Gregory S Antonarakis; Stavros Kiliaridis
Abstract
Large variation exists amongst patients with regards to treatment outcomes following functional appliance treatment in growing children. Various factors have been assessed with regard to this variation, but evidence is scarce. Recent studies suggest that the initial condition of the masticatory muscles ...
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Large variation exists amongst patients with regards to treatment outcomes following functional appliance treatment in growing children. Various factors have been assessed with regard to this variation, but evidence is scarce. Recent studies suggest that the initial condition of the masticatory muscles may be one of the factors that influences treatment and post-treatment functional appliance outcomes. Children with weaker masticatory muscles show greater dentoalveolar change, as witnessed by incisor compensation and molar movement. Following functional appliance treatment, children who show greater dentoalveolar treatment change may also be those with a more likely post-treatment sagittal relapse. The gonial angle may also be a variable determining treatment outcomes with functional appliances in that more incisor compensation and a greater likelihood for relapse is evident in those with a more open gonial angle. The gonial process is the site of muscle attachment for the masseter and median pterygoid muscles, and the thickness and force of these muscles can have an effect on the process and its contribution to mandibular morphology. By extrapolation, cephalometric analysis of the gonial angle can perhaps provide insight into the amount of incisor proclination expected to be observed during and after functional appliance treatment.
Susan Sadeghian
Abstract
Aim: The purpose of this study was toevaluate the relationship between the ultrasonographic thickness of masseter muscle and the width of dental arches.Materials and Methods: The sample comprised of 44 persons (22males, 22females), who did not undergo orthodontic treatment and they had at least 28 teeth ...
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Aim: The purpose of this study was toevaluate the relationship between the ultrasonographic thickness of masseter muscle and the width of dental arches.Materials and Methods: The sample comprised of 44 persons (22males, 22females), who did not undergo orthodontic treatment and they had at least 28 teeth with CL 1 occlusion. The thickness of the masseter muscle was measured ultrasonografically with the muscles both in relaxation and under contraction. Maxillary and madibular inter-molar and inter-canine width were measured with an digital caliper for the distance between the palatal surfaces of the permanent first molar and cingulumes of canines.Results: There was a significant association between mandibular inter-molar width and sex (PV=0.037). Masseter muscle thickness in both sides and either in relaxation or contraction showed a direct significant association with sex (PV=0.001). Maxillary inter-molar and inter- canine and mandibular inter-canine width showed a direct significant association with masseter thickness during contraction in tight side (PV=0.037), whereas in relaxation no statistically significant relationship was found (PV =0.07).Conclusions: The fmdings of this study indicated that the thickness and functional capacity of the masseter muscle may be considered as one of the factors influencing the width of the maxillary dental arch and inter canine mandibular dental arch width.
