OBJECTIVE: This study aimed to explore the usefulness of adjunctive buccal and palatal corticotomy for adult maxillary expansion in an animal model using cone-beam computed tomography (CBCT). METHODS: Twelve adult sheep were randomly divided into two groups (each n = 6): a control group, where no treatment was administered, and a treatment group, where buccal and palatal corticotomy-assisted maxillary expansion was performed. CBCT scans were taken before (T1) and after (T2) treatment. Differences in all transverse dental and alveolar dimensions, alveolar width at crest level, hard palate level, horizontal bone loss, interdental cusp width and inter-root apex were assessed using Wilcoxon signed-rank and Mann-Whitney U-tests. Kruskal-Wallis tests and pairwise comparisons were used to detect the significance of differences among the inter-premolar and inter-molar widths. RESULTS: CBCT data revealed significant changes in all transverse dental and alveolar dimensions. The mean interpremolar alveolar width showed an increase of 2.29 to 3.62 mm at the hard palate level, 3.89 to 4.38 mm at the alveolar crest level, and 9.17 to 10.42 mm at the buccal cusp level. Dental changes in the vertical dimension were not significant. CONCLUSIONS: Our findings based on an adult animal model suggest that adjunctive buccal and palatal corticotomy can allow for both skeletal and dental expansion, with the amount of dental expansion exceeding that of skeletal expansion at alveolar crest and hard palate levels by two and three folds, respectively. Therefore, this treatment modality is potential to enhance the outcomes of maxillary expansion in adults.
Adult* ; Animals* ; Cone-Beam Computed Tomography ; Humans ; Models, Animal* ; Palatal Expansion Technique* ; Palate, Hard ; Sheep ; Vertical Dimension

OBJECTIVE: This study examined bone microstructure restoration after rapid maxillary expansion (RME) with and without corticotomy over multiple retention periods. METHODS: Eighteen male Dorper sheep were randomly distributed into three groups (n = 6 each group): group 1, RME with corticotomy on the buccal and palatal sides; group 2, conventional RME treatment; and group 3, no treatment. Post-RME, trabecular bone microstructure and new bone formation were evaluated by using microcomputed tomography (microCT) and histomorphometry after a 4- or 12-week retention period. Intergroup differences in bone quality and bone remodeling were analyzed by using two-way analysis of variance with Bonferroni post-hoc test. RESULTS: The bone volume fraction (bone volume [BV]/total volume [TV]) values relative to the control in groups 1 and 2 were 54.40% to 69.88% after the 4-week retention period and returned to approximately 80% after the 12-week retention period. The pooled BV/TV values of the banded teeth in groups 1 and 2 were significantly lower than those of the control after the 4-week retention period (p < 0.05). However, after the 12-week retention period, the pooled BV/TV values in group 2 were significantly lower than those in groups 1 and 3 (p < 0.05). Histomorphological analysis showed that the new bone formation area in group 1 was approximately two to three times of those in group 2 and control. CONCLUSIONS Corticotomy significantly enhanced the restoration of bone quality after the retention periods for banded teeth. This benefit might result from the increased new bone formation after corticotomy.

Introduction: Obesity is a global issue called as “globesity”. Overweight and obesity may lead to many noncommunicable diseases (NCDs). Primary care is the first centre to monitor and follow-up the progress of NCD patients. Therefore, the objective of this study was to determine the effectiveness of an integrated-Weight Management Programme (i-WMP) to reduce body weight among NCD patients from two Government primary care clinics from Hulu Langat District. Methods: This study was single-blinded randomised controlled trial by design. There were 244 eligible patients were randomised into intervention (n = 122) or wait-list control group (n = 122). The i-WMP was developed based on the behaviour change wheel through the operationalization of behaviour change techniques. The duration of this intervention programme was four weeks. Data collected at week 0, week 4, and week 12. The software IBM SPSS was used to analyse the data. Generalized linear mixed model analysis with intention-to-treat principle was applied. Results: The retention rate was 74.2%. Findings showed that the i-WMP was significantly effective in reducing not only body weight as primary outcome but also secondary outcomes such as waist-to-height ratio, waist circumference, body mass index, and total sitting time. It also improved effectively other secondary outcomes such as participants’ knowledge, attitude, and practice towards dietary and towards physical activity. However, no significant changes were reported for body fat percentage and total physical activity metabolic equivalent of task-minutes/week. Conclusion: Implications surrounding the implementation of i-WMP in the primary care clinics are recommended.