Gonçalves LA, Boldrini SC, Capote TSO, Binotti CB, Azeredo RA, Martini DT, Rosenberg B, Bautz WG, Liberti EA. Structural and ultra-structural features of the first mandibular molars of young rats submitted to pre and postnatal protein deficiencies.
Open Dent J 2009;
3:125-31. [PMID:
19557153 PMCID:
PMC2701319 DOI:
10.2174/1874210600903010125]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Revised: 02/26/2009] [Accepted: 04/08/2009] [Indexed: 11/28/2022] Open
Abstract
The effects of protein malnutrition, both in utero and prior to weaning, on formation of the first mandibular molars were evaluated by phase-contrast and electron microscopy in rats. The nourished group (GI) received a diet that included 20% casein, while the malnourished group (GII) received 5% casein. The first mandibular molars from GII exhibited low density of cells and odontoblasts, which lacked regular organization compared with molars from GI. In addition, a difference in collagen type was observed between the groups, with a prevalence of Type III collagen fibers detected in the dentin, periodontal ligament, and alveolar bone of GII, and a prevalence of Type I collagen fibers in GI. Finally, examination of surface area in molar sagittal sections indicated 30% less dentin in GII, compared with GI. Our results suggest that structural and ultra-structural features of the dentin-pulp complex and periodontal components of rat molars are affected by protein deficiency.
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