Related Experiment Video
Updated: Aug 10, 2026
08:01
Designing CAD/CAM Surgical Guides for Maxillary Reconstruction Using an In-house Approach
Published on: August 24, 2018
[CAD/CAM-copings for partial coverage]
H W Denissen1, J M van der Zel, M A van Waas
1Afdeling Orale Functieleer, Academisch Centrum Tandheelkunde Amsterdam (ACTA), Louwesweg 1, 1066 EA Amsterdam.
Nederlands Tijdschrift Voor Tandheelkunde
|April 5, 2002
Summary
Computer Integrated Ceramic Reconstruction (CICERO) and Ceramic Reconstruction (CEREC) systems produced all-ceramic copings for partial coverage. While marginal gaps were larger than cast metal, these computer-aided systems show potential for accurate dental restorations.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Computer-Aided Design/Manufacturing (CAD/CAM) in Dentistry
Background:
- All-ceramic restorations are increasingly used for partial coverage due to esthetics.
- Evaluating the accuracy of CAD/CAM systems for fabricating these restorations is crucial for clinical success.
Purpose of the Study:
- To assess the marginal gap accuracy of Computer Integrated Ceramic Reconstruction (CICERO) and Ceramic Reconstruction (CEREC) systems.
- To compare the accuracy of computer-generated ceramic copings with conventional cast metal restorations.
Main Methods:
- Posterior teeth were prepared, and stone dies were fabricated.
- All-ceramic copings were produced using CICERO and CEREC systems.
- Marginal gap analysis was performed and compared to cast metal control restorations.
Main Results:
- CICERO premolar copings had a mean marginal gap of 69 microns; CEREC copings averaged 81 microns.
- Molar copings showed mean marginal gaps of 78 microns (CICERO) and 89 microns (CEREC).
- Control cast metal restorations exhibited smaller marginal gaps (33-49 microns).
Conclusions:
- Computer-aided systems (CICERO and CEREC) can produce all-ceramic copings for partial coverage with mean marginal gaps of 74 and 85 microns, respectively.
- These initial results indicate the potential of CAD/CAM for fabricating accurate dental restorations.
- Further optimization, such as porcelain veneering, may improve marginal fit before clinical application.
Related Concept Videos
01:25Coplanar Forces
Consider an object upon which multiple forces are acting. If the lines of action of each force lie within the same plane, the system can be considered coplanar. The Cartesian vector form can be used to resolve each force into its respective components. For a coplanar system, the system will be in equilibrium if each component of the resultant force equals zero and the resultant force on the system is zero. If the sum of the forces is not equal to zero, then the object will not be in equilibrium...
01:16Design of Transmission Shafts
The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
01:23Design of Prismatic Beams for Bending
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...
01:16Eccentric Loading
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under load.
01:18Composite Masonry Walls
Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
01:12Taping Over Different Ground Profiles
Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...