Background: Molar-incisor hypomineralisation (MIH) is a qualitative enamel defect. Aim: To investigate the low-level laser therapy (LLLT) associated with fluoride varnish for the desensitisation of teeth with MIH. Design: A randomised clinical trial was conducted with 66 children, randomly allocated to the treatments: laser (L); fluoride varnish (FV); and laser + fluoride varnish (L + FV). The participants in the L group underwent two sessions of LLLT (48-hour interval). The FV group received four applications of varnish at one-week intervals. The L + FV underwent two sessions of LLLT and four applications of varnish. Prior to each session and one month after the onset of treatment, tooth sensitivity and its magnitude were evaluated. Intra-and inter-group comparisons were performed (α = 5%). Results: A significant reduction in the mean sensitivity score was found over time in all groups. After the final treatment, a significant difference was found between the L and L + FV groups (P = .011), with a lower score in the L + FV group (0.09), whereas no difference was found between the FV and L + FV groups (P = .095). Conclusions: Fluoride varnish and the combination of treatments (L + FV) had greater desensitising action on teeth with MIH. Laser therapy demonstrated an immediate desensitising effect, whereas fluoride varnish had a late-onset effect. K E Y W O R D S child, dentine sensitivity, fluoride, topical, low-level laser light therapy, tooth demineralisation 324 | MUNIZ et al.
OBJECTIVE: To compare shear bond strength of different direct bonding techniques of
orthodontic brackets to acrylic resin surfaces. METHODS: The sample comprised 64 discs of chemically activated acrylic resin (CAAR)
randomly divided into four groups: discs in group 1 were bonded by means of
light-cured composite resin (conventional adhesive); discs in group 2 had surfaces
roughened with a diamond bur followed by conventional direct bonding by means of
light-cured composite resin; discs in group 3 were bonded by means of CAAR
(alternative adhesive); and discs in group 4 had surfaces roughened with a diamond
bur followed by direct bonding by means of CAAR. Shear bond strength values were
determined after 24 hours by means of a universal testing machine at a speed of
0.5 mm/min, and compared by analysis of variance followed by post-hoc Tukey test.
Adhesive remnant index (ARI) was measured and compared among groups by means of
Kruskal-Wallis and Dunn tests. RESULTS: Groups 3 and 4 had significantly greater shear bond strength values in comparison
to groups 1 and 2. Groups 3 and 4 yielded similar results. Group 2 showed better
results when compared to group 1. In ARI analyses, groups 1 and 2 predominantly
exhibited a score equal to 0, whereas groups 3 and 4 predominantly exhibited a
score equal to 3. CONCLUSIONS: Direct bonding of brackets to acrylic resin surfaces using CAAR yielded better
results than light-cured composite resin. Surface preparation with diamond bur
only increased shear bond strength in group 2.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.