Dental and Oral Biology

 Increased tooth mobility is the characteristic sign of TFO ie: trauma from occlusion.

Refractory Periodontitis was coined in 1989 classification of periodontal diseases. It existed for a decade as a separate disease till 1999 when it was removed from the classification. A new term called recurrent periodontal disease was coined.

Periodontometer is a device invented by Muhlemann. It is a standardized method of measuring even minor tooth displacement. Periotest is a device to measure mobility of teeth as well as implants.

Enamel is secreted from ameloblasts, which are derived from oral epithelium tissue of ectodermal origin.

This type of teeth are found in vertebrates where each tooth is embedded in a socket of jaw bone that makes the attachment strongest.

This is correct answer. Vincent infection is contraindicated for extraction of teeth.

 Compound fracture: these fractures have a communication with the external environment, usually by the periodontal ligament of a tooth, and involve all fracture of the tooth-bearing portions of the jaws.

Cavernous sinus thrombosis is the severe complication of the canine space infection.

Post ramal approach: Hind approach.

Dentigerous cyst is clear pale straw coloured fluid.

 Bruxism (gnashing of teeth) is the correct term to explain the clenching of jaw and grinding of teeth.

Tooth enamel, composed mainly of hydroxyapatite, has a mineral content of 96% and ranks 5 on the Mohs scale, making it harder than bone (which contains more collagen and organic material), hair, and nails.

Canines are the sharp, pointed teeth located between incisors and premolars, designed for tearing and gripping food. Incisors are for cutting, premolars and molars are for grinding.

Concrescence is a form of fusion of cementum after completion of root formation.