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Biomedical subjects

R W Comer

Publications and source records attributed to R W Comer.

34 records · Page 2Linked to original sources
PubMed1987

Combining resin-bonded prostheses and removable partial dentures: report of case.

The resin-bonded prosthesis provides an alternative for tooth replacement in that the prosthesis can be combined with other dentures. The prosthesis was used conservatively in this case, with modified abutment teeth to improve the function of the removable partial denture. Decreased expense, shorter chair time, and the noninvasive nature of the procedure make the prosthesis an option for patients with special problems.

Acid Etching, Dental↗
PubMedDate not supplied

Oral hygiene for the severely handicapped: clinical evaluation of the University of Mississippi dental care system.

The study reported here was a clinical evaluation of an automatic toothbrushing device for persons with severe handicapping conditions. This device, the University of Mississippi dental care system, is designed for patients who are unable to control their arms and hands. The effectiveness of this device was compared to routine (ordinary, manual) regimens of oral hygiene through use of gingival (Loe-Silness) and plaque (Turesky) indexes (GIs, PIs). Plaque indexes for patients under routine care averaged 2.11; PIs for patients under the dental care system averaged 1.47. Based on Ebbutt's extra period changeover design model, the t-test for difference in plaque scores is significant (P less than .001). The results indicate that the University of Mississippi dental care system improves the patients' ability to independently control plaque.

Persons with Disabilities↗
PubMedDate not supplied

Pseudo-dental pain and sensitivity to percussion.

Two case reports examine a little-known cause of dental pain and sensitivity to percussion. Contrary to the traditional assumption that pain and sensitivity to percussion almost always are diagnostic of pulpal inflammation and/or necrosis, these symptoms actually may be referred to the sensitive tooth from trigger points in the masticatory muscles. Therefore, myofascial pain syndrome must be ruled out in patients who have dental pain and display sensitivity to percussion.

Adult↗
PubMedDate not supplied

Enigmatic pain referred to the teeth and jaws.

A number of obscure syndromes can mimic dental or jaw pain in the absence of pathosis within these structures. This enigmatic dental pain includes conditions such as pretrigeminal neuralgia, complex regional pain syndrome, temporal tendinitis, and carotodynia. Each of these syndromes is described through a pertinent case report to illustrate appropriate diagnosis and treatment.

Adult↗
PubMedDate not supplied

Dentin permeability: sealing the dentin in crown preparations.

Provisional restorations of full crown preparations may permit more microleakage of bacteria and their products than the final castings do. However, most investigations of the sealing qualities of cemented castings have reported that they too permit dye leakage. One approach to the problem is to seal the dentin with dentin bonding agents at the completion of the crown preparation. This study evaluated the ability of six different dentin bonding agents to seal the dentin of crown preparations of human teeth in vitro using two independent techniques. The first technique quantitated fluid filtration across dentin before and after treatment with dentin bonding agents at one hour, one day, one week, and one month and after thermocycling. The second method measured silver nitrate penetration of the thin veneers of dentin bonding agents into the dentin. Both methods correlated well with each other. The best seals were obtained with Prisma Universal Bond 2 or Superbond powder plus liquid. The worst seals were found using Gluma and Superbond liquid only. Clearfil PhotoBond, Amalgambond, and Scotchbond 2 gave intermediate results. Although the dentin bonding agents tend to accumulate on chamfers, thereby increasing their thickness to 200-300 microns, the method looks promising as a simple way to protect the pulp from the consequences of microleakage.

Analysis of Variance↗
PubMedDate not supplied

Amalgam buildups: shear strength and dentin sealing properties.

The retentive strength and sealing properties of amalgam buildups were compared in vitro in three groups of specimens. All teeth were prepared with flat, nonretentive surfaces. In the first group, the amalgam buildups were retained by four self-threading Minim pins. In the second group, retention was provided by a circumferential slot prepared in the dentin just inside the DEJ. The third group utilized an adhesive resin for retention. Dentin permeability was measured as a hydraulic conductance before and after placement of the amalgam buildups and before and after thermocycling. All methods of retention sealed dentin very well even in the absence of cavity varnish. The 90 degree retentive strength was: pins, 10.3 +/- 0.9 MPa; slots, 4.1 +/- 0.5 MPa; resin, 3.1 +/- 0.8 MPa (mean +/- SEM).

Adolescent↗