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At least 955 records · Page 53Linked to original sources
PubMed1979

Bone maintenance: implant versus transplant.

Bone maintenance based on various attachment mechanisms is the key to tooth-root replacement safety and efficacy. The dental implant has broad applicability based on design, but demonstrates progressive peri-implant bone loss. The allogeneic tooth transplant, significantly less applicable because of size, is antigenic and rejected by bone-replacement root resorption. Since the predictability and survival times of these implant and transplant modalities are similar and there is less residual bone loss with the transplant, it is suggested that for clinical situations such as the fresh extraction socket, where there is room, the allotransplant, rather than implant, is the root-replacement of choice.

Alveolar Process↗
PubMed1979

Porous polysulfone as an attachment vehicle for orthopedic and dental implants.

The mechanical properties of porous polysulfone (PSF) were determined and its performance as a surface coating on orthopedic and dental implants evaluated. Ten coated femoral prostheses were implanted in nine dogs. A second series of four uncoated "control" prostheses and all of the acetabular cups were implanted using conventional bone cement techniques. Six porous PSF coated tooth roots were implanted in healed mandibular premolar extraction sites in three Rhesus monkeys. The shear strength of porous PSF (6 MPa) was comparable to that of trabecular bone. Pushout tests of 1cm. thick sections of the prostheses yielded interfacial shear strength values over 1.4 MPa for the PSF coated hips after 14 weeks and mean values under 0.7 MPa for the bone cemented specimens after 3 and 36 weeks. Bone and fibrous tissue was identified in the pores of coated specimens. Preliminary clinical evaluation of the functioning dental implants revealed zero mobility and other favorable clinical and radiographic indications after 2 months.

Alveolar Process↗
PubMed1979

Stress analysis of single-tooth implants. I. Effect of elastic parameters and geometry of implant.

Five different implant materials and three different geometries of ankylosed single-tooth implants were investigated. The stress distributions within and around the implants were determined by finite element analysis. Results show that the optimal combination of implant material and geometry can reduce implant and alveolar stresses by a factor of three when compared to an arbitrary implant design.

Alveolar Process↗
PubMed2006

Effect of mica and glass on acrylic teeth material's color.

The purpose of this study was to evaluate the effect of two different ratios of silanized mica filler and milled glass fiber reinforcement on the color of acrylic denture teeth materials. Ten acrylic resin discs made of acrylic denture teeth material (PMMA) obtained from the manufacturer were used as the control group. Four experimental groups were modified from the control group's PMMA material by adding a ratio of 5% or 10% by weight of silane-treated mica filler or milled glass fibers. Each group consisted of 10 specimens. Measurements were performed using a spectrophotometer CM-2600d, and the color changes were characterized in the Commission Internationale d'Eclairage L*a*b* color space. deltaE* values of 5% mica-, 10% mica-, 5% glass-, and 10% glass-containing sample groups were 2.46, 3.03, 2.16, and 2.59 respectively. There were statistically significant differences in L*, a*, and b* values between the control group and each test group. It was shown that when PMMA denture teeth material was modified with silane-treated mica filler or silane-treated milled glass fibers for the purpose of reinforcement, it would also cause significant changes to the original color of the material.

Acrylic Resins↗
PubMed1998

Preimpregnated, fiber-reinforced prostheses. Part II. Direct applications: splints and fixed partial dentures.

This article is the second in a series that describes the development, physical properties, and clinical applications of fiber-reinforced composite materials. The development of fiber-reinforced composite technology has opened new avenues for fabricating direct tooth replacements and splints that are esthetic and simple in design and execution and have the potential for excellent durability. Splinting techniques for hypermobile dentitions or postorthodontic retention and the replacement of anterior and posterior teeth using a groove preparation, a denture tooth, and a fiber-reinforced composite framework will be described.

Composite Resins↗
PubMedDate not supplied

Strength and mode of failure of single implant all-ceramic abutment restorations under static load.

The strength and mode of failure of three different designs of custom-made all-ceramic implant abutments fabricated by milling of In-Ceram sintered ceramic blocks were compared with the conventional CeraOne system under static load. Four test groups were formed with different locations of abutment screws. In three test groups, In-Ceram crowns were fabricated for placement on the all-ceramic abutments, and in one test group, a veneer porcelain was fired directly on the abutment; crowns in the control group were fabricated using the CeraOne system. Ten-mm-long Brånemark implants were placed into a brass block that allowed loading at a 30-degree angle to the long axis. The test group in which the veneer porcelain was fired directly on the all-ceramic abutments was the weakest, and it showed fractures at a mean value of 236 N. The fracture strength of the three other test groups was dependent on the extension of the crown margin relative to the location of the screw head. The test group that had the screw on the top compressing the entire ceramic abutment showed a mean value of 422 N that was similar to the results that were achieved with the CeraOne system (427 N). The weakest link in the all-ceramic single implant restorations was the abutment screw in which the bending began at approximately 190 N.

Aluminum Oxide↗
PubMedDate not supplied

Techniques of past served well by new prosthodontic technology, materials.

During the past 15 years, advances in laboratory technology, prosthetic teeth, and materials have provided the practicing clinical dentist with many new options for the treatment of the removable prosthodontic patient. Some of these advances which allow improved quality of care for the patient as well as increased convenience for the dentist and technician will be presented. Additionally, some of the research available on these products will be discussed in an attempt to aid the practitioner in exploring the option of incorporating these advances into their clinical practice.

Acrylic Resins↗