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2017 » 4 » | Archive » Medical field » Fields » Dentistry »

Skeletal Changes after Surgical Corrections in Skeletal Class III Patients

 
Abstract:

This post is also available in: enEnglish slSlovenščina (Slovenian)

BACKGROUND. Skeletal class RIII (SRIII) is a dentofacial deformity, whose main characteristic is disharmony between upper and lower jaw with irregular position and/or size of upper and lower jaw in sagittal plane. The aim of our study was to objectively find out skeletal and soft tissue changes in facial profile on lateral cephalometric radiographs in patients with SRIII after different surgical procedures. METHODS. Orthognathic patients with SRIII who were operated at the Department of maxillofacial and oral surgery between 2007 and 2013 by the same surgeon were included in our study. The sample was composed of 110 patients. We divided the examined patients into three subgroups considering the surgical procedures (bilatereal sagittal split osteotomy, LeFort I osteotomy, bimaxillary operation). Radiographs were cephalometrically analysed in Dolphin program. RESULTS. SRIII patients had average angle ANB before surgery –3,3°, Wits appraisal –9,4mm. As expected, after surgery all parameters that determine the relationship between upper and lower jaw in sagittal plane characteristically approached the reference values. Length of base of lower jaw and gonial angle were characteristically smaller only in the subgroup with bimaxillary operation. Vertical parameters express the expected shortening of anterior lower face height in the subgroups with bilatereal sagittal split osteotomy and bimaxillary operation and an unexpected prolongation in the subgroup with LeFort I osteotomy. The distance between upper lip and aesthetic line shortens characteristically in all subgroups. Facial angle became bigger in all subgroups and facial profile approached the normal type in that way. CONCLUSIONS. Many results of our study were expected, but they have been objectively analysed in the Slovene population for the first time. The new knowledge represents a new information which have to be applied in orthognathic planning.

Authors:
Zala Skomina, Nataša Ihan Hren

Keywords:
skeletal class III, cephalometric analysis

Cite as:
Med Razgl. 2017; 56 (4): 429–47.
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