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Biomedical subjects

E P Allen

Publications and source records attributed to E P Allen.

32 records · Page 2Linked to original sources
PubMed1991

Report of the Committee on Scientific Investigation of the American Academy of Restorative Dentistry.

Subjects of the past decade in the dental literature are reflected in this year's Committee report. We note the decrease in the prevalence of caries, the influence of dental implants, the advancements in dental materials, and the continued efforts to control adhesive events in the oral cavity. This year we included comments from and about many significant review articles published this past year. The Committee continues to be concerned about the quality of some of the work reported and the quality of the reporting. We have attempted to select the distinguished work, that which provides new information to our profession. The subjects covered include pulp biology, caries prevention, periodontics, implants, craniomandibular function and dysfunction, occlusion, and dental materials.

Dental Bonding↗
PubMed1989

Coronal positioning of existing gingiva: short term results in the treatment of shallow marginal tissue recession.

Although not a new procedure, coronal positioning of existing gingiva may be used to enhance esthetics and reduce sensitivity. Unfortunately when recession is minimal and the marginal tissue is healthy, many periodontists do not suggest treatment. This article outlines a simple surgical technique with the criteria for its use which results in a high degree of predictability and patient satisfaction.

Gingiva↗
PubMed1988

Use of mucogingival surgical procedures to enhance esthetics.

The procedures outlined herein deal primarily with improving esthetics. The importance of esthetics in periodontics is most apparent in patients with a high lip line. Current mucogingival procedures provide the surgeon with the capability to have a major role in the total treatment of complex restorative cases. Periodontal considerations must be included as an integral part of esthetic dentistry. A complete examination of the patient must include a thorough periodontal evaluation. In addition to the usual detection of periodontal pockets and inflammation indicative of periodontal disease, the examination should include a thorough mucogingival evaluation for detection of the following: (1) inadequate keratinized gingiva; (2) gingival recession; (3) excessive gingival display; (4) insufficient clinical crown length; (5) asymmetric gingival margins; (6) flat marginal contour; (7) improper gingival margin relationships; (8) lack of harmony of gingival margins with the lip line; and (9) alveolar ridge deficiencies. Mucogingival surgical procedures should be performed after control of all etiologic factors and in concert with the restorative therapy so that the surgery can produce the most desirable esthetic result. It must be understood that the location and contour of the gingival margin and its relationship to adjacent margins are as important to the final esthetic result as the location, form, and relationship of the incisal margins of the anterior teeth. Attention to the total dental display as framed by the smile, with appropriate mucogingival analysis and treatment, is necessary to achieve the most satisfying esthetic results.

Alveoloplasty↗
PubMed1987

Bovine bone morphogenetic protein (bBMP) fraction-induced repair of craniotomy defects in the rhesus monkey (Macaca speciosa).

Large cranial defects do not always heal spontaneously, especially in humans; often they have to be obturated with metallic or acrylic fillers. Bilateral cranial trephine defects, measuring 14-20 mm in diameter, were created in three Rhesus monkeys, providing a typical primate model system for investigations in comparative physiology of bone regeneration. Each skull had one control and one experimental trephine defect. Control defects were implanted with bovine serum albumin (BSA). Experimental defects were implanted with 100-200 mg of a partially purified fraction of bovine bone morphogenetic protein (bBMP) in two monkeys. In one monkey, the BMP was incorporated in a 1:1 poly(lactic) poly(glycollic) acid copolymer, high-viscosity formula. The animals were killed at eight weeks, ten weeks, and 16 weeks after implantation. The tissue responses were analyzed by computed histomorphometry and routine histologic examination. At each time interval, the BMP implanted defects produced more complete regeneration than the control implants. The morphogenetic response occurred in the following sequences: mesenchymal cell proliferation, chondrogenesis, and increased bone formation. BMP-induced osteogenesis may initiate the regenerative process. The copolymer releases BMP but may constitute a barrier to the end stages of replacement by new bone, and would be more useful in a low-viscosity rapidly biodegradable form.

Animals↗
PubMed1985

Improved technique for localized ridge augmentation. A report of 21 cases.

Topographical aberrations in a residual edentulous ridge often prevent establishment of a satisfactory pontic/ridge relationship. An improved technique is described for predictable augmentation of localized alveolar-ridge deficiencies. Results are reported from 21 cases involving 26 sites. All 14 sites using fibrous connective tissue grafts demonstrated shrinkage, although an improvement in residual ridge contour was obtained. Hydroxylapatite implant material was placed in 12 sites with shrinkage seen in only two sites. Advantages, requirements for success and technical considerations of the improved technique are discussed.

Alveolar Ridge Augmentation↗
PubMedDate not supplied

Pedicle flaps, gingival grafts, and connective tissue grafts in aesthetic treatment of gingival recession.

Gingival recession leading to exposure of crown margins or extensive areas of the tooth root can cause significant aesthetic difficulties. Surgical innovations over the last decade have enabled the periodontist to correct such problems with greater predictability and improved aesthetics. The current surgical procedures for treatment of gingival recession are described and illustrated, and criteria for selection of the appropriate procedure are presented. The learning objective of this article is a review of the surgical procedures and an increased predictability in implementation.

Connective Tissue↗