CAD/CAM - international magazine of digital dentistry

_Abstract Inrecentyears,therehasbeenagrowinginterest in guided implantology. A digital work-up is cer- tainlyofgreatbenefitforclinicianstobetterunder- stand their patients’ bone morphology and density and consequently to plan implant positions cor- rectly, and to have their hands guided during im- plantplacementbymeansofasurgicalguide.There are many systems on the market today and many researchers have studied post-operative CT scans and planning scans by means of superimposition, in seeking to understand the secret to achieving perfect correspondence and the best system, but this perfect accuracy has not yet been found and there appears to be a mismatch between planning and the actual implant position. I have developed a device (Dental Implant Posi- tioning System, International PCT IT 2009 000192, WO2010/125593A1;patentpending)thatrespects the implant’s spiral movement in accordance with mathematicalcriteria.Thesamecriteriaarealsoim- portant in theorising limits and achieving accuracy using computer-guided implantology. _Introduction: Passive systems and the limits of the human visual, auditory and spatial resolution Is it possible, using one technique, among the many on the market, to create repeatable results in terms of a final prosthesis? How many of the presently marketed systems in guided implantol- ogyreallyarepassive?Dopassiveinfra-redsystems really facilitate repeatability? Human visual resolution limits do not allow for accuracy: eye, ear and fine hand movements have not yet crossed this threshold. Human spatial resolution can be evaluated with reference to the modulation transfer function (MTF). This is also I special _ guided implantology New concepts in computer-guided implantology Part II: Error analysis and accuracy verification Author_Dr Gian Luigi Telara, Italy 06 I CAD/CAM 2_2012 infra-red control resolution errors high contrast data-transfer accuracy technology