[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)).

[Twins and the heritability of dentofacial phenotype].

In orthodontics and dentofacial orthopaedics, where genetic and environmental factors interpenetrate from the early stages of development, the clinician tries to determine how mechanics could influence patient's growth pattern. Comparing monozygotic and dizygotic twins, in their similarities and their differences, gives some answers..

[Known gene interactions as implicated in craniofacial development].

Many genes intervening in development, morphogenesis and craniofacial growth have been identified, primarily by the use of mice mutants. We can distinguish two families: the signalling factors and the transcription factors. The latter interact with DNA to activate or to inhibit the expression of other genes.

[Growth and morphogenesis of the craniofacial bones. Applications in orthodontics. The concepts of J. Delaire].

The present report about J. Delaire's lecture summarizes his approach to: the nature and physiology of the membranous sutures, the "neural" and "adaptive" growth of the cranial base, the "central" and "cortical" development of the maxillary, the role of the premaxillary "skeletal entity" in the development of the anterior part of the face, the "bifocal" development of the mandible, the architectural balance of the craniofacial set (leading to the author's cephalometric analysis).