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Implant Tribune United Kingdom Edition

January 2014United Kingdom Edition12 Implant Tribune Saving minutes, saves lives. BOC LIFELINE® emergency resuscitation equipment. LIFELINE oxygen kit → Lightweight oxygen cylinder → Built in regulator → Next working day refills† → Variety of oxygen masks → Single annual service charge Prices from £197 + VAT per annum HeartSine Samaritan Automated External Defibrillators* → Monthly payment option available → Real time CPR feedback on the 500P model → 10 year warranty → User friendly with easy to understand visual voice prompts → Monthly payment option available Prices from £799 + VAT BOC Healthcare Customer Service Centre, Priestley Road, Worsley, Manchester M28 2UT, United Kingdom Tel 08456 447 764, Fax 0845 087 0062, bochealthcare-uk@boc.com, www.bochealthcare.co.uk The stripe symbol and the letters BOC are registered trade marks of The BOC Group Limited. Both BOC Limited and The BOC Group Limited are members of The Linde Group, the parent company of which is Linde AG. Reproduction without permission is strictly prohibited. © BOC Limited 2013 * manufactured by HeartSine Technologies Ltd † depending on geographic location, refill fees applies BOC Healthcare can provide your dental practice with emergency resuscitation equipment: BOC: Living healthcare For further information or to place an order, call 0161 930 6010 quote reference RF278 to compare between a wide im- plant restoration versus the two implant restoration of lower first molar. Material and Methods Three different parts were mod- elled to simulate the studied cas- es; the jaw bones, implant/abut- ment assembly, and crown. Two of these parts (jaw bone and im- plant/abutment) were drawn in three dimensions by commercial general purpose CAD/CAM soft- ware “AutoDesk Inventor” ver- sion 8.0. These parts are regular, symmetric, and its dimensions can be simply measured with their full details. On the other hand, crown is too complicated in its geometry therefore it was not possible to draw it in three dimensions with sufficient accuracy. Crown was modelled by using three-dimen- sional scanner, Roland MDX-15, to produce cloud of points or tri- angulations to be trimmed before using in any other application. The second phase of difficulty might appear for solving the en- gineering problem, is importing and manipulating three parts one scanned and two modelled or drawn parts on a commer- cial FE package. Most of CAD/ CAM and graphics packages deal with parts as shells (outer sur- face only). On the other hand the stress analysis required in this study is based on volume of dif- ferent materials.3 Therefore set of operations like cutting vol- umes by the imported set of sur- faces in addition to adding and subtracting volumes can ensure obtaining three volumes repre- senting the jaw bone, implant/ abutment assembly, and crown.2 Bone was simulated as cylinder that consists of two parts. The inner part represents the spongy bone (diameter 14mm and height 22mm) that filling the internal space of the other part (shell of 1mm thickness) that represents cortical bone (diameter 16mm and height 24mm). Two implants were modelled one of 3.7mm di- ameter and the other of 6.0mm. The implants/abutment design and geometry were taken from Zimmer dental catalogue (Fig. 5). Linear static analysis was per- formed. The solid modelling and finite element analysis were per- formed on a personal computer Intel Pentium IV, processor 2.8 GHz, 1.0 GB RAM. The meshing software was ANSYS version 9.0 and the used element in meshing all three dimensional model is eight nodes Brick element (SOL- ID45), which has three degrees of freedom (translations in the global directions). Listing of the used materials in this analysis is found in Table 1. The two models page 11DTß ‘On the other hand the stress analysis required in this study is based on volume of different materials’ Fig 5 Fig 6a Tel 08456447764, Fax 08450870062, bochealthcare-uk@boc.com, www.bochealthcare.co.uk call 01619306010

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