The Efficacy Of The Prefabricated T4FTM Myofunctional Appliance In Comparison To Twin Block Appliance For Class II Division 1 Malocclusion Treatment: A Randomized Clinical Trial

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dc.contributor.authorHanoun, Abdulfatah Abdulrazak
dc.date.accessioned2018-06-04T01:50:42Z
dc.date.available2018-06-04T01:50:42Z
dc.date.issued2010-04
dc.description.abstractFunctional appliances are widely used to treat Class II Division 1 malocclusion. No previous studies were published about the effects of prefabricated re-mouldable functional appliance (T4FTM) for Class II Division 1 malocclusion on Class II skeletal pattern subjects. The aim of this study was to compare the changes in the skeletal and dentoalveolar structures in growing Malay patients (pre-adolescent) with Class II Division 1 malocclusion treated by Prefabricated Re-mouldable Myofunctional appliance T4FTM and Twin Block appliance (TB). A randomized clinical trial was carried out with a sample of 43 subjects (22 males + 21 females) randomly assigned to active control group (Twin Block group) and experimental group (T4FTM appliance group). At the end of six months study period and due to the drop out, TB group consisted of 17 subjects (8 males + 9 females), while T4FTM group consisted of 16 subjects (9 males + 7 females). Mean age was 13 years (0.7) in T4FTM group, and 13.2 years (0.8) in Twin Block group. Pre- and post-treatment lateral cephalometric radiographs were taken for each subject and the overjet was clinically measured pre- and post- the six months treatment period. Twenty one angular and linear measurements were chosen and measured separately on the preand post-treatment lateral cephalometric radiographs. The changes during the study period were calculated by comparing pre- and post-treatment measurements in each group. The two groups were then compared in terms of the changes that occurred during the study period. Intra-class Correlation Coefficient test was used to test interand intra-examiner agreement of cephalometric measurements. (ICC) results ranged from 0.91 to 0.99 which were considered acceptable level of errors. Independent t test was used to compare the changes between the two groups. The between groups comparison in terms of the changes during treatment period showed significant difference in overjet, anterior posterior mandibular position and skeletal and dentoalveolar discrepancies which were changed more favourably in TB group. Overjet reduction was found to be two times more in TB group with a mean difference of 2.1mm (p <0.01). Sella-Nasion-B point angle was more increased in TB group with a mean difference of 1.25 ° (p <0.05). A point–Nasion-B point angle was decreased by 0.8° (0.9) and 1.6° (1.1) in T4FTM and TB groups respectively with a mean difference of 0.8 ° (p <0.05). The distance between Pogonion and the vertical reference line (Sv_Pog) was more favourably changed in TB group with a mean difference of 1.83mm (p <0.05). The distance between the lower incisal edge and the vertical reference line (Sv_ii) was also more favourably increased in TB group with a mean difference of 2.55mm (p <0.01). The distance between the upper and the lower incisal edges (is_ii) was decreased in TB group as two times as in T4FTM group with a mean difference of 1.8mm (p <0.05). The correction of the sagittal skeletal and dentoalveolar discrepancies was favourable for both groups. The amount of changes differed significantly between the two groups with more favourable correction in terms of the sagittal skeletal and dentoalveolar discrepancy was observed in TB group. The skeletal correction was due to the mandibular changes with no significant change in terms of sagittal position of maxilla in both groups. The dental contribution in both groups to the final overjet correction was a result of combination of upper incisor retroclination and lower incisor proclination. The mean lower incisor proclination that contributed to the overjet correction was higher than the mean upper incisor retroclination in Twin Block group; while in T4FTM group, the mean upper incisor inclination change was similar with the mean lower incisor inclination change. In conclusion, T4FTM appliance is an effective appliance for the management of BSI Class II Division 1 malocclusion on Class II skeletal pattern.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5650
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectFunctional appliances are widely useden_US
dc.subjectto treat Class II Division 1 malocclusionen_US
dc.titleThe Efficacy Of The Prefabricated T4FTM Myofunctional Appliance In Comparison To Twin Block Appliance For Class II Division 1 Malocclusion Treatment: A Randomized Clinical Trialen_US
dc.typeThesisen_US
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