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At least 1,729 records · Page 96Linked to original sources
PubMed1984

Root extrusion. Rationale and techniques.

The root extrusion techniques are easily mastered and are within the realm of every general practitioner. They can be applied in various situations in which restoration is very difficult or impossible. The dentist must first decide whether or not elevating the root up to 4 mm will help treatment. If the answer is yes, then many different methods can be used to accomplish this goal. Teeth that were formerly extracted can now be saved and restored routinely, leading to a functional and esthetically pleasing result.

Dental Caries↗
PubMed1997

Effect of experimental tooth movement on nerve fibres immunoreactive to calcitonin gene-related peptide, protein gene product 9.5, and blood vessel density and distribution in rats.

The effect of experimental tooth movement on nerve fibers immunoreactive to calcitonin gene-related peptide (CGRP) and to protein gene product (PGP) 9.5 were studied, as well as the coincidence of these responses with changes in blood vessel density and distribution in the periodontal ligament (PDL) and pulp of young Wistar rats. The first right maxillary molar was moved mesially by an orthodontic appliance for 3, 7, 14 and 21 days. Sagittal and horizontal serial sections were incubated alternately with antibodies to CGRP, PGP 9.5 and laminin. Nerve and blood vessel density and distribution between the experimental and control sides were compared in the apical and cervical PDL, and in root and coronal pulp. The most pronounced changes occurred in the 7 day group. CGRP and PGP 9.5 immunoreactive nerves in the apical PDL showed increased density, being distributed towards the alveolar bone and frequently found in bone resorption lacunae. Numerous nerve fibres were often present adjacent to hyalinized tissue, but were never found near or within root resorption lacunae. Nerve sprouting was also present both in the root and coronal pulp. Increased nerve and blood vessel density generally coincided with each other. At day 14, periodontal nerves and blood vessels were still disorganized compared with the controls. Tissues near cellular cementum and root resorption lacunae were consistently devoid of nerve fibres. After 21 days, PDL nerve and blood vessel density and distribution were nearly at control level. However, nerve fibres were regularly found inside root resorption areas. In conclusion, experimental tooth movement induces dynamic changes in density and distribution of periodontal and pulpal nerve fibres, indicating their involvement in both early stages of periodontal remodelling and later in the regenerative processes of the PDL, generally occurring in concerted action with modulation of blood vessels.

Alveolar Process↗
PubMed2004

Influence of orthodontic derotation and extrusion on pulpal and periodontal condition of autotransplanted immature third molars.

The aim of this study was to determine the influence of orthodontic treatment on the pulpal and periodontal condition of 91 transplanted immature third molars. In patients with atrophy of the alveolar process or unfavorable root morphology, transplants had to be placed in extreme rotated or infraoccluded positions. After 3 to 6 months, these transplants were derotated (45 degrees to 90 degrees) to a correct position in the dental arch (derotation group; n = 28) or extruded to the occlusal plane (extrusion group; n = 21). Finally, approximal spaces were closed in both groups. A sample of 42 transplanted third molars with no orthodontic treatment need served as the control group. All transplants were followed clinically and radiologically for a mean period of 4.0 years. With respect to pulpal and periodontal conditions, no significant differences were observed between the control and the extrusion group. In contrast, compared with the control group, transplants in the derotation group had a significantly poorer pulpal and periodontal condition. In the derotated transplants, a significant correlation was detected between pulp necrosis and orthodontic treatment of multi-rooted transplants. This study indicates that orthodontic extrusion and minor lateral movements of autotransplanted immature third molars, as well as rotation of single-rooted third-molar transplants, represent no additional risk to transplant survival. In contrast, rotation of multi-rooted transplants seems to initiate later severance of the vascular and nerval supply to the pulp.

Adolescent↗
PubMed2006

Interrelation between endodontic status, pathologic cemental granules and periodontal ligament adhering to the root of extracted teeth.

OBJECTIVES: To evaluate if the endodontic status has influence on the adherence of periodontal ligament (PDL) to extracted teeth and if the presence of "pathologic granules" is correlated to the endodontic status and/or the amount of adhering PDL. STUDY DESIGN: Extracted teeth with different endodontic status and exhibiting no marginal periodontitis were histologically examined. RESULTS: Observation of pathologic granules was related to a nonvital endodontium and to acute peroperative inflammation. Pathologic granules and denudation of the extracted roots were significantly related. Acute peroperative inflammation and low extraction forces were related to denudation of the roots. Such relation was not found for endodontic status, tooth type, root-form, and age of patients. CONCLUSION: The existence of pathologic granules in unexposed cementum is strictly related to teeth with a nonvital endodontium. There is no effect of the endodontic status on the adherence of PDL when an acute inflammation is absent.

Adolescent↗
PubMed1979

Radiographic findings in 224Ra-caused dental resorptions.

Dental resorptions as a delayed effect of Thorium X (224Ra) were observed in four patients. The radiographic findings showed distinct and representative patterns. Apparently, the observed changes are typical for delayed alterations related to 224Ra-specific disturbances in the alveolar process. Degenerative and inflammatory reactions may also be involved in the pathogenesis.

Adult↗