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News Bulletin : ADA News Bulletin June 2011
50 JUNE 20 11 Compiled by Associate Professor Barrie Gillings clinical hints * A thin slab of good opal, backed by dull, opaque 'potch' or opal 'matrix'. COMMUNICATIONS We have a reader who regularly submits TEASER answers which are too late for the publication deadline. Your Compiler is occasionally guilty of a related dilatory response, i.e., failure to respond to letters, e.g., Jim Grainger (Kingscliff 2487) who, six months ago, wrote about scrimshaw. You can read about it below. Chris Daly (Sydney 2000), an old Army buddy, had a patient, a keen oenophile, who was about to wear his first cobalt/ chromium denture. Expert tasters say that wines, especially reds, should not be drunk from metal containers, and he wondered whether his new denture would upset his enjoyment. Chris pre-empted the obvious answer by stating that the patient was not interested in a gold denture. The answer is that cobalt/chromium dentures are extremely resistant to corrosion, because of the tenacious chromium oxide surface layer. Dentures left in red wine for days remain stain-free. There may be a very slight electrochemical effect if the denture base abuts an amalgam or gold restoration, but your Commentator has not read any reports of this. But he advised Chris that he will, if sent a case or two of quality reds, test them to destruction. Mike Richardson (email@example.com) apologised for his late response to the opal teeth denture TEASER. He explained that Geoff and Margaret Brown's friend Harold Hodge asked them to make the denture, but they were going on holidays, and asked Mike to do the job. Harold Hodge, a well known Parkes character, was the 'unofficial' mayor of Lightning Ridge, who returned to Parkes for major shopping. Harold had a large bag of opal doublets,* and Mike selected suitable stones, shaped and polished them to resemble artificial denture teeth and made the denture. Harold was happy with his special denture, whose appearance was actually ghastly but always amusing. On his death the denture was displayed behind a small glass window inabrickwallattheendofthebarin 'The Digger's Rest'. It was later stolen, but recovered and is now in the possession of friends. Mike once fitted a ruby, sapphire and diamond in gold crowns on 13, 23 and 43 for a Gypsy, and is still practising after 48 years, so now you know where to go if you need dental jewellery. That clinical hinter sans pareil, Mark Knapp (South Yarra 3141) wrote that he and partner Marg are now the proud owners of two labradoodle puppies, which, like most puppies, need training, not only of the toilet variety, but also to obey commands. Marg is now taking them to a puppy school, which, Mark advises, has the rather cute title of 'Sit Happens'. Vin(cent) Amerena (Elwood 3184) acknowledged his mention in the last Column as a proof-reader by finding a plethora of errors therein, 13 of which your Inditer finds picayune. But your Columnist acknowledges that he did spell Dr Custance two ways (my apologies, Douglas), and that be should have been by. Vin concluded his covering letter with: "Keep producing the verbiage -- it gives you an interest and keeps the few brain cells left synapsing". Vic Bird (Bowraville 2449), who is interested in climate science, e-mailed details of a book by Professor Ian Plimer, a geologist at the University of Adelaide, on climate change. Your Scrivener was able to give Vic details of a book about climate change sceptics, written by Naomi Oreskes, Professor of History and Science, University of California and entitled Merchants of Doubt, (Bloomsbury Press, ISBN 10 1596916109). She is participating in the Sydney Writers Festival (May 16--22). If you wish to know more Google her name; the book title or The Sydney Festival. Vic also suggested Googling 'Sebastian Vilar Rodrigez' for an essay on religious intolerance. Finally, Paul Keightley (Mooloolaba 4557) e-mailed that he had run out of 'chromic acid' that he dabs onto localised gum infections, and the local pharmacy did not know what it is and sought guidance. Your Expositer replied that in the 1950s its application, followed by hydrogen peroxide, was the accepted treatment for acute necrotising ulcerative gingivitis ANUG (Vincent's infection, trench mouth). The gingivae were nearly always too tender for scaling, which was what was really required. Chromic acid dissolved the necrotic tissue, the peroxide killed the anaerobic organisms and a day or so later, scaling could commence. An old Materia Medica book formula is: sodium or potassium dichromate 5 g and boric (boracic) acid 4 g, dissolved in water (Dental Cosmos 74;538, June 1932). Modern treatment recommends hydrogen peroxide rinses, careful debridement and a course of metronidazole tablets. AN EMENDATION Your Wordsmith 'waxed eloquent' about the words 'forty' and 'fourty', stating that bankers introduced 'forty' to avoid 'four' being enhanced to 'fourty' on cheques. This is incorrect. Forty was used as a spellling as long ago as the 16th century and well before cheques were invented. The word appears in Samuel Johnson's dictionary of 1755. SCRIMSHAW This is the art of carving and engraving whale ivory, or, as we dentists would say, whale tooth dentine. Its collection
ADA News Bulletin May 2011
ADA News Bulletin July 2011