title: Mechanical evaluation of six techniques for stable fixation of the sagittal split osteotomy after counterclockwise mandibular advancement.
abstract: We have evaluated the resistance to displacement of six stable methods of fixation of a sagittal split ramus osteotomy (SSRO) in the mandibular advancement with counterclockwise rotation. We tested 60 synthetic hemimandibles in six groups of 10 each: Group I - fixation with a straight four-hole 2.0mm miniplate; Group II - a straight six-hole 2.0mm miniplate; Group III - two straight 2.0mm four-hole miniplates; Group IV - an eight-hole 2.0mm (grid plate); Group V - a 2.0mm four-hole straight miniplate and 2.0×12mm bicortical screw; and Group VI - a straight four-hole 2.0mm locking miniplate. We applied a linear force in the region between the canine and the first premolar using a universal testing machine (EMIC- DL2000) with a loading cell of 10 KN. The loads at 1, 3, and 5mm displacement were recorded (N) and the data transmitted from the load cell to a computer. Results were analysed using analysis of variance (ANOVA) (p<0.001) and the Tukey post-test for comparison of the significance of the differences between the groups. For the three degrees of displacement, fixation with two straight 2.0mm plates and with the grid plate gave higher load values.
authors.affiliation: Dental School at Araraquara, Oral and Maxillofacial Surgery Division, São Paulo State University - UNESP, Araraquara, São Paulo, Brazil.
authors.forename: Leandro Benetti
authors.initials: LB
authors.lastname: De Oliveira
authors.affiliation: Dental School at Araraquara, Department of Prosthodontics, São Paulo State University - UNESP, Araraquara, São Paulo, Brazil.
authors.forename: Jose Mauricio Nunes
authors.initials: JM
authors.lastname: Reis
authors.affiliation: Section of Oral Radiology, Department of Dentistry, Faculty of Health, Aarhus University, Denmark.
authors.forename: Rubens
authors.initials: R
authors.lastname: Spin-Neto
authors.affiliation: Dental School at Araraquara, Oral and Maxillofacial Surgery Division, São Paulo State University - UNESP, Araraquara, São Paulo, Brazil.
authors.forename: Marisa Aparecida Cabrini
authors.initials: MA
authors.lastname: Gabrielli
authors.affiliation: Maktoum Bin Hamdan Dental University College, Dubai, United Arab Emirates. Electronic address: yeneroguz@gmail.com.
authors.forename: Yener
authors.initials: Y
authors.lastname: Oguz
authors.affiliation: Dental School at Araraquara, Oral and Maxillofacial Surgery Division, São Paulo State University - UNESP, Araraquara, São Paulo, Brazil.
authors.forename: Valfrido Antonio
authors.initials: VA
authors.lastname: Pereira-Filho
mesh_terms: D001696:Biomechanical Phenomena; D001860:Bone Plates; D006801:Humans; D008334:Mandible; D019186:Mandibular Advancement; D008953:Models, Anatomic; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods*
keywords: Bone plate; Rigid internal fixation; Sagittal split ramus osteotomy