Georges Bettega

Computer-assisted mandibular condyle positioning in orthognathic surgery

PURPOSEnThe correct placement of the mandibular condyle in the glenoid fossa during the osteosynthesis after the sagittal ramus osteotomy is often a problem. This article describes a computer-assisted positioning device.nnnMETHODSnThe procedure is based on the use of a three-dimensional optical localizer to establish the condylar segment position. The operative procedure is only slightly different from the usual.nnnRESULTSnThe system is very easy to use, it does not require preoperative data acquisition, and the accuracy obtained is in fractions of a millimeter.

A Biomechanical Model of the Human Tongue and Its Clinical Implications

Many surgical technics act on the upper airway in general, and on the tongue in particular. For example, tongue is one of the anatomical structures involved in the case of Pierre Robin syndrome, mandibular prognathism, or sleep apnoea syndrome.

Oncocytoma of the eyelid: An aggressive benign tumor

OBJECTIVEnThe authors report the case of an 83-year-old patient with a benign oncocytoma of the inferior eyelid.nnnDESIGNnINTERVENTIONal case report.nnnINTERVENTIONnTreatment consisted of a large orbital exenteration followed by reconstruction with a pedicled temporalis muscle flap.nnnMAIN OUTCOME MEASURESnHistologic evaluation and clinical follow-up were measured.nnnRESULTSnAfter a year of follow-up, there was no sign of local recurrence.nnnCONCLUSIONSnOncocytomas, even if benign, must be considered as very aggressive tumors and treated accordingly.

Computer Assisted Orthognathic Surgery

This paper presents a surgical simulator for orthognathic surgery based on the integration of dental models and 3D cephalometry. The objective of dental models integration is to make coherent informations gathered from different sources (occlusal analysis and CT scan), and for that purpose, a system using a 3D optical localizer is used. The 3D Cephalometry analysis is used for the detection of dysmorphosis and surgical planning. This cephalometry integrates the Inferrence process for improving the surgical system. Both elements of our simulator have been implemented and technically validated with success.

Computer-Assisted Orthognatic Surgery: Consequences of a Clinical Evaluation

Purpose and method: Computer-assisted systems, as any medical technology, have to go through several steps within an endless loop before becoming routine. The first step is the conception of a prototype, the second is its adaptation to the clinical modalities (via animals or cadavers studies), the third is the clinical validation and the last one is the ergonomics optimization preceding the industrialization.