Influence of wrong determination of occlusal plane in maxillary advancement: a model surgery study

Author(s)

Maximiana Cristina de Souza Maliska

• Document type: Master's Dissertation
• Press: Piracicaba, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
• Defense date: 2012-03-29

Examining board members

Roger William Fernandes Moreira; Rubens Guimarães Filho; Leandro Eduardo Klüppel

• Advisor: Roger William Fernandes Moreira

Abstract

This study investigated whether an occlusal plane error of acquisition can influence in the treatment planning and result of maxillary advancement in double-jaw surgeries. Advancement of 8 and 4 millimeters were studied in different groups. For each group 20 maxillary models were mounted by a 13 degrees platform with superior articulator arm (control group) and another 20 models mounted with minus 6 degrees (study group). Intermediate splint was obtained by cast surgery performed in the control group. All the 40 maxillary models were remounted with this intermediate splint. Measurements in vertical and anteroposterior planes were accomplished pre and post-operatively by digital caliper rule and Erickson's platform. Statistical analysis showed significant results in all planes. The alteration of occlusal plane from 13 degrees to 7 degrees modified the final result in vertical measurements: right molar from group of 4 mm advancement (p<0.0001) and left molar from two groups of advancement (p<0.0001); in anteroposterior measurements: maxillary incisor from 4 mm of advancement (p<0.005) and 8 mm of advancement (p<0.0001). Notwithstanding the importance of statistical findings, this study was limited by a range of 4 mm of advancement and a range of 6 degrees of angle alteration because the sample were chosen by the laboratorial methodology. Clinical studies evolving these questions must be supplied in scientific literature (AU)

• FAPESP's process: 10/04639-8 - Influence of face-bow transference in the acquisition of occlusal plane for maxillary advancement surgical planning in bimaxillary orthognathic surgery
• Grantee: Maximiana Cristina de Souza Maliska
• Support Opportunities: Scholarships in Brazil - Master