Technical Note
Orthognathic Surgery
Virtual model surgery and wafer fabrication for orthognathic surgery

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Abstract

Model surgery is one of the most important steps in the preoperative workup for orthognathic surgery. In cases of complicated two-jaw surgery, manual model surgery requires many laboratory based steps that are time-consuming and may contain potential errors. Recently, a three-dimensional virtual model surgery (3D-VMS) program (3Txer version 2, Orapix, Seoul, Korea) was introduced. The purpose of this article is to present a 3D-VMS case using combined data from 3D computed tomography and 3D virtual dental casts.

Section snippets

Case report

An 18-year-old male complained of a prognathic mandible. Clinical evaluation, lateral cephalometric analysis and model analysis revealed a concave profile with mandibular protrusion and normodivergent pattern, reverse overjet (–4.0 mm), Class III molar relationship, upper and lower arch length discrepancies (–2 mm and –5 mm, respectively) and lower dental midline deviation to the right side (Fig. 1). The patient had a history of fixed orthodontic treatment with non-extraction for 5 years.

The

Discussion

Recently, the concept of 3D-VMS was introduced.1, 8 Song and Baek8 compared the accuracy of model surgery between 3D-VMS and MMS. The errors with 3D-VMS (0.00–0.35 mm) were less than with MMS (0.00–0.94 mm), so they concluded that 3D-VMS was more accurate and clinically acceptable than MMS.8

In the present case, only 3D-CT data and preoperative dental casts with CR bite were needed for 3D-VMS. With the 3D-VMS program (3Txer version 2.0, Orapix), many laboratory based steps including face-bow

Competing interests

None declared.

Funding

None.

Ethical approval

Not required.

References (10)

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