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At least 1,531 records · Page 85Linked to original sources
PubMed1996

The impacted maxillary canine. Further observations on aetiology, radiographic localization, prevention/interception of impaction, and when to suspect impaction.

Adjacent anomalous or missing maxillary lateral incisors have been implicated in the aetiology of palatally displaced canines by not providing proper guidance to the canine during its eruption. However, a recent review of the literature suggests that the aetiology of palatally displaced canines is genetic in origin. The aetiology of labially impacted canines differs, being due to inadequate arch space. Vertex occlusal radiographs have been recommended for localization but have limitations, and a case is illustrated where this radiograph is deceptive. The prevention/interception of a palatally displaced canine by the extraction of the deciduous canine is best carried out as early as the displacement is detected, mostly soon after 10 years of age. Usually, prevention/interception will avoid the surgical and orthodontic treatment needed to align a palatally impacted canine and may help prevent resorption of the adjacent incisor root. Suspicions that an impaction could occur or has occurred arise a) before the age of 10 years if there is a familial history and/or the maxillary lateral incisors are anomalous or missing; b) after the age of 10 years if there is asymmetry in palpation or a pronounced difference in eruption of canines between the left and right side; or the canines cannot be palpated and occlusal development is advanced; or, the lateral incisor is proclined and tipped distally; and, on a panoramic radiograph of the late mixed dentition if the incisal up of the canine overlaps the root of the lateral incisor.

Anodontia↗
PubMed2001

Ultrastructure of cementum and periodontal ligament after continuous intrusion in humans: a transmission electron microscopy study.

An ultrastructural study of the cementum and periodontal ligament (PDL) changes after continuous intrusion with two different and controlled forces in humans was carried out. Twelve first upper premolars, at stage 10 of Nolla, orthodontically indicated for extraction from six patients (mean age 15.3) were used. They were divided into three experimental groups, distributed intra-individually as follows: control (not moved), continuously intruded for 4 weeks with 50 or 100 cN force, utilizing a precise biomechanical model with nickel titanium super-elastic wires (NiTi-SE), which were developed and calibrated individually. The teeth were extracted, fixed, decalcified, and conventionally processed for examination in a Jeol 100 CX II transmission electron microscope. Evident signs of degeneration of cell structures, vascular components, and extracellular matrix (EM) of cementum and PDL were observed in all the intruded teeth, with more severe changes towards an apical direction and in proportion to the magnitude of force applied. Resorptive areas and an irregular root surface of the intruded teeth were noticed, according to the same pattern described above. Concomitant, areas of repair were also revealed in the cementum and PDL although the magnitude of forces remained the same throughout the experimental period. Thus, a reduction of continuous force magnitude should be considered to preserve the integrity of tissues.

Adolescent↗
PubMed1999

Deposition of calcified tissue around an overextended gutta-percha cone: case report.

CASE REPORT: Root canal treatment was performed in a mandibular right second premolar with a periapical lesion and apical resorption. The root canal was prepared with K-files using the step-back technique and 3% NaOCl as an irrigant; during obturation gross overfilling of gutta-percha occurred. The tooth was permanently restored with a post and core along with a crown. Although healing of the periapical lesion occurred and the patient reported that he was symptom-free, the tooth was extracted after 4 years because of a subgingival root fracture. Following extraction the tooth was examined with SEM. The examination revealed the presence of newly formed calcified tissue at resorption sites on the root apex. This newly formed tissue extended from the surface of the root around the apex to the extruded gutta-percha cone to which it was well adapted, forming a bridge between the cone and the root.

Adult↗
PubMed1995

Imaging of unerupted and displaced teeth by cross-sectional CT scans.

Thirty-six impacted and displaced teeth in 29 patients were examined radiographically by using orthopantomography (OPG) and computed tomography (CT). CT scans were obtained by using both a conventional program and a dental CT software program. The radiographic images obtained were compared for visualization of the internal position, inclination of unerupted teeth, and diagnosis of contact and doubtful or clearly visible resorption of adjacent roots. Both CT methods were superior to OPG. As far as the internal position and inclination of the impacted teeth, direct contact, and clearly visible resorption are concerned, the conventional CT program yielded the same information as the dental CT program. However, the exact proportional cross-sectional views obtained by dental CT yielded significantly (P < 0.01) better information about doubtful root resorption in adjacent teeth than did conventional CT.

Adolescent↗
PubMed1975

[The interesting case. 6-year follow-up of a patient with atypical root length of various teeth].

Six-year observations of a female patient (13 years of age at treatment beginning) in whom the roots of certain teeth were extremely short (the causes of which being unknown) revealed no changes in the degree of resorption and so further root resorptions. The growth of the roots of these teeth (which had not fully developed at treatment beginning) progressed without disturbances. The author is of opinion that these atypical root lengths are sequelae of a temporary disturbance of the process of growth, the causes of which are unknown.

