The bonded phosphate groups then deplete the number of available bonding sites, resulting in weaker bonds. These phosphate groups are contained in saliva, and actively bond with external surfaces (such as the intaglio of restorations, like crowns). Flucke refers to are called phospholipids. “Eliminating those contaminants goes a long way to having a great long-term restoration.” “Saliva has a lot of components in it that can stick to the inside of crowns and interfere with bond strengths,” Dr. “And contamination was determined to be detrimental to the resin cement-to-porcelain bond.” Ultimately, the study found that this detrimental contamination during try-in weakened bonds by over 60 percent. “Contamination of the fitting surfaces of porcelain veneers with saliva at the try-in stage is almost inevitable,” the study states. One University of Bristol study examining the effects of saliva on resin cement-bonded porcelain surfaces found that salivary contamination in porcelain veneers greatly reduced bond strength between the porcelain and the cement.
![intaglio surface intaglio surface](https://www.researchgate.net/profile/Suha-Turkaslan/publication/38094220/figure/fig1/AS:307385911529520@1450297920967/The-intaglio-surface-of-porcelain-veneers-which-are-ready-for-cementation_Q640.jpg)
Research has shown this can create big complications. Saliva coats the nooks and crannies of everything-including the inside surface of prosthetic restorations during intraoral try-in. Unfortunately for dentists, the mouth actively works against keeping surfaces dry and contaminant-free. “But cleaning can make such a difference.” John Flucke, DPR’s technology editor who practices in Lee’s Summit, Mo. “Contamination when trying in permanent prostheses can truly be a problem,” says Dr. And no matter how sparkling clean the intaglio is before try-in, as soon as a crown is placed in the mouth, it’s going to be dirty or contaminated.
INTAGLIO SURFACE FULL
“It’s all about isolation avoiding contamination in the field leads to a strong bond that hopefully lengthens the life of the restoration.”īut what about the other side of things? It doesn’t matter how clean the tooth is if the intaglio (inside surface) of prosthetic restorations is full of contaminants. Jennifer Sanders, a general dentist in private practice in Frenchtown, Mont. “It’s obviously so important to get a good bond,” says Dr. Thirsty or Isolite all help ensure the tooth’s bonding sites remain clean, dry, and ready for bonding. Having an unclean or contaminated bonding surface can jeopardize the bond strength between a restoration and the tooth, which can ultimately lead to adhesion issues, debonding and overall restoration failure.Īs a result, much consideration is given to ensuring that the field and the tooth itself are properly cleaned and decontaminated-rubber dams, cotton, or isolation tools like Mr. It’s no secret that contamination can be a major contributing factor to restoration failure.