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K M Lehmann

Publications and source records attributed to K M Lehmann.

50 records · Page 3Linked to original sources
PubMed1976

[Studies on the retention capability of push-button attachments].

Of nine pushbutton attachments the force was determined which is necessary for separating the elements from each other, from unused state and in regular intervals up to 44000 times. The initial forces were between 3150 p and 775 p. It appears that forces between 400 and 1000 p should be sufficient for the anchorage of partial dentures. It is suggested that the retentive forces of such retentive elements be standardized. In extracoronal attachments, the use of two abutments soldered together is recommended.

Dental Abutments↗
PubMedDate not supplied

A telescopic crown concept for the restoration of the partially edentulous arch: the Marburg double crown system.

PURPOSE: This article describes the concept of the Marburg double crown system (MDC system) in the treatment of partially edentulous patients. Long-term success is assessed by a review of patient records. MATERIALS AND METHODS: Double crowns with clearance fit are used to retain tooth-, mucosa-, and implant-supported removable partial dentures (RPD). To achieve retention, an additional attachment, the TC-SNAP system, is used. All metal components are fabricated in a single cobalt-chromium-molybdenum alloy; the framework (including outer crowns) is cast in one piece. Because of the framework's rigidity, the RPD can be constructed without major and minor connectors. The denture base adjacent to the abutments is fabricated using a perioprotective design that is similar to fixed partial dentures. One hundred eleven dentures, of which 49 (44%) were fabricated for patients with intraoral defects, were evaluated by reviewing patient records. RESULTS: The mean age of the patients at the time of insertion was 57.5 years (+/- 12.3). The mean number of double crowns per denture was 3.5 +/- 2.1 (range, 1 to 9). The probability that a patient will have lost all abutment teeth 10 years after insertion of the denture is 4%. The probability that a patient will have kept all teeth that abut the denture 5 years after insertion is 87%; 10 years after insertion the probability is 80%. CONCLUSION: The Marburg double crown system is a versatile and successful means of achieving the long-term restoration of the partially edentulous jaw. Insertion and removal of the denture and routine oral hygiene are easy to perform, even for patients with limited manual dexterity. As a full-arch reconstruction, the MDC system enables easy adjustment, modification, and relining with low follow-up costs.

Adolescent↗
PubMedDate not supplied

Clinical longevity of removable partial dentures retained by telescopic crowns: outcome of the double crown with clearance fit.

PURPOSE: It was the aim of this study to investigate the long-term success of a telescopic crown system that can be used for both rigid and resilient support and to evaluate by means of a literature review whether the use of resilient support may be advantageous compared to other double crown systems when the restoration is placed on only a few remaining teeth. MATERIALS AND METHODS: Patient records were used to evaluate 125 dentures (with 460 abutment teeth) based on the Marburg double crown system. The loss of abutment teeth, endodontic treatment, and fracture of the metallic framework were investigated with regard to the different types of denture support. RESULTS: The probability that a patient would have kept all abutment teeth was 84% after 5 years and 66% after 10 years. No significant differences were found for the two groups "resilient support" (< or = three abutment teeth) and "rigid support" (> or = four abutment teeth). For abutment teeth with a double crown with clearance fit, the risk of loss was 4% after 5 years and 15% after 10 years for rigid support, and 10% and 24%, respectively, for resilient support. The risk of endodontic treatment was 7% after 5 years and 9% after 10 years for rigid support, and 3% and 7%, respectively, for resilient support. None of the denture frameworks showed a fracture during the observation period. CONCLUSION: Removable partial dentures retained by double crowns with clearance fit and constructed without major or minor connectors provide good clinical longevity. The survival rates of abutment teeth were comparable to those reported in the literature for other double crown systems. There was no significant increase of the risk of abutment loss when the restoration was placed on three or fewer remaining teeth and the concept of resilient support was applied.

Adolescent↗