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The diagnostic template: a key element to the comprehensive esthetic treatment concept.

Provisional restorations represent a key element in the realization of extensive esthetic rehabilitations. In particular, they provide indispensible diagnostic information contribute significantly to adjacent soft tissue conditioning, and ensure the patient's comfort during the intermediate phase of treatment. The-treatment outcome strongly depends on the treatment approach chosen. This article describes a treatment rationale comprising the use of a diagnostic template. This type of work strategy, documented with clinical cases, integrates diagnostic waxups and indirect provisional restorations using simplified and efficient fabrication techniques.

Dental Impression Technique↗

Life on the arc: principle-centered comprehensive care.

Today's dental practice is experiencing an evolution in the manner through which new materials and techniques are marketed and introduced. An increasing concern among the patient population regarding aesthetics contributes to the acceptance of a commodity dental philosophy, without questioning the reliability of the technique or new material. A principle-centered practice differentiates the product marketing from the viability of a restorative material in vivo. This article discusses the concept of a principle-centered practice and describes how to place quality products in a balanced system in which harmony exits between all components of the masticatory system: the teeth, the muscles, and the temporomandibular joints.

Comprehensive Dental Care↗

Restoration of the severely worn dentition using a systematized approach for a predictable prognosis.

Dental literature supports the concept that vertical dimension of occlusion is normally not lost in severely worn dentition, and the bite should generally not be opened to facilitate dental reconstruction. However, restoration of a periodontally sound but severely worn dentition, at existing vertical dimension, frequently presents unique challenges in patient management, diagnosis, treatment planning, and restorative methodology. This report reviews and demonstrates an integrated and planned approach to this complex treatment situation that can lead to a favorable and predictable prognosis. The approach also allows a practitioner free use of various techniques if certain goals of occlusion are followed.

Crowns↗

Reduction copings.

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Dental Abutments↗

Cutting on triangle mesh: local model-based haptic display for dental preparation surgery simulation.

A new method to realize stable and realistic cutting simulation using an impedance display haptic device and microcomputer is presented in this paper. Material removal or cutting simulation is a critical task in dental preparation surgery simulation. In this paper, a piecewise contact force model is proposed to approximately describe the cutting process. Challenging issues of minimizing the difference between the cutting simulation and haptic contact simulation are analyzed. The proposed contact-based simulation method is developed for a one-dimensional cutting task and can be expanded to three-dimensional cases. Local model-based multirate simulation cutting architecture is proposed and force control of the haptic device is decoupled from the cutting simulation loop, which can both ensure high fidelity of dynamical simulation as well as maintain stability of the haptic device. The cutting operation is realized using spherical and cylindrical shaped tools. An experiment based on the Phantom desktop proves that fidelity in one-dimensional cutting can be realized and stability in three-dimensional cutting can be ensured using the force-filtering method.

Computer Simulation↗

Three-dimensional acquisition and visualization of dental arch features from optically digitized models.

A method for the acquisition and evaluation of 3D coordinates from anatomically oriented plaster casts is presented, which is based on optical phase shifting profilometry (a fringe projection technique). With the computer-controlled setup, measurements from different views can be combined to obtain a complete three dimensional reconstruction of the model surface. To allow faster evaluation, the result is converted into a range image. From this digital data set the characteristic features like cusp tips can be identified and located semi-automatically. Based on these marks, quantitative values for differences between situation models like local displacements, e.g. during orthodontic treatment, can be determined. The results are visualized as interactively controllable 3D computer graphics, which helps to make spatial relations clearer.

Calibration↗

1.4 Research and the dental student.

There has been significant concern that the dental curriculum and system of clinical education, in particular, is not designed to take advantage of the explosion in knowledge in biomedical science and its application to the health of the public. Although there are some examples of innovations in dental education on a global scale that have the capacity to increase the assimilation of basic and clinical knowledge, most of the dental education models are mired in the traditional '2 + 2' approach to education. This can be seen in North America and the European '2 + 3' model or the stomatological '4 + 2' approach. In each of these systems, the basic and behavioural science courses continue to be perceived as hurdles over which students must leap in order to reach the clinical programmes where there is little opportunity to use basic science information to advance patient care and treatment. Examples of issues that are not well represented include: innovations in imaging; diagnosis; bio-materials; science-based approaches to clinical practice; novel approaches to therapeutics; interactions between the oral, dental and craniofacial complex and systemic health and disorders; the role of oral infections and systemic disease; the increasing appreciation of chronic diseases and disorders such as osteoporosis and diabetes that affect oral tissues; the promise of bioengineering, tissue engineering and biomimetics; the potential use of saliva as a diagnostic tool; the understanding of oral complications of cancer treatment; the treatments of HIV/AIDS diseases and hepatitis; the use of dental and dental hygiene staff on health-care teams to deal with issues such as birth defects, orofacial trauma, head and neck cancer, chronic pain management and so on. There seems to be an excessive emphasis on restorative dentistry and, to a lesser extent, on the more biological approaches to diagnosis, prevention and therapeutics. This continued lack of integration of basic and clinical sciences in the curriculum continues to foster a dental workforce that is highly technically competent to provide specific clinical services but poorly equipped to evaluate and implement new biological approaches to diagnosis, therapeutics and intervention. Unfortunately, after many attempts by organized dental symposia aimed at the integration of basic and clinical sciences, there has been little discernible curricular change. It appears that there is an opportunity through this global congress to identify the best practices in the various global curricula that could change this paradigm in dental education and lead us toward the education of a more scientifically orientated practitioner-one who can take advantage of innovations in new and emerging technologies in their application to patient care. It is the challenge of this section to try to ascertain the best method or methods by which dental education promotes research to the dental student and what research represents in terms of critical thinking and evidence-based approaches to dental education and clinical practice.

Competency-Based Education↗

Log-linear model selections in a rural dental health study.

This field study sought to measure the effects of dental delivery and school-based, dental health education on use of dental health care by children in grades K-6. We attempted to control for two potential confounding factors by an approximate randomization of children into treatment groups with stratification on grade and initial oral disease levels. A backward elimination log-linear model selection procedure for the 5-factor classification permitted tests for higher-order interaction, namely effect-modification, confounding and collapsibility. We found that the effect of dental health education on use of dental care depended on the mode of dental delivery.

Child↗

A model of temperature transients in dental implants.

Dental implants provide a continuous interface between the oral environment and the deep core structures of the jaws. Implants and trans-mucosal superstructures are primarily metal and heat conduction occurs readily. A hypothetical heat conduction model is investigated to determine the ranges of temperature gradients that might occur in implants. This model showed that a 60 degrees C heat source will cause a heat front of > or = 47 degrees C to advance > 3 mm down an implant within one second. Oral temperature transients may be a factor in implant pathology.

Dental Implants↗