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DTSTART;TZID=Australia/Adelaide:20261026T183000
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DTSTAMP:20261022T043812Z
CREATED:20261019T002559Z
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UID:16989-1793039400-1793044800@sa.aos.org.au
SUMMARY:THE ACCURACY OF DIGITAL IMPRESSIONS (Webinar)
DESCRIPTION:THE ACCURACY OF DIGITAL IMPRESSIONS \nIntra-oral scanners offer a compelling alternative to conventional impressions\, but accuracy declines with larger spans and complex geometries. Stitching errors and patient movement introduce distortion. Participants will identify key sources of distortion and understand their clinical implications for implant and prosthetic outcomes. \n \n\n\n\n\n\n\n\n\n\n\n\nTHE ACCURACY OF DIGITAL IMPRESSIONS \nThe Quest for Zero Defect \nDistortion\, Digital Accuracy and the Pursuit of Passive Fit in Implant Prosthodontics \nThe pursuit of passive fit has been a fundamental principle of implant prosthodontics since the introduction of osseointegrated implant-supported reconstructions. Unlike natural teeth\, osseointegrated implants lack the periodontal ligament’s capacity to accommodate displacement\, raising important questions about the mechanical and biological consequences of inaccuracies within rigid\, screw-retained prosthetic frameworks. \nDespite substantial advances in impression materials\, computer-aided design and manufacturing\, intraoral scanning and photogrammetry\, the accurate three-dimensional reproduction of multiple implant positions remains challenging. Every stage of the restorative workflow introduces potential distortion\, from conventional impression materials and master casts to digital image acquisition\, scan stitching\, data processing and prosthetic manufacture. \nDrawing on a contemporary review of the literature and recent comparative research examining analogue impressions\, seven intraoral scanners and four photogrammetry systems\, this presentation will critically evaluate the accuracy\, trueness and precision of current techniques for recording complete-arch implant positions. \nParticular attention will be given to the cumulative effects of linear and angular inaccuracies\, the limitations of conventional intraoral scanning across edentulous arches\, and the potential advantages of extraoral and intraoral photogrammetry. \nThe presentation will also challenge the assumption that absolute passive fit is clinically achievable or that a universally acceptable misfit threshold has been established. The biomechanical consequences of framework distortion\, the limitations of clinical fit assessment and the evidence linking misfit to prosthetic and biological complications will be examined. \nUltimately\, the quest for zero defect is not simply a pursuit of increasingly accurate technology\, but an understanding of how errors arise\, accumulate and can be controlled to produce predictable\, mechanically reliable implant-supported prostheses. \nLearning Outcomes: \n\nExplain the biomechanical principles of passive fit\nIdentify and evaluate sources of distortion\nCritically compare the accuracy of contemporary implant-position recording techniques.\nAppraise the scientific evidence relating to distortion and prosthetic misfit.\nApply evidence-based strategies to minimise and verify distortion\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nAbout Associate Professor Dale G. Howes\nSpecialist Prosthodontist at University of Sydney\nAssociate Professor Dale Howes is a specialist prosthodontist and Course Director of the Doctor of Clinical Dentistry (Prosthodontics) program at the University of Sydney. He is a former President of the International College of Prosthodontists as well as the International Society for Maxillofacial Rehabilitation. He has extensive experience in implant prosthodontics\, complex oral rehabilitation and maxillofacial prosthetics.\nHis clinical practice includes the management of complex implant-supported reconstructions and the prosthetic rehabilitation of patients following head and neck cancer treatment\, working within multidisciplinary teams at Chris O’Brien Lifehouse and public dental teaching hospitals in Sydney.\nHis research interests include implant design and biomechanics\, prosthetic accuracy\, implant angulation correction\, digital workflows and the long-term mechanical performance of implant-supported prostheses. He has contributed to the development of innovative implant systems and prosthodontic techniques\, including the Co-Axis and Zygomatic implant concept.\nHe is actively involved in postgraduate education\, clinical research and international professional education\, with a particular interest in translating engineering principles and emerging technologies into predictable clinical outcomes.
URL:https://sa.aos.org.au/event/the-accuracy-of-digital-impressionswebinar/
LOCATION:Online event
CATEGORIES:Member,Non-member
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