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Biomedical subjects

F S Weine

Publications and source records attributed to F S Weine.

At least 37 records · Page 2Linked to original sources
PubMed1992

Sealing ability of Thermafil with and without sealer.

The purpose of this study was to evaluate the apical sealing ability of root canals filled using three obturating techniques. Sixteen maxillary first molars were obturated with Thermafil, 16 with Thermafil and a ZOE sealer, and 16 with laterally condensed gutta-percha. Two canal instrumentation methods were used, conventional step-back preparation with K-Flex files and traditional instrumentation combining reaming with reamers and filing with K-Flex files. Following obturation, the teeth were prepared for evaluation of the seal using India ink and a Profile Projector. The depth of penetration of the dye was statistically evaluated for each of the three roots with an analysis of variance. For sealing ability, there was no significant difference at the p < 0.05 level between the conventional step-back preparation and the traditional instrumentation technique. However, a significant difference was present at the p < 0.05 level for the obturation techniques. The mean linear dye penetration for the Thermafil technique was greater than that for lateral condensation.

Dental Leakage↗
PubMed1992

Long-term evaluation of surgically placed amalgam fillings.

The coauthors of this article had developed the clinical impression that whereas surgically placed amalgam fillings are successful on a short-term basis, the long-term prognosis for these cases may not be nearly as favorable. In order to test this hypothesis, as many patients as could be contacted, either directly or indirectly, who had been treated before 1981 were evaluated. Excluded from this study were cases for which failure could be attributed to any reason other than failure from the amalgam reverse filling. Therefore, all cases included had to demonstrate periapical healing prior to ultimate breakdown. On this basis, 60 of 104 teeth (57.7%) were considered to be successful and 44 teeth (42.3%) were determined to be failures.

Dental Amalgam↗
PubMed1991

Retrospective study of tapered, smooth post systems in place for 10 years or more.

A total of 211 consecutive patients of a restorative dentist who received full-mouth radiographs between October 1988 and March 1989 were screened for teeth treated endodontically at least 10 years earlier. In all, 51 patients had 138 teeth treated and restored by the authors. All involved teeth were restored with tapered smooth posts, cores with complete or 7/8 cast ferrules, and an onlay or cast precious metal crown (with or without veneering). No posts, splints, or bridges were loose, and only one crown was loose. There were nine failures in 138 teeth (6.5%)--three restorative, two endodontic, two root fractures, and two periodontal. When tapered smooth posts are used properly, retentive problems do not occur.

Follow-Up Studies↗
PubMed1991

The significance of needle gauge in dental injections.

Dentists administer injections on a routine basis with minimal consideration given to the needle used. Patients often associate pain with injections. Gauge is the measuring standard used in needle width classification. Despite the institution of American National Standards Institute/American Dental Association (ANSI/ADA) specification no. 54, variables still exist in classification of needles. The authors describe inside and outside diameters of the needle, ability to aspirate, and effect of needle size on pain, and offer suggestions for needle selection.

Anesthesia, Dental↗
PubMed1984

Somatotopic organization and transmedian pathways of the rat trigeminal ganglion.

The localization of neuronal cell bodies in the trigeminal ganglion for the pulpal nerves of incisors and first and second molars in the rat was determined by utilization of retrograde axonal transport of horseradish peroxidase. Transmedian labeling was found with all teeth, but labeling was greater in the ipsilateral ganglion.

Animals↗
PubMed1984

The enigma of the lateral canal.

It is difficult to summarize an article of this type, in which the author is certain that his case has been presented fairly, but is aware that other views that are contrary could be stated and endorsed by pertinent clinical cases. Bearing this fact in mind, I wish to reiterate the following: Lateral canals are demonstrated in endodontic cases with much less frequency than they exist. This variance rarely, if ever, causes an endodontic failure. Some demonstrated lateral canals may really be other conditions. Preoperative evaluation should include examination of radiographs for lateral, as well as periapical, lesions. Lateral canals may be demonstrated by a variety of filling techniques. Careful canal preparation may enhance the frequency of such demonstration. Cases with necrotic pulps probably yield more frequent demonstration than do cases with vital pulps. Lateral canals harboring inflamed and/or infected material may cause pain during endodontic treatment. They may simulate periodontal disease and may cause problems with treatment if present when a tooth is left open for drainage. Periodontal disease may cause pulp exposure via lateral canals located coronally. Improper use of post room may lead to lateral failure from breakdown of tissue in a lateral canal. The enigma of the lateral canal has been the object of description and discussion in many articles, but no one is truly certain of their exact significance in endodontic therapy for the long haul.

Dental Pulp Cavity↗