PubMed · 6576480
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S Suga. 1983. [Alveolar bone--its structure, function and reaction].. https://pubmed.ncbi.nlm.nih.gov/6576480/
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Several growth factors (or cytokines) have been recently investigated for their use as potential therapeutics for periodontal tissue regeneration. The objective of this study was to evaluate periodontal tissue regeneration, including new bone and cementum formation, following topical application of recombinant basic fibroblast growth factor (bFGF, FGF-2) to furcation class II defects. Twelve furcation class II bone defects were surgically created in six beagle dogs, then recombinant bFGF (30 micro g/site) + gelatinous carrier was topically applied to the bony defects. Six weeks after application, periodontal regeneration was analyzed. In all sites where bFGF was applied, periodontal ligament formation with new cementum deposits and new bone formation was observed histomorphometrically, in amounts greater than in the control sites. Basic FGF-applied sites exhibited significant regeneration as represented by the new bone formation rate (NBR) (83.6 +/- 14.3%), new trabecular bone formation rate (NTBR) (44.1 +/- 9.5%), and new cementum formation rate (NCR) (97.0 +/- 7.5%). In contrast, in the carrier-only sites, the NBR, NTBR, and NCR were 35.4 +/- 8.9%, 16.6 +/- 6.2%, and 37.2 +/- 15.1%, respectively. Moreover, no instances of epithelial down growth, ankylosis, or root resorption were observed in the bFGF-applied sites examined. The present results indicate that topical application of bFGF can enhance considerable periodontal regeneration in artificially created furcation class II bone defects of beagle dogs.
The mammalian tooth forms by a series of reciprocal epithelial-mesenchymal interactions. Although several signaling pathways and transcription factors have been implicated in regulating molar crown development, relatively little is known about the regulation of root development. Four genes encoding nuclear factor I (NFI) transcription-replication proteins are present in the mouse genome: Nfia, Nfib, Nfic, and NFIX: In order to elucidate its physiological role(s), we disrupted the Nfic gene in mice. Heterozygous animals appear normal, whereas Nfic(-/-) mice have unique tooth pathologies: molars lacking roots, thin and brittle mandibular incisors, and weakened abnormal maxillary incisors. Feeding in Nfic(-/-) mice is impaired, resulting in severe runting and premature death of mice reared on standard laboratory chow. However, a soft-dough diet mitigates the feeding impairment and maintains viability. Although Nfic is expressed in many organ systems, including the developing tooth, the tooth root development defects were the prominent phenotype. Indeed, molar crown development is normal, and well-nourished Nfic(-/-) animals are fertile and can live as long as their wild-type littermates. The Nfic mutation is the first mutation described that affects primarily tooth root formation and should greatly aid our understanding of postnatal tooth development.
BACKGROUND: Verruciform xanthoma (VX), a rare, benign lesion of the skin and mucosa, is slow-growing, asymptomatic and characterized by a granular (verruciform) surface. It is yellowish-red or grey in color and up to 2 cm in diameter. Histologically, a papillary and/or verrucous proliferation of the squamous epithelium with hyperparakeratosis and numerous foam cells is present. These cells are predominantly located within the papillae of the lamina propria. For differential diagnosis, other papillomatous and verrucous lesions such as verrucous carcinomas or squamous cell carcinomas need to be ruled out. CASE REPORT: A 46-year-old patient with VX located on the alveolar process regio 26-28 is presented. Clinically, a 2 x 2 cm granular, oral mucosa surface lesion extending onto the palate occurred in regio 26-28. Biopsy was characterized light microscopically by the presence of swollen, elongated cells in the submucosa, an indication of VX alterations. Transmission electron microscopy demonstrated foam cells in the subepithelium containing numerous membrane-bound vesicles similar in diameter and showing a wide variation in electron density. Morphologically, these cells resembled macrophage-related cells. The lesion was excised in total with no evidence of recurrence after 9 months. DISCUSSION: The pathogenesis of VX is still unclear. The characteristic xanthoma cells may play a major role in VX. Microscopic analysis of the morphology of the foam cells indicated that they may represent a differentiated form of macrophages. Lipid vesicles inside these cells differed in their electron density indicating a heterogeneous biochemistry or different states of maturation.