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ePaper created 2017-11-27, 09:07:05 | version 1.38.0
34 exhibitors Greater New York Dental Meeting — Nov. 27, 2017 ‘RFA technique must be accurate and reliable’ By today Staff n Resonance Frequency Analysis (RFA) today is a standard method to measure implant stability, but the measurement unit ISQ itself needs to be explained. Prof. Lars Sennerby is one of the developers and researchers behind the RFA technique and will help explain the procedure. Prof. Sennerby, what is your experience of the RFA technique? Prof. Neil Meredith showed me a prototype of his invention already in 1992, and we have since then used RFA for implant stability meas- urements in numerous experimental and clinical studies: first as part of the early development work and Dr. Meredith’s Swedish PhD thesis (1997), which I supervised, and then as a clinical routine diagnostic instru- ment. I find it to give valuable and relevant information about implant stability at any time point during implant treatment and follow-up. What is the background to the ISQ unit? The whole purpose of introducing the ISQ (Implant Stability Quotient) was to give clinicians a unique and easy quantity on a scale from 1–100; the higher the value the better the stabil- ity. ISQ was introduced in 2001 and derives from a linear recalculation of the resonance frequencies (RF) in Hertz (Hz) obtained from measure- ments of dental implants with the first generation of wire-bound trans- ducers. How do you define the ISQ unit? ISQ is calculated from the underly- ing RF of the transducer peg using a mathematical equation. The ISQ unit has not yet been defined using any other general or specific unit, simply 5 Prof. Lars Sennerby because there is no such unit avail- able. Instead, empirical data from more than 800 scientific publications has guided clinicians how to use the ISQ scale clinically. How do we then know that implants with the same stability have the same ISQ? It is, of course, desirable that differ- ent pegs for different implant designs give the same ISQ value if they have the same implant stability. This is a known problem when calibrating transducer pegs for different implant designs. It has not been so easy to solve because implant stability per se has not been defined using any other quantity, and a reference had to be created. The reference can then be used when transducers are designed and developed. To explain the prob- lem, think of two different implant designs that are placed in identical material and two different ISQ values are obtained. It is impossible to know if the difference depends on the fact that the two pegs are different or if it is because the stability is actually dif- ferent, or a combination of the two. So a reference is indeed necessary. Here in New York To learn more about Aseptico products, including the Penguin RFA unit, visit booth No. 3627. types, we embedded the different implant types in a dense material in an identical way. In addition, we gave all implants an identical outer geom- etry by molding each implant type into identical cylinders. The stability of each implant/cylinder can then be varied with a clamping device in a standardized manner. This also gave us the possibility to calibrate the pegs over the full ISQ scale and not only for a single value. How do you use this calibration method? With the method described above, a reference ISQ/stability relationship has been established, which is used when manufacturing MulTipegs for different implant designs. Each type of MulTipeg is designed to follow the standard ISQ/stability curve to assure that different types of implants show the same ISQ value or the same stability. It is also an excel- lent method to assure that the peg has an optimal fit to the implant. 5 Penguin RFA measures implant stability and osseo- integration to enhance decisions about when to load. (Photos/ Provided by Aspetico) So how did you solve this problem? Studies have shown that bone density at the implant site determines the ISQ value and that it correlates with the implant’s micro-mobility. This reflects the clamping ability of the bone, which in turn defines the micro- mobility. The problem is that different implant designs behave differently also in the same bone density, depend- ing on surgical technique, design and self-tapping properties. So when calibrating pegs for different implant Why is the above important? RFA is a great clinical tool, however, it is absolutely necessary that the technique is accurate, reliable and is based on a standard reference so that the stability of different implant types can be compared. This is par- ticularly important if the academic and scientific community is going to agree on different clinical protocols based on ISQ values, for instance, when it is safe to apply immediate/ early loading protocols. The Dentatus Profin system simplifies shaping Offering safe and precise contouring, finishing and polishing of hard-to-access surfaces By Dentatus Staff n The Profin Reciprocating System is the instrument of choice for shaping and finishing hard-to-access surfaces. emphasizes esthetics and shaping restorations to consistent clinical standards of form and function. Modern dentistry With Profin, a variety of safe-sided diamond-coated Lamineer® Tips, used in a 1.2 mm linear reciprocating motion, can fit into areas without Here in New York: A daily giveaway Daily at the Greater New York Dental Meeting at 10 a.m., 2 p.m. and 4 p.m., the first three dentists to visit Dentatus’ booth, No. 1714, will get a Profin By Hand Starter Kit. 5 (Graphic/Provided by Dentatus) ditching or damaging adjacent sur- faces, according to Dentatus. Depending upon the color-coded grit chosen, the tips are designed to facilitate gross reduction, shap- ing, finishing or polishing in hard-to- access areas. Tips can either rotate freely to follow natural contours or be fixed for controlled detailing and shaping of all restorative materials: enamel, dentin, cementum, compos- ite, porcelain, ceramics, amalgam and metals When used in place of finishing strips, in the free-floating mode, the tips provide delicate control to shape and polish both the curved and flat surfaces to optimize esthetic form in the gingival, interproximal, facial and incisal areas. The many benefits and features include: • Anatomical shaping for esthet- ics and function — interproximals, contacts, overhangs, embrasures and occlusal adjustment. • Tooth preparation for inlays, onlays and crowns — crisper and sharper shoulders, chamfers, inlays ad margins. • CAD/CAM — prepare and refine vertical walls, boxes, margins. • Interproximal reduction for orthodontic treatment and safe removal of residual ortho and luting cements. • Periodontics — root planning, debridement, scaling.