Abstract
Bonding failure is a clinical issue frequently encountered in orthodontic practice. The aim of this study was to evaluate enamel pretreatment both in vitro and clinically using agents with different RDA values before brackets’ bonding, to assess if RDA can affect the Shear Bond Strength (SBS), Adhesive Remnant Index (ARI) and clinical failure rate of orthodontic brackets. For the in vitro study, 220 bovine teeth were pretreated with agents with different RDA values. Subsequently, brackets were bonded. For the clinical study, 20 patients underwent bonding of 20 brackets each with a split-mouth design. Low and high RDA toothpastes were used for enamel pretreatment. SBS, ARI and failures were recorded. Higher SBS values were found for teeth pretreated with lower RDA agents; conversely, lower SBS values were found for teeth pretreated with higher RDA agents (p < 0.05). For high ARI values, RDA increased too (p > 0.05). In the clinical study, a significantly lower failure rate was reported for teeth pretreated with low RDA toothpaste (2.5% in low RDA group, 7.0% in high RDA group; p < 0.05). No significant differences were assessed comparing the two dental arches and anterior and posterior sites. Enamel pretreatment with low RDA toothpastes could increase brackets’ survival rate. Further in vitro and clinical studies would be welcomed to confirm these findings.
Highlights
Introduction published maps and institutional affilThe aims of orthodontic therapy are the improvement of oral health conditions and, as a consequence, better facial aesthetics, which are the reasons of the increasing request of treatment by adults [1]
A common but unpleasant occurrence is the possibility of brackets’ detachment, which can cause the lengthening of treatment time and give discomfort to the patient [7,8,9,10,11]
A Pearson correlation coefficient was calculated to determine whether there was any correlation between Shear Bond Strength (SBS) and Relative Dentin Abrasivity (RDA) values
Summary
The aims of orthodontic therapy are the improvement of oral health conditions and, as a consequence, better facial aesthetics, which are the reasons of the increasing request of treatment by adults [1]. Focusing on labial fixed appliances, the main discomforting situations consist of oral mucosal lesions, such as erosions, desquamations and ulcerations caused by brackets and archwires [4,5]. Breakages of wires and brackets detachments can occur [5]; the problem is relevant as 61% of recalled patients from all the considered cohorts reported a breakage of a fixed orthodontic appliance [6]. A common but unpleasant occurrence is the possibility of brackets’ detachment, which can cause the lengthening of treatment time and give discomfort to the patient [7,8,9,10,11]. A reasonable clinical failure rate should be below 10%, iations
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