Transmission electron microscopic appearance of dentin matrix in type II dentin dysplasia

Abstract

Waltimo J, Ranta H, Lukinmaa P-L: Transmission electron microscopic appearance of dentin matrix in type II denlin dysplasia. ScandJ DenL Res 1991; 99: 349-56.Abstract -Dentin matrix of demineralized primary and permanent teeth with type II dentin dysplasia was studied by transmission electron microscopy. The coronal dentin of a maxillary third molar exhibited a normal structure. In the radicular dentin, tubules v\'ere few in number; the major part of the dentin was composed of thick, curvy bundles of cross-striated collagen fibers. In the most aberrant areas ofthe radicular dentin, coarse collagen fibers measuring up to 140 nm in thickness were obsen'ed. The dentin ofthe primary tooth showed a similar, but somewhat less irregular, structure.

Hyperfibers and vesicles in dentin matrix in dentinogenesis imperfecta (Dl) associated with osteogenesis imperfecta (01)

“…Matrix vesicles are not a constituent of normal human mature circumpulpal dentin (13,15), but neither have they been reported previously in heritable dentin disorders stich as dentin dysplasia (15) or dentinogenesis imperfecta. The formation and ultrastructure of dentin affected by these aberrations is r'^'f f!…”

Dentine disorders and adhesive treatments: A systematic review

“…The first-formed (i.e., mantle and primary) dentine is tubular, and appears to have undergone normal mineralisation. Circumpulpal dentine is atubular and hypomineralised, and shows an unorganised collagen matrix [3,13,35,[39][40][41][42][43][44][45][46].…”

“…Different methods such as confocal laser-scanning microscopy, light microscopy, optical microscopy, optical coherence tomography, polarised light microscopy, selected-area diffraction, scanning electron microscopy and transmission electron microscopy were used. Two articles studied teeth affected by DD-I [31,42] and two others by DD-II [32,43]. As many studies focused on isolated DI (n=14/32) as on OI/DI (n=15/32).…”

Genetic and structural alterations of enamel and dentin- amelogenesis imperfecta, dentinogenesis imperfecta and dentin dysplasia

“…Dentin defects are classified into three types of DI (DGI, types I-III) and two types DD (DDs, types I and II). 20,21 In DGI, the dentin is defective and soft. In DD, the pulp chambers may be obliterated by abnormal dentin.…”