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Biomedical subjects

D Buser

Publications and source records attributed to D Buser.

At least 91 records · Page 5Linked to original sources
PubMed1990

Suspected periodontopathogens in erupting third molar sites of periodontally healthy individuals.

29 periodontally healthy subjects (11 female and 18 male) with a mean age of 24 years (range 19 to 38 years) and with partially erupted lower third molars participated in this study. 18 subjects demonstrated no signs or symptoms of acute inflammation and were without pain (group A). 5 subjects showed redness of the pericoronal tissues and experienced pain upon palpation (group B). 6 subjects suffered from acute pain and exhibited formation of pus (group C). Microbiological samples were taken from the lateral aspect of the pericoronal space using the paperpoint-method. Continuous anaerobic techniques were utilized for microbiological processing. The samples were cultivated on ETSA and on selective media and were studied by darkfield microscopy. Gram-negative anaerobic rods accounted for 27% (group A), 34% (group B) and 39% (group C) of all organisms growing on ETSA. Bacteroides intermedius was detected in 61% (group A), 80% (group B) and 83% (group C) of the samples. B. gingivalis was found in 1 sample of group A only. Fusobacterium sp. was detected in 56% (group A), 80% (group B) and 33% (group C) of the samples. Capnocytophaga were seen in 67% (group A), 20% (group B) and 50% of the samples. Actinobacillus actinomycetemcomitans was found in 44% (group A), 40% (group B) and 17% (group C). 72% of the group A and 100% of the group B and C samples contained spirochetes. In all of those positive samples, small spirochetes were present, but only 78% contained medium and only 48% large spirochetes.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1990

Formation of a periodontal ligament around titanium implants.

The aim of this study was to examine wound healing events around titanium implants in the presence of retained root tips whose periodontium could serve as a source for cells which could participate in the healing process. Hollow cylinder implants with a titanium plasma-sprayed surface were placed in the mandible of monkeys where the apical portions of previously removed teeth were retained. After a healing period of 12 months, free of functional loading, the implants with surrounding tissues were removed and specimens analyzed in undecalcified sections. This report describes histologic findings of six such implants. Microscopic analysis revealed that in regions where implants were close to retained roots, a periodontal ligament had formed around large portions of the implant. Furthermore, there was a distinct layer of cementum on the implant surface and a periodontal ligament with collagen fibers perpendicularly oriented to the implant surface, implanted into the cementum on the implant surface as well as to the opposing bone. This initial observation suggests that it may be possible to achieve an anchorage of certain dental implants with a periodontium simulating that found surrounding the normal tooth. Furthermore, these findings provide the basis for further studies on regeneration of all components of the periodontal attachment apparatus including cementum, periodontal ligament, and bone.

Animals↗
PubMed1990

Titanium implants with a true periodontal ligament: an alternative to osseointegrated implants?

The purpose of the present study was to experimentally determine if cementum formation with inserting collagen fibers can be accomplished on dental implants. Titanium implants were placed in the mandible of monkeys, where apical root portions were retained. The histologic examination of undecalcified sections revealed that a cementum layer on the implant surface with inserting collagen fibers was achieved around implants placed in close relationship to retained roots; however, implants without contact to retained roots demonstrated the typical findings of osseointegration. These results demonstrate that dental implants with a true periodontal ligament can be accomplished.

Animals↗
PubMed1990

The treatment of partially edentulous patients with ITI hollow-screw implants: presurgical evaluation and surgical procedures.

The ITI hollow-screw implant is part of the new ITI Bonefit concept, which is based on more than 10 years of clinical experience with former ITI implants. Among other properties, ITI implants are characterized by a one-stage surgical procedure. This article describes the presurgical evaluation and surgical procedures for the treatment of partially edentulous patients with ITI hollow-screw implants. Of 111 implants placed, 110 revealed a complication-free tissue integration and one failed. These results demonstrate that one-stage ITI hollow-screw implants have a high predictability for successful tissue integration.

Adult↗
PubMed1990

Bone regeneration adjacent to titanium dental implants using guided tissue regeneration: a report of two cases.

The biologic principle of guided tissue regeneration was applied to regenerate alveolar bone in conjunction with the placement of titanium dental implants. In one case, complete osseointegration of an implant was achieved by the placement of a Teflon membrane over an implant that had been inserted into an alveolus immediately following tooth extraction. In a second case, the same biologic principle was used to increase the volume (height and width) of a resorbed, edentulous alveolar ridge to provide adequate bone dimensions for implant installation. In both cases, the membranes appear to have prevented the repopulation of the wound area by cells other than those derived from surrounding bone tissue. These two different applications of the principle of guided tissue regeneration open new avenues for reconstructive osseous surgery.

Adult↗