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Biomedical subjects

R M Meffert

Publications and source records attributed to R M Meffert.

At least 73 records · Page 4Linked to original sources
PubMed1986

Endosseous dental implantology from the periodontist's viewpoint.

Oral implantology has been a controversial dental therapeutic procedure for many years. Periodontics, as a specialty, did not really get involved until the word, osseointegration, was placed in the implant nomenclature by Dr. Per-Ingvar Branemark and the attendant success rate for osseointegrated prostheses was presented in a fully documented format. In March 1985, the definition of the scope of periodontics was provisionally changed by the Executive Council of the American Academy of Periodontology to include the discipline of oral implantology. Requirements for Advanced Specialty Education Programs in Periodontics with an effective date of January 1, 1986, include a statement as to the desirability of including implantology in some form in the postdoctoral curriculum. Many implant materials and designs are presently being used in endosseous dental implantology; studies are in progress to evaluate the short- and long-term response of hard and soft tissues to these materials. Continuing, nonbiased research is needed to fully understand and use this promising modality.

Aluminum Oxide↗
PubMed1985

Hydroxylapatite as an alloplastic graft in the treatment of human periodontal osseous defects.

Twelve patients, 32 to 60 years of age, received a polycrystalline ceramic form of pure dense hydroxylapatite as an alloplastic bone implant material in intrabony defects following reflection of full mucoperiosteal flaps, root planing and defect-curettement. The defects were measured from an acrylic stent, using an endodontic silver point which was placed to the base of the defect. Similarly, debrided and curetted defects in the same patients were not implanted and served as controls. Recalls for documentation and plaque control were at 1, 2, and 4 weeks, and at 3, 6 and 9 months. Measurements relating to changes in defect-depth were made upon reentry at 9 months. The twelve defects, serving as controls, showed very little difference between the pretherapy and 9-month measurements. The initial mean measurement from the base of the defect to the highest alveolar crest was 4.27 mm and the 9-month mean measurement after curettage only was 3.36 mm. In terms of resolution of the original defect this amounted to 19.49% reduction, but a 0.46-mm mean loss in height of the alveolar crest provided an actual percentage fill of the original defect of 9.91%. Of sixteen experimental defects, the same initial mean measurement from the base of the defect to the highest alveolar crest was 5.18 mm and the 9-month mean measurement after grafting was 2.43 mm. In terms of resolution of the original defect, this amounted to a 53.57% reduction, but in contradistinction to the curettage sites, a mean increase in height of the highest alveolar crest of 0.61 mm gave a true percentage fill of the original defect of 66.89%. At the 9-month reentry, the implanted mass seemed to be partially "calcified" and was resistant to penetration with a probe or removal with a curette. The data and clinical impression strongly suggest that hydroxylapatite has a potential as an alloplastic implant with clinically apparent acceptance by the soft and hard tissues.

Adult↗
PubMed1984

The pulpal response to topically applied citric acid.

Citric acid is currently being used to aid in the reattachment of periodontal tissues to tooth roots which have become separated as a result of periodontitis. The present study examines the effect of topically applied citric acid on the dental pulp. Citric acid, pH 1, was applied for 3 minutes on instrumented premolar teeth in six dogs. As a control, saline solution was applied on similarly instrumented premolars. The teeth were removed 1, 6, 24, 48, 72, and 144 hours after citric acid application. After histologic preparation, the pulps were examined for inflammatory cell infiltrates, odontoblast displacement into the dentinal tubules, hyperemic capillaries in the odontoblast layer, hemorrhage, abscess formation, irregular dentin, and the thickness of the dentin remaining beneath the treated area. There was no statistically significant response to the citric acid over the saline controls. Nor was the pulpal response, as examined above, correlated to the thickness of the remaining dentin. The results suggest that citric acid, pH 1, when applied to tooth roots during surgical reattachment therapy, does not adversely affect the pulp.

Administration, Topical↗
PubMedDate not supplied

Treatment of implants demonstrating periapical radiolucencies.

This article presents two implant cases where a periapical radiolucency developed, with a sinus tract, while the implants were still submerged. A corrective surgical treatment for these unique lesions is detailed, and the possible etiologies are discussed.

Aged↗