Ying Chen1, Zhicen Lu1, Mengke Qian1, Huaiqin Zhang1, Chen Chen2, Haifeng Xie3, Franklin R Tay4. 1. Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, China; Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China. 2. Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, China; Department of Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China. 3. Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, China; Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China. Electronic address: xhf-1980@126.com. 4. Department of Endodontics, The Dental College of Georgia, Augusta University, Augusta, GA, 30912, USA. Electronic address: tayfranklin7@gmail.com.
Abstract
OBJECTIVES: To examine whether solvents and changing the molecular structure of 10-Methacryloyloxydecyl dihydrogen phosphate (10-MDP) affect its chemical affinity to Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP). METHODS: The present work investigated the chemical affinity between Y-TZP and 10-MDP dissolved in different solvents (acetone/ethanol/water or mixture) using X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and thermodynamic calculations. Shear bond strength (SBS) tests were used to evaluate the influence of different solvents on 10-MDP bonding. In addition, several phosphate ester monomer variants were created by changing the 10-MDP molecular structure. Changes included extending/shortening the spacer chain-length, and installing hydroxyl or carboxyl groups as side chains at different positions along the spacer chain. The thermodynamic parameters of the complexes formed between the 10-MDP variants and tetragonal zirconia were evaluated. RESULTS: The acquired data indicated that solvent is necessary for the formation of Zr-O-P bonds between 10-MDP and Y-TZP. Solvents affected the chemical affinity of 10-MDP to Y-TZP; acetone facilitated the best bonding, followed by ethanol. Changing the molecular structure of 10-MDP affected its chemical affinity to Y-TZP. The variants 15-MPDP, 12-MDDP, 6-hydroxyl-10-MDP and 6-carboxy-10-MDP all exhibited higher thermodynamic stability than 10-MDP when coordinated with tetragonal zirconia. In contrast, 2-MEP, 5-MPP, 10-hydroxyl-MDP, 10-carboxy-MDP, 5,6-dihydroxyl-10-MDP and 5,6-dicarboxy-10-MDP exhibited lower thermodynamic stability. SIGNIFICANCE: 10-MDP coordinates with zirconia through dissociating in solvents. Changing the molecular structure of 10-MDP theoretically affects its chemical affinity to Y-TZP.
OBJECTIVES: To examine whether solvents and changing the molecular structure of 10-Methacryloyloxydecyl dihydrogen phosphate (10-MDP) affect its chemical affinity to Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP). METHODS: The present work investigated the chemical affinity between Y-TZP and 10-MDP dissolved in different solvents (acetone/ethanol/water or mixture) using X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and thermodynamic calculations. Shear bond strength (SBS) tests were used to evaluate the influence of different solvents on 10-MDP bonding. In addition, several phosphate ester monomer variants were created by changing the 10-MDP molecular structure. Changes included extending/shortening the spacer chain-length, and installing hydroxyl or carboxyl groups as side chains at different positions along the spacer chain. The thermodynamic parameters of the complexes formed between the 10-MDP variants and tetragonal zirconia were evaluated. RESULTS: The acquired data indicated that solvent is necessary for the formation of Zr-O-P bonds between 10-MDP and Y-TZP. Solvents affected the chemical affinity of 10-MDP to Y-TZP; acetone facilitated the best bonding, followed by ethanol. Changing the molecular structure of 10-MDP affected its chemical affinity to Y-TZP. The variants 15-MPDP, 12-MDDP, 6-hydroxyl-10-MDP and 6-carboxy-10-MDP all exhibited higher thermodynamic stability than 10-MDP when coordinated with tetragonal zirconia. In contrast, 2-MEP, 5-MPP, 10-hydroxyl-MDP, 10-carboxy-MDP, 5,6-dihydroxyl-10-MDP and 5,6-dicarboxy-10-MDP exhibited lower thermodynamic stability. SIGNIFICANCE: 10-MDP coordinates with zirconia through dissociating in solvents. Changing the molecular structure of 10-MDP theoretically affects its chemical affinity to Y-TZP.
Authors: Francisco da Silva Araújo Milagres; Dauro Douglas Oliveira; Giordani Santos Silveira; Emanuelle de Fátima Ferreira Oliveira; Alberto Nogueira da Gama Antunes Journal: Materials (Basel) Date: 2019-11-27 Impact factor: 3.623