[Contribution of 3D imaging using 3DNEO(®) software in surgical-orthodontic treatment of impacted teeth].

Objectives: The aim of this investigation was to present and evaluate an original method of mini-invasive oral surgery and orthodontics based on 3D images from a computed tomography software (3DNEO(®), 3DNEOVISION).

Materials And Methods: Three patients with impacted teeth were examined and their data were analyzed with this software based on the "region growing" method.

Results: Several clinical interests emerge : locate and visualize precisely the relationships of the impacted tooth with the adjacent anatomical elements under the desired angle, associate/dissociate the different elements of the 3D scene, measure the distances, calculate the axes of traction, materialize the way of traction and the optimal point for bonding, prepare virtually the surgical exposure and orthodontic treatment plan.

[One phase or two-phase orthodontic treatment: comparisons].

Introduction: The optimal timing for starting an orthodontic treatment is discussed by many authors. This is even more difficult that there are different therapeutic approaches. In case of Class II, division 1 malocclusion, one approach consists of realising an early treatment during mixed dentition, then a surveillance phase and finally an alignment phase during adolescent dentition.

[Accelerated tooth movement by alveolar corticotomy or piezocision].

The relatively recent introduction of corticotomies and piezocision has made it possible for orthodontists to accelerate tooth movement and thereby to shorten the length of orthodontic treatment. Specialists emphasizing a mechanistic concept have been debating the underlying basic biological mechanics of these new therapeutic tools with opposing specialists who support a biological conception. Our analysis of different publications on the subject suggests that the biological explanation, with its emphasis on the Regional Acceleratory Phenomenon (RAP), is correct.

[Dento-facial orthopedics and osteopathy].

Osteopathy has grown rapidly. Given their common action on children and adolescents, the collaboration between dentofacial orthopedics and osteopathy is increasingly common. It therefore becomes necessary and urgent to investigate whether, based on data acquired from science, there is evidence of possible interrelations between the two disciplines.

[Early treatment of Class III: a long-term cohort study].

The aim of this comparative retrospective short- and long-term study was to evaluate the interceptive treatment in Class III malocclusion in daily orthodontic practice. The sample was composed of 69 children divided into two groups according to the interceptive treatment applied: 31 children in group F (facial mask) and 38 in group M (interceptive fixed appliance). A Pancherz cephalometric analysis was carried out on the lateral head films at the start of the study (t(0), after the active treatment (t(1) and 29 months after t(1) (t(2).

[Aesthetic repercussions of the class II treatment on the profile: comparative study Distal Activ Concept (DAC)/Extra-Oral Force (EOF)].

In the past orthodontists frequently used extra-oral force to slow down skeletal growth in their treatment of Class II malocclusions; more modern practice relies less on applying distal force to the maxilla than on stimulating forward growth of the mandible. Does this change in therapeutic design have any repercussions in facial esthetics? To evaluate the impact of treatment on the appearance of the profile, we conducted a study with 64 patients in the adolescent dentition stage with a Class II, division 1 malocclusions. None had teeth extracted or preliminary orthodontic treatment.

[Can orthodontic treatment generate temporomandibular disorders and pain? A review].

While considered for years to play the primary role in the etiology of temporo-mandibular joint disturbances (TMD), occlusal discrepancies are now considered to be just one causative factor among many. Recent studies, literature reviews or meta-analyses, and longitudinal studies with follow-up of children treated for many years all conclude that there is no risk of orthodontic treatment giving rise to episodes of temporo-mandibular disorders. The signs of TMD appearing during the course of orthodontic treatment should be considered in the context of the epidemiology of the disorder, which is characterized by a strong increase in its occurrence during adolescence.

[Is retention justified after interceptive treatment of Class II malocclusion?].

Indication of intermediate retention after early treatment of class II malocclusion has not been yet assessed by comparative studies. Therefore, it is up to the practitioner to analyse the need for retention in the time period between the two phases. Does wearing a retainer indeed decrease the chance of relapse between phase one and phase two? We performed a retrospective comparative study consisting of 90 subjects in mixed dentition with class II molar relationships with an increased overjet (> or = 5 mm) treated in the J.

[Are extraoral forces justified in the early treatment of Class II malocclusions?].

First phase class II early treatments are able to restore a correct growth. DAC (Distal Active Concept) is an early fixed treatment using class II elastics, coils and springs. The aim of this retrospective study was to evaluate short and long term dental and skeletal effects of head-gear applied on upper first molars associated to class II elastics and to compare our results to a sample treated with early DAC.

[Is hyperdivergence a contraindication in the early treatment of Class II malocclusion?].

Vertical growth pattern is supposed to have adverse effects on sagittal growth and is considered as a contra-indication for early treatment. The aim of this retrospective cohort study was to analyse whether early treatment of children with Class II malocclusion was able to achieve as an important sagittal correction on subjects with growth vertical pattern as on subjects without vertical pattern without modification of vertical growth. The study was composed of 123 children (110 months old in average), with Class II division 1 malocclusion : 34 children with excessive vertical growth pattern and 74 children without excessive vertical growth pattern, both treated with DAC appliance, and 15 not treated subjects with excessive vertical growth pattern.

[Not Available].

Facing a dental crowding, the orthodontist has several therapeutic options. If maxillary expansion is often used, mandibular orthodontic expansion is proscribed because of its tendency of inefficiency and relapse. Mandibular symphyseal distraction osteogenesis allows to remove this proscription.

[Not Available].

Unlabelled: Various factors participate to lower third molar eruption included premolar extractions. In Class II division 1 malocclusion, premolar extractions are sometimes decided to correct antero-posterior malocclusion. Alternative therapies without extractions exist such as DAC appliance.

[Interceptive treatment with the DAC appliance: structural analysis].

The aim of this retrospective short and middle term study was to evaluate dental and skeletal effects during early class II treatment. Thirty subjects were treated with DAC appliance, 32 children were not treated. Data were collected at the start of the study (t(1)), after the active treatment (t(1')) and 28 months after t(1) (t(2)).

Cleidocranial dysplasia: molecular genetic analysis and phenotypic-based description of a Middle European patient group.

Cleidocranial dysplasia (CCD) (OMIM 119600) is a rare dysplasia of osseous and dental tissue. Characteristic features are typical facial and dental appearance plus morphologic anomalies. RUNX2 (OMIM 600211), the responsible gene for CCD, is considered to be a master gene for bone development and bone homeostasis.