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News Bulletin : ADA News Bulletin September 2010
37 SEPTEMBER 2010 clinical hints items 1 and 2) are used to prepare a space around the post-end and provide access for the threading tool (Item 3), which has a threading die on its end, and a cross bar to provide leverage for the threading process, two turns only. Once the post-end has been threaded, the washer or washers, plus a rubber washer, (between Items 3 and 4, and absent from the kit but mentioned in the instructions) are placed against the root face, and the inner post-removing tool (Item 5) is inserted past the washers and screwed onto the threaded end of the post. The outer component of the post-removing tool is now screwed down against the washers, and the pressure so applied lifts the post out without damaging the face of the root. The 'mystery object' is not pictured or mentioned in the instructions, and may have no other purpose than to serve as a place to store the washers, but this does not explain why it appears to have a broken, possibly threaded tip. Alas, we may never know. Scott, Peter and Bill came close to providing a correct answer, but we thought Bill was closest, because he mentioned a trepan, which is pretty close to a trephine (look them up in the Macquarie Dictionary), so we awarded him the ADA paperweight. Only dental historians or those now in retirement are likely to know much about circa 1914 post-crowns. There were many variants used. Richardson's Mechanical Dentistry (my copy inscribed 'Presented to the NSW Dental Association by Bosch Bartel & Co, 10 October, 1907') divided them into two classes, "one having one end of the pin or post baked into the porcelain when the crown is made, such as the Logan, Brown and the new Richmond... and those attached to the root by a pin, post or screw, one end of which is first cemented into the root, and the other afterward to the crown... such as the Bonwill, How, Gates Forster and Howland". We might infer, from SS White's 1914-patented post extractor that broken posts were commonplace, probably because dental metallurgy was in its infancy. Dentistry has come a long way in 100 years, and broken posts are now a rarity. We can thank dental researchers and the dental trade for this and similar advances. Honorary Clinical Associate Professor, Barrie R D Gillings, 121 Bannockburn Road, Turramurra 2074. Phone: 02 9144 3787; Fax: 02 9440 9159; e-mail firstname.lastname@example.org Scared of running out of medical oxygen? www. rl qu h l hc r .c m. u Changes to Australian Standards (AS2473.3) for medical oxygen mean that you will need to upgrade your oxygen regulators and your manifold system by the following dates: • SA/WA/NT Quarter 1 2010 • QLD August 2010 • NSW/ACT February 2011 • VIC/TAS June 2011 Call us now on 1300 36 02 02 and enquire about our solutions. Integrated oxygen cylinders PRESENCETM Low maintenance oxygen regulators NOVA 40 Audit of medical oxygen systems and gas installation Relative Analgesia MATRX nitrous oxide sedation systems WE INVITE YOU TO PARTICIPATE AND REGISTER NOW! 34th Australian Dental Congress Back to the Future: Now and Tomorrow 30 March to 3 April 2011 Brisbane Convention and Exhibition Centre, Brisbane Australia (see details on page 6.)
ADA News Bulletin August 2010
ADA News Bulletin October 2010