Dental Spacing in Primary Dentition of Nigerian Children and its Relationship to Arch and Crown Dimensions

Objectives: The aims of this study were to compare mesiodistal and buccolingual crown widths; as well as dental arch dimensions between children with spaced and normal dental arches; and to determine which of the parameters mostly influence dental spacing. Methods: Crown and dental arch dimensions of dental casts of 125 children; grouped into spaced and normal primary dental arches; based on the tooth size-arch length discrepancy; were measured using electronic digital caliper. The data were statistically analyzed using t-test and stepwise multiple regression analysis. Results: Maxillary and mandibular spaced arches had statistically significant larger intercanine widths than the normal arches. The total mesiodistal tooth size in both arches; and mean buccolingual width of the mandibular first and second primary molars of the spaced arches were significantly smaller than those of the normal arches. However; there were no significant differences between spaced and normal arches in arch length; arch depth and intermolar arch width. The most important predictor of spacing in both arches is the intercanine width; followed by total mesiodistal tooth size. Conclusions: The parameter that mostly influences dental spacing is the intercanine width

Etudes des variations volumetriques de la dent en relation avec la fluorose endemique (a propos de 80 observations)

Etude qui porte sur le role du fluor dans les variations volumetriques des couronnes dentaires dans le cas d'indigestion chronique de doses toxiques de fluor; c'est-a-dire dans les cas de fluorose dentaire. L'echantillon est compose de 80 sujets repartis en deux groupes de 40 sujets chacun. Il y a un groupe cible et un groupe temoin. On a effectue des mesures au pied a coulisse sur les empreintes de tous les sujets; et; pour chaque type de dent; note les diametres mesio-distal (MD) et vestibulo-lingual (VL). Les resultats montrent que les dents atteintes de fluorose ont des volumes coronaires plus importants que ceux des dents indemnes de fluorose. On a conclu que la fluorose dentaire est sujette a une augmentation volumetrique de couronnes des dents atteintes; alors que l'ingestion de fluor; a des doses optimales (1 ppm/l); diminue les volumes dentaires