to enamel, while resulting in less amount of luting agent remnants on the enamel surface after debonding.
Highlights
There is a high prevalence of enamel caries around brackets due to the young age of the majority of orthodontic patients, and to the difficulty of plaque removal in presence of orthodontic appliances
It means that the use of resin-modified glass ionomer cement (RMGIC) doped with bioactive glasses (BGs) can show a clinical behavior similar to that of conventional RMGIC
The results showed a significant effect of the method of application and type of luting agent on the adhesive remnant index (ARI) score (p
Summary
There is a high prevalence of enamel caries around brackets due to the young age of the majority of orthodontic patients, and to the difficulty of plaque removal in presence of orthodontic appliances. Glass ionomer cement (GIC) was first introduced by Kent & Wilson as a tooth-colored restorative material for esthetic dental restorations.[2] GICs are biocompatible and can chemically bond to dental structure They release fluoride and enable ion exchange with the adjacent mineral tissues. They are considered as a material with remineralization potential.[2] Despite the afore-mentioned advantages, clinical and laboratory evidence shows that the conventional GICs do not have adequate strength for long-term efficient bonding of orthodontic brackets to enamel.[3] In the recent years, resin modified glass ionomer cements (RMGICs) were introduced to the market in order to overcome some of the limitations of conventional GICs. RMGICs contain photo-initiators and are polymerized by light. RMGICs have become increasingly popular for several dental applications due to lower technical sensitivity, higher adhesive and cohesive strength and significant fluoride release potential compared to the conventional GICs.[5]
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