Author: Dr. Andréia Luiza Gabriel
Because it is necessary to test the color of the cement.
The cementation guarantees the union of the prosthetic parts to the dental structure with minimal or no preparation of the dental substrate. Cementation agents are important elements for completing the color of the installed pieces. The use of a cement capable of maintaining the color and translucency initially planned is of paramount importance to preserve the esthetic achieved. Studies reveal a greater chromatic stability in the long term of photoactivated cements, as they do not suffer the oxidation of chemical agents present in the dual mode. Over time there is a tendency for dual resin cements to become more yellowish. With less thickness, this color change can influence the final color, causing discomfort and consequent patient dissatisfaction with the treatment.
Photoactivated cement does not contain tertiary amine, responsible for the color change of the cement after aging. This factor interferes with the longevity of thin pieces because any change in the color of the cement will appear in the piece, thus compromising the final result. In addition, the thickness of the veneers does not interfere with the passage of light from the photoactivator, therefore, these materials polymerize properly in this clinical situation.
It is worth mentioning the use of Try-In pastes before cementation, as they allow the professional to test the color of the cement when testing the veneer. This type of procedure before cementation avoids one of the most frequent errors, which is the color difference between the ceramic and the dental substrate.
Photos kindly provided by Prof. Dr. Carlos Francci.
Adequate planning, associated with color testing and the choice of cement are crucial factors for an esthetic and harmonious result.