Background: Anterior bite planes are bite-raising appliances used for deep bite correction. However, muscle responses to anterior bite planes of different harnesses may vary. Objectives:To prospectively evaluate masticatory muscle activity, muscle balance and maximum bite force (MBF) responses to anterior bite planes fabricated from acrylic resin (ABP) or bi-laminate thermoplastic (TBP) over 6 months in children with a deep bite.Methods: Sixty-six children were randomly assigned to the ABP, TBP or untreated control groups. Masticatory muscle activity, activity index (AC) and percentage overlapping coefficient (POC) were assessed by surface electromyography; MBF, using a custom-made bite force sensor. Data were collected before, immediately after appliance insertion and after 2 weeks and 1, 3 and 6 months of treatment. Within-and between-group differences were analysed using the one-way ANOVA/Kruskal-Wallis and Mann-Whitney U tests (α = .05); Friedman's tests were used to assess withingroup differences over time (α = .08).Results: At rest, no dependent variables changed throughout the study. At maximum clenching, masticatory muscle activity immediately dropped significantly but returned to baseline values and was equal to the control group at 1-3 months. The ABP group had significantly lower masseter activity and AC than the TBP group after insertion.Neither POC nor MBF were significantly different within or between groups. Conclusion:Masticatory muscle activity reduced after anterior bite plane insertion but returned to baseline after 1-3 months. Masseter activity decreased significantly more in the ABP group than TBP group. Neither appliance significantly affected POC or MBF.

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Bilateral Class II intermaxillary elastics (CII elastics) have been commonly used in orthodontics to assist the correction of Class II dental relationships and to enhance the anchorage units. The elastics are applied directly between the posterior lower jaw and anterior upper jaw to generate a force ranging from 1.5-6 oz or around 42.5-170 g per side. 1 The forces generated by CII elastics not only cause tooth movement, but also mandibular movement. 2 Previous studies reported upward forward movement of the mandibular first molars,

Introduction:Medications have been widely used in the dental patients for the treatment of their systemic diseases. In fact, those drugs have some side-effects to many organs and also the oral cavity. The aim of our study was to investigate the relationship between medications and oral lichen planus (OLP), oral lichenoid drug reaction (OLDR) and glossitis (GT) in Thai patients.