Histological study of the tempro-mandibular joint after partial loss of teeth, experimental study

Twelve dogs were included in the persent work. They were divided into six groups according to the extracted teeth. Microscopical study of the TMJ was done to detect the histopathological changes following loss of teeth. The following conclusions may be drawn: The degree of TMJ disturbance was directly related to the severity of the intermaxillary disturbance. Considerable disturbances occur as a result of disharmony in the relation of the remaining teeth and TMJ. Change in force or direction of stress, especially after loss of posterior teeth causes structural changes. These are characterized by degeneration and destruction of the articular surface of the condyle and disc. Pressure of the mandibular condyle may lead to compression of the different structures with consequent impaired function. Fibrous ankylosis of the condyle could occur following destruction of the condylar cartilage and its replacement by fibrous tissue. The presence of teeth is essential to the normal functional occlusion that is in harmony with the neuromuscular system and TMJ. Therefore preservation of function is best served by conservation and protection of the natural dentition whenever possible. It is recommended to restore the extracted teeth as early as possible to avoid any damage to the TMJ

Local analgesic solutions supplemented with alkaline solution and periodontal ligament injections in extraction of hypersensitive teeth

Clinical investigations were carried out to assess the possible value of alkaline solution and periodontal ligament injection supplementing the procaine Hcl local analgesic solution in extraction of hypersensitive teeth in 60 patients. Failures were obtained when the alkaline solution was used and were overcome by using the periodontal ligament injection