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Results for “Root Resorption”

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PubMed1989

[Apical root resorption during orthodontic treatment].

Pre- and posttreatment radiographs of 2050 orthodontically treated patients were examined and apical root resorptions of more than 2 mm were identified. 30 patients (211 teeth) were affected. Treatment characteristics and objectives of this group (with severe apical root resorption) were compared to a treated group of 30 patients (with no resorption) to determine clinical risk factors. Extrusion, but especially jiggling and a long treatment period were found to be significantly more frequent in the group exhibiting resorption than in the control group. Pathogenesis of treatment-induced root resorption is discussed in respect to histological results.

Adolescent↗

PubMed1988

Early post-operative endodontic therapy limits inflammatory root resorption of autotransplanted maxillary canine teeth.

This study has provided information concerning the limitation of inflammatory root resorption of autotransplanted maxillary canine teeth. It has been shown that early post-operative endodontic therapy significantly decreases the occurrence of inflammatory root resorption (P less than 0.001) but does not change the prevalence of replacement root resorption. It is argued that by limiting inflammatory resorption the prognosis for autotransplanted teeth is considerably improved.

Adolescent↗

PubMed1989

Effect of placement of occlusive membranes on root resorption and bone regeneration during healing of circumferential periodontal defects in dogs.

Previous studies indicate that root resorption is a frequent sequela to significant amounts of periodontal repair in animal models. A model was developed in labrador dogs to study periodontal wound healing in large circumferential defects in the absence of influence from the oral environment. A polytetrafluorethylene membrane of 1 micron pore size (GORE-TEX) was used to occlude cells from specific tissues from populating the healing dentin-connective tissue wound. 3 modalities were studied: (1) control, in which no membrane and therefore no cell occlusion was used, (2) flap occlusion, in which the internal surface of the flap was lined with the membrane preventing contribution of cells from the flap, (3) bone occlusion, in which the reduced alveolar bone was lined with the membrane preventing contribution from bone cells. Wound closure included total submergence of teeth and membranes. The membranes remained incorporated and no exposure of membranes or teeth occurred during the 3 months healing period. Histology revealed bone regrowth in all 3 treatment modalities. It is suggested that inductive elements in the connective tissue or dentin, or bone cells from periosteum were responsible for bone regrowth in the bone membrane treatment modality. No significant difference was seen for root resorption between the 3 treatment modalities. This study found that physical occlusion of cells from the inside of the surgical flap, or from the pre-existing bone, is not sufficient to prevent root resorption in periodontal wound healing.

Alveolar Process↗

PubMed1991

Patient characteristics and treatment variables associated with apical root resorption during orthodontic treatment.

Multivariate analysis of patient characteristics and clinical variables was carried out with the maximum single maxillary incisor apical root resorption for each patient as the dependent variable. Root lengths were measured in standardized intraoral radiographs from 485 consecutively treated patients, 11.5 to 25 years of age. The correlation matrix revealed a complex pattern of positive and negative associations between the six pretreatment and seven treatment variables. Variables found to contribute significantly to apical root resorption were overjet, history of trauma to maxillary incisors before initiation of treatment, time of treatment with rectangular arch wires, time of treatment with Class II elastics, lip/tongue dysfunction, and/or history of finger-sucking habits persisting beyond the age of 7 years, and impacted maxillary canines to be corrected orthodontically. Clinical application of an open activator was significantly correlated with overjet but negatively correlated with apical root resorption, with the use of rectangular arch wires and/or Class II elastics, and with total banding time.

Adolescent↗

PubMed1984

Potentials for root resorption during periodontal wound healing.

The present study was undertaken to examine whether (1) the process of resorption, which invariably affects periodontitis involved reimplanted roots facing bone or gingival connective tissue during healing, is a transient phenomenon and, (2) root resorption can be prevented by permitting downgrowth of epithelium along the root surface. A total of 24 teeth in 2 monkeys (Macaca cynomolgus) was subjected to experimental periodontal tissue breakdown by the placement of elastic ligatures around the teeth. The ligatures were left in situ until about 50% of the supporting tissues had been lost. Following removal of the ligatures, the teeth were extracted and the denuded portions of the roots were scaled and planed. The crowns of the teeth were resected and the root canals filled with guttapercha. The roots were subsequently implanted into sockets prepared in the jaw bone in such a way that each root was embedded in bone except for a portion which was in contact with gingival connective tissue. 1 month prior to sacrifice of the animals, the cut surface of the coronal part of the roots was exposed by removal of the covering soft tissue. The epithelium was thereby allowed to migrate into the wound. Implantation of the roots was scheduled to provide healing periods of 1, 2, 3, 4, 8, 12, 16, 20 and 24 weeks before exposure of the roots. The histologic examination of the implant specimens disclosed that replacement resorption was a progressive process which eventually resulted in the elimination of the transplanted roots. It was possible to prevent root resorption in this model by permitting apical downgrowth of epithelium along the root surface during the initial phase of healing. The results are discussed in relation to procedures used in periodontal therapy.

