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Biomedical subjects

B P Isenberg

Publications and source records attributed to B P Isenberg.

14 recordsLinked to original sources
PubMed1994

Effect of gap dimension on composite resin cement wear.

For composite resin and ceramic inlays there is little information about the survival of the luting agent. The purpose of this in vitro study was to relate the wear rate of the composite resin luting agent to interfacial gap dimensions and filler particle size. By controlling the gap dimension between the inlay and cavity preparation through use of the cement and horizontal gap width. It was confirmed that this relationship was linear. In addition, the inclination of the regression line was assumed to indicate the extent of wear. Therefore, the wear resistance of cements could be determined by determining this inclination. The results of this study revealed that two hybrid cements exhibited lower wear resistance than did a microfilled cement.

Ceramics↗
PubMed1993

Evaluating CAD-CAM generated ceramic veneers.

As the CAD-CAM technique has been expanded to include porcelain facings, of particular interest is adapting the veneer to the prepared surface. In a comparison of the gap dimension of CAD-CAM generated veneers to those produced in the laboratory, no statistically significant differences were detected.

Analysis of Variance↗
PubMed1993

CAD-CAM comments.

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Computer-Aided Design↗
PubMed1989

A new method for generating ceramic restorations: a CAD-CAM system.

The CAD-CAM CEREC system is a small, complex unit developed for electronically designing and milling ceramic restorations. The system makes it possible to generate a restoration without taking impressions, developing temporary prostheses, and without laboratory assistance. The entire restorative procedure is performed in one appointment. Basic features include the following: the cavity preparation is scanned stereo-photogrammetrically, using a three-dimensional miniature video camera; the small microprocessor unit stores the three-dimensional pattern depicted on the screen; the video display serves as a format for the necessary manual construction via an electrical signal; the microprocessor develops the final three-dimensional restoration from the two-dimensional construction; the processing unit automatically deletes data beyond the margins of the preparation; the electronic information is transferred numerically to the miniature three-axis milling device; driven by a water turbine unit, the milling device generates a precision-fitting restoration from a standard ceramic block; the entire process of electronic designing and subsequent milling of a ceramic restoration requires approximately 10 to 15 minutes.

Computer Simulation↗
PubMed1989

Clinical evaluation of a posterior composite resin containing a semiporous filler particle.

Bowen recently developed a new filler particle for composite resin restorations. The surface particles of a diphasic strontium glass are superficially etched and after silanating the surface, the microscopic defects are filled with prepolymerized resin. The filler particles are then bonded chemically and mechanically to the resin matrix. This paper discusses the clinical performance of this material as a posterior composite resin over a two year period.

Bicuspid↗
PubMed1988

Comparison of personality variables and values among dental students, practitioners, and faculty.

Changes in personality and values in four classes of dental students at the University of Alabama School of Dentistry were reported in a previous paper. The purposes of this study were to determine the permanency of these changes after graduation and to compare the personalities and values of students and graduates to those of the faculty. Data were collected using the Myers-Briggs type indicator and the All-port-Vernon-Lindzey study of values. Analysis of variance was used to determine differences among the three groups. Graduates tended to resemble themselves as students. On nine of the ten variables, the faculty clustered differently from the students, the graduates, or both groups, raising the issue of the extent to which faculty members serve as role models.

Dentists↗
PubMed1985

Analysis of personality traits of the contemporary dental student.

The Allport-Vernon-Lindzey Study of Values (AVL) and the Myers-Briggs Type Inventory (MBTI) were administered to four classes of students upon their matriculation into dental school and readministered during each year until graduation. Over the four years, scores on the economic and political scales of the AVL increased significantly but decreased significantly on the social scale. Female students were more aesthetic than males and less politically inclined. On the MBTI, scores remained relatively stable over the entire four years. However, females were significantly more intuitive and more feeling than males. In general, this sample of dental students, who graduated in 1979, 1980, 1981, and 1982, was quite similar in personality to samples of dental students of the early 1960s.

Attitude↗
PubMed1981

Dental amalgams.

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Dental Amalgam↗
PubMedDate not supplied

Displacements of precious and nonprecious dental bridges utilizing endosseous implants as distal abutments.

An investigation was conducted to establish qualitative trends regarding to relative displacements exhibited by the distal and mesial abutments in a five-unit fixed dental bridge as a function of bridge material and implant design utilized in the distal abutment site. Both Au and Ni-based bridge systems utilizing double, natural-tooth mesial abutments and three types of distal abutments (natural second molar, blade dental implant, and hollow-basket implant) were tested on a dried human mandible and subjected to a controlled force applied distally. Dial gauges were positioned around each abutment site bilaterally to provide displacement data in the x(mesial/distal), y(buccal/lingual, and z(occlusal/gingival) directions. The results indicate some significant differences exist in the displacement profiles exhibited by the bridge systems as a function of both bridge material and abutment type.

Chromium Alloys↗
PubMedDate not supplied

Efficacy of beveling posterior composite resin preparations.

A clinical study was conducted to evaluate the controversy over the need to bevel the occlusal cavosurface margins of posterior composite resin preparations. A total of 43 standard amalgam type cavity preparations were generated. On a randomized basis the preparations were either beveled or left unmodified. The width of the bevel in each case approximated 1 micron. Impressions were made of each preparation to verify occlusal dimension. Each preparation was restored with Estilux Posterior (Kulzer, Inc.) using conventional techniques. Polyvinyl siloxane impressions were generated and then cast with die stone. These casts were evaluated for wear at baseline, 6 months, 1, and 2 years. The loss of composite resin in the beveled preparation at 2 years averaged 81.2 microns while the nonbeveled averaged 69.8 microns. On the basis of this study, it was concluded that beveling of the occlusal cavosurface did not enhance the wear resistance of the composite resin restoration nor any of the other clinical characteristics evaluated in the study.

Adult↗
PubMedDate not supplied

Three-year clinical evaluation of CAD/CAM restorations.

This study dealt with the clinical evaluation of 121 inlays and onlays generated from both Dicor ceramics and Vita porcelains. These two different types of ceramic materials were cemented using three different duo-cured composite resin luting agents, which differed in particle size. At the end of 3 years, no difference could be detected between the clinical performance of the Dicor and Vita restorations. Both exhibited the same degree of color matching characteristics, marginal integrity, and general clinical performance; however, seven of the restorations exhibited fracture through the isthmus, which was shown to be due to insufficient cavity depth. The balance of the restorations exhibited excellent clinical performance when evaluated against the United States Public Health Service System.

Aluminum Oxide↗