Combining final impressions and the centric into one appointment by using an irreversible blockout technique William A. Krantz, DDS,a Eric D. Adrian, DMD,b and John R. Ivanhoe, Fort Gordon, Ga., and Emory University, Atlanta, Ga.
jaw relation hydrocolloid
records
DDSC
This article presents a technique that combines the final impression and centric jaw relationship appointments. It can be used with complete dentures, single dentures, and altered cast impressions. TECHNIQUE 1. Make a custom final impression tray with a wax occlusion rim on the preliminary cast. For a removable partial denture with a distal-extension base, attach the tray and occlusion rim to the framework retentive mesh. Then remove the distal-extension part of the cast. 2. Complete border molding and make final impressions in a conventional manner. Choose a final impression ma-
The opinions or assertions contained herein are the private ones of the authors and are not to be construed as official or reflecting the views of the Department of the Army. Y!olonel, U.S. Army, DC; Chief, Removable Prosthodontic Service; Assistant Director, Prosthodontic Residency Program, U.S. Army DENTAC, Fort Gordon, Ga. bLieutenant Colonel, U.S. Army, DC; Assistant Chief, Removable Prosthodontic Service, U.S. Army DENTAC, Fort Gordon, Ga. cAssistant Professor, Department of Prosthodontics, Emory University, School of Postgraduate Dentistry. 10/4/22659
Fig. 2. Alginate blockout of wax rim and CJR record.
Fig. 3. Alginate blockout cut back to expose borders of final impression.
Fig. 1. Final impression with contoured wax rim and CJR record.
THE
JOURNAL
OF PROSTHETIC
DENTISTRY
terial that will undergo some manipulation without damage, such as a polysulfide impression material. 3. Use the final impression as the record base and make the centric jaw relation (CJR) record. Attach the CJR record material securely to the wax occlusion rim (Fig. 1). The material chosen to register the CJR should also be stable and strong enough to undergo manipulation
821
TIPS
FROM
OUR
READERS
Fig, 4. Final impression shows land area established by boxing technique. Fig. 5. Master cast on articulator using preserved CJR record. without major distortion. Modeling compound works well. If desired, include an anterior tooth try-in and fzka343owtransfer at this time. 4: RIO& out the CJR record with a thinned irreversible hy@roc&oid mixture obtained by using a 2:l water/ poader r&o. Cover the entire CJR record and contoured %ax oechrdon rim with this mixture. After final set, c.ut back the irreversible hydrocoiloid to expose the borders of the final impression (Figs. 2 and 3). 5. Pour the final impression with the blocked out CJR record by using the boxing technique advocated by Morrow et al.’ (Fig. 4). The irreversible hydrocolloid blookout prevents the loss of the CJR record. 6. Remove the boxing m&&al and the irreversible hydro&ioid bfockout. Place the master cast on an artic-
ulator, before separation from the combined final impression and occlusion rim, by using the preserved CJR record (Fig. 5). 7. After separation of the master cast from the final impression, construct a new wax occlusion rim duplicating the original contoured wax rim. The articulated casts are now ready for the arrangment of teeth. REFERENCE 1. Morrow RM, Rudd KD, Eiesman HF. Dental laboratory procedures. let ed. St Louis: CV Mosby, 1980;58-66.
Reprint requests to: DR. WILLUM A. KRANTZ 863 SPARKLEBERRYRD. EVANS, GA 30809
jaw relation hydrocolloid
records
DDSC
This article presents a technique that combines the final impression and centric jaw relationship appointments. It can be used with complete dentures, single dentures, and altered cast impressions. TECHNIQUE 1. Make a custom final impression tray with a wax occlusion rim on the preliminary cast. For a removable partial denture with a distal-extension base, attach the tray and occlusion rim to the framework retentive mesh. Then remove the distal-extension part of the cast. 2. Complete border molding and make final impressions in a conventional manner. Choose a final impression ma-
The opinions or assertions contained herein are the private ones of the authors and are not to be construed as official or reflecting the views of the Department of the Army. Y!olonel, U.S. Army, DC; Chief, Removable Prosthodontic Service; Assistant Director, Prosthodontic Residency Program, U.S. Army DENTAC, Fort Gordon, Ga. bLieutenant Colonel, U.S. Army, DC; Assistant Chief, Removable Prosthodontic Service, U.S. Army DENTAC, Fort Gordon, Ga. cAssistant Professor, Department of Prosthodontics, Emory University, School of Postgraduate Dentistry. 10/4/22659
Fig. 2. Alginate blockout of wax rim and CJR record.
Fig. 3. Alginate blockout cut back to expose borders of final impression.
Fig. 1. Final impression with contoured wax rim and CJR record.
THE
JOURNAL
OF PROSTHETIC
DENTISTRY
terial that will undergo some manipulation without damage, such as a polysulfide impression material. 3. Use the final impression as the record base and make the centric jaw relation (CJR) record. Attach the CJR record material securely to the wax occlusion rim (Fig. 1). The material chosen to register the CJR should also be stable and strong enough to undergo manipulation
821
TIPS
FROM
OUR
READERS
Fig, 4. Final impression shows land area established by boxing technique. Fig. 5. Master cast on articulator using preserved CJR record. without major distortion. Modeling compound works well. If desired, include an anterior tooth try-in and fzka343owtransfer at this time. 4: RIO& out the CJR record with a thinned irreversible hy@roc&oid mixture obtained by using a 2:l water/ poader r&o. Cover the entire CJR record and contoured %ax oechrdon rim with this mixture. After final set, c.ut back the irreversible hydrocoiloid to expose the borders of the final impression (Figs. 2 and 3). 5. Pour the final impression with the blocked out CJR record by using the boxing technique advocated by Morrow et al.’ (Fig. 4). The irreversible hydrocolloid blookout prevents the loss of the CJR record. 6. Remove the boxing m&&al and the irreversible hydro&ioid bfockout. Place the master cast on an artic-
ulator, before separation from the combined final impression and occlusion rim, by using the preserved CJR record (Fig. 5). 7. After separation of the master cast from the final impression, construct a new wax occlusion rim duplicating the original contoured wax rim. The articulated casts are now ready for the arrangment of teeth. REFERENCE 1. Morrow RM, Rudd KD, Eiesman HF. Dental laboratory procedures. let ed. St Louis: CV Mosby, 1980;58-66.
Reprint requests to: DR. WILLUM A. KRANTZ 863 SPARKLEBERRYRD. EVANS, GA 30809
