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PubMed1996

Influence of film thickness on joint bend strength of a ceramic/resin composite joint.

OBJECTIVES: The purpose of this study was to evaluate the influence of different film thicknesses of resin composite luting agents on the joint bend strength of a ceramic/resin interface. METHODS: Mirage FLC (Chamelon Dental Products) and Vita Cerec (Coltène AG) duo cement were used in combination with the ceramic materials, Mirage and Vita Cerec blocks. Cement layers with thicknesses of 20 microns, 50 microns, 100 microns and 200 microns were light-cured with a high-intensity curing light. Ten specimens of each ceramic/cement combination and thickness provided a total of 80 complete test specimens. Each specimen was placed in a four-point bending jig mounted in a universal tensile testing machine and underwent loading. A paired two-tailed Student's 1-test was used to evaluate differences between different series of film thicknesses and resin cement combinations. RESULTS: Within each ceramic/cement combination, the bond strength values were significantly lower for the 20 micron film then the thicker films. SIGNIFICANCE: Taking into account the physical and clinical properties of resin-based luting agents, available knowledge indicates that a marginal gap on the order of 50-100 microns seems to optimize performance.

Cementation↗

PubMed1993

A microcomputer system for physiological data collection and analysis.

The ability to monitor and record activity within the masticatory system is of importance to both general practitioner and research worker. Recent developments in physiological data collection and analysis at the Department of Anatomy, University of Queensland, have achieved that objective in a simple and cost-effective manner. Recording, printing, plotting, and a wide range of analysis procedures can be undertaken utilizing relatively inexpensive available computers.

Diagnosis, Computer-Assisted↗

PubMed1991

Clinical evaluation of restoration margins by an endoscopic microscope.

A method is presented for high magnification, clinical examination and recording of the marginal fit of dental restorations. An endoscopic microscope used in conjunction with video recording facilities affords acceptable colour records of restorative procedures for monitoring purposes. The suggestion is made that the concept of 'fit' in the clinical context has not been adequately addressed. The technique described has other clinical and research implications.

Cementation↗