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[Deciduous teeth].

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Dentistry↗
PubMed1988

Gingivitis in the human deciduous dentition. A correlative clinical and block surface light microscopic (BSLM) study.

This study examined the relationship between clinical and histomorphometric parameters in the human deciduous dentition. Clinical parameters including plaque index, gingival swelling, gingival color, tooth mobility and degree of root resorption were determined prior to the extraction of teeth. The teeth were extracted with their surrounding gingiva in order to preserve the in situ relationship between the hard and soft tissues. Histomorphometric analysis was carried out on 55 sites, using block surface light microscopy (BSLM). Apical migration of the junctional epithelium was found at 53% (29) of the sites. The gingival sulcus was shallow (0.3 +/- 0.19 mm) and coronal to the cemento-enamel junction at 84% (46) of the sites. Junctional epithelium with retepegs was present at 89% (49) of the sites, whilst an inflammatory cell infiltrate (ICI) was present at all sites examined. The ICI was located opposite to the junctional epithelium and cementum at 80% (44) of the sites. The extent of ICI correlated positively with the patients' age and was significantly increased when clinical evidence of gingival swelling or redness was present.

Adolescent↗
PubMed1998

Ultrastructural organization and microanalysis studies of deciduous enamel crystallites in regional odontodysplasia (RO).

The ultrastructural organization and chemical components of enamel crystallites in two deciduous teeth affected by RO, an uncommon developmental condition giving the tooth a ghost-like appearance, were investigated by scanning and transmission electron microscopy, X-ray diffraction, electron probe microanalysis and Fourier transform improved microspectroscopy. Pathologic mineralizations involving prismatic structures, which affected the size, shape and stoichiometric structure of crystallites and led to enhanced Mg/Ca and Na/Ca ratios and crystal defects, were observed. Local circulatory disorders may have caused this developmental anomaly.

Child, Preschool↗
PubMed1988

Cusp height relationships between the upper and lower molars in Japanese subjects.

Relationships of cusp height between the upper and lower first molars and between the deciduous second molars in Japanese subjects were analyzed with the aid of moiré contourography. In permanent molars, the height of the hypoconid had a mean value similar to that of the upper trigonal cusps, indicating that upper and lower functional cusps of the same height occlude with each other. In deciduous second molars, however, hypoconid heights were significantly smaller than trigonal cusp heights. Such differences in cusp height between permanent and deciduous dentition may be related to the function and phylogeny of tooth or jaw movements.

Child↗