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At least 55 records · Page 3Linked to original sources
PubMed1979

[Delayed eruption of the premolar after pathological deciduous tooth root resorption].

The behaviour of eruption of lower premolars after pathological resorption of deciduous molar roots was examined on models and X-rays. The molars of the first dentition were shed earlier after pathological resorption of deciduous molar roots. Data of absence are measured in years in the presence of occlusal bone bridges. The middle values are more than three years. Eruption of permanent teeth happens years later or they remain impacted. Eruption dates of premolars after pathological deciduous root resorption and interruption of the lamina dura, and after physiological resorption are significantly earlier than if there is an occlusal bony bridge (p less than 0.01). The therapeutic consequence is the surgical liberation of such premolars and their removal.

Alveolar Process↗
PubMed1992

Bone and root resorption. Effects of the force developed during periodontal ligament injections in dogs.

The purpose of this study was to determine the role of the pressure generated during the intraligamentary injection technique on the occurrence of root and bone resorptions in dogs. Five beagles were used in the study, and interventions were scheduled to provide observation periods at 7, 25, and 45 days. One hundred five sites on the dogs were divided into three groups: (1) those subjected to needle penetration; (2) those subjected to saline solution injection; and (3) the control sites. Injections were made with a specially designed syringe equipped with a miniaturized force transducer. The dogs were then killed, and block sections of the sites were made and treated in accord with standard histologic procedures. The mean number of osteoclasts and odontoclasts was calculated for each group, and the mean value of bone and tooth resorption angle was measured. Data were then analyzed statistically. Results showed that, at 7 days, needle penetration and saline solution injection caused osteoclastic activity and bone resorption; the number of osteoclasts and the extent bone resorption were greater in the group that received the injection of saline solution. No difference was found for the odontoclastic activity and tooth resorption. A correlation was found between the force developed during injection, the mean number of osteoclasts, and the mean angle of bone and tooth resorption. At 25 and 45 days, healing had occurred. These findings suggest that fluid pressure within the periodontal ligament is sufficient to initiate osteoclastic, reversible bone resorption.

Alveolar Bone Loss↗
PubMed1989

[The prognosis of autologous tooth transplants in orthodontic treatment planning].

Autogenous tooth transplantation is an alternative treatment for preserving continuity of the dental arch following early loss of teeth. The prognosis of transplants determines the indication as compared with other methods of space closure. Transplanted buds of upper premolars as well as of lower third molars continue their root growth. The clinical and roentgenological analysis of 81 autogenously transplanted upper canines, following different operative procedures, indicates, that 50% of the transplants remain in situ for five years and only 25% remain in situ longer than six years. The statistical chances of survival of vitally transplanted, apicoectomied teeth are more favourable. Short-term prognosis is determined by inflammatory bone and/or tooth resorption due to odontogenic infection or occlusal trauma. Long-time prognosis is determined by different forms of tooth resorption. Regular radiographic examination as reveal early odontogenic infections which can then be treated endodontically. The doubtful prognosis necessitates strict indications.

Adolescent↗
PubMed1989

Pathophysiological and therapeutic aspects of dentoalveolar resorption.

Both physiological and pathological forms of bone and tooth resorption are seen in the dentoalveolar complex, and much of the non-restorative component of a clinician's work is occupied by problems related to loss of bone or dentine. Bone resorption is also a feature of many systemic diseases, some of which can affect the alveolar bone. The aim of this report is to summarize some recent work in which the dentoalveolar complex has been used as a model system to study physiological, pathological and therapeutic aspects of resorption of bone and dentine.

Bone Resorption↗
PubMed1990

[Experimental study of bone resorption after tooth extraction with implanted hydroxyapatite tooth root substitute].

