TIP8 FROM OUR READERS
REFERENCES 1. Branemark P-I, Zarb GA, Albrektsson T. Tissue-integrated prostheses. Chicago: Quintessence Publishing Co, Inc, 1985. 2. Axinn S, Boucher L. Use of a stabilized record base in osseointegration. J PROSTHETDENT 1988;59:637-8.
aintaining
a dry field
during
Reprint requests to: DR. JOHN W. MCCARTNEY USA AREADENTAL LABORATORY WALTERREED ARMY MEDICAL CENTER WASHINGTON,DC 20307-5200
cementation
procedur
AIL Bolouri, DMD, DDSa Baylor College of Dentistry, Dallas, Tex. Faulty cementation techniques can cause failure of restorations regardless of how accurately the previous steps have been accomplished. Maintaining a dry field during the set of the cement is critical because all luting agents are affected by m0isture.l A restoration may appear to be cemented accurately, but the cement will exhibit increased solubility when moisture contamination occurs (Fig. 1). Moisture control is most difficult in the lower portion quadrant. The use of systemic drugs to temporarily decrease the flow of saiiva during preparation of teeth and making impressions has been recommended.2 However, this may not be practical for the short period required for cementation. When the teeth are closed during cementation, contact of the tongue with the luting agent can cause contamination of the cement. A simple procedure is described that can help the dentist maintain a dry field during the critical time of cementation.
Fig. 2. Full gold crown restoration is tried on mandibular second premolar.
1. Try in the restoration for marginal, occlusal, and proximal fit and make the necessary adjustments (Fig. Z).3 aProfessor, Department 10/4/31346
of Removable
Prosthodontics.
Fig. 1. Recurrent decay under full cast crown restoration with adequate marginal adaptation.
132
Fig. 3. Disposable saliva ejector with self-curing acrylic resin
block
attached.
JANUARY
1992
VOLUME
67
NUMBER
1
TIPS
FROM
OUR
READER5
6. Proceed with the cementation by baving the patient close on the self-curing resin block with the saliva ejector in place (Fig. 4). 7. If necessary, increase the volume of the evacuation system to ensure quick removal of the excess saliva. Facial surfaces of restorations can be kept dry with cotton rolls. For large restorations or when the salivary flow is exceptionally heavy, two sahva ejectors can be used simultaneously. 8. After the cement is set, proceed in the usual manner.3
Fig. 4. A dry field is maintained by evacuating saliva while patient has teeth closed on resin block during cementation. 2. Add a small amount of clear self-curing resin to a disposable saliva ejector tip that has already been adjusted to the patient’s mouth (Fig. 3). 3. With the restoration in place and while the self-curing resin is still soft, position the saliva ejector and have the patient close into the self-curing resin on the saliva ejector. 4. Have the patient open and close on the resin-covered saliva ejector a few times to reduce the resin thickness. 5. After setting, trim the resin if necessary.
Availability
CONCLUSION This simple technique not only keeps the mouth dry during cementation but helps to keep the tongue away from the fresh cement. The occlusal block made by the resin also applies pressure to the restoration to ensure complete seating. REFERENCES 1. Craig RG. Restorative dental materials. 7th ed. St Louis: CV Mosby Co, 1985;165-97. 2. Shillingburg HT, Hobo S, Whittsett LD. Fundamentals of fixed prosthodontics. 2nd ed. Chicago: Quintessence Publishing Co, 1981;199. 3. Shillingburg HT, Hobo S, Whittsett LD. Fundamentals of fixed prosthodontics. 2nd ed. Chicago: Quintessence Publishing Co, 1981; 380-Z. Reprint requests to: DR. ALI BOLOURI BAPLOR COLLEGE OF DENTISTRY 3302 GASTON AVE. DALLAS, TX 75246
of JOURNAL back issues, 1986-1991
Back issues of THE JOURNAL OF PROSTHETIC DENTISTRY are available for purchase from the publisher, Mosby-Year Book, Inc., at a cost of $7.00 per issue. (Foreign postage is not included.) The following quantity discounts are available: 25 % off on quantities of 12 to 23, and one third off on quantities of 24 or more. Please write to Mosby-Year Book, Inc., Subscription Services, 11830 Westline Industrial Drive, St. Louis, MO 63146-3318, or call (800)325-4177, ext. 4351, or (314)453-4351 for information on availability of particular issues for that period from 1980 to 1991. If unavailable from the publisher, photocopies of complete issues are available from University Microforms International, 300 N. Zeeb Rd., Ann Arbor, MI 48106, (313)761-4700.
