Deuteromelayu Race Characteristic on Class III Malocclusion with Mandibular Prognathism

Skeletal class III with mandibular prognathism is a condition in which the mandible is advanced anteriorly involving the teeth and jawbone, resulting in occlusion deviation. This disorder varies by race. 97 samples were obtained from the Oral Surgery department of Hasan Sadikin Hospital, Padjadjaran University Dental Hospital, and dental clinics in Bandung, Jakarta, and Semarang, separated into two groups, namely the case group III Skeletal with Mandibular Prognathism and the control group based on inclusion and exclusion criteria. Then a cephalometric examination was carried out to obtain the values of SNA, SNB, ANB, ramus height, corpus length, gonion angle, BUI classification, OP-SN angle, and SN-MP angle. 47 samples with an average SNA score of 860 and an SNB score of 91.50 were included in the case group. The case group averaged a ramus length of 5.43 cm, a corpus length of 8.74 cm, and a gonion angle of 130.10. The MP-SN angle is 270>, the OP-SN angle is 140>, and the average includes clusters 4 and 5 of the BUI classification. The MP-SN angle is formed between the mandibular plane line and the cranial base, averaging 230-370. The development of the face in the vertical direction is related to the growth pattern of the maxilla and mandible. In the sample group of class III prognathic mandibles, it was found that the number of samples that had an SN-MP angle greater than 270 was 25 samples or 62.5%. The OPSN angle value between the lines SN (cranial base) and OP (occlusal plane) has a standard value of 140; if the value is greater than the standard value, it indicates that the individual has excessive vertical growth whereas if the value is smaller than the average value, the title suggests an individual with excessive horizontal growth.6 The sample group of corner cases is smaller than 140, totalling 33 samples or 82.5%. The BUI classification shows clusters 4 and 5 do not belong to the long face category. Skeletal class III samples with the Deutero-Malay race's mandibular prognathism show shorter than long faces.