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Biomedical subjects

J W McCartney

Publications and source records attributed to J W McCartney.

At least 19 recordsLinked to original sources
PubMed1997

Stabilization investment template for direct casting connection of implant framework segments.

This article presents a procedure whereby a template made of casting investment is used to stabilize a sectioned implant framework that has been adapted in a passive relationship to the implant analogs in a corrected master cast. The joints in the sectioned framework are filled with wax, sprues attached, and the template and sectioned framework are invested in a casting ring. When the casting procedure is completed, the framework will be reconnected by direct metal casting.

Dental Casting Investment↗
PubMed1994

Segmental framework matrix: master cast verification, corrected cast guide, and analog transfer template for implant-supported prostheses.

A procedure is presented whereby a sectioned acrylic resin framework pattern for an implant-supported prosthesis is used for multiple purposes. It captures the three-dimensional spacial relationship of a dental implant. It acts as an analog transfer template, corrected cast guide, and a rigid scaffolding for the actual sculpting of the framework pattern.

Acrylic Resins↗
PubMed1993

Passive adaptation of the prosthesis-implant interface by soldering gold cylinders to the framework casting.

Difficulties associated with accuracy of conventional long-span one-piece castings for fixed partial dentures are also observed in the fabrication of implant-supported prostheses. A technique is proposed whereby direct intraoral verification of cylinder-abutment relationship, master cast accuracy, possible corrected cast procedures, and soldering of gold cylinders to the framework ensure an accurate, passive adaptation of the prosthesis to all supporting implants.

Dental Abutments↗
PubMed1992

Cantilever rests: an alternative to the unsupported distal cantilever of osseointegrated implant-supported prostheses for the edentulous mandible.

Mandibular prostheses supported by implants placed between the mandibular foramina restrict the length of the distally cantilevered components to minimize torque-related stress to the supporting implants. Additional posterior implants used as abutments with rigid attachments better distribute occlusal forces and reduce cantilever torque to the anterior implants. Because of the phenomenon of mandibular flexure, these posterior implants could be subjected to stress-induced microdamage to the bone-implant interface. The use of posterior abutments for support of the cantilever without connection reduces the potential hazard of stress-induced microdamage.

Bite Force↗
PubMed1991

Osseointegrated implant-supported and magnetically retained ear prosthesis: a clinical report.

Osseointegrated implants were placed in the temporal bone and were used to retain attachments for an ear prosthesis. A screw-retained magnetic alloy casting was used to retain an acrylic resin magnet keeper, to which a silicone ear prosthesis was attached. The keeper provided vertical support for the prosthesis and facilitated orientation for prosthesis insertion. Stability and retention were provided without the use of adhesives.

Ear↗
PubMed1991

Osseointegrated implant location symbol.

Symbolic implant location identification will accurately describe in an abbreviated, concise manner the specific location of reference. Use of the symbol conveniently simplifies record documentation, data tabulation, and professional correspondence.

Communication↗
PubMed1989

The orbital shell: an aid in positioning the ocular component and verifying margin contours for oculofacial prostheses.

The correct location of the orientation (conversational gaze) of the ocular component is vital to esthetically pleasing oculofacial prostheses. This location should be verified before time and energy are spent on sculpturing the oculofacial prosthesis. A technique is described that uses a clear acrylic resin shell as a matrix and Play-doh material as a support medium to position and support the ocular component to verify the orientation. In addition, the thin acrylic resin shell can be used to refine border inaccuracies that may exist clinically.

Acrylic Resins↗