The first layer is the crown, in this case it is zirconia, which would already be polished, shaped and fitted for the patients mouth before it is cemented. The next layer is the intaglio surface, the interior area of the zirconia crown. Part of my research is finding the most accepted and successful method to prepare the intaglio because at the moment there are a variety of approaches. Next, there is an optional step, the intaglio primer, which is typically a substance with a phosphate group base that enhances bonding with the surrounding layers. After is the cement which is the main bonding factor of the restoration. As I explained in a previous post "Cement Types", there are different types of cements which can change whether or not an the next layer, an etch layer, exists. For example, if a self-etching resin cement is used, then there is no need to etch the surface again. The final surface is the prepared tooth, or natural tooth. There are several ways to prepare the natural tooth for a restoration, which is why I am also researching the best protocol for preparing the natural tooth.
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| Top layer: Zirconia crown Top blue layer: Intaglio surface Green layer: Intaglio primer Middle white layer: Cement Pink layer: Etch Bottom blue layer: Prepared tooth |
Do all the layers add strength to the bonds or do they all serve separate functions?
ReplyDeleteThe different layers add strength to the bond. For example the pink layer, or the etch, is an acid that forms microscopic divots in the natural tooth so that the wet cement can fill them and create a stronger bond between the natural tooth and the restoration.
DeleteIn your preliminary research what have you found? Is there a way that you seem to think is the most effective thus far?
ReplyDeleteHey Sydney! What is the benefit of the intaglio primer? In which cases would you apply it?
ReplyDeleteAn intaglio primer can enhance the strength of the overall bond. It is usually a phosphate based substance and applied when a composite resin cement is used.
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