Protective cover cap for implant attachment

ant attachment Tim&y David

R. Saunders, Grant

A procedure prosthesis distortion

U.S.A.F.

Medical

DDS,a and Narmcy A. Oliver, Center,

Travis

Air

Force

Base,

is described for use of a cast metal cover attachments during finishing and polishing. or damage to the implant. (J PROSTHET DENT

F.. mlshmg.

and polishing implant prostheses can be frustrating and ultimately can result in remaking a prosthesis if the abutment cylinder is distorted by overfinishThe views expressed in this article are those of the authors and do not reflect the official policy or position of the Department of Defense or the U.S. Government. *Chairman, Department of Prosthodontics. hNoncommissioned Officer-in-Charge, Base Dental Laboratory. 10/1150207

Fig. 1. Left, Guide pin with gold cylinder in place; center, all threads on guide pin blocked out (Some threads may be left exposed.); Right, wax-up of cover cap.

Fig,

2. Cast protective

cover caps.

CDTb

Calif. cap to protect The cap helps 1993;70:548-9.)

implant prevent

ing or polishing. The following procedure uses a cast metal cover cap to protect the implant attachment.

PROCEDURE 1. Place guide pin in gold cylinder (Fig. 1, left). 2. Block out guide pin threads that protrude through the gold cylinder or leave a few threads exposed through the block-out material. Retention of the protective cover caps can be achieved by friction between cover cap and

Fig. 3. Adjustment ting of gold cylinder.

of protective

cover caps to allow fit-

Fig. 4. Cover cap adapted to gold cylinder ing and polishing procedures.

VOLUME

during

70

finish-

NUMBER

6

SAUNDERS

AND

THE

OLIVER

gold cylinder or by screwing guide pin through gold cylinder cover cap (Fig. 1, center). Make a wax cover cap over the gold cylinder with the guide pin in place. Overwax the marginal junction approximately 0.5 mm (Fig. 1, right). Sprue, invest, and cast the wax cap in conventional manner; precious or nonprecious metal may be used (Fig. 2). Adjust the cast protective cover cap to fit the gold cylinder (Fig. 3). Place a cast metal protective cover cap over a gold cylinder on the prosthesis and proceed with finishing and polishing (Fig. 4).

Bound volumes

JOURNAL

OF PROSTHETIC

DENTISTRY

SUMMARY A procedure has been described that uses a cast metal protective cover cap during finishing and polishing of gold implant attachment cylinders. The use of these protective cover caps has been found to make it easier to maintain marginal integrity between implant attachments and gold cylinders.

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DH. T. R. SAUNDERS DEPAR’L‘MENT OF PROSTHODONTICS DAVIU GRANT USAF MEDICAL CENTER TRAVIS AFB, CA 94535-1800

to subscribers

Bound volumes of THE JOURNAL OF PROSTHETIC DENTISTRY are available to subscribers (only) for the 1993 issues from the publisher at a cost of $60.50 ($73.50 international) for Vol. 69 (January-June) and Vol. 70 (July-December). Shipping charges are included. Each bound volume contains a subject and author index, and all advertising is removed. Copies are shipped within 30 days after publication of the last issue in the volume. The binding is durable buckram with the journal name, volume number, and year stamped in gold on the spine. Volumes 67 and 68 are also available. Payment must accompany all orders. Contact Mosby, Subscription Services, 11830 Westline Industrial Drive, St. Louis, MO 63146-3318, USA; phone (800) 325-4177, ext. 4351, or (314)453-4351.

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DECEMBER

1993

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549