A technique for removing metal housing from acrylic resin Yung-tsung Hsu, DDS, MSa and Jinn-Jye Yang, DDSb School of Dentistry, University of Alabama at Birmingham, Birmingham, Ala Many dental attachments use a metal housing for the retentive insert that engages the patrix or matrix on a tooth or an implant. A metal housing with the retentive insert can be incorporated into a denture directly intraorally or indirectly from the stone cast.1-5 The technique of choice depends on the attachment design, tissue resiliency, and preference of the clinician; however, the placement may not be accurate, in which case the metal housing has to be removed and the procedure repeated. The metal housing is usually thin and may be distorted or damaged during the removal procedure. This report presents a technique for removing the metal housing from the denture intaglio surface without damage.

1 Electric soldering instrument on metal component.

PROCEDURE 1. Remove the retentive insert from the metal housing. 2. Heat the metal housing with an electric soldering instrument (Soldering Iron; Chicago Electric) (Fig. 1). 3. Remove the metal housing from the acrylic resin with cotton pliers when the housing becomes loose (Fig. 2). 4. Allow the metal housing to cool to room temperature. 5. Place the retentive insert into the metal housing. 6. Place the metal housing with retentive insert over the patrix or matrix.


2 Removed metal housing and original location on denture base. 7. Relieve the acrylic resin with an acrylic bur (H77E; Brasseler USA) to ensure that the metal housing and the denture do not touch.

8. Repeat the placement procedure according to the manufacturer’s recommendations.

Associate Professor, Department of Restorative Sciences, School of Dentistry, University of Alabama at Birmingham. Private practice, Taipei, Taiwan.


(J Prosthet Dent 2014;-:---)

Hsu and Yang


Volume REFERENCES 1. Nissan J, Oz-Ari B, Gross O, Ghelfan O, Chaushu G. Long-term prosthetic aftercare of direct vs. indirect attachment incorporation techniques to mandibular implantsupported overdenture. Clin Oral Implants Res 2011;22:627-30. 2. Hsu YT. Use of light-polymerized composite resin to stabilize the ball attachment during transfer procedures. J Prosthet Dent 2005;94: 470-1.

3. Dominici JT, Kinderknecht KE, Patella-Clark E. Clinical procedure for stabilizing and connecting O-ring attachments to a mandibular implant overdenture. J Prosthet Dent 1996;76:330-3. 4. Taddei C, Metz M, Waltman E, Etienne O. Direct procedure for connecting a mandibular implant-retained overdenture with ball attachments. J Prosthet Dent 2004;92:403-4. 5. Keys LG, Alarcon K. Simplified technique for blocking out undercuts during direct overdenture matrix attachment. J Prosthet Dent 2002;88:111.

The Journal of Prosthetic Dentistry




Corresponding author: Dr Yung-tsung Hsu Department of Restorative Sciences School of Dentistry University of Alabama at Birmingham 1919 7th Ave S, Room 534 Birmingham, AL 35294 E-mail: [email protected] Copyright ª 2014 by the Editorial Council for The Journal of Prosthetic Dentistry.

Hsu and Yang

A technique for removing metal housing from acrylic resin.

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