Sectioning and indexing removable partial denture frameworks

Sectioning and indexing removable partial denture frameworks

TIPS FROM OlJR READER5 Sectioning Philip and indexing J. Render, U.S. Army removable partial denture frameworks D.M.D.* Dental Clinic, Nur...

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TIPS FROM

OlJR READER5

Sectioning Philip

and indexing

J. Render,

U.S. Army

removable

partial

denture

frameworks

D.M.D.*

Dental Clinic,

Nuremberg,

West Germany

Removable partial denture frameworks may require sectioning and soldering for an optimal fit. However, framework sectioning mu:rt be used prudently or chair time and accuracy of the final result will suffer. This procedure should be limited to complex castings that fit well after adjustment with the exception of one rest or clasp assembly. The difficulty with the framework sectioning procedure is maintaining i.he sectioned segments in proper alignment while applying the indexing medium. The following technique eliminates this problem. PROCEDURE 1. Section the casting through the pontic. Because this is a low-stress are,a, acrylic resin will eventually hide most of the joint, the retentive beads of both segments will be used in the indexing, and the large surface area will produce an easily formed, strong joint. 2. Place the segments on the master cast and apply a bead of rope wax (Utility wax strips, Hygenic Corp., Akron, Ohio) to them to maintain alignment (Fig. 1). 3. Place the framework in the mouth and completely seat all rests (Fig. 2). 4. Paint self-curing acrylic resin (Duralay, Reliance Dental Mfg. Co., Brooklyn, N.Y.) on both segments approximately ~2mm thick to entrap the retentive beads (Fig. 3). 5. When the acrylic resin is rigid, remove the framework from the mouth for investing and soldering. Do not place the framework on the master cast, because it might be the source of the error. 6. Make a new master impression of the completed framework in the mouth.

Fig. 2. Assembly pletely seated.

Kcj!mnr rN/ucTt\ lo: J. I:ENDER 87 MED DET D S DR.

PHILIP

NUREhlBERc;,

APO

WEST

Fig. 1. Rope wax is added to sectioned framework master cast.

is placed in mouth

on

and rests com-

GERM.IN’I

NY 09105

The opinions herein expressed are those of the author and do not necessarily reflect positionr of the U.S. Arm!! ‘Clinic

Pro~thodcntist.

Fig. 3. Self-curing beads.

THE JOURNAZ,

OF PROSTHETIC

DENTISTRY

resin

is painted

into

retentive

309