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PubMed1980

Biological implications of dental materials.

Testing of the biologic effects of dental materials has lagged far behind the characterization of their mechanical and physical properties. Various biologic-type tests, whether in vitro or in vivo, have often produced conflicting or confusing data. The objective of this article was to bring together the results of various investigations to form guidelines for the safest use of dental materials. Since many interactions between dental materials and living tissue have not been definitively established, a conservative approach was taken. The clinician who heeds the data summarized for the dental materials presented here will have the greatest probability of obtaining a benign chemical response of soft and hard tissues.

Biocompatible Materials↗
PubMedDate not supplied

Elasticity of impression materials: IV. Permanent deformation as a function of time.

The permanent deformation-time relationship under constant load, of 15 elastomer impression materials were studied. All materials showed a greater permanent deformation under constant load than with tensile load, except the polyether material. Silicone and polyether materials exhibited perceptibly less permanent deformation than mercaptan materials ten minutes after mixing.

Dental Impression Materials↗
PubMedDate not supplied

A new material for splinting neonatal limb deformities.

We report the use of Permagum, a silicone rubber dental-impression material, in the management of neonatal limb deformities. A wide range of custom-made splints can be quickly and easily made from Permagum for both the upper and lower limb. The material is not sufficiently rigid for the older, heavier child but is particularly useful in the neurologically impaired child.

Foot Deformities, Congenital↗
PubMed1998

Computer-generated study of the correlation between tooth, face, arch forms, and palatal contour.

STATEMENT OF PROBLEM: Several factors have been suggested as aids for artificial tooth selection. Numerous methods have been devised for the evaluation of reliable esthetic factors in determining artificial tooth form. There is no universally accepted single esthetic factor that can be used reliably to aid artificial tooth selection. PURPOSE: This article describes a new method incorporating a computer program to analyze four esthetic factors: form of the face, arch form, palatal contour, tooth shape, and to determine whether there was correlation between tooth, face, and arch forms and palatal contour. MATERIAL AND METHOD: Impressions were made of the maxillary dentition of 50 dentate undergraduate dental students with irreversible hydrocolloid impression material and casts formed. A standardized photographic procedure was used to record portrait slides of each subject's face and of maxillary dental arches and central incisors made from dental casts. A comprehensive computer program was developed to correlate esthetic factors by superimposition. RESULTS: Superimposing outline form between face, tooth, and arch showed that for tooth to face form nearly half the comparisons were dissimilar and only 22% corresponded. This is the lowest level of correspondence in this group. Highest correspondence (28%) occurred between arch to face form, followed by arch to tooth form (24%). Arch to tooth showed the lowest level of dissimilarity (32%). For correlation among the four factors across the sample group based on a comparison of classifications in each subject, men tended to dominate tapering classes, whereas women dominated square and ovoid classes. CONCLUSION: Correspondence of outline forms through superimposition revealed an insignificant correlation between face, tooth, and arch forms. Although this method applies high technology, it does not improve the accuracy of determining shape and size of teeth in an edentulous patient. The cost and complexity of the method of measurement may also make it impractical for common application.

Adult↗
PubMed2006

Building the edentulous impression--a layering technique using multiple viscosities of impression material.

The purpose of this article is to introduce a novel impression technique. The procedure demonstrates a building, or layering, method of impression making that maintains the integrity between layers of the impression materials of varying viscosities and controls the path of insertion, minimizing the incidence of overextension. To build a detailed impression of the tissue-bearing surfaces, the clinician selects the proper viscosity of impression material based on the diagnosed tissue condition.

Dental Impression Materials↗