Background Many cases of ClassⅡdeformities have been reported to be treated with prefabricated appliances.The aim of this study was to distinguish the clinical effect of traditional custom-made appliances and prefabr...Background Many cases of ClassⅡdeformities have been reported to be treated with prefabricated appliances.The aim of this study was to distinguish the clinical effect of traditional custom-made appliances and prefabricated appliances in the treatment of ClassⅡdivision 1 malocclusion.Therefore,soft and hard tissue changes following treatment of ClassⅡdivision 1 malocclusion using the twin-block(TB)appliance was compared to that using the Myofunctional Research Company(MRC)appliance(K1+K2)combined with oral myofunctional treatment(OMT)(MRC+OMT).Methods The study included 22 children(6 boys and 16 girls aged 9–11 years)with ClassⅡdivision 1 malocclusion along with mandibular retrognathism with a 5–12 mm overjet,basic normal maxillary status,and stage 2 or 3 cervical vertebral maturation(CVM).Participants were randomly assigned into two groups,the TB group and the MRC+OMT group for 12 months.Standardized lateral cephalograms were used to assess skeletal,dental,and soft tissue changes from pre-to post-treatment.Independent t-tests were used to compare the initial and final cephalometric status and tissue changes between the groups.Results The TB and MRC+OMT groups resulted in different degrees of lateral changes;however,improvements of skeletal and soft tissue indices were significantly greater in the TB group than in the MRC+OMT group.Conclusion TB was more effective than MRC+OMT in treating children aged 9–11 years with ClassⅡdivision 1 malocclusion.However,further research using custom-made appliances with OMT is recommended,and further investigations are needed to confirm these findings.展开更多
Aim To determine cephalometrically the mechanism of the treatment effects of non-extraction and multiloop edgewise archwire （MEAW） technique on postpeak Class Ⅱ Division 1 patients. Methodology In this retrospectiv...Aim To determine cephalometrically the mechanism of the treatment effects of non-extraction and multiloop edgewise archwire （MEAW） technique on postpeak Class Ⅱ Division 1 patients. Methodology In this retrospective study, 16 postpeak Class Ⅱ Division 1 patients successfully corrected using a non-extraction and MEAW technique were cephalometrically evaluated and compared with 16 matched control subjects treated using an extraction technique. Using CorelDRAW software, standardized digital cephalograms preand post-active treatments were traced and a reference grid was set up. The superimpositions were based on the cranial base, the mandibular and the maxilla regions,and skeletal and dental changes were measured. Changes following treatment were evaluated using the paired-sample t-test. Student＇s t-test for unpaired samples was used to assess the differences in changes between the MEAW and the extraction control groups. Results The correction of the molar relationships comprised 54% skeletal change （mainly the advancement of the mandible） and 46% dental change. Correction of the anterior teeth relationships comprised 30% skeletal change and 70% dental change. Conclusion The MEAW technique can produce the desired vertical and sagittal movement of the tooth segment and then effectively stimulate mandibular advancement by utilizing the residual growth potential of the condyle.展开更多
文摘Background Many cases of ClassⅡdeformities have been reported to be treated with prefabricated appliances.The aim of this study was to distinguish the clinical effect of traditional custom-made appliances and prefabricated appliances in the treatment of ClassⅡdivision 1 malocclusion.Therefore,soft and hard tissue changes following treatment of ClassⅡdivision 1 malocclusion using the twin-block(TB)appliance was compared to that using the Myofunctional Research Company(MRC)appliance(K1+K2)combined with oral myofunctional treatment(OMT)(MRC+OMT).Methods The study included 22 children(6 boys and 16 girls aged 9–11 years)with ClassⅡdivision 1 malocclusion along with mandibular retrognathism with a 5–12 mm overjet,basic normal maxillary status,and stage 2 or 3 cervical vertebral maturation(CVM).Participants were randomly assigned into two groups,the TB group and the MRC+OMT group for 12 months.Standardized lateral cephalograms were used to assess skeletal,dental,and soft tissue changes from pre-to post-treatment.Independent t-tests were used to compare the initial and final cephalometric status and tissue changes between the groups.Results The TB and MRC+OMT groups resulted in different degrees of lateral changes;however,improvements of skeletal and soft tissue indices were significantly greater in the TB group than in the MRC+OMT group.Conclusion TB was more effective than MRC+OMT in treating children aged 9–11 years with ClassⅡdivision 1 malocclusion.However,further research using custom-made appliances with OMT is recommended,and further investigations are needed to confirm these findings.
文摘Aim To determine cephalometrically the mechanism of the treatment effects of non-extraction and multiloop edgewise archwire （MEAW） technique on postpeak Class Ⅱ Division 1 patients. Methodology In this retrospective study, 16 postpeak Class Ⅱ Division 1 patients successfully corrected using a non-extraction and MEAW technique were cephalometrically evaluated and compared with 16 matched control subjects treated using an extraction technique. Using CorelDRAW software, standardized digital cephalograms preand post-active treatments were traced and a reference grid was set up. The superimpositions were based on the cranial base, the mandibular and the maxilla regions,and skeletal and dental changes were measured. Changes following treatment were evaluated using the paired-sample t-test. Student＇s t-test for unpaired samples was used to assess the differences in changes between the MEAW and the extraction control groups. Results The correction of the molar relationships comprised 54% skeletal change （mainly the advancement of the mandible） and 46% dental change. Correction of the anterior teeth relationships comprised 30% skeletal change and 70% dental change. Conclusion The MEAW technique can produce the desired vertical and sagittal movement of the tooth segment and then effectively stimulate mandibular advancement by utilizing the residual growth potential of the condyle.
