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PubMed1989

Single tooth implants.

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Dental Implantation, Endosseous↗
PubMed1989

ITI-system. Basic and clinical procedures.

Future development in implant prosthodontics should be based on the fundamentals of sound research and reliable clinical implementation. The goals should be to research the safety and efficacy of implants with regard to materials, host receptor site and interfacial zone; to develop acceptable uniform standards of evaluation; and to submit findings to scientific methods of analysis in determining benefit-to-risk factors. This presentation will offer a glimpse at some current developments in basic and clinical research focusing on studies in biocompatibility and host acceptance; the implant-tissue interface; processes in osteogenesis related to vascularization of host sites; and bioengineering studies related to stress analysis and dimensional accuracy of impression systems for implants. The presentation will further describe future directions in research, training and implementation of services through development of an interdisciplinary team. A center is proposed to address the need for combined efforts in clinical++ and basic science research, the broad scope of implant utilization, and the teaching of implant procedures within an academic setting and to our colleagues.

Biocompatible Materials↗
PubMed1989

Comparative bond strengths of plastic teeth to microwave-curing, heat-curing and 4-META containing denture base resins.

Bond strength of hardened plastic teeth or acrylic resin teeth to microwave-curing, conventional heat-curing and 4-META-containing denture base resins were comparatively investigated in this study. Effects of grinding and monomer coating of the tooth ridge lap were also studied. Bond strength of plastic denture teeth to microwave-curing denture base resin was slightly higher than the other two resins. With all denture base resins used, an increased bond strength was obtained with hardened plastic teeth by treatment of tooth ridge lap but not with acrylic resin teeth. However, scattering of the bond strength was reduced by treatment of tooth ridge lap in acrylic resin teeth specimens. With hardened plastic teeth specimens, fracture in the base resin was increased by monomer coating. With acrylic resin teeth specimens, no specific fracture patterns were demonstrated by treatment of tooth ridge lap. Fracture occurred mostly in the acrylic resin teeth. These results suggest that bond strength of both denture teeth to microwave-curing or 4-META-containing denture base resin was increased or solidified by grinding or monomer coating of tooth ridge lap.

Acrylic Resins↗
PubMedDate not supplied

Ceramic shade determination: current technique for a direct approach.

A method for selecting the optimal shade of a ceramic restoration is presented. The shade is determined using a direct approach, facilitating communication with the laboratory. The dentist generates a custom shade tab using unfired dental porcelain powder mixed with an organic binder which has a refractive index that is adjusted to the fired material. Hue, chroma, value, and translucency are verified by direct comparison with the tooth to be replicated. Necessary adjustments are ascertained prior to fabricating the restoration, minimizing postfabrication alterations.

Ceramics↗
PubMed1989

[Development of the dental arch and the palate from a prosthodontic point of view].

The replacement of missing teeth by a fixed restoration in the juvenile dentition presents various problems. One of them is that the growth and development of the entire masticatory organ continues until around the 18th year of age. It was the goal of a longitudinal study to find out when a fixed tooth replacement can be used in an adolescent without impairing the final development of the jaw bones. For this reason the transverse and sagittal dimensions of the dental arches of male adolescents aged 14 to 18 years were measured every year, and the palatal surfaces were measured in the first and last year of the study. The values determined for the dental arches remained constant. The mean values and deviations revealed no significant differences. From a prosthodontic point of view the development of the dental arches and the palate may be considered as concluded.

Adolescent↗