Ib Leth Nielsen
Abstract
Early treatment of Class II, Div. 1 malocclusion is a much debated approach and some evidenced based studies using a single appliance has concluded that this approach was mostly not worthwhile. This article will discuss the pros and cons of early treatment with functional appliances and present guidelines ...
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Early treatment of Class II, Div. 1 malocclusion is a much debated approach and some evidenced based studies using a single appliance has concluded that this approach was mostly not worthwhile. This article will discuss the pros and cons of early treatment with functional appliances and present guidelines for early treatment. The role of facial growth and dentoalveolar development, and growth intensity will be discussed as they relate to treatment outcome.
Massoud Seifi; Majid Bargrizan; Nafiseh Memar-Kermani; Elaheh VAhid-Dastjerdi
Abstract
Aims: Assessment of skeletal and dentoalveolar changes in class II division 1 patients after treatment with Seifi's functional appliance in dental school of Shahid Beheshti. University in 2007-2008. Methods: In this before- after clinical trial study, Seifi's functional appliance was used for ...
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Aims: Assessment of skeletal and dentoalveolar changes in class II division 1 patients after treatment with Seifi's functional appliance in dental school of Shahid Beheshti. University in 2007-2008. Methods: In this before- after clinical trial study, Seifi's functional appliance was used for 15 patients (mean age: 9.84±1.24 year) with class II division I deep bite maloccIusion. All of them had mandibular deficiency and ANB>4 degrees, OJ and OB>4mm. Lateral cephalometric and panoramic radiographs, primary impression via alginate, intraoral and facial photographs were taken at the beginning of the study and after 10.2±2.01 months. The results were compared to each other. The device was two pieces and consisted of an acrylic cap on mandibular incisors and a mid palatal screw and a vertical plate on the upper jaw.Results: In sagittal dimension ANB, 1-SN and OJ decreased and SNB increased (P<0.05). Changes of SNA and IMPA were not significant(P>0.05). In vertical dimension OB decreased and L6-MP increased(P<0.05).Conclusion: Due to simultaneous three dimensional correction in transverse, sagittal and vertical dimensions, the patient benefits of the short period of treatment in the golden growth period. Also correction in skeletal and dentoalveolar relations and improvement in profile happens.
Maryam Poosit; Mohammad Basafa; Farzaneh Ahrari; Amin Reza Movahedian
Abstract
Aim: There is little information about the diagnostic ability of SNB and Facial angles in class II malocclusion. The aim of this study was to evaluate sensitivity and specificity of SNB and Facial angle in diagnosing anteroposterior position of mandible in patients with skeletal class II malocclusion.Material ...
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Aim: There is little information about the diagnostic ability of SNB and Facial angles in class II malocclusion. The aim of this study was to evaluate sensitivity and specificity of SNB and Facial angle in diagnosing anteroposterior position of mandible in patients with skeletal class II malocclusion.Material and Methods: Pretreatment cephalograms of 76 patients with skeletal class II malocclusion were assessed in this study. Sensitivity and specificity of SNB and Facial angles were determined using SPSS and ROC (Receiver Operative Characteristics) curves.Results: Sensitivity and specificity of Facial angle were 61 and 70 percent, respectively. The corresponding values for SNB angle were 40 and 86 percent. The highest sensitivity and specificity for SNB and Facial angles related to 75.5 and 79.5 degrees, respectively.Conclusion: The findings showed that in diagnosing mandibular anteroposterior position of class II patients, Facial angle is more sensitive and SNB angle is more specific. Moreover, it is suggested that in cephalometric analysis, patients with Facial and SNB angles less than 79.5 and 75.5 degree respectively, be assumed to have skeletal class II malocclusion.
