Bonding brackets on white spot lesions pretreated by means of two methods

Abstract

Objective: The aim of this study was to evaluate the shear bond strength (SBS) of brackets bonded to demineralized enamel pretreated with low viscosity Icon Infiltrant resin (DMG) and glass ionomer cement (Clinpro XT Varnish, 3M Unitek) with and without aging. Methods: A total of 75 bovine enamel specimens were allocated into five groups (n = 15). Group 1 was the control group in which the enamel surface was not demineralized. In the other four groups, the surfaces were submitted to cariogenic challenge and white spot lesions were treated. Groups 2 and 3 were treated with Icon Infiltrant resin; Groups 4 and 5, with Clinpro XT Varnish. After treatment, Groups 3 and 5 were artificially aged. Brackets were bonded with Transbond XT adhesive system and SBS was evaluated by means of a universal testing machine. Statistical analysis was performed by one-way analysis of variance followed by Tukey post-hoc test. Results: All groups tested presented shear bond strengths similar to or higher than the control group. Specimens of Group 4 had significantly higher shear bond strength values (p < 0.05) than the others. Conclusion: Pretreatment of white spot lesions, with or without aging, did not decrease the SBS of brackets.

One Year Clinical Evaluation of White Spot Lesions with Newly Introduced Resin Modified Glass-Ionomer in Comparison to Resin Infiltration in Anterior Teeth: a split mouth randomized controlled clinical trial from Egypt

“…Clinpro-xt, non-statistical significant change in lightness for upper and lower anterior teeth occurred, this could be due to the erosion protocol for the white spot lesion by application of 37% of phosphoric acid (15 s) that incapable of removing the outermost hypermineralized layer to allow penetration of the material and the thick consistency of the material due to presence of (Bis-GMA network) produced thicker layers leaving voids inside the lesion does not match the refractive index of the sound enamel. These explanations meet the same results found with Meyer-Lueckel et al [32] , Vianna et al [10] The detection of demineralization degree using quantitative light fluorescence method is much more sensitive than direct visualization. It was evident that using this method is useful clinical adjunct in diagnosis and follow up monitoring in orthodontic patients.…”

“…The most recent modality is based on the application of unfilled, low viscosity infiltrate resin to the affected lesion. [10] It has the advantage of preventing further lesion progression under demineralizing conditions compared to no treatment. [11] So, it fills the gap between prevention and restoration that is found in many in-vitro studies.…”

“…Recently introduced highly filled, resin-modified glass ionomer-based lightcurable fluoride varnish (Clinpro™ XT), the manufacture claims that it enhances the white spot lesion and provides a site-specific fluoride releasing coating for more than 6 months while traditional varnish sustains only four months. [10] In the current literature, no Randomized Controlled Trials (RCTs) have evaluated the clinical performance of resin modified glass ionomer fluoride varnish versus resin infiltration, regarding degree of demineralization and esthetic behavior. This study would in turn affect selection of suitable material that consequently would benefit in treating the white spot lesions of postorthodontic patients.…”

Evaluation of dental enamel color after fixed orthodontic therapy using two types of protectors to prevent white spot lesions (A prospective clinical study)

“…Both protective materials used in groups 2 and 3 were used according to manufacturer protocol as shown in table (1). (10) Table 1: Groups, material and application protocol used in the current study.…”

“…This study will focus on the icon infiltrant resin (DMG) and glass ionomer cement (clinpro XT varnish, 3M Unitek) because it has been shown that the use of these products before bracket bonding would not interfere with or reduce the shear bond strength. (10) So it is wise to use one of these products before bonding particularly for risky patients who have incipient caries, history of WSL, non-cavity lesion and the unbalanced mouth with repeated acid attacks, so the demineralization process is faster than remineralization. (11) Patients nowadays are not satisfied by correction of malocclusion only, but the color of the teeth plays an important role in the esthetic outcome.…”