IADR Abstract Archives
HAXPES Analysis of Pretreated Ti Surfaces for Dental Implants
Objectives: Homogenous silane coatings on Ti are vital for adhesion. Hard X-ray Photoelectron Spectroscopy (HAXPES) was performed to study effects of silica-coating and acid-etching using novel dual-surface treatment on Ti-specimens. Non-destructive HAXPES accurately determines chemical states in silane coating and underlying interface to understand homogeneity, develop higher-quality Ti surfaces and durable adhesion for dental implants.
Methods: Eight c.p.-2 grade Ti-specimens (10-mm x 10-mm x 1-mm) were SiC-1000-paper-polished (PO) (Struers, Denmark) and then randomly divided into 4 study groups. Half of specimens were etched (AE) and other half silica-coated (SC) followed by acid-etching. Silica-coating was based on silica-coated alumina grits. Etching was done with blend of 69% HNO3 and 35% HCl for 2-min at 60 C. After rinsing and drying specimens they were silanized with experimental blend of 0.3wt.% 1,2-bis-(triethoxysilyl)ethane+1.0wt.% 3-acryloyloxypropyltrimethoxysilane (ES). Control silane was Monobond-Plus (Ivoclar-Vivadent), 3-methacrylatesilane (MB). Analysis of specimens was performed by synchrotron radiation excited HAXPES at KMC-1-beamline at Bessy-II (Helmholtz-Zentrum, Berlin, Germany).
Results: Spectroscopy of selected elements (Si, Al and Ti) and chemical states were performed to observe homogeneity and composition of the coating. Specimens PO-SC-ES suggested uneven silane films as Ti was detected at some parts of the sample. Specimens PO-AE-MB exhibited no Ti signals. Al was found in PO-SC and PO-SC-ES specimens whereas not in PO-SC-MB samples. Specimens PO-SC show most intensive Si signals followed by PO-SC-MB. Silanes didn’t coat evenly PO-AE surfaces. Surprisingly, silica-coating followed by acid-etching (PO-SC-AE) seems to favor formation of chemically bonded silane coatings. All silane films were bonded with Ti-O-Si links to silica-coated and etched Ti.
Conclusions: Acid-etching polished Ti is inadequate as pretreatment before silanization. Silica-coated Ti can be acid-etched as there will be still Si left for bonding with silane. This novel dual adhesion concept might be viable for durable bonding in implant dentistry.
Methods: Eight c.p.-2 grade Ti-specimens (10-mm x 10-mm x 1-mm) were SiC-1000-paper-polished (PO) (Struers, Denmark) and then randomly divided into 4 study groups. Half of specimens were etched (AE) and other half silica-coated (SC) followed by acid-etching. Silica-coating was based on silica-coated alumina grits. Etching was done with blend of 69% HNO3 and 35% HCl for 2-min at 60 C. After rinsing and drying specimens they were silanized with experimental blend of 0.3wt.% 1,2-bis-(triethoxysilyl)ethane+1.0wt.% 3-acryloyloxypropyltrimethoxysilane (ES). Control silane was Monobond-Plus (Ivoclar-Vivadent), 3-methacrylatesilane (MB). Analysis of specimens was performed by synchrotron radiation excited HAXPES at KMC-1-beamline at Bessy-II (Helmholtz-Zentrum, Berlin, Germany).
Results: Spectroscopy of selected elements (Si, Al and Ti) and chemical states were performed to observe homogeneity and composition of the coating. Specimens PO-SC-ES suggested uneven silane films as Ