Effect of Metal Salts in Prolonging Antibacterial Activity of Teeth Treated with 8‐Hydroxyquinoline

METHODOLOGY AND CRITERIA IN THE EVALUATION OF DENTAL IMPLANTS Neuman, G . , Spangberg, L . , and Langeland, K . J Endodont 1: 193, June, 1975. Thirty-six guinea pigs were used to test the reaction of hard and soft tissue to three different endosseous implant materials, Teflon, Titanium 6A1-4V, and Vitall ium. Observations were made at 2 and 12 weeks. Implants were of two types: those exposed to the oral environment and those unexposed. Findings indicate inflammatory response significantly greater in exposed implants regardless of the implant material used. In exposed implants, epithelium, continuous with the oral mucosa, was found in the lumen around the implant. The findings suggested that bacterial access along the exposed implant was an important factor in the bio-acceptability of the implant. The study indicated that implant materials which prevent deposition of plaque should be sought, especially where the implant will be exposed to the oral environment. Department of Endodontics, University of Connecticut, School of Dental Medicine, Farmington, Connecticut 06032 Dr . J . Leary DENTAL PLAQUE REDUCTION WITH AN ANTIBACTERIAL MOUTHRINSE. ULTRASTRUCTURAL, MICROBIOLOGICAL, AND BIOCHEMICAL CHANGES Brady, J . M . , Gross, A . , Grower, M . F . , Carter, H . G . , and Barnes, G . P. J Prevent Dent 2: 10, July-August, 1975. A n ultrastructural biochemical and microbiological analysis of plaque was done 5 days after treatment with alexidine (QR-711) used as a mouthrinse for 1 minute daily on 17 males. Plaque prior to treatment, plaque which was allowed to grow after a prophylaxis, and plaque where no prophylaxis had been done (control) was examined. Results showed a marked decrease in plaque wet weight, plaque dry weight, protein content and alkali-extractable protein. There was also a change in the types of colonies of organisms with an increase of dense, small coccal forms. U.S. Army Institute of Dental Research, Walter Reed Army Medical Center, Washington, DC 20012 Dr . H . Israelson TEMPOROMANDIBULAR ANKYLOSIS SECONDARY TO RHEUMATOID ARTHRITIS. REPORT OF A CASE Seymour, R . L . , Crouse, V . L . , and Irby, W . B. Oral Surg 40: 584, November, 1975. About 50% of all cases of rheumatoid arthritis show involvement of the temporamandibular joint ( T M J ) . Ankylosis may occur when the T M J is involved by rheumatoid arthritis during childhood. A 16-year- old Negro boy was admitted because of restricted mandibular opening, and diagnosed as juvenile rheumatoid arthritis with partial ankylosis of the right T M J , which showed bony union of the right mandibular condyle and glenoid fossa. A silicone rubber block was placed between the proximal and distal segments of the ascending ramus and was held in place with a transosseous wire, resulting in a mandibular opening of 20 mm. A n exercise appliance was constructed but failed in use. Three years later the patient returned with a mandibular opening of about 2 mm. The ankylosis occurred anterior and medial to the implant and another rubber implant was placed, resulting in the intraoperative mandibular opening of 18 mm. Another exercise appliance was made and there was a 23-mm opening 4 months postoperatively. With the surgical treatment and postoperative regime (appliance and motiva- tion), an adequate oral opening may be maintained. Department of Oral Surgery, College of Dental Medicine, Medical University of South Carolina, 80 Barre Street, Charleston, SC 29401