Objectives: Compensatory is a mechanism that preserve a proportional and harmonious facial pattern in patients with Class III skeletal pattern. There are two major treatments for this type of patient which are orthodontic surgery and fixed orthodontic appliances. The objective of this study is to assess dentoalveolar and soft tissue compensation in Class III skeletal pattern in relation to normal occlusion. Methods: Pre-operative lateral cephalometric radiograph of 30 patients each from Class I and Class III skeletal pattern were selected for this study. The cephalometric parametric such as sagittal jaw relationship, occlusal plane angulation, chin thickness, distance of lips toward aesthetic line, incisors inclination were measured. Results: The result shows significant difference in DL' (p = 0.019), ANB (p = 0.000), SN-AB (p = 0.004), SN-L1 (p = 0.001), SNB (p = 0.037), L1A (p = 0.000) and DU' (p = 0.001). There are no significant differences in other sagittal jaw relationship,upper incisor proclination, distance of upper lip to aesthetic line and thickness of chin. Conclusion: In summary, the dentoalveolar compensation in Class III skeletal pattern is by retroclination of the lower incisors meanwhile the soft tissue compensation is achieved by the change of the distance of the upper and lower lips towards the aesthetic line, in response to the inclination of the incisors.

Introduction: The purpose of this in vitro study was to evaluate the effect of thermocycling on the compressive strength of selected luting cements. Material and methods: 5 types of luting cements were tested. A total of thirty cylindrical specimens measuring 6mm in height and 4mm in diameter were prepared for each type of cement which were then divided into two groups ie Group 1: Exposure, and Group 2: Control. Both groups were stored in distilled water at 37�C for 24 hours. Group 1 was subjected to 500 cycles in a thermocycling baths of 5�C and 55�C with 20 seconds in each bath. Group 2 was not exposed to thermocycling procedure. The compressive strength for each cement type was determined by using a universal testing machine. Results: Resin adhesive cement had the highest compressive strength; followed by conventional glass ionomer cement (GIC) whilst resin modified GIC was the least. Thermocycling had no significant effect on the compressive strength of RelyX� ARC and Fuji I (p > 0.05), but a significant effect on Fuji I CAPSULE, Fuji CEM, Fuji Plus CAPSLUE (p < 0.05) was observed. Conclusion: The effect of thermocycling on the compressive strength of luting cements differed considerably with respect to their chemical compositions. � 2018 Default.