Animals↗

PubMed1988

Multiple idiopathic external root resorption. A case report.

An unusual case of multiple idiopathic external apical root resorption affecting all four quadrants, in a patient with a history of narcotic intravenous drug addiction and liver disease, is reported. The literature relating to a systemic etiology for external root resorption is briefly reviewed.

Adult↗

PubMed1990

[Rates of root resorption in orthodontically moved, periodontally affected and healthy teeth].

The aim of this SEM-study was to obtain a quantitative analysis for comparing the extent of root resorption in orthodontically treated teeth, in teeth with reduced periodontium and in healthy teeth. By using a statistically valid method the highest amount of root resorption was established in orthodontically moved teeth. The teeth with loss of attachment showed a significantly higher amount of root resorption than healthy teeth. This finding complicates orthodontic treatment in teeth with reduced periodontal attachment.

Adolescent↗

PubMed1992

Assessment of external root resorption using digital subtraction radiography.

Digital subtraction radiography was investigated for its capability to detect and quantify experimentally produced external root resorptive defects in teeth. Using a long source to object X-ray technique and E-speed film, serial radiographs of teeth with artificial lesions in a dry human skull (soft tissue simulated) were obtained. Receiver operating characteristic analysis was used to evaluate the diagnostic performance for each imaging system (conventional versus subtraction). To explore the quantitative assessment potential of digital subtraction radiography, images were produced after sequential demineralization by HCl. The acid solution was analyzed for calcium concentration by atomic absorption spectrophotometry. Three-dimensional histogram quantification for each subtracted image was performed. In overall performance for detecting experimentally produced external root resorption, digital subtraction radiography was found to be significantly superior to conventional radiography. In addition, digital subtraction radiography can provide quantification of experimentally produced external root resorptive defects.

Humans↗

PubMed1977

Orthodontic root resorption studied by electron microscopy.

The present study supports previous findings that root resorption takes place simultaneously with and after the elimination of hyalinized tissue. The cementoid layer and the more mature periodontal collagen fibers adjacent to cementum are possible barriers preventing root resorption. The microenvironment around hyalinized tissue is favorable for the introduction of hard-tissue resorbing cells. The findings show that the elimination of hyalinized tissue leads to the removal of the cementoid and the mature collagen thus leaving a raw cemental surface without a barrier. It is therefore hypothesized that such an area is readily attacked by odontoclasts. Once resorption lacunae are established, the cementum is resorbed from the rear as an undermining process. By continued orthodontic force application the resorption process will proceed even after all hyalinized tissue is eliminated. If the orthodontic force is discontinued or falls under a certain level, the resorption lacunae are repaired.

Animals↗

PubMed1989

Multiple idiopathic root resorption in monozygotic twins: case report.

Idiopathic root resorption of the permanent dentition is encountered occasionally during routine dental examinations. A case is presented of this relatively rare condition in monozygotic twins. Examination of siblings and the patients' mother did not show a resorptive process. A 6-month follow-up examination revealed the resorption to be arrested.

Adolescent↗

PubMed1989

[Root resorption and endodontic treatment].

Some types of tooth root resorption respond favourably to endodontic treatment. Sometimes compromising factors demand particular treatment approaches and techniques. These will be described, in connection with their genesis.

Humans↗

PubMed1987

Histometric study of root resorption on human premolars following experimental replantation.

A histometric method was applied for evaluation of root resorption in 57 experimentally replanted teeth and 22 controls. Representative axiobuccolingual sections were selected for measurement of resorptions at a magnification of x 40. The frequency of root resorption in the control teeth was low. In replanted teeth marked resorptive activity elicited by the trauma appeared after 2 wk. The extent of active resorptions increased until the third postoperative week. On an average 14% of the root periphery was affected at this stage. After the sixth postoperative week progressive cement deposition took place in the resorption lacunae. Incidental ankylosis of the periodontal membrane also occurred from this observation time but there was no increase among the long-term groups.

Adolescent↗

PubMed1989

Root resorption in autotransplanted maxillary canine teeth.

The results of the endodontic management of root resorption in 77 transplanted teeth are described. Apical bony radiolucency healed in 75 per cent of cases but the prognosis for root resorption was poorer; in only 34 per cent of cases was the resorption arrested. Various factors which might have influenced the outcome of treatment are discussed.

Adolescent↗

PubMed1991

Root resorption after local injection of prostaglandin E2 during experimental tooth movement.

