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May 17-23, 201016 Implant Tribune United Kingdom Edition I t was the year 1999 when Kim et al. stated that: ‘The use of cement-retained implant prosthesis is increasing because of improved occlusal anatomy, esthetics, and simplified labora- tory procedures. Little is known about the biomechanics of cement retained implant prosthesis com- pared with that of screw retained implant prosthesis.’ While comparing, ‘cement retained versus screw retained implant restoration’, Michalakis et al. reviewed the literature in 2003. His research emphasised the following factors: (1) Ease of fabrication and cost, (2) passivity of the frame- work, (3) retention, (4) occlu- sion, (5) esthetics, (6) delivery, (7) retrievability. Weber et al. (2007) could not find enough evidence to prove any significant difference among restoration design and treatment outcome and Chee et al. (British Dental Journal 2006; 201: 501- 507) summarised the differences they have identified: • Screw-retained restorations are more easily retrieved and maintained • Cemented restorations can accommodate more implant positions • Screw-retained restorations are easier to manage when im- mediately loading implants. Screw loosening is among the biggest post-loading problems. Cavazos et al. (1996) summa- rise reasons for screw loosening: ‘Screw stretch, less than ideal implant position, inappropr- iate occlusal scheme or crown anatomy, variations in hex di- mension coupled with equal variations in the abutment counterparts, slight differences in fit and accuracy, tension on abutment and cylinder from ill- fitting restorations.’ Several approaches have been researched and suggested to avoid screw loosening, from silicon to resin sealing, from screw material innovation to coating techniques. Fit variation As early as 1961, Kurosu and Ide demonstrated that marginal fit of cemented restorations var- ies between 20 and 90 microns. Wilson et al. proved in 1990 the deformation of restorations with the cementation procedure. Kim et al. (1999) measured the deflec- tion of prosthesis at loading time: ‘In the single-crown situation, the provisional cement-retained implant crown transferred less stress to the implant fixture and supporting structure than the screw-retained and the permanent-cement-retained Screw versus cement-retained, im- plant-supported prosthetic restorations Professor Liviu Steier discusses passive-fit, ce- mention hydraulics/overhangs and retrievability of implant-supported prosthetics Scaling Tips (pack of 3) Code Description E S A Price BAC161 Scaling tip to remove supragingival calculus • • • £89 BAC162 Scaling tip to remove supragingival heavy calculus • • £89 BAC163 Scaling tip to remove calculus on supragingival, subgingival & interdental • • £89 BAC164 Scaling tip to remove all supragingival calculus • • • £89 BAC165 Scaling tip to remove supragingival and neck calculus • • • £89 BAC166 Scaling tip to remove all supragingival calculus • • • £89 Perio Tips (pack of 3) Code Description E S A Price BAC171 Perio tip to remove supragingival calculus • • • £89 BAC173 Perio tip to level off the surface of endo during the periodontal falp surgery • • • £89 BAC174 Perio tip to remove supragingival & interdental calculus • • • £89 Code Description Price BAC150E BA/EMS type handpiece £229 BAC150S SATELEC type handpiece £159 BACS122 Tip Changer for scaling & Perio tips £7.99 Code Description Price BAC100 Complete BA unit with 2 handpieces and 6 tips £699 BAC100 BAC150 Range & BACS122 UK’s Dental Handpiece Specialists Tel: 01604 777700 Fax: 01604 721844 Email: sales@bainternational.com Web: www.bainternational.com B.A. International, Unit 9, Kingsthorpe Business Centre, Studland Road, Kingsthorpe, Northampton NN2 6NE, England. EMS® is a registered trademarks of EMS Electro Medical Systems SA, Switzerland. Satelec® is a registered trademarks of Acteon Group, France. KAVO® and MULTIflex LUX® are registered trademarks of Kaltenbach and Voigt GmbH & Co., Germany. Sirona® is a registered trademark of Sirona Dental Systems GmbH, Germany. W&H® and Roto Quick® are registered trademarks of W&H Dentalwerk Bürmoos GmbH, Austria. Bien-Air® and Unifix® are registered trademarks of Bien-Air Dental S.A., Switzerland. N.B. All prices in this publication exclude VAT and are only valid for as long as stocks last. Offer valid until xxx 2010, is subject to availability and may not be used in conjunction with any other offers or promotional prices. Offers must be mentioned at the time of ordering. © 2010 B.A. International, Unit 9, Kingsthorpe Business Centre, Studland Road, Kingsthorpe, Northampton NN2 6NE, England. E & O E. B.A. Handpiece and small equipment range available from B.A. International and our Exclusive Dealers... Henry Schein Minerva England: 08700 10 20 43 Wales: 029 2044 2888 N.Ireland: 028 9037 3702 Scotland: 0141 952 9911 Get 2 bottles of fine polishing powder and a spare autoclavebale head BA720 Ultimate Air Polisher BA720K KaVo fitting £549 £489 BA720B Bien Air fitting Code Description Price BA720W W&H fitting BA720 S Sirona fitting BA720 N NSK fitting BA17KM Supersonic scaler with screw-on connection (Midwest 4-hole) BA17KB Supersonic scaler with screw-on connection (Borden 2-hole) £299 Code Description Price £549 £489 £549 £489 £549 £489 £549 £489 B.A. International 01604 777700 Kent Express 01634 878787 SAVE £189 + VAT BA17KK For KaVo MULTIflex coupling connection £399 £299 B.A. Ultimate Air Scalers • Compact, ergonomic and very quiet • New innovation: vibration frequency 17Khz • Autoclavable up to 135 o C • Includes 3 tips and an autoclavable tip changer B.A. Ultimate Hygiene Range includes a wide range of products for all your needs: Complete stand alone unit with water supply, handpieces and a range of tips covering scaling, periodontic and endodontic applications. • E Range: for BA International and EMS type handpieces. • S Range: for Satelec and NSK type handpieces. • A Range: for Sirona type handpieces. NEWPack of 3 TipsFrom £89+ VAT B.A. Ultimate Piezo Unit • Three Functions (scaling, Endo and Perio) • Supplied with two autoclavable handpieces and 6 tips • Two water bottles (300ml and 400ml) • Adjustable power and water supply BA720 Ultimate Air Polisher • Ergonomic design, very well balanced • Colour: ivory white • Excellent visibility • Great grip, rotatable head for difficult access • Available with your chosen coupling connection: KaVo, W&H, NSK, Sirona or Bien Air • Very light: only 147g • Low powder usage: 4g/min • Fully autoclavable NEW Jxx-05-10BA Smile Ad 4/5/10 10:16 Page 1

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