A 2-part facebow for CAD-CAM dentistry

Lam, Walter Yu Hang; Hsung, Tai-Chiu; Choi, Winnie W.S.; Luk, Henry W.K.; Pow, Ehn

doi:10.1016/j.prosdent.2016.05.013

Cited by 61 publications

(61 citation statements)

References 11 publications

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“…Another important element in the surgical implant virtual patient approach is the virtual articulator, which is used to simulate the dynamics of the patient’s jaw movement during chewing, swallowing, breathing, bruxing and speech. Several techniques are currently available to virtually mount the upper cast in the correct coordinate system with reference to the skull base using the kinematic or hinge axis of the temporomandibular joint (TMJ) as a neutral zero position [ 47 , 48 ]. An important requirement here is the Euclidean dimensional correspondence between the starting point of the jaw motion tracing device and the virtual articulator.…”

Section: Resultsmentioning

confidence: 99%

Cone beam computed tomography in implant dentistry: recommendations for clinical use

et al. 2018

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BackgroundIn implant dentistry, three-dimensional (3D) imaging can be realised by dental cone beam computed tomography (CBCT), offering volumetric data on jaw bones and teeth with relatively low radiation doses and costs. The latter may explain why the market has been steadily growing since the first dental CBCT system appeared two decades ago. More than 85 different CBCT devices are currently available and this exponential growth has created a gap between scientific evidence and existing CBCT machines. Indeed, research for one CBCT machine cannot be automatically applied to other systems.MethodsSupported by a narrative review, recommendations for justified and optimized CBCT imaging in oral implant dentistry are provided.ResultsThe huge range in dose and diagnostic image quality requires further optimization and justification prior to clinical use. Yet, indications in implant dentistry may go beyond diagnostics. In fact, the inherent 3D datasets may further allow surgical planning and transfer to surgery via 3D printing or navigation. Nonetheless, effective radiation doses of distinct dental CBCT machines and protocols may largely vary with equivalent doses ranging between 2 to 200 panoramic radiographs, even for similar indications. Likewise, such variation is also noticed for diagnostic image quality, which reveals a massive variability amongst CBCT technologies and exposure protocols. For anatomical model making, the so-called segmentation accuracy may reach up to 200 μm, but considering wide variations in machine performance, larger inaccuracies may apply. This also holds true for linear measures, with accuracies of 200 μm being feasible, while sometimes fivefold inaccuracy levels may be reached. Diagnostic image quality may also be dramatically hampered by patient factors, such as motion and metal artefacts. Apart from radiodiagnostic possibilities, CBCT may offer a huge therapeutic potential, related to surgical guides and further prosthetic rehabilitation. Those additional opportunities may surely clarify part of the success of using CBCT for presurgical implant planning and its transfer to surgery and prosthetic solutions.ConclusionsHence, dental CBCT could be justified for presurgical diagnosis, preoperative planning and peroperative transfer for oral implant rehabilitation, whilst striving for optimisation of CBCT based machine-dependent, patient-specific and indication-oriented variables.

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Section: Resultsmentioning

confidence: 99%

Cone beam computed tomography in implant dentistry: recommendations for clinical use

et al. 2018

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“…In the conventional approach, the use of the facebow transfer and physically mounting the cast are mandatory. For programming a virtual articulator, several techniques have been proposed …”

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confidence: 99%

“…Solaberrieta et al used a “virtual facebow” to align the intraoral scan to the 3D face scan, and then oriented the digital maxillary model to a virtual articulator by matching the face landmarks . Other techniques, sharing a similar idea, also rely on the face scan . However, the face scanner and software are not readily available in most dental clinics and labs, making this approach hard to implement.…”

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confidence: 99%

A Full‐Digital Technique to Mount a Maxillary Arch Scan on a Virtual Articulator

Lepidi

Chen

Ravidà

et al. 2019

Journal of Prosthodontics

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Mounting casts accurately on an articulator is a prerequisite for the treatment planning/execution of complex dental cases that require occlusal rehabilitation. A full digital approach to transfer the position of maxillary dentition to a virtual articulator, by using intraoral scans and cone beam computed tomography (CBCT) files is presented. This technique offers reduced chairside time and the flexibility of choosing the orientation plane. It can be used in orthognathic surgeries, complex interdisciplinary treatments requiring a CBCT scan with a large field of view, or treatments that already have the head CT or CBCT scans from previous diagnosis/treatment.

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“…Digital alternatives to the conventional facebow have been proposed and studied with mixed results . Problems still exist relating patient‐specific data to the transverse axis and esthetic reference planes, and most do not address the edentulous arch or if no verifiable interocclusal position is present; however, there are few issues with relating the maxillary arch to the cranial base.…”

mentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17][18][19][20][21] Problems still exist relating patient-specific data to the transverse axis and esthetic reference planes, and most do not address the edentulous arch or if no verifiable interocclusal position is present; however, there are few issues with relating the maxillary arch to the cranial base. The axis can be located by stereophotogrammetry, 12 anatomic landmarks, 13 mathematical calculation of an instantaneous axis, 17 reverse engineering and collision avoidance, 20 or electronic jaw movement analyzers. 14,19 Alignment of the maxillary and mandibular virtual casts to the virtual articulator and simulation of mandibular movements is the ultimate goal.…”

mentioning

confidence: 99%