title: Biomechanical evaluation of different fixation systems after Le Fort I osteotomy in polyurethane models of unilateral clefts.
abstract: We compared the stability of three different titanium plate-and-screw fixation systems after Le Fort I osteotomy in polyurethane models of unilateral clefts. Thirty-six models were divided into 3 groups. In the first group, we adapted standard Plates 1mm thick with 2.0mm screws and placed them bilaterally on the zygomatic buttress and the piriform rim. In the second group, we did the same and added Plates 0.6mm thick with 1.6mm screws between the standard 2mm miniplates on both sides. In the last group, we placed Plates 1.4mm thick with 2.0mm screws bilaterally on the maxillary zygomatic buttress and piriform rim. Each group was tested in the inferosuperior (IS) and anteroposterior (AP) directions with a servo-hydraulic testing unit. In the IS direction, displacement values were not significantly different up to 80N, but between 80 and 210N, those in the 2×1.4mm group were better. In the AP direction, displacement values were not significantly different up to 40N, but between 40 and 180N, they were better in the standard with 1.6×0.6mm group and the 2×1.4mm group. When normal biting forces (90 - 260N) in the postoperative period are considered, the greatest resistance to occlusal loads was seen in the 2×1.4mm group. In the others, the biomechanical properties were better in the AP direction.
authors.affiliation: Necmettin Erbakan Universtiy, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Konya/Turkey. Electronic address: dtaesen@hotmail.com.
authors.forename: Alparslan
authors.initials: A
authors.lastname: Esen
authors.affiliation: Necmettin Erbakan Universtiy, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Konya/Turkey.
authors.forename: Kubilay
authors.initials: K
authors.lastname: Isik
authors.affiliation: Selcuk Universtiy, Faculty of Technology, Department of Mechanical Engineering, Konya/Turkey.
authors.forename: Haci
authors.initials: H
authors.lastname: Saglam
authors.affiliation: Selcuk Universtiy, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Konya/Turkey.
authors.forename: Yusuf Bugra
authors.initials: YB
authors.lastname: Ozdemir
authors.affiliation: Selcuk Universtiy, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Konya/Turkey.
authors.forename: Dogan
authors.initials: D
authors.lastname: Dolanmaz
mesh_terms: D001732:Bite Force; D001860:Bone Plates; D002972:Cleft Palate / Q000601:surgery; D006801:Humans; D008437:Maxilla; D010027:Osteotomy; D019340:Osteotomy, Le Fort; D011140:Polyurethanes
chemical_list: D011140:Polyurethanes
keywords: Cleft palate; Le fort osteotomy; Orthognathic surgery; Skeletal stability