Articles scientifiques

2016 / English – International Journal of Paediatric Dentistry 2016; 26: 426–438

Agnès Bloch-Zupan

“Background. Hypophosphatasia (HPP) is a rareinherited metabolic disease in which mutations in the ALPL gene (encoding tissue-nonspecific alkaline phosphatase) result in varying degrees of enzyme deficiency. HPP manifests in a spectrum of symptoms, including early primary tooth loss (root intact) and alveolar bone mineralisation defects.
Objective. To provide an overview of HPP for dental professionals to help recognise and differentially diagnose patients for appropriate referral to a specialist team.
Methods. A non-systematic review of publications on HPP was performed.”

2016 / Français – ROS – Septembre 2016 – Tome 45 – N° 3

F. Clauss, F. Obry, S. Jung, JC. Dahlet, E. Waltmann, A. Bloch-Zupan, V. Vogt, MC. Manière

“Les thérapeutiques implantaires précoces des patients atteints de dysplasie ectodermique présentent des spécificités chirurgicales, anatomiques et physiologiques en rapport avec le phénotype osseux et la croissance. Le degré de maturité squelettique et psychique, le phénotype dentaire et les antécédents prothétiques sont des éléments diagnostiques essentiels. L’imagerie sectionnelle CBCT pré-opératoire est essentielle dans ce contexte et permet une évaluation qualitative et mensurative du support osseux symphysaire. En fonction des observations cliniques et tomographiques, le praticien s’orientera vers la mise en place d’implants standards de faible dimension ou de mini-implants, dans les cas d’anodontie ou d’hypotrophie osseuse très marquée. La différence de taille entre ces deux approches est la nécessité de dépose des miniimplants à la fin de la croissance et leur remplacement par des implants ostéointégrés standards. Des études multi-centriques, un recul clinique et radiologique plus important sont nécessaires pour mieux étudier le comportement de ces mini-implants à long terme. Un suivi rigoureux de l’ostéointégration et un renouvellement prothétique régulier de la prothèse adjointe supra-implantaire, en fonction du rythme de croissance des bases osseuses, sont nécessaires.”

2016 / Français – Réalités cliniques 2016, Vol. 27, n°3: pp.176-185

 F. Clauss, S. Jung, F. Bornert, A. Bloch-Zupan, M.C. Manière

“Le rôle de dépistage du chirurgien-dentiste est central dans les différents types d’anomalies du développement dentaire isolées ou syndromiques, comme les agénésies dentaires multiples, les anomalies de structure ou de morphologie. De nombreux syndromes polymalformatifs associent un phénotype dentaire à diverses atteintes systémiques, parmi lesquels on retrouve les dysplasies ectodermiques, les polyposes adénomateuses familiales, le syndrome ERS (Enamel-Renal syndrome), par exemple. Des signes cliniques dento-maxillaires sont retrouvés en association avec des formes de cancer cutané ou de tumeurs des systèmes nerveux ou endocrinien, citons par exemple la néoplasie endocrine multiple 2B ou le syndrome de Gorlin. Ces anomalies dentaires constituent autant de signes d’appel pour le praticien, permettant de suspecter des pathologies potentiellement sévères.”

2016 / English – Journal of Dental Research – Research Reports: Clinical

M.K. Prasad, S. Laouina, M. El Alloussi, H. Dollfus and A. Bloch-Zupan

Abstract
“Amelogenesis imperfecta (AI) is a clinically and genetically heterogeneous group of diseases characterized by enamel defects. The authors have identified a large consanguineous Moroccan family segregating different clinical subtypes of hypoplastic and hypomineralized AI in different individuals within the family. Using targeted next-generation sequencing, the authors identified a novel heterozygous nonsense mutation in COL17A1 (c.1873C>T, p.R625*) segregating with hypoplastic AI and a novel homozygous 8-bp deletion in C4orf26 (c.39_46del, p.Cys14Glyfs*18) segregating with hypomineralized-hypoplastic AI in this family. This study highlights the phenotypic and genotypic heterogeneity of AI that can exist even within a single consanguineous family. Furthermore, the identification of novel mutations in COL17A1 and C4orf26 and their correlation with distinct AI phenotypes can contribute to a better understanding of the pathophysiology of AI and the contribution of these genes to amelogenesis.”

2016 / English – Oral Diseases 2017; 23: 424-439

Jung S, Martin T, Schmittbuhl M, Huck O.

“Systemic sclerosis (SSc) is a rare multisystem connective tissue disorder characterized by the triad fibrosis, vasculopathy and immune dysregulation. This chronic disease has a significant impact on the orofacial region that is involved in more than two-thirds of the cases. SSc patients can show a wide array of oral manifestations, which are usually associated with a severe impairment of the quality of life. They often present a decreased the salivary flow and a reduced mouth opening that contribute substantially to the worsening of the oral health status. Therefore, SSc patients require specific and multidisciplinary interventions that should be initiated as early as possible. The identification of specific radiological and clinical signs at the early stage will improve the management of such patients. This study reviews the wide spectrum of orofacial manifestations associated with SSc and suggests clues for the oral management that remains challenging.”

March 2016 / English – Journal Frontiers in Physiology – Craniofacial Biology and Dental Research

Agnès Bloch-Zupan^*, Mathilde Huckert, Corinne Stoetzel, Julia Meyer, Véronique Geoffroy, Rabisoa W. Razafindrakoto, Saholy N. Ralison, Jean-Claude Randrianaivo, Georgette Ralison, Rija O. Andriamasinoro, Rija H. Ramanampamaharana, Solofomanantsoa E. Randrianazary, Louise H. Ralimanana, Béatrice Richard, Philippe Gorry, Marie-Cécile Manière, Jeanne A. Rasoamananjara, Simone Rakoto Alson and Hélène Dollfus

“A large family from a small village in Madagascar, Antanetilava, is known to present with colored teeth. Through previous collaboration and 4 successive visits in 1994, 2004, 2005, and 2012, we provided dental care to the inhabitants and diagnosed dentinogenesis imperfecta. Recently, using whole exome sequencing we confirmed the clinical diagnosis by identifying a novel single nucleotide deletion in exon 5 of DSPP. This paper underlines the necessity of long run research, the importance of international and interpersonal collaborations as well as the major contribution of next generation sequencing tools in the genetic diagnosis of rare oro-dental anomalies. This study is registered in ClinicalTrials (https://clinicaltrials.gov) under the number NCT02397824.”

Read the article: http://journal.frontiersin.org/article/10.3389/fphys.2016.00070/full