Hydroxyapatite (HAP) tooth root substitute implantation have been applied to extraction sockets in many studies for purpose of preservating alveolar bone. Dimensional changes were measured with sectioned study cast of cephalometric X-ray photo. In this study, dimensional changes were determined by newly developed evaluation system which utilizing image analyzer (Immunomedica Co., Ltd.), in a view of conserving alveolar ridges beneath the denture base. Cone shaped HAP tooth roots (5 or 6 mm in length) were implanted to one subject and disk-like shaped HAP tooth roots (2 mm in length) were also implanted to the other subject. Preservation of alveolar bone was observed in both shaped HAP tooth roots implanted site compared to control site. Bony ankylosis between HAP tooth root and alveolar bone, observed on 1 month after histological specimens, may contribute to this result. Smaller changes of blood flow compared to controls were obtained on implanted site, which were measured with Laser Doppler blood flow meter (Perimed KB; Sweden) on buccal mucosa. We consider that HAP shows good biocompatibility and HAP tooth roots implantation decrease the wound volume consequently.

Alveolar Bone Loss↗
PubMed1977

[Pathological tooth root resorption and its clinical significance].

The author examined 316 teeth, on which total pulpotomy had been performed, for frequency and extent of resorption. Marked resorptions, always associated with chronic apical periodontitis, were radiographically disclosed in 43 teeth. It is pointed out that the clinical radiographic technique permits to visualize only resorptions of greater extent.

Dental Pulp Devitalization↗
PubMed1989

Disturbances of tooth form and eruption in the microphthalmic (mi) mouse: a light and electron microscopic study.

Changes in the surrounding alveolar bone occur during tooth eruption. The microphthalmic (mi/mi) mouse suffers from osteopetrosis and lack of bone resorption; tooth form and eruption were examined in both affected mi/mi mice and unaffected litter-mates to determine the effect of osteopetrosis on tooth development and eruption. Paraffin sections of mandibles from 3, 7, 10, 13, 15 and 20-day-old mice were examined by light microscopy after staining with haematoxylin and eosin and for stable acid phosphatase activity. Mandibles from 15- and 20-day-old mice were examined by scanning electron microscopy. The ultrastructure of odontoblasts was observed in 15-day-old mice. Tooth eruption was significantly reduced in the mi/mi mice; the bone of affected mice increased in area with increasing age and marrow spaces narrowed. There was little bony remodeling in the mi/mi mouse, as indicated by layers of reversal lines. This lack of bone resorption affected tooth eruption and root formation. No abnormalities were detected in odontoblasts, suggesting functional normality, but the wide predentine layer in the mi/mi mouse may indicate an alteration in dentine mineralization.

Animals↗
PubMed1990

[Changes of vibration frequency due to root resorption of deciduous tooth].

The purpose of this study was to investigate the changes of vibration frequency of a deciduous tooth due to physiological root resorption. The author developed an analysis system for tooth vibration by applying an impact-hammer to the tooth. Peak frequency (Hz) of the tooth stimulated by the impact-hammer was observed by the analysis system. The following results were obtained: 1) Peak frequency of the tooth vibration shifted to a lower range according to the root resorption both in vitro (simulation model) and in vivo (15 children) and a high positive correlation was found between the peak frequency and the crown-root length ratio (r = 0.840). 2) A cause of the frequency shift to the lower range was not related to the tooth weight but to the change of tooth gravity due to the root resorption. 3) It was considered that the vibration analysis system could be useful on measuring tooth mobility in vivo and in clinic as well.

Child↗
PubMed1986

Autotransplantation of maxillary canine teeth. A follow-up of 35 cases up to 4 years.

35 cases of autotransplantation of nonendodontically treated maxillary canines were followed for up to 4 years and were assessed according to loss of the transplanted tooth, onset of sensibility, mobility, intact lamina dura and presence of tooth resorption. The results of this study compare favourably with other studies and favour the hypothesis that little is to be gained by not endodontically treating autotransplanted teeth immediately after splint removal. It is also suggested that immobilization by means of a rigid splint, removing the tooth from occlusal forces, may account for the relatively low incidence of resorption in this series.

Adolescent↗