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 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.
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.