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At least 343 records · Page 19Linked to original sources
PubMed1989

A comparison between xeroradiographs and conventional radiographs as an aid in root canal therapy for maxillary molars.

The purpose of this study was to compare the quality of images obtained with dental xeroradiography to that obtained with conventional dental radiography during performance of root canal therapy on maxillary molars. For each step requiring radiographic information during endodontic treatment of 12 maxillary molars, a conventional radiograph and a xeroradiograph were made. This produced four pairs of images for each tooth treated as follows: (1) preoperative, (2) initial files for length determination, (3) master cones fitted, and (4) completed obturation of the root canal systems. The same x-ray machine was used as the source of radiation for all exposures with a setting of 70 kVp and 15 mA and with near identical projection for each pair of images achieved through use of a modified film holder and a custom positioning occlusal index made for each patient. Exposure time for the radiographs was 60 impulses (1 impulse = 1/60 second) and for the xeroradiographs it was 42 impulses. Images of structures and items important in endodontic diagnosis and treatment were rated as unacceptable (0), poor (1), adequate (2), or optimal (3) by four independent evaluators. Analysis of data showed the following: images of bone trabeculae, periodontal ligament spaces, root morphology, root apices, and fine bony abnormalities were judged to be significantly better in the radiographs than in the xeroradiographs (p less than 0.01) whereas there were no significant differences in image quality of pulp chamber morphology, root canal morphology, metallic measuring instruments, or endodontic filling materials.

Adult↗
PubMed1990

Uncontrolled bleeding during endodontic treatment as the first symptoms for diagnosing von Willebrand's disease. A case report.

Von Willebrand's disease has been established as the most common hereditary hemorrhagic disease. Endodontic treatment, when possible, rather than extraction is the treatment of choice in patients suffering from such a disease. A case is presented in which, during regular endodontic treatment, uncontrollable bleeding occurred, suggestive of a generalized bleeding disorder. A thorough hematologic examination revealed von Willebrand's disease, which the patient was not aware of. The dental surgeon can play an important role in the diagnosis and treatment of such patients.

Adult↗
PubMed1992

Postoperative pain incidence related to the type of emergency treatment of symptomatic pulpitis.

Some endodontic emergencies occur as a result of attempts to relieve symptoms of pulpitis. The aim of this study was to identify any predictor of postoperative pain in a patient population treated by dental students. Patients who reported for treatment of symptomatic pulpitis were subjected to three different emergency treatment regimens. Clinical data was collected on those patients who reported in the emergency service with severe postoperative pain within 24 hours of emergency endodontic treatment. Statistical analysis of these data suggested that the type of endodontic emergency procedure carried out was a significant predictor of severe postoperative pain.

Adolescent↗
PubMedDate not supplied

Effect of mechanical removal of the pulp upon the retention of odontoblasts around the pulp chamber of human third molars.

The pulp chambers of 11 freshly extracted human third molars were exposed by cutting off the roots apical to the cervical margin and the pulps were either removed with forceps and discarded or left in situ. The teeth were fixed, demineralized, divided longitudinally, embedded in resin and 2-micron sections stained with toluidine blue were examined by light microscopy. In pulp-removed specimens the percentage retention of the odontoblast layer with the predentine varied near the longitudinal division but when sectioned deeper all six specimens displayed 100% retention. The intactness of the retained odontoblast layer was mostly good as judged by the mutual close apposition of the distal ends of the cell bodies and their relation to the predentine. The retention of the odontoblast layer with the predentine may be due to the distribution of fibronectin, which others have shown is present between odontoblasts, and between odontoblasts and predentine, but lacking beneath the odontoblast layer.

Cell Adhesion↗
PubMed1994

Elimination of infection in pulpectomized deciduous teeth: a short-term study using iodoform paste.

This study was conducted to retain the pulp-involved deciduous teeth in dental arches and were restored to function by elimination of infection in pulpectomized deciduous teeth using iodoform paste. Clinically the teeth were evaluated for pain, mobility, and presence or absence of sinus for 3 months. We concluded that the iodoform paste is a suitable root canal filling material for single-visit pulp canal treatment in chronic pulp-infected deciduous teeth.

Anti-Infective Agents↗
PubMed1994

Scanning electron microscopic evaluation of different endodontic procedures on dentin morphology of human teeth.

Four manual endodontic instruments, an ultrasonic and an endosonic system were studied with a view to evaluating the morphology of the smear layer and the amount of debris and pulpal residues in the apical third of human extracted straight teeth from 55- to 75-yr-old patients. The manual instruments were K files, Ergoflex files used with the step-back technique, Canal Master with its own technique, and Flex-R with the Roane technique. The ultrasonic system was Suprasson Piezo and the endosonic was Excalibur. Human extracted teeth with straight canals were used and examined under a scanning electron microscope. All manual instrumentations showed a homogeneous compact smear layer and no pulp residues. No statistical differences were observed among the four manual techniques. Ultrasonic technique showed the complete removal of the smear layer, leaving small amounts of pulp debris at the apical third, while the Excalibur showed an almost complete elimination of the smear layer, leaving a homogeneous layer of pulpal residues along the canal.

Aged↗
PubMed1990

Treatment of the endodontic emergency: a decade later.

A questionnaire was sent to diplomates of the American Board of Endodontics to determine changing trends in the treatment of endodontic emergencies since Dorn's survey 10 yr ago. There is a definitely greater trend toward complete instrumentation of the root canals to the apex regardless of the emergency condition than there was a decade ago. The number of respondents who leave teeth open when the pulp is nonvital has dropped dramatically in the past decade. When there is no periapical involvement, over one third of the respondents are completing treatment in one visit. A decrease in the use of classic phenolic medicaments was noted with a corresponding increase in calcium hydroxide or no medication at all.

Calcium Hydroxide↗
PubMed1990

Comparison of balanced forces, endosonic, and step-back filing instrumentation techniques: quantification of extruded apical debris.

Randomly assigned groups of 15 single-canal, extracted human teeth were instrumented by one of three techniques: balanced forces, endosonic, or step-back filing. Debris extruded from the apical foramen during instrumentation was collected onto preweighed filters using a suction filtration apparatus. Following desiccation, weight determinations were made on an analytical electrobalance. A one-factor analysis of variance was performed on the debris weight data revealing that the endosonic technique apically extruded significantly more debris than the balanced forces technique (p less than 0.05). Further analysis of the data, excluding debris weights greater than 1 SD from the mean, using a one-factor analysis of variance revealed the balanced forces technique apically extruded significantly less debris than either endosonic or step-back filing techniques (p less than 0.05). No significant difference was demonstrated between endosonic and step-back filing techniques.

Analysis of Variance↗