title: [Alveolar bone thickness in A point area : how to avoid periodontal failures in front of upper incisors].
abstract: Studies on orthodontic-periodontics relationships are numerous but few have benefited from the contribution of new 3D imaging techniques that emphasize iatrogenic effects that orthodontics may have on the periodontium. Periodontal risk in terms of fenestration, bone dehiscences next maxillary incisors are real during or after orthodontic treatment. The accurate assessment of the initial situation in terms of bone quantity in this dental arch anterior segment is thus very important. Our study aimed to evaluate the reliability of conventional lateral cephalograms to quantify alveolar bone thickness in relation to the maxillary incisors by comparing it with data from CT scans. The second objective was to identify an at risk patient profile by assessing possible correlations between this thickness and dysmorphia components. The results revealed a half of assessment error in the estimation of bone thickness and increased risk in case of hyperdivergence typology, Class III skeletal relationships and dento-alveolar protrusion. Finally, in view of these data, we discussed the clinical procedures to avoid such periodontal failures in this anterior segment of the dental arch.
authors.affiliation: Villa Gabrielle, 314 boulevard Marcel Pagnol, 13400 Aubagne, France.
authors.forename: Émilie
authors.initials: É
authors.lastname: Chevalier
authors.affiliation: Unité Fonctionnelle d'Orthopédie Dento-Faciale, Hôpital de la Timone Marseille, 264 Rue Saint-Pierre, 13385 Marseille Cedex 5, France.
authors.forename: Camille
authors.initials: C
authors.lastname: Philip-Alliez
authors.affiliation: Villa Gabrielle, 314 boulevard Marcel Pagnol, 13400 Aubagne, France - Unité Fonctionnelle d'Orthopédie Dento-Faciale, Hôpital de la Timone Marseille, 264 Rue Saint-Pierre, 13385 Marseille Cedex 5, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Le Gall
mesh_terms: D000293:Adolescent; D000328:Adult; D016301:Alveolar Bone Loss / Q000517:prevention & control*; D000539:Alveolar Process / Q000000981:diagnostic imaging*; D001696:Biomechanical Phenomena; D002508:Cephalometry / Q000706:statistics & numerical data*; D002648:Child; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000706:statistics & numerical data; D021621:Imaging, Three-Dimensional / Q000706:statistics & numerical data; D007180:Incisor / Q000000981:diagnostic imaging*; D008297:Male; D008311:Malocclusion, Angle Class I / Q000000981:diagnostic imaging; D008312:Malocclusion, Angle Class II / Q000000981:diagnostic imaging; D008313:Malocclusion, Angle Class III / Q000000981:diagnostic imaging; D008437:Maxilla / Q000000981:diagnostic imaging*; D008875:Middle Aged; D009910:Oral Hygiene; D010512:Periodontal Index; D013314:Stress, Mechanical; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data*; D014087:Tooth Movement Techniques / Q000295:instrumentation; D055815:Young Adult