Adolescent↗
PubMed1995

Crown amputation with intentional root retention for advanced feline resorptive lesions--a clinical study.

Whole tooth extraction is generally considered to be the treatment of choice for teeth with advanced feline external odontoclastic resorptive lesions. These teeth often have both a weakened, brittle crown and radicular ankylosis. These two factors cause frustration and sometimes complications during attempts at extraction. This study investigated the alternative of intentionally leaving part or all of non-pathologic tooth roots in situ to prevent iatrogenic trauma to the patient, loss of alveolar bone, and prolonged healing of surgical defects. Fifty one roots from 23 teeth were radiographed 5-36 months following elective root retention; continued resorption without surrounding bony reaction was seen in almost all cases. In one cat, the roots retained normal periodontal ligament one year later, and in another cat that developed severe stomatitis, the intentionally retained roots were extracted at the same time that the remaining molar teeth were extracted.

Alveolar Bone Loss↗
PubMed1995

An alternative treatment for the severely resorped maxillary lateral incisor: a sequela of ectopic eruption.

At times dental crowding, maxillary arch inadequacy, or an abnormal lingual or horizontal position restricts the eruption of the maxillary cuspid. This ectopic eruption can cause the canine to compress the blood supply to the periodontal tissues of the adjacent lateral incisor. If undiagnosed and untreated, physiological and chemical changes are induced, and the lateral root undergoes resorption. When the resorption is severe enough to endanger the retention of the lateral, an endeosseous stabilizer can be placed through the root and extended into the bone to stabilize the tooth artificially. Two cases demonstrate the technique and success of such treatment.

Adolescent↗
PubMed1980

The effect of root decalcification on the formation of "functionally" oriented collagen fibers.

It has been shown that "functionally" oriented collagen fibers will attach to cementum when a healthy root fragment is implanted subcutaneously in the rat along with decalcified autogenous bone. The purpose of the present study was to show how prior root decalcification affected this inductive action. Twenty-six pairs of bone and root were implanted in 13 200-gm, female, white, Sherman strain rats. The postoperative periods ranged from 1 week to 12 months. The results showed that root decalcification prevented formation of the "functionally" oriented fibers and inhibited bone induction by the decalcified autogenous bone. It was suggested that all roots have an inhibitor, the least amount in periodontally healthy roots and the most in periodontally diseased roots. It was suggested that the clinical successes in reattachment reported with acid treatment of roots were due to the denaturant effects rather than surface decalcification.

Animals↗
PubMed1998

Calcium hydroxide as a root canal filling material in primary teeth--a pilot study.

A pilot study was carried out in five mandibular primary molars using calcium hydroxide (Ca(OH)2) Paste as root canal filling material to find out an alternative to the routinely used zinc oxide eugenol (ZnOE), which is non-resorbable and causes deflection of succedaneous teeth. The six month clinical and radiographic follow-up carried out at 2 months interval, revealed that the treated teeth with Ca(OH)2 as root canal filling material were successful, showing no pain and tenderness to percussion. A tendency for decrease in size of radiolucency was seen. Two teeth showed complete healing of the periradicular radiolucency. Depletion of Ca(OH)2 paste was seen from the root canals even prior to physiological resorption of roots in 2 out of 5 treated teeth.

Calcium Hydroxide↗
PubMed2004

[Observation of osteoclasts on the root surface during human deciduous teeth resorption].

OBJECTIVE: To observe osteoclasts on the resorbing surface of human deciduous teeth. METHODS: After fixing the collected deciduous teeth, we prepared the tooth slices without decalcification, treated them with HE and TRAP dyestuff, and observed the osteoclasts under light and scanning electron microscope. RESULTS: There were large quantity of various forms of overlapping and huge osteoclasts with many nuclei and silk-like protuberances on the resorbing surface of deciduous teeth. The multinucleated osteoclasts align on the surface of coarse dentin. CONCLUSION: On the resorbing surface of human deciduous teeth there are large amount of osteoclasts which can be used as a source of studying human osteoclast.

Humans↗
PubMed1986

[Approach to age determination based on dental morphological criteria obtained in microradiography, stereomicroscopy and scanning electron microscopy].

The determination of the age owing to the morphology of permanent teeth has been done in 14 men and women, using criteria proposed by Gustafson. It was faithful, the difference between age determined by this method and the true age of these patients being never superior to 3 years. The application of scanning electron microscopy allows to improve some of the criteria used for this determination, especially that based upon the dentinal senescence.

Adult↗