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Biomedical subjects

R Mericske-Stern

Publications and source records attributed to R Mericske-Stern.

12 recordsLinked to original sources
PubMed1992

Three-dimensional force measurements on mandibular implants supporting overdentures.

The purpose of this study was to determine masticatory and functional forces in three axes on mandibular implants supporting overdentures. Five edentulous test subjects were selected, each having two mandibular implants. Three-dimensional piezoelectric force transducers were mounted on the two-part ITI Bonefit implants and rigidly connected to the denture. Forces in vertical, lateromedial, and anteroposterior directions were measured by means of electrostatic plotter records. The test modalities were light tapping, grinding, maximal occlusal force, and chewing test food. Results showed that the five subjects developed similar stress patterns but quantitatively different occlusal and chewing forces. In all but one subject, reduced maximal occlusal force was found compared to dentate subjects and edentulous subjects with fixed partial prostheses supported by implants. The recordings of chewing cycles when eating test food resulted in very regular rhythmic strokes, similar to those of dentate subjects but with slightly reduced speed. All stress patterns showed that occlusal and chewing forces were mainly directed in vertical, medial, and anterior dimensions. The dominating component was vertical.

Aged↗
PubMed1990

Microbiological features of stable osseointegrated implants used as abutments for overdentures.

The microflora associated with osseointegrated implants used as abutments for overdentures was investigated in 18 edentulous patients, 2 years after implantation. 52.8% of the organisms cultured were facultatively anaerobic cocci and 17.4% were facultatively anaerobic rods, while Gram-negative anaerobic rods accounted for only 7.3%. Fusobacterium sp. and Bacteroides intermedius were both found in 8.8% of the samples. B. gingivalis and spirochetes were not found. Repeated microbiological and clinical data were collected in 9 patients during the 3rd, 4th and 5th year after implantation. No significant time trends were noted. Separate samples taken within the same patient from different sites were similar. Therefore, bacteriological independence of sites could not be assumed for the conditions investigated.

Dental Abutments↗
PubMed1990

Clinical evaluation of overdenture restorations supported by osseointegrated titanium implants: a retrospective study.

This paper reports the results of using osseointegrated titanium implants as abutments for overdenture restorations in the mandibles of 62 edentulous patients. All of these patients were edentulous for several years and required complete dentures. Six months after prosthodontic treatment, two implants (ITI, Straumann) were placed with consideration of the denture base and morphologic aspects of the mandibular residual ridge. The retention devices consisted of a bar connector or single ball-shaped precision attachments. Three or four implants splinted with a bar were placed in a control group of 11 patients. Attached keratinized gingiva (greater than or equal to 2 mm) surrounded approximately 48% of the buccal and 55% of the lingual implant sites. Evaluation after periods of 6 to 66 months postoperatively revealed good clinical results with five patients lost to recall in 1989. Two implants were lost after overdenture insertion. The findings suggest that two implants may adequately serve as retention for a mandibular complete denture and that attached gingiva surrounding the implants does not seem to be prerequisite for healthy function.

Adult↗
PubMed1990

[The aftercare findings and recall behavior of older patients with removable dentures].

Data were collected from 285 patients (average: 63.8, range: 23 to 87) who received prosthodontic treatment at the Clinic for Removable Prosthodontics of the University of Bern during the years of 1981 through 1987. 62 edentulous patients received two osseointegrated implants in the lower jaw. For the partially edentulous patients, removable partial dentures (RPD-89 patients) or overdentures (OD-134 patients) were prescribed. These two groups received recall care for a period of 2 to 3 years after insertion of the dentures. Due to limited capacity of the university clinics, a great part of these patients were then referred to private practitioners. All patients from the student course, however, were carefully checked during the year after insertion of the denture. Implant patients received a regular recall throughout the observation time. The patients' behaviour was not up to the dentists' expectations: less than 50% of the RPD and OD patients followed the recall appointment regularly. In contrast, the implant patients participated 100% in the recall. The plaque and bleeding indexes were much higher in the partially edentulous than in the implant patients. RPD and OD patients with regular recalls scored significantly better, but never reached the same level of results as the implant patients. Nevertheless, the probing depths on implants were a bit higher compared to those of the natural teeth, but not significantly.

Adult↗
PubMed1989

[The elderly patient in private practice].

The aim of this study was to get an overview on therapeutic measures and recall compliance of elderly patients treated in a private dental office. Data regarding the dental treatment und prosthodontic rehabilitation were collected from a total of 429 patients who were 65 years old and older (average: 75.8 years). 94 patients (23%) were edentulous and had dentures in both jaws, whereas 335 patients still had remaining teeth in one or both jaws. Only 8 patients had a full complement of teeth. 239 patients (55%) had complete oral rehabilitation. Few fixed partial prostheses and mainly removable partial und complete dentures were inserted. 190 patients did not get new reconstructions, because 1) they did not need it, or 2) they did not want it. In some cases, existing prostheses could be adapted or repaired. Almost all patients with remaining teeth were in need of periodontal treatment. 54% of them underwent periodontal therapy. Maintenance care was supported by regular recall. 65% of the patients appeared regularly according to their individual interval. A strong correlation could be established between regular recalls, the extent of rehabilitation and the number of remaining teeth.

Aged↗
PubMed1989

[Osseous integration].

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Dental Implantation, Endosseous↗