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ABSTRACT:
AIM: The aim of this study is to compare various dentinal structures such as dentinal tubules, interglobular dentin, incremental lines of dentin and the dead tracts in primary and permanent molars under compound light microscopy.
BACKGROUND: Dentin, the first formed hard tissue is tough and resilient in nature, which is important for the proper functioning of the tooth. It provides flexibility and prevents fracture of the overlying enamel. The dentin in permanent teeth is thicker than that of primary teeth. Some of the structures observed in the dentinal surface include dentinal tubules, interglobular dentin, incremental lines, tomes granular layer and dead tracts.
MATERIALS AND METHODS: 4 unrestored, non carious primary and 5 permanent molars were collected. Longitudinal ground sections of the teeth were obtained and observed under compound microscopy.
REASON: In order to understand the dentin structure better to ensure better outcomes in dental procedures.
KEYWORDS: dentin, light microscopy, dentinal tubules, primary molars, permanent molars.
Received on 17.05.2015 Modified on 14.06.2015
Accepted on 20.06.2015 © RJPT All right reserved
Research J. Pharm. and Tech. 8(10): Oct., 2015; Page 1369-1373
DOI: 10.5958/0974-360X.2015.00245.0
INTRODUCTION:
Dentin is the first formed dental hard tissue which provides the bulk and general form of the tooth. Since it is formed before the enamel, it is responsible for determining the shape of the crown, the number and size of the roots [1]. This living tissue is laid down by specialized cells called odontoblasts which have their cytoplasmic processes inside closely packed dentinal tubules which traverse the entire thickness of dentin [2].
Dentin has a bone-like matrix but is found to be harder than bone and softer than enamel. This difference can be readily distinguished on radiographs were dentin appears more radiolucent than enamel and more radiopaque than dentin. The hardness varies slightly between tooth types and between coronal and radicular dentin in such a way that it is slightly harder in the central part than the periphery. Dentin is usually light yellowish in color in teeth of younger individuals and darkens with age.
It is brittle, viscoelastic, provides flexibility and prevents fracture of the overlying enamel [1].
Mature dentin is composed of approximately 70% inorganic material, 20% organic matter and 10% of water. Substituted hydroxyapatite crystals arranged in the...