This in vivo comparative study will evaluate the changes in the mandibular dimensions and the glenoid fossa after skeletal class III subjects' therapy by chincup appliance and compare it with an untreated class III control group. Pre and post-treatment low-dose computed tomography images will be taken before and after achieving positive overjet and undergoing 16 months of active treatment/ observation. Dimensional and volumetric changes in the mandible, condyles, and glenoid fossa will be calculated and compared to those observed in the control group.
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Change in the mandibular volume and superficial area
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Changes in the condylar volume and superficial area
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Change in the mandibular body (Go-Gn)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Change in the ramus height (Co-Go)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Change in the total body length (Co-Gn)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Change in the mandibular angle (GN-Go-CO)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Change in the vertical position of the condyle (CP-FH)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Change in the sagittal position of the condyle (CP-Y)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
change in the vertical position of the mandibular fossa (FP-FH)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Change in the sagittal position of the mandibular fossa (FP-Y)
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment
Quantitative changes of displacement of superimposed 3D mode
Timeframe: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment