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Special Issues
July/August 2017
Volume 38, Issue 2

“Smart” Materials: Bioactivity in Crown-and-Bridge Cements

Lou Graham, DDS

“Biomineralization” refers to the exchange of calcium and phosphate ions with the tooth substance, forming new apatite or, in many cases, repairing existing demineralized apatite. Regarding dental cements, this type of bioactivity can lead to precipitation of apatite crystals on the surface of the cement in the presence of moisture (saliva). Preliminary evidence shows that this action can seal gaps in margins between restorative materials and tooth structure, which can be a tremendous benefit for a luting cement. A clinically “closed” crown margin is considered to be from 30 µm to 50 µm, where a sharp dental explorer cannot “feel” a perceptible “click.” Ceramir® Crown & Bridge (Doxa Dental Inc., is a bioactive luting agent that is not only insoluble in oral fluids, but has been shown to occlude artificial marginal gaps between restorative materials and the tooth. Also, by virtue of the availability of calcium and phosphate ions, in the presence of saliva the luting agent precipitates apatite crystals on its surface to further protect and seal the marginal area.

Key Takeaways

• Bioactivity is expanding in the dental profession by virtue of the many new “smart” materials emerging in the marketplace.

• With a set end pH of 8.4, Ceramir Crown & Bridge can buffer the effects from acid by-products in the crevicular environment, leading to a higher level of tissue biocompatibility.

• Ceramir Crown & Bridge dental luting cement is radio-opaque, biocompatible, and virtually sensitive-free when being placed.

About the Author

Lou Graham, DDS
Private Practice
University Dental Professionals
Chicago, Illinois

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