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Præparation


 

Preperation Guidelines

 

Succesful results can only be achieved with IPS e.max CAD if the guidelines and framework thickness are strictly observed.

 

Basic preparation guidelines for all-ceramic restorations

- no angles or sharp edges.

- shoulder preparation with rounded inner edges and/or chamfer preparation.

- the indicated dimensions reflect the minimum thickness for IPS e.max CAD restorations

- the incisal edge of the preparation, particularly for anterior teeth, should be at least 1.0 mm (milling tool geometry) in order to permit optimum during CAD/CAM processing.

 

 

 

Veneer

Anterior crown

- If possible, the preparation should be located in the enamel.

- The incisal preparation margins should not be located in the area of static or dynamic enamel contact.

- Reduction in the cervical and/or labial area by 0.6 mm, and the incisal edge by 0.7 mm.

- Reduce the anatomical shape and observe the stipulated minimum thickness. Prepare a shoulder with rounded inner edges or a deep chamfer. Width of the shoulder/chamfer at least 1.0 mm.

- Reduce the edge by approx. 1.5 mm.

- Reduce the labial and lingual area by approx. 1.2 mm.

- For conventional and/or self-adhessive cementation, the preparation must demonstrate retentive surfaces.

 

 

 

 

 

Inlay

Onlay

- Static and dynamic antagonist contacts must be taken into consideration.

- The preparation margins must not be located on centric antagonist contacts.

- A preparation depth of at least 1.0 mm and an isthmus width of at least 1.0 mm must be observed in the fissue area.

- Prepare the proximal box with slightly diverging walls and observe an angle of 100°-120° between the proximal cavity walls and the prospective proximal inlay surfaces. For inlays with pronounced convex cavity walls without adequate support by the proximal shoulder, marginal ridge contacts should be avoided.

- Round out internal edges in order to prevent stress concentration within the ceramic material.

- Do not prepare slice-cuts or feather edges.

- Static and dynamic antagonist contacts must be taken into consideration.

- The preparation margins must not be located on centric antagonist contacts.

- A preparation depth of at least 1.0 mm and an isthmus width of at least 1.0 mm must be observed in the fissure area.

- Prepare the proximal box with slightly diverging walls and observe an angle of 100°-120° between the proximal cavity walls and the prospective proximal shoulder, marginal ridge contacts should be avoided.

- Round out internal edges in order to prevent stress concentration within the ceramic material.

- Do not prepare slice-cuts or feather edges.

- Provide at least 1.0 mm of reduction in the cusp areas.

 

 

 

 

 

Partial crown

Posterior crown

- Static and dynamic antagonist contacts must be taken into consideration.

- The preparation margins must not be located on centric antagonist contacts.

- Provide at least 1.5 mm of reduction in the cusp areas.

- Prepare a circular shoulder with rounded inner edges or a deep chamfer. Width of the shoulder/chamfer should be at least 1.0 mm.

- Reduce the anatomical shape and observe the stipulated minimum thickness. Prepare a circular shoulder with rounded inner edges or a deep chamfer. Width of the shoulder/chamfer at least 1.0 mm.

- Reduce the incisal crown third by approx. 1.5 mm.

- Reduce the buccal or lingual area by approx. 1.5 mm.

- For conventional and/or self-adhesive cementation, the preparation must demonstrate retentive surfaces.

 

 

 

 

 

 

Damhus Boulevard 24 - 2610 Rødovre - Tlf: +45 36 70 18 05 - E-mail: kontakt@bruunsdental.dk

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