Questions & Answers

Questions & Answers

QUESTIONS & ANSWERS Readers are invited to subm it questions to The Journal's Questions and Answers section. A n s w e rs provided by experts are sen...

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Readers are invited to subm it questions to The Journal's Questions and Answers section. A n s w e rs provided by experts are sent to questioners in advance of publication. Questions should relate to the a rt and science of dentistry.

th e common surface deposits such as to ­ bacco tar. If th e denture is thoroughly brushed w ith soap regularly, however, these deposits w ill not occur. It is neces­ sary to be certain th a t a ll parts of the den­ tu re are brushed well. Harsh abrasives w ill not seriously a ffe ct the chrom ium -co­ b a lt castings b u t w ill abrade th e a crylic bases severely. The best way to remove th e darkening and s lig h t e tch in g is by polishing. If the ch ro m ium -cobalt alloy has been severely etched by th e ch io rin e -co n ta in in g solution, it may be necessary to remake it. The patients should be told to avoid the use of any so lutions th a t smell o f chlorine and should be instructed how to select and how to use a suitable denture brush.— George C. Paffenbarger, DDS, ADA, Na­ tio n a l Bureau o f Standards, Washington, D.C. 20234

Burning sensation from dentures Claims o f compliance with A D A specification no. 5 Q. D o dental golds listed and sold by Rx Gold Co., 40 Schenck Ave., Great Neck, N .Y ., comply with of­ ficial specifications o f the American Dental Association for certified den­ tal casting gold alloys?— m i c h a e l p . l a v i g n a , d d s , 20050 Lake Shore Blvd., Euclin, Ohio 44123.

Dental Association List of Certified Dental M aterials.” The latest revision of th e iis t appeared in the February, 1967, issue o f The Journal o f the Am er­ ican Dental Association. This lis t is made available fo r reference as a qual­ ity gu id e in th e purchase of dental ma­ te ria ls.—John W. Stanford, PhD, Secre­ tary, Council on Dental M aterials and Devices, Am erican Dental Association, 211 E. Chicago Ave., Chicago, 60611.

Chromium-cobalt discoloration


The Am erican Dental Association C ouncil on Dental M aterials and Devices has received several in q u iries regard­ ing various cla im s of com pliance w ith ADA sp e cifica tio n no. 5 fo r dental cast­ ing gold alloy under th e names RxA, RxB, RxC, and RxlV being d istribu te d ' b y.R x Gold Co. The Association has a t­ tem pted, w ith o u t success, since Decem­ ber, 1964, to obtain copies of com plete laboratory data th a t would show that th e fo u r alloys are being tested fre ­ q u e n tly fo r com pliance w ith every re­ qu ire m e n t o f ADA specification no. 5. The fo u r alloys in question do not ap­ pear on th e Association’s “ List of Cer­ tifie d Dental M aterials.” The Council th in k s th a t th e resp o n sib ility fo r in itia l­ ly d e term in in g th a t a p roduct com plies w ith an o ffic ia l sp ecification of the Association and fo r guaranteeing th a t such a product w ill co n tin ue to meet s p e cifica tio n rests w ith the m anufac­ tu re r and not w ith th e ADA. M anufacturers who are p a rticip a tin g in the A ssociation’s ce rtific a tio n pro­ gram fo r dental m aterials and who have successfully c e rtifie d various products are perm itted to use the statem ent that fo llo w s fo r labeling and advertising: “ T his p roduct appears on the American

Q. Occasionally I see chromiumcobalt framework o f partial dentures which is discolored so that it is al­ m ost black. I understand that this dis­ coloration may be caused by denture cleaners that contain chlorine. D o chlorine-containing cleansers cause this discoloration? Are there other causes? Is there any method for cor­ recting the situation after discolora­ tion has occurred? What instructions should I give patients with partial dentures to prevent discoloration?— T H O M A S P . F R E E M A N , U S A F , D C , Edgew ood Arsenal, Md. 21010 A.

Dental chrom ium -cobalt casting a l­ loys for dentures, sold under such trade brand names as Dentorium , Durallium , N iranium , Rx, T iconium 50, and V ita llium are attacked by chlorine. Therefore, ch lo rine -co n tain in g bleaches should nev­ er be used to clean such dentures. To the best of m y knowledge, the only o th e r causes o f discoloration of dentures made w ith a chrom ium -cobalt alloy are

Q. I have a patient who has worn a complete upper denture for the past few years. Several dentures have been made for him in various offices, but he has experienced a burning sen­ sation while wearing each denture. I established proper border outlines and tried various measures o f sup­ portive treatment (vitamin therapy), to relieve his discomfort. The patient has recently been examined medical­ ly, but results were negative. His present denture is fabricated with Lucitone. His original denture had a metal palate that did not provide re­ lief. What may be done to eliminate this problem?— S i d n e y l i e b e r m a n , d d s , Baltimore, 21215. A.

I suggest th a t a com petent derma­ to lo g is t ascertain if the pa tie nt is a lle r­ g ic to the denture base m aterial. The pa­ tie n t may also be soaking th e denture in a so lu tio n or cleaning it w ith some agent th a t causes an irrita tio n . The denture w ith th e metal palate caused irrita tio n , too, b u t the plastic portions of the den­ tu re o r the cleaning agent could have been th e causes o f the burning sensa­ tio n . If th e pa tie nt is allergic, I would suggest an all porcelain denture. The D entists’ Supply Company o f York, Pa., used to make all porcelain dentures. There may also be some im pingem ent on the nerves em erging from th e ante­ rio r and posterior palatine foram ens. Re­ lie f of the denture in these regions m ight help to e lim in a te irrita tio n .—George C. Paffenbarger, DDS, ADA National Bu­ reau o f Standards, Washington, D.C. 20234.