LSU DENTAL COBRE: DEVELOPMENT OF NEW ADHESIVE FLOURIDE-RELEASING MONOMERS

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This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Introduction: Recurrent caries is the most frequent cause for the failure of dental restorations. Fluoride-releasing restorative materials can reduce recurrent caries at the restoration margins. However, current dental composites and compomers have low fluoride release and recharge capabilities and they require bonding agents to bond to the tooth structure. Current dental bonding agents also have little fluoride-releasing and recharging capabilities and form a barrier hindering the transport of fluoride. Sealants have been used to fill the pits and fissures in posterior teeth but current sealants either release little fluoride or have poor adhesion. The goal of this project is to develop new fluoride-releasing dental bonding adhesives and sealants. We hypothesize that new fluoride-releasing dental bonding adhesives and sealants will release fluoride directly into the tooth structure, improve bonding, and facilitate the transport of fluoride from fluoride-releasing compomers and composites or topic fluoride agents to the tooth structure due to the fluoride?exchange capability. Therefore, they can significantly reduce the recurrent caries and prolong the life of the restoration. The following is the progress in year1. Objective: To synthesize new adhesive chelating monomers and F-exchange chelates. To be trained to become independent researcher and to obtain a R01 grant. Methods: Worked with the mentoring team, attended the COBRE training program, set up a new laboratory, hired and trained research associates. Results: Four new adhesive chelating monomers have been successfully synthesized. These monomers can form stable ternary metal fluoride (F-exchange) chelates that are soluble in mixed water?organic solvents. Three of the monomers may be used in self-etching primer (bonding agents) due to their high acidity, and one of them may be used in adhesives and sealants due to its high fluoride-exchange capability. Discussion: These preliminary results have laid an important foundation for the next year?s study and the future R01 application.