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Biomedical subjects

R Beals

Publications and source records attributed to R Beals.

4 recordsLinked to original sources

Tatum custom ramus frame implant: multiple options including treatment for combination syndrome.

The advantages offered by the Tatum custom ramus frame include its extended posterior arms, its ability to form a solid interface, and its availability in numerous sizes. It has solved some of the problems associated with the earlier models of the ramus frame. It offers stable support for a removable prosthesis in the completely edentulous mandible. In cases of combination syndrome, where a hopeless anterior dentition must be removed, a ramus frame can be placed immediately into the extraction sites. In a severely atrophied alveolar ridge, bone augmentation can be performed simultaneously with the ramus frame placement surgery. This implant device can, moreover, restore the patient's stomatognathic system to comfort, function, and pleasing esthetics quickly and economically. Furthermore, statistics show a 97% survival rate over 18 years (Tatum, 1992). Although the surgical procedure for the custom ramus frame is more complex than that for root-form and some subperiosteal procedures, and patients must be carefully selected, the custom ramus frame provides improved strength and load resistance.

Adult↗

Spark erosion fixed/detachable prosthesis for the completely edentulous maxilla.

A technique is described for restoration of the completely edentulous maxilla. From six to eight root-form implants are surgically placed in the edentulous maxilla. A hybrid overdenture is constructed by use of a two-degree tapered precision milled primary bar. A cast overdenture prosthesis is constructed over this bar, and precision attachments are spark-erosion-processed to the primary and secondary prosthetic components. The technology described in this article allows for an intimate fit of the various prosthetic components. This prosthetic protocol permits maximum retention and stability of the prosthesis and solves many problems which are encountered in the oral rehabilitation of the edentulous maxilla.

Adult↗

Classes of spatially inhomogeneous pseudodifferential operators.

One can obtain sharp information on a pseudodifferential operator p(x,D) by embedding the symbol p in a symbolic calculus specially designed to reflect the behavior of p. We sketch the development of symbolic calculi arising in this connection, and use our results to give simple proofs of the sharp Gårding inequality and of sufficiency of Nirenberg-Traves' condition (P) for local solvability of equations of principal type.

Journal Article↗