Abstract

Objective: To determine the morphological distribution of Classes II malocclusions according to skeletal pattern in an adult sample of the School of Dentistry of the University of Chile. Materials and methods: The experimental sample consisted of 220 individuals over 18 with an ANB angle greater than 4 degrees. SNA and SNB angles were measured to assign the Class II skeletal pattern. Results: The most frequent skeletal pattern was the mandibular pattern followed by the maxillary pattern. In addition, three new skeletal patterns were found. They have not been explicitly described before in the relevant literature (bi-protrusion, bi-retrusion and within normal range). Conclusions: The most frequent Class II malocclusion skeletal pattern in our study was the mandibular pattern. The bi-retruded and bi-protruded variants should be incorporated into the skeletal diagnosis, particularly the bi-retruded variant, due to its significant high frequency and clinical relevance.