[Dental complications during orthodontic preparation and orthognathic surgery].

Introduction: Orthodontic-surgical treatment can present risks to the dental organ and the periodontium. Despite the low incidence of such cases, these complications can compromise a treatment plan. Practitioners should be aware of these potential complications, take them into account during treatment in order to reduce their negative impact and, if necessary, manage them by orthodontic-surgical collaboration.

[Orthognathic surgery: the incisor decompensation and its effect on articulation].

Introduction: The surgical protocols are based on arches preparation before or immediately after the surgical phase. Incisor guides normalization is achieved by incisor decompensation in three dimensions. Place and extend of surgical movements depend on the incisor position obtained at the end of orthodontic preparation.

[Aesthetic success in genioplasties procedures criteria].

Maxillomandibular dysmorphia may be associated with structural chin pathologies. Three-dimensional jaws displacements have limits. Specific genioplasty is an additional surgical mean for soft tissues profile normalization.

[Innovations in diagnosis and treatment about a case of primary failure eruption linked to a PTHR1 gene mutation].

Primary failure of eruption is a rare condition marked by non-eruption of the posterior teeth due to mutation of a gene responsible for tooth eruption. Today, this anomaly can be detected early using innovative 3D-imaging techniques. Genetic and histologic testing will confirm the diagnosis and unfavorable prognosis.

[Skeletal discrepancies: could we avoid surgical procedures?].

Orthodontic-surgical protocols are nowadays considered as the state-of-the-art in cases of skeletal dentomaxillary dysmorphosis. However, for some reasons, it may happen that unquestionable indications for orthodontic-surgical procedures are not respected, patients being treated by orthodontics alone. This kind of mistake in the treatment planning lay the patient open to various potential complications such as: abnormal duration of the orthodontic treatment, dental root resorptions, questionable tooth extraction, unfavorable facial aesthetics, treatment instability.

[Does dental class II division 2 predispose to temporomandibular disorders?].

Because of its anatomical/physiological characteristics, the Class II division 2 (class II, div. 2) is one of the malocclusions considered as a possible risk factor for Temporomandibular disorders (TMD). A literature review was conducted from the electronic databases of Medline and Elsevier Masson, through the year 2010, in order to clarify the relationships that may exist between Class II division 2 and TMD.

[Cervical vertebrae: Mandibular growth dynamism indicators?].

A study of mandibular growth maturation was performed on a population of 103 patients during orthodontic treatment (69 girls and 34 boys) from 11 to 16 years, having initially a Class II skeletal discrepancy. The relationship between wrist maturation indices and the cervical vertebrae maturation was studied by Lamparski classification. Significant correlations were found between Björk stages, MP3=, MP3 cap and MP3 U and respectively Lamparski stages as CVS 2, CVS 3-4 and CVS 5-6.

[Is the ethnic factor an orthodontic therapeutic instructor?].

Because different groups in human society view beauty in stereotypical terms of their own ethnicity, orthodontists should study the concept of facial beauty with scientific rigor. Is it time for us to re-examine the assumption that the original cephalometric esthetic norms based on samples of North Americans can be applied to other populations? Many cephalometric analyses of Afro-American and Asian subjects who had not received orthodontic treatment but whose occlusions were normal have shown that their esthetic criteria were far different from those of the Caucasian North American sample. The Afro-Americans and Asians share a principal ethnic facial characteristic of bi-maxillary alveolo-dental protrusion with a reduced naso-labial angle.

[Orthognathic surgery is a team work!].

Orthodontic-surgical treatment of dentofacial anomalies involves a multidisciplinary approach that demands to be finely coordinated in order to get a good result. Historically, orthognathic surgery stemmed from the close collaboration between the orthodontist and the maxillo-facial surgeon; however thanks to the collaboration of many other specialists along the diagnostic and therapeutic process, orthognathic surgery nowadays reached an unprecedented level of quality, reliability, and safety. We discuss herein the role of the various specialists that may be involved in the treatment of a patient requiring an orthodontic-surgical coordinated approach, as we see it in the Department of MaxilloFacial Surgery of Centre Hospitalier Lyon-Sud.

[Cephalometric deciding factors in the early treatment of Class III malocclusion].

Many authors recommend early treatment for patients with Class III malocclusions in order to make their appearance more acceptable and also to re-channel the growth of basal bone into a normal pattern. However, the long-term effects and the stability of the results of this type of treatment have not been studied extensively. In the best interests of our patients, it would behoove us to know when early intervention is indicated and in what circumstances a strategy of watchful waiting and postponement of definitive treatment until the end of the growth period would be preferable.