Dental and Oral Biology

Concrescence of teeth is a actually a form of fusion that occurs after formation of the root. In this condition, teeth are united by cementum only.

Torus mandibularis is an exostosis or outgrowth of bone found on the lingual surface of mandible. It is seen above the mylohyoid line and opposite the bicuspid teeth. It is usually bilateral, and surgical removal of torus is advised sometimes due to the difficulty encountered in construction of a denture.

Dens in dente is also called dens invaginatus or dilated composite odontome . This condition arises due to invagination of inner enamel epithelium in the surface of tooth, before the calcification has occurred. This term was coined due to the appearance of a tooth within a tooth.

Fibroelastic changes occurring in the propria lead to blanching of oral mucosa.

Leukoedema, clinically, can be seen as a white filmy opalaescent hue to definite grayish white area. It disappears on stretching and this is a characteristic feature of leukoedema. No treatment is required. It is a normal variation of oral mucosa.

Xerostomia is not a disease by itself, but the result of certain other disease. Only the quantity of saliva secreted is decreased in xerotomia, but the quality remains unchanged.

S.sanguis is the next most common organism implicated in dental caries after S.mutans.

The destruction of the alveolar bone may displace the teeth producing 'floating tooth' appearance.

Products of the necrosed pulp enter the periapical tissue. Thereby stimulating the proliferation of cell rests of malassez. The central cells of this proliferation mass of cells undergo degeneration to form a cystic cavity.

Question asked here is about benign tumour, and all epuli need not be tumours. So, the answer is fibroma and not epulis.

Tetracycline causes yellowish or brownish - grey diffuse bands of discoloration that are located within the tooth structure and are not on the surface.

Several organisms have been found capable of including carious lesions; these include mutans group of streptococcus.

Each tooth is embedded in a socket of jaw bone. This type of attachment is called thecodont.

Humans are heterodont and diphyodont.

Molar teeth are known as wisdom teeth.