Validity of a manual soft tissue profile prediction method following mandibular setback osteotomy

Olga-Elpis Kolokitha, Olga-Elpis Kolokitha

Abstract

Objectives: The aim of this study was to determine the validity of a manual cephalometric method used for predicting the post-operative soft tissue profiles of patients who underwent mandibular setback surgery and compare it to a computerized cephalometric prediction method (Dentofacial Planner). Lateral cephalograms of 18 adults with mandibular prognathism taken at the end of pre-surgical orthodontics and approximately one year after surgery were used.

Methods: To test the validity of the manual method the prediction tracings were compared to the actual post-operative tracings. The Dentofacial Planner software was used to develop the computerized post-surgical prediction tracings. Both manual and computerized prediction printouts were analyzed by using the cephalometric system PORDIOS. Statistical analysis was performed by means of t-test.

Results: Comparison between manual prediction tracings and the actual post-operative profile showed that the manual method results in more convex soft tissue profiles; the upper lip was found in a more prominent position, upper lip thickness was increased and, the mandible and lower lip were found in a less posterior position than that of the actual profiles. Comparison between computerized and manual prediction methods showed that in the manual method upper lip thickness was increased, the upper lip was found in a more anterior position and the lower anterior facial height was increased as compared to the computerized prediction method.

Conclusions: Cephalometric simulation of post-operative soft tissue profile following orthodontic-surgical management of mandibular prognathism imposes certain limitations related to the methods implied. However, both manual and computerized prediction methods remain a useful tool for patient communication.

Keywords: Cephalometry; Mandibular setback; Orthognathic surgery; Prediction; Soft tissue profile.

Figures

Figure 1
Figure 1
Coordinate system construction.
Figure 2
Figure 2
Dentoskeletal and soft tissue cephalometric landmarks used in the comparison of the prediction and post-treatment computer profile printouts. G=glabella; S=sella; N=nasion; N’=soft tissue nasion; P=porion; O=orbital; Ba=basion; Pn=pronasale; Pns=posterior nasal spine; Ans=anterior nasal spine; Isa=incision superior apical; Sn=subnasale; A=point A; A’=soft tissue point A; U1=maxillary incisor; Ls=labrale superius; Iii=incision inferior incisal; Sts=stomion superius; Sti=stomion inferius; St=stomion; L1= mandibular incisor; Isi=incision superior incisal; Li=labrale inferius; Tgo=tangent gonion; B=point B; B’=soft tissue point B; Iia=incision inferior apical; Pg=pogonion; Pg’=soft tissue pogonion; Me=menton; Me’=soft tissue menton

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Source: PubMed

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