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At least 739 records · Page 41Linked to original sources
PubMed1995

Developmental arrest of tooth bud after correction of mandibular fracture.

A case of multiple fractures of the mandible following a car accident in a five-year-old patient is reported. The fracture line passed distal to the first molar tooth bud. The fracture was treated by wire osteosynthesis and skeletal fixation. During the ensuing 18 months, a gradual arrest of the development of the first molar tooth bud was radiologically observed. The eruption process had not been disturbed, and the tooth erupted at the age of 6 1/2 years. Since the distal root had completely failed to develop and the mesial roots showed a diminished size, the tooth was extracted. Histopathological examination revealed disturbed dentin apposition, there was almost complete obliteration of the pulp chamber by globular dentin, and evidence of root resorption.

Child, Preschool↗
PubMed1975

Histological study on the postnatal development and sequence of eruption of the maxillary cheek-teeth of rabbits (Oryctolagus cuniculus).

The development and sequence of eruption of the maxillary cheek-teeth of rabbits were studied by histological methods. The presence of three deciduous molars which were replaced by correspondent premolars and of three permanent molars without predecessors was confirmed. The eruption of the maxillary deciduous molars was shown to begin at 4 days postnatally and that of the permanent molar at 9 days, while the eruption of the premolars occurs from 24 days on, replacing the deciduous molars which are exfoliated. The last tooth to erupt is the M3. At 32 days all the permanent cheek-teeth are erupted. The deciduous molars are completely developed at birth, root resorption starting at 4 days. On the first day the premolars are in the bell stage and in the M1 and M2 amelogenesis is taking place. After 27 days the development of the permanent maxillary cheek-teeth is completed. Dentinogenesis, amelogenesis and cementogenesis were observed in all of them.

Age Factors↗
PubMed1987

Experimentally induced resorption cavities in rat molars.

The incidence and ultrastructure of resorption cavities were studied in albino rat molars. The transseptal fiber system between the 1st and 2nd maxillary molars in 30 albino rats aged 50 days was transected by buccopalatal incision. Fifty approximal surfaces represented the experimental material. Unaffected interproximal areas and approximal surfaces of adjacent teeth as well as of 10 teeth from five healthy, unoperated rats served as controls. The rats scheduled for operation were assigned to experimental groups each comprising three or four animals. Following injury, the incisional wounds were allowed to heal for 1, 2, 4, 5, 6, 8, 10, 14 and 21 days. The animals were sacrificed by an overdose of pentothal sodium and specimens prepared for light and electron microscopy. Normal, healthy teeth showed no resorption cavities on tooth surfaces facing the interproximal area, in contrast to the observation that minor resorption cavities with cemental repair were regularly present on root surfaces facing periodontal ligament. Following surgical injury, extensive resorption cavities in dentin and cementum developed on experimental surfaces adjacent to the area of wound healing. Arrest of active resorption in some of the experimentally induced cavities had occurred in 14-day specimens. Repair of resorption cavities appeared to start by attachment of connective tissue fibers to exposed dentinal and cemental collagen. The ultrastructural observations indicate that initial fibril attachment to exposed collagen is mediated by a granular, coating material resembling minute deposits of afibrillar cementum.

Animals↗
PubMed1993

Autotransplantation of a tooth using guided tissue regeneration.

Autotransplantation is an alternative treatment to replace missing or periodontally-involved hopeless teeth. A prerequisite for performing this procedure is having a recipient site with sufficient bone volume to support the transplant. Often, however, crestal bone resorption following tooth extraction or periodontitis results in a reduced alveolar ridge with inadequate dimensions to properly house the transplant. In these cases, the procedure is contraindicated. A case is presented in which the biologic principle of guided tissue regeneration was used to gain periodontal support around an autotransplanted 3rd molar. The results suggest the potential use of guided tissue regeneration in conjunction with autotransplantation. This may represent a new area in reconstructive dentistry.

Alveolar Bone Loss↗