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Biomedical subjects

J D Eick

Publications and source records attributed to J D Eick.

At least 91 records · Page 5Linked to original sources
PubMed1986

Movement of three removable partial denture clasp assemblies under occlusal loading.

This investigation indicates that the design of the clasp assembly affects the magnitude of movement of the abutment tooth adjacent to an extension base but generally does not affect the direction of movement. Some clasp assemblies (distal rest) moved more than other clasp assemblies (wrought wire or I-bar), and hence, the abutment tooth moved more. The design of the clasp assembly did not seem to affect the magnitude of movement in the apical direction.

Bite Force↗
PubMed1986

Effect of positional loading of three removable partial denture clasp assemblies on movement of abutment teeth.

Tests demonstrated that the degree of movement of the abutment tooth for a distal-extension base using three different clasp designs was a function of the location of loading. Thus, the null hypothesis, there is no significant difference in the degree of movement of the abutment tooth around the axis of rotation as a function of the position of loading, has been demonstrated to be invalid based on the data obtained in this investigation.

Bite Force↗
PubMed1983

Root surface measurements of mandibular molars using stereophotogrammetry.

Ten mandibular first molars were hemisected and the root surface of each root was measured using stereophotogrammetry and computer analysis. In each tooth the mesial root was determined to have a greater surface area than the distal root. This difference was statistically significant. The fact that the mesial root has the larger surface area must be a consideration when hemisection is planned.

Humans↗
PubMed1981

A critical evaluation of the acute systemic toxicity test for dental alloys using histopathologic criteria.

The A.D.A. acute systemic test for type II, class 11 materials defines compliance on the basis of fewer than 50% mortality at 2 weeks. Histopathologic criteria were developed from pilot study data to evaluate the effects of these materials. In this double blind study, the frequency of histopathological changes in lung, liver, small intestine, and kidney were rated at 2 and 5 weeks, for six dental crown and bridge alloys ranging from 44% to 97% (Au, Pt, and Pd). Two positive 360 mg/kg and 1 g/kg of cadmium and two negative, a blank capsule and untreated control groups were used. There was significant difference (chi square test, X2 = 0.95) between the positive and negative controls at 2 and 5 weeks. The lung, liver, kidney showed the highest level of histopathological changes. Significant changes occurred in the four tissues for all alloys at two and five weeks. At five weeks, alloys with a lower noble metal content (44-62%, Au, Pd, and Pt) elicited significant chronic changes, while higher noble metal content (78-97%) showed healing and no significant difference from the negative controls. Applying histopathologic criteria and statistical parameters independent examiners can examine experimental animals and arrive at conclusive and reproducible results.

Animals↗
PubMed1981

Microtopography and clinical adhesiveness of an acid etched tooth surface. An in-vivo study.

The clinical adhesiveness as expressed by the critical surface tension and roughness of an acid etched tooth surface was studied as a function of time; from time of acid "conditioning" and at selected time intervals up to seven days. The critical surface tensions of the tooth surface were calculated from clinical contact angle measurements as were values for change in roughness. SEM micrographs of the surfaces were obtained for visual comparisons. The results indicate that the surface of the tooth returns to its original state of adhesiveness and roughness in a relatively short period of time as a consequence of the adsorption of a biofilm, the acquired pellicle.

Acid Etching, Dental↗
PubMed1979

Importance of design, control, & quantitative data in dental clinical research.

The ultimate test of a restorative dental biomaterial is its performance in vivo. Often laboratory test data does not correlate directly with clinical performance, so clinical research with human patients is essential. Clinical research that obtains maximum information from a minimum number of patients must be well designed and controlled. Pilot studies are necessary to establish experimental conditions and to determine the sample size. Previous clinical studies with various restorative materials have shown that careful screening and comprehensive oral examinations of patients are necessary to insure maximum recall for evaluation. Controlled placement procedures and randomized alloy placement are extremely important. Restorations are evaluated both by the response of patients to the restorations and by trained and calibrated dental examiners using established ranking criteria. Quantitative data measured in vivo such as that obtained from stereophotogrammetry reduced the need for large patient populations. The interfacing of a computer to record patient, placement, and evaluation data assisted greatly in project management.

Biocompatible Materials↗
PubMed1977

Biological properties of denture base resins.

The biocompatibility and clinical efficacy of dental materials have been and continue to be a major concern of the dental profession. There are some cases of dental materials that have demonstrated problems with biocompatibility, for example, silicone soft liners. Although rare, allergic stomatitis caused by denture base resin is another example. High purity, very large polymer size, and nonoccurrence in nature significantly contribute to the acceptance of polymers used as biomaterials. New Federal Food and Drug Administration law and requirements of the specification and testing program of the American Dental Association will control the biocompatibility and clinical efficacy of dental biomaterials presently available to the dental profession.

American Dental Association↗