THE
JOURNAL
OF PROSTHETIC
DENTISTRY
133
REFERENCES 1. Branemark P-I, Zarb GA, Albrektsson T. Tissue-integrated prostheses. Chicago: Quintessence Publishing Co, Inc, 1985. 2. Axinn S, Boucher L. Use of a stabilized record base in osseointegration. J PROSTHETDENT 1988;59:637-8.
aintaining
a dry field
during
Reprint requests to: DR. JOHN W. MCCARTNEY USA AREADENTAL LABORATORY WALTERREED ARMY MEDICAL CENTER WASHINGTON,DC 20307-5200
cementation
procedur
AIL Bolouri, DMD, DDSa Baylor College of Dentistry, Dallas, Tex. Faulty cementation techniques can cause failure of restorations regardless of how accurately the previous steps have been accomplished. Maintaining a dry field during the set of the cement is critical because all luting agents are affected by m0isture.l A restoration may appear to be cemented accurately, but the cement will exhibit increased solubility when moisture contamination occurs (Fig. 1). Moisture control is most difficult in the lower portion quadrant. The use of systemic drugs to temporarily decrease the flow of saiiva during preparation of teeth and making impressions has been recommended.2 However, this may not be practical for the short period required for cementation. When the teeth are closed during cementation, contact of the tongue with the luting agent can cause contamination of the cement. A simple procedure is described that can help the dentist maintain a dry field during the critical time of cementation.
Fig. 2. Full gold crown restoration is tried on mandibular second premolar.
1. Try in the restoration for marginal, occlusal, and proximal fit and make the necessary adjustments (Fig. Z).3 aProfessor, Department 10/4/31346
of Removable
Prosthodontics.
Fig. 1. Recurrent decay under full cast crown restoration with adequate marginal adaptation.
132
Fig. 3. Disposable saliva ejector with self-curing acrylic resin
block
attached.
JANUARY
1992
VOLUME
67
NUMBER
1
TIPS
FROM
OUR
READER5
6. Proceed with the cementation by baving the patient close on the self-curing resin block with the saliva ejector in place (Fig. 4). 7. If necessary, increase the volume of the evacuation system to ensure quick removal of the excess saliva. Facial surfaces of restorations can be kept dry with cotton rolls. For large restorations or when the salivary flow is exceptionally heavy, two sahva ejectors can be used simultaneously. 8. After the cement is set, proceed in the usual manner.3
Fig. 4. A dry field is maintained by evacuating saliva while patient has teeth closed on resin block during cementation. 2. Add a small amount of clear self-curing resin to a disposable saliva ejector tip that has already been adjusted to the patient’s mouth (Fig. 3). 3. With the restoration in place and while the self-curing resin is still soft, position the saliva ejector and have the patient close into the self-curing resin on the saliva ejector. 4. Have the patient open and close on the resin-covered saliva ejector a few times to reduce the resin thickness. 5. After setting, trim the resin if necessary.
Availability
CONCLUSION This simple technique not only keeps the mouth dry during cementation but helps to keep the tongue away from the fresh cement. The occlusal block made by the resin also applies pressure to the restoration to ensure complete seating. REFERENCES 1. Craig RG. Restorative dental materials. 7th ed. St Louis: CV Mosby Co, 1985;165-97. 2. Shillingburg HT, Hobo S, Whittsett LD. Fundamentals of fixed prosthodontics. 2nd ed. Chicago: Quintessence Publishing Co, 1981;199. 3. Shillingburg HT, Hobo S, Whittsett LD. Fundamentals of fixed prosthodontics. 2nd ed. Chicago: Quintessence Publishing Co, 1981; 380-Z. Reprint requests to: DR. ALI BOLOURI BAPLOR COLLEGE OF DENTISTRY 3302 GASTON AVE. DALLAS, TX 75246
of JOURNAL back issues, 1986-1991
Back issues of THE JOURNAL OF PROSTHETIC DENTISTRY are available for purchase from the publisher, Mosby-Year Book, Inc., at a cost of $7.00 per issue. (Foreign postage is not included.) The following quantity discounts are available: 25 % off on quantities of 12 to 23, and one third off on quantities of 24 or more. Please write to Mosby-Year Book, Inc., Subscription Services, 11830 Westline Industrial Drive, St. Louis, MO 63146-3318, or call (800)325-4177, ext. 4351, or (314)453-4351 for information on availability of particular issues for that period from 1980 to 1991. If unavailable from the publisher, photocopies of complete issues are available from University Microforms International, 300 N. Zeeb Rd., Ann Arbor, MI 48106, (313)761-4700.
THE
JOURNAL
OF PROSTHETIC
DENTISTRY
133
