engleski

Dental and Skeletal Relationships in Subjects with Class III Malocclusions

The objective of this study is to determine dental and skeletal relationships and growth patterns in a Croatian population with Class III malocclusions by cephalometric radiographic methods (focusing on differences between maxillary retrognathism and mandibular prognathism). The examined sample consisted of pretreatment lateral cephalometric records of 201 (111 females and 90 males) untreated Class III patients of Caucasian Croatian ancestry from the Department of Orthodontics at Zagreb University. The measurements were divided into seven categories for analysis: cranial base, maxillary, mandibular skeletal relationships variables, intermaxillary, dentoalveolar, vertical and soft tissue profile facial relationships. To determine the vertical growth pattern Bjork- Jarabak analysis and ratio between nasion-sella and menton-gonion ( N- S/Me-Go ) were used. Maxillary retrognathism was associated with shorter maxilla (Co-A), shorter length (Go-Gn), height (Ar-Go) and diagonal of the mandible (Co- Gn), larger mandible angle (Me-Go-Ar) and a more pronounced vertical growth pattern. A significant feature of mandibular prognathism is more pronounced proclination of the maxillary incisors. The results of the present study show that maxillary retrognathism is more often associated with a vertical growth pattern, which is not favorable for therapy with a protraction face mask.

class III ; mandibular prognathism ; maxillary retrognathism ; growth pattern

nije evidentirano