Marchiori Erica Cristina, Garcia Robson Rodrigues, Moreira Roger William Fernandes
Oral and Maxillofacial Surgery Division, Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas-UNICAMP, Av. Limeira 901, Piracicaba, SP, Brazil.
Oral Maxillofac Surg. 2013 Jun;17(2):109-14. doi: 10.1007/s10006-012-0353-6. Epub 2012 Aug 7.
The aim of this study was to evaluate whether a 6° counterclockwise change in occlusal plane inclination would produce significant modifications on the final result of a maxillary impaction and mandible advancement model surgery.
Four groups were used in this study, with ten identical maxillary casts and one mandibular cast mounted on the same semi-adjustable articulator, with the same malocclusion. The occlusal plane of the two control and study groups had an inclination of 13° and 7°, respectively. Preoperative and postoperative measures were performed using the Erickson platform and impactions of 6 and 10 mm were tested. To control these movements during model surgery, two splints were fabricated using another two maxillary and mandibular casts mounted with occlusal plane of 13°, simulating the proposed movement.
The results were compared using the t test. Only the antero-posterior movement of the upper incisor was statistically significant for both study groups (p < 0.05), with a mean of 0.48 and 0.94 mm in the 10 and 6 mm impaction groups, respectively.
This information means that if an error in the occlusal plane transference occur, it will not be clinically significant, because differences smaller than 1 mm does not have influence on soft and hard tissue final result.
