I Gusti Aju Wahju Ardani, Ageng Wicaksono, Thalca Hamid Orthodontics Department, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, East Java, IndonesiaCorrespondence: I Gusti Aju Wahju ArdaniDepartment of Orthodontics, Faculty of Dental Medicine, Universitas Airlangga, Jl. Prof. Dr. Moestopo 47, Surabaya, IndonesiaTel/Fax +62 31 5030255Email wahju_ardani@fkg.unair.ac.idIntroduction: The occlusal plane is very important in the stomatognathic and aesthetic dentofacial system.

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... on of the occlusal plane plays an important role in class III malocclusion correction. For this reason, the strategy in establishing the diagnosis, prognosis and treatment plan becomes more complex, so a more comprehensive analysis of the occlusal plane inclination as a parameter of diagnosis is needed for more effective and efficient treatments.Aim: The aim of this study was to determine the comparison of occlusal plane inclination between class III and class I malocclusions and to knowing the correlation of occlusal plane inclination in class III malocclusions with the direction of facial growth.Materials and Methods: Samples were secondary lateral cephalograms collected at the Universitas Airlangga (UNAIR) Dental Hospital in October 2017– 2018. Cephalograms were traced using the OrthovisionTM software; then, the Mann–Whitney comparative statistical test (p< 0.05) was carried out followed by the canonical correlation test.Results: Differences in class III and class I malocclusions were found in the OP-AB and OP-FH angles. The OP-AB angle is the occlusal plane inclination which has the strongest correlation compared to others. OP-AB angle is strongly correlated with horizontal growth parameter, especially theSNB. The OP-AB angle is also correlated with vertical growth parameters: the Y axis and the Facial axis.Conclusion: The OP-AB angle is a parameter that can distinguish between class III and class I malocclusions. The OP-AB angle has a strong correlation with vertical and horizontal growth directions.Keywords: cephalom [...]