a method for avoiding demarcation lines when processing dentures with a definitive denture base
TRANSCRIPT
A method for avoiding demarcation lines when processing dentureswith a definitive denture base
Michael G. Reeson, BA(Hons), MA,a and Norman R. Hunterb
School of Dental Technology and Prosthodontic Laboratory, The Dental Hospital,Newcastle Upon Tyne, United Kingdom
When processing dentures with a definitive denturebase, the traditional procedure is to flask the denturein the conventional manner1 and pack acrylic resin onthe definitive denture base. However, the new acrylicresin does not always bond to the definitive denturebase following the second processing. This results invisible demarcation lines between the definitive denturebase and the resin of the second process. This problemcan be avoided by carefully removing the definitive den-ture base from the cast in the flask, prior to trial closure.The polished denture surface is then lightly airborne-particle abraded before returning the base back to itscast, prior to packing with the new acrylic resin.
PROCEDURE
1. Flask the denture in the conventional manner.1
2. Carefully remove the definitive denture base from itscast in the flask.
3. Using an airborne-particle-abrasion unit (GuysonBlast Cleaner; Guyson Intl Ltd, Yorkshire, UK),lightly airborne-particle abrade the polished surfaceof the denture base (Fig. 1) at 100 psi for 10 secondswith grade 60/80 coarse particles (2/Blast Grain;Chaperlain & Jacobs, Surrey, UK).
4. Return the definitive denture base to the cast readyfor trial flask closure.
5. Prior to packing and trial flask closure, paint a mini-mal amount of monomer (Heraeus Kulzer Ltd,Newbury, UK) on the airborne-particle-abradedpolished surface of the denture base.
REFERENCE
1. Bates JF, Huggett R, Stafford GD. Removable denture construction. Surrey
(UK): Butterworth-Heinemann; 1991. p. 104-7.
aInstructor, Dental Technology.bSenior Chief Technician, Department of Prosthodontics.J Prosthet Dent 2006;96:219.
SEPTEMBER 2006
Reprint requests to:
MR MICHAEL G. REESON
SCHOOL OF DENTAL TECHNOLOGY
THE DENTAL HOSPITAL
RICHARDSON RD
NEWCASTLE UPON TYNE
NE2 4AZ
UK
FAX: 44-191-282-4671
E-MAIL: [email protected]
0022-3913/$32.00
Copyright � 2006 by The Editorial Council of The Journal of Prosthetic
Dentistry.
doi:10.1016/j.prosdent.2006.08.008
Fig. 1. Close view of the non–airborne-particle-abraded(right) and airborne-particle-abraded (left) surfaces.
THE JOURNAL OF PROSTHETIC DENTISTRY 219