Correction of mandibular retrognathia and laterognathia by distraction osteogenesis mm and the overjet decreased by a mean of 12.2 mm after treatment. Ramus height increased by 3 mm in one patient only. Increase in gonial an- gle was observed in post-treatment records in all 3 patients except one who later exhibited re- lapse in follow-up records. Moreover, a signifi- cant increase in convexity angle was observed on the completion of treatment in all 3 patients. Of all these 3 patients, patient 3 exhibited the most significant relapse in ANB angle, gonial angle, horizontal overjet and convexity angle in follow up records. In patients 4 and 5, a mean of 3.5° decrease was observed in ANB angle and the mandibular corpus length increased by a mean of 5.5 mm after treat- ment. One of these patients showed an increase of 10 mm in ramus height on the affected side and a decrease of 5° in gonial angle whereas the other one showed an increase of 12.5° in gonial angle and an increase of 11 mm in ramus height on the affected side after treatment. In both patients the horizontal overjet was reduced with treatment and the convexity angle became more obtuse. A mean of 7 mm correction was achieved in relation to craniofacial midline. Follow up records indicated 1 mm of relapse in horizontal overjet in patient 4 and 0.2 mm of relapse in horizontal overjet and 1° of relapse in convexity angle in patient 5. The re- sults of lateral cephalometric analysis are shown in Table 2. Pre- and post-treatment photographs and radiographs along with pre-treatment study casts of patient 2 are shown in Figures 2 and 3. Pre-and post- treatment photographs and radio- graphs of patient 5 are shown in Figures 4 and 5. dIscussIon Bilateral sagittal split osteotomy (BSSO) and distraction osteogenesis are the most common Figure 2. (a-c) Pre-treatment study casts, (d-f) pre-treatment extra-oral photographs, (g) pre-distraction lateral cephalo- metric radiograph and (h) pre-distraction panoramic radio- graph of Patient 2. Figure 3. Post-treatment (a-c) intra-oral photographs, (d-f) extra-oral photographs, (g) lateral cephalometric radiograph and (h) panoramic radiograph of Patient 2. 338 Figure 4. Pre-treatment (a-c) intra-oral photographs, (d-f) ex- tra-oral photographs, (g) lateral cephalometric radiograph, (h) PA cephalometric radiograph and (i) pre-distraction PA cepha- lometric radiograph of Patient 5. European Journal of Dentistry Figure 5. Post-treatment (a-c) intra-oral photographs, (d-f) extra-oral photographs, (g) lateral cephalometric radiograph and (h) PA cephalometric radiograph of Patient 5.