Abstract
The aim of the present study was to evaluate the in vitro caries preventive effect of fluoridated orthodontic resins under pH cycling with two types of acid demineralizing saliva. Brackets were bonded to 60 bovine incisors, using either Transbond Plus Color Change (n=30) or Orthodontic Fill Magic (n=30) orthodontic resins. Each group of resin was divided into 3 subgroups (n=10): immersion in remineralizing artificial saliva for 14 days, pH cycling with high cariogenic challenge in acid saliva with pH 5.5, and acid saliva with pH 4.5. After 14 days of pH cycling, the caries preventive effect on the development of white spot lesion was evaluated considering the presence of inhibition zones to white spot lesions using two scores: 0= absence and 1= presence. Kruskal Wallis and Mann-Whitney tests (a=0.05) were used. Formation of white spot lesions was observed only under pH cycling using acid saliva with pH 4.5; with Transbond Plus Color Change being significantly more effective (p<0.05) in preventing the appearance of white spot lesions effect than Orthodontic Fill Magic. The acidity of the demineralizing solution influenced the formation of white spot lesions around orthodontic brackets under highly cariogenic conditions. Transbond Plus Color Change resin presented higher caries preventive effect than Orthodontic Fill Magic.
Highlights
Mechanical characteristics of orthodontic materials used to bond devices are frequently investigated in the literature [1,2,3,4]
Prevention of white spot lesions (WSL) has been the main purpose of a number of studies that use orthodontic materials with this intrinsic preventive capacity [5,6,7]
Groups of 10 specimens of each resin were formed according to the a) immersion in artificial remineralizing saliva; b) pH cycling with high cariogenic challenge in acid saliva with pH 5.5; c) pH cycling with high cariogenic challenge in acid saliva with pH 4.5
Summary
Mechanical characteristics of orthodontic materials used to bond devices are frequently investigated in the literature [1,2,3,4]. Despite the worldwide decrease of dental caries prevalence, the development of white spot lesions (WSL) around orthodontic brackets continues to be a problem, especially because orthodontic devices facilitate biofilm the retention of biofilm, frequently causing gingivitis [5]. The most important characteristic of glass ionomer cements is their anticariogenic property, due to their capacity to release and store fluoride. The disadvantage of glass ionomer cements for orthodontic use is their low bond strength to dental substrate [8]. To solve this problem, materials with high bond strength associated with fluoride-releasing capacity, such as fluoridated composite resins, have been developed [7]
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