Document Type : Research Paper


Department, College of dentistry, Mosul university


Aims: to detect the prevalence of PTID among our Class II sample and to establish a simple method to assess it, providing a diagnostic and therapeutic guidance for the Class II malocclusion treatment. Ma-terials and methodes: The existence of (PTID) was investigated among 114 Class II div.I adults. Ran-domly selected 30 subjects from each group, adding 30 Class I subjects (as a control group) for cast and Cephalometric measurements. Resultes: Mandibular retrusion with posteriorly displaced mandible of normal size, was of functional mandibular retrusion, while this retrusion when caused by micrognathic mandible, was of anatomic mandibular retrusion. Conclusions: The relevance of these findings was stressed for the treatment planning of Class II subjects, confirming that controlling the transverse com-ponent of the occlusal patterns represent an additional input signal for the anteroposterior adjustment between the skeletal bases