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The electromyographic and cephalometric analyses after maxillary expansion

Open Journal of Stomatology 2012年第4期2卷 334-339页

作者： Patrícia Maria Monteiro Simone Cecilio Hallak Regalo janete cinira bregagnolo Maria Bernadete Sasso Stuani Department of Pediatric Clinics Preventive and Community DentistryDivision of OrthodonticsDental School of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil Department of Morphology Stomatology and PhysiologyDental School of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil

The purpose of this study was to evaluate the electromyographic (EMG) activity of the masseter and temporalis muscles and the skeletal and dental behavior of children having slow maxillary expansion with a quadhelix appliance. The study sample consisted of 30 children (mean age = 7 years 4 months;17 girls/13 boys) diagnosed with a unilateral posterior crossbite. Lateral cephalometric tracing and EMG analyses were carried out before orthodontic treatment (T1) and 1 month after removal of the appliance (T2). The EMG activity of the masseter and temporalis muscles was analyzed in two clinical situations: at muscular rest and during habitual chewing. Differences in the measurements were evaluated by using paired t tests. Maxillary expansion with the quadhelix appliance did not promote significant anteroposterior and vertical skeletal alterations. Among the cephalometric variables related to dental pattern, only 1-ANS-PNS values presented a significant increase at T2. At muscular rest, EMG analysis indicated a significant increase in the activity of the temporalis muscle. During habitual chewing, EMG activity decreased significantly for both evaluated muscles after removal of the quadhelix appliance. These alterations suggest an adaptation and reprogramming of the musculature to the new occlusal condition.

关键词： Electromyography Masticatory Muscles Malocclusion Orthodontics Interceptive

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The effect of chlorhexidine on plaque index and mutans streptococci in orthodontic patients:A pilot study

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Open Journal of Stomatology 2013年第6期3卷 323-328页

作者： Gisele Faria Milton Santamaria Jr. Bianca Mota dos Santos Izabel Yoko Ito janete cinira bregagnolo Maria Bernadete Sasso Stuani Department of Restorative Dentistry School of Dentistry of AraraquaraUniversity of the State of Sao Paulo(UNESP)AraraquaraBrazil Department of Pediatric Clinics Preventive and Social DentistrySchool of Dentistry of Ribeirao PretoUniversity of Sao Paulo(USP)Ribeirao PretoBrazil Private Practice AracajuBrazil Department of Clinical Analysis Toxicology and BromatologySchool of Pharmaceutical Sciences of Ribeirao PretoUniversity of Sao Paulo(USP)Ribeirao PretoBrazil

Aim: The purpose of this study was to assess chlorhexidine effects on plaque index and salivary levels of mutans streptococci (MS) when used as the immersion solution for removable orthodontic appliances and added to their acrylic resin composition. Methods: Forty-five patients (6 to 12 years old) were randomly assigned into three groups with 15 patients each. Group I (control)—without orthodontic appliances disinfection;Group II—removable orthodontic appliances which had been immersed in 0.12% chlorhexidine digluconate overnight (8 hours), and Group III—orthodontic appliances in which 0.12% chlorhexidine digluconate solution had been incorporated into their resin composition. Saliva was collected for quantification of MS and evaluation of plaque index was performed before and after installation of orthodontic appliance at 0, 2, 4, 6, 8, and 10 weeks. Data were analyzed by using analysis of variance. Results: Number of MS colonies in saliva and plaque index showed no statistically differences among groups at the different periods (p > 0.05). Conclusions: It could be concluded that chlorhexidine incorporation into the acrylic resin of removable orthodontic appliances at 0.12% concentration and immersion of the appliance into 0.12% chlorhexidine solution were not effective in reducing plaque index and the number of MS in saliva.

关键词： Chlorhexidine Self-Polymerising Acrylic Removable Orthodontic Appliances Mutans Streptococci Plaque Index

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