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Biomedical subjects

L A Linde

Publications and source records attributed to L A Linde.

11 recordsLinked to original sources
PubMed1993

The use of composite resins in combination with anchorage posts as core material in endodontically treated teeth: clinical aspects of the technique.

In vitro tests and a clinical examination of 51 patients who were treated over a period of 12 years have demonstrated that a composite resin core that is surrounded by a gold crown may provide the same function and strength as a conventional gold core. However, the method demands a thorough knowledge of the materials and a careful and detailed technique. The importance of an initially effective dentinal bond to the chosen hybrid composite resin is stressed. Zinc phosphate cements and the technique of cementing are also discussed. In most cases, a damaged root will have to be reinforced with a post, and the author recommends the use of a threaded titanium post that fits well and is bound to the root with a so-called passive cementation technique. The author has also had positive experiences with composite resin crowns, which can be expected to have a functional life of at least 10 years.

Cementation↗
PubMed1984

The use of composites as core material in root-filled teeth. II. Clinical investigation.

49 patients who during a period of 10 years have been provided with gold crowns and composite cores, both as separate crowns and in bridges, have been followed up. The composite cores have been reinforced and retained in their roots, almost in every case by screw-posts. The basis for evaluation has been radiographs taken before the commencement of treatment and at the follow-up 2-10 years later together with clinical examination of the restorations. The aim has been to determine whether the restorations continue to function satisfactorily or if failures have occurred. Of the 51 teeth which were available for reexamination 43 were found to be functioning satisfactorily at the follow-up. In one case only the gold crown had loosened from its core. In the remaining seven unsuccessful cases the cement retention between the crowns and cores were intact and the teeth had been lost because of root fracture, secondary caries and/or inadequate post retention.

Adult↗
PubMed1983

The use of composites as core material in root-filled teeth. I. In vitro study.

To study how repeated temperature variations, "thermal stress", will influence the cement retention between composite materials--formed as cores--and gold crowns, extracted permanent teeth were prepared to core form. Stylized gold crowns were waxed up on the dentine preparations and cast, four for each of three chosen preparations, which in their turn were used to form cores in gold and three different composite materials. The attempt was to achieve four as similar test-pieces as possible for each core shape. Two new cements and four zinc phosphate cements were used as retaining medium for 48 test series. Four similar test-pieces have each time been subject to thermo-cycling during 12 hours in a specially designed apparatus. The temperature intervals were 0 degree C, 25 degrees C and 50 degrees C. Each series has then been loaded into a tensiometer and stressed until the cement retention was overcome. The test results showed that microfill composite cores were associated with least retention values. For the other materials: gold and macrofill composites (two paste system and single paste system), no differences were to be seen. The retentive ability for one (a zinc phosphate cement, normal- and fast-setting) of five different cements differed remarkably: about double the load was required to loosen the core from its crown than when any of the other cements was used.

Cementation↗