The purpose of this study was to investigate the occurrence of orthodontic root resorption in connection with local injection of prostaglandin E2 (PGE2). The material consisted of 25 male Wistar rats. The control group comprised six animals where no force was applied. In five animals 0.1 ml of 0.1 micrograms/microliter PGE2 was injected in the gingival area of the upper right first molar. In one animal no PGE2 was injected. The animals were killed after 3 days. The experimental tooth movement groups consisted of 19 animals. Duration of experiments was 3 days, 7 days, and 10 days. The maxillary first molars on both sides were each moved mesially by means of a coil spring. On the right side 0.1 ml of PGE2 0.1 micrograms/microliters was injected in the gingiva on the buccal side of the upper first molar on days 0, 3, 5, and 7. On the left side no injection of PGE2 was performed. In three animals in the 7-day group the vehicle (Waymouth medium) was injected. There was no significant difference in root resorption between the experimentally moved teeth with and without local injection of PGE2, but a trend towards more root resorption was registered on the teeth where such injections had been performed.

Animals↗

PubMed1985

Nailbiting: frequency and association with root resorption during orthodontic treatment.

The purpose of the present investigation was to determine the incidence and intensity of nailbiting and its possible role in root resorption during orthodontic treatment. A sample of 1365 boys and girls, aged 13-15 years old, were investigated about their nailbiting habits. The possible effect of nailbiting on root resorption during orthodontic treatment was evaluated by radiographic examination of two groups, matched with regard to overjet, age, sex, length and type of orthodontic treatment with fixed orthodontic appliances, one group consisting of 21 severe nailbiters and the other a group of 21 patients without the habit. Replies to questionnaires distributed to 340 boys and girls showed that the incidence of nailbiting was 45 per cent. The habit of severe nailbiting among 1025 of the children investigated was registered in 14.3 per cent. There was no significant difference regarding the habit between boys and girls. The apical root resorption index was significantly higher in the severe nailbiters before (p less than 0.01) and after (p less than 0.001) orthodontic treatment.

Adolescent↗

PubMed1980

Delayed replantation after submucosal storage in order to prevent root resorption after replantation. An experimental study in monkeys.

The purpose of this study was to determine the root resorption pattern of teeth autotransplanted to a submucosal site and to determine whether root resorption after replantation could be prevented by delayed replantation of teeth after submucosal storage in order to regenerate damaged periodontal ligament. Permanent teeth were extracted in green Vervet monkeys. One group of teeth was transplanted to a submucosal site and examined histologically in situ. Another group of teeth was autotransplanted to submucosal sites, recovered and replanted either 2 or 6 weeks later. The animals were sacrificed 8 week after replantation and examined histometrically. The following histologic parameters were registered: surface resorption, inflammatory resorption, replacement resorption (ankylosis), periapical inflammatory changes and downgrowth of pocket epithelium. Teeth autotransplanted to submucosal sites developed surface and inflammatory resorption. In half of the cases where teeth were transplanted with a vital periodontal ligaments new formation of bone took place adjacent to the transplant. Delayed replantation after submucosal burial was not found to inhibit the development of ankylosis, but changed the resorption type from direct apposition of bone upon the root surface to apposition of bone after initial resorption.

Animals↗

PubMed1984

Root resorption of upper permanent incisor caused by impacted canine. An analysis of 23 cases.

Unusual root resorption of 12 central and 11 lateral upper permanent incisors in 11 patients is described. The degree of resorption ranged from loss of the apical 1/4 to almost complete loss of root structure. Excepting 1 case, permanent canines were partially or completely impacted and their crowns were in close apposition to the resorbed surfaces of the incisors. The roots of the canines were either in the process of formation or completely formed. The findings suggest that the pressure from the canine which persists in moving downward despite the lack of space to permit normal eruption could cause root resorption of adjacent incisors even in the absence of systemic factors. Of 14 extracted incisors, 10 were replaced orthodontically by the impacted canines, whereas the spaces of the extracted incisors were restored by prosthetic means in the 4 other cases. 6 incisors were preserved without any treatment and 2 with the aid of a sapphire dento-osseous anchor pin. Since the resorbed incisors were mostly free of pain, early detection by radiographic examination is essential to establish a proper diagnosis.

Adolescent↗

PubMed1982

Root resorption following slow maxillary expansion.

In the present investigation the occurrence and nature of root resorption in patients treated with slow maxillary expansion appliances was studied with the aid of radiographs and histological sections from premolars. The radiographs failed to reveal any root resorption, but on the histological sections resorption lacunae were identified. Three types of resorption were distinguished: active, arrested and repaired. The majority of the resorption cavities were located on the bucco-marginal side of the premolars and were of the arrested or repaired type. Examination in polarized light revealed that the reparative cementum was different from normal cementum and that no new attachment had been established between the principal fibres in the periodontal ligament and the reparative cementum.

Adolescent↗