AIM: This double-blind clinical trial on consecutively treated patients compared the effects of two protocols for one-phase comprehensive treatment of Class II division 1 malocclusions (bonded Herbst followed by fixed appliances (BH+FA) versus headgear followed by fixed appliances and Class II elastics (HG+FA) at puberty and identified preferential candidates for the protocol incorporating the functional appliance (BH+FA) SUBJECTS AND METHODS: Both BH+FA and HG+FA samples comprised 28 patients. All patients started treatment at puberty (CS3 or CS4), and completed treatment at an advanced post-pubertal stage (CS5 or CS6). Lateral cephalograms were taken before therapy (T1) and at an average interval of 6 months after the completion of therapy (T2). In both groups the male-to-female ratio was 1:1 with a mean age at T1 of 13 years, and a mean T1-T2 interval of 33 months. The treated groups were compared with a matched control group of 28 subjects with untreated Class II malocclusions. ANOVA with Tukey’s post-hoc test was used for statistical comparisons. Discriminant analysis was applied to identify preferential candidates for the BH+FA protocol. RESULTS: The BH+FA group showed a significantly greater increase in mandibular protrusion associated with a significantly greater forward movement of the soft tissue chin when compared both with the HG+FA and control group. Discriminant analysis identified two pre-treatment variables (Co-Go-Me angle and Pogonion to Nasion perpendicular) that were significant (F = 4.48; P < 0.01) in predicting the post-treatment amount of mandibular soft tissue improvement. CONCLUSIONS: The protocol incorporating functional jaw orthopaedics at puberty had a greater favourable impact on the advancement of the chin. With the aim of achieving clinical excellence, ideal candidates for the BH+FA treatment protocol should be identified; they are represented by Class II patients with mandibular retrusion associated with a small Co-Go-Me angle before treatment.
|Titolo:||In search of clinical excellence: identification of ideal candidates for functional jaw orthopaedics|
|Anno di registrazione:||2009|
|Autori di Ateneo:|
|Autori:||L. Franchi; T. Baccetti|
|Appare nelle tipologie:||1c - Abstract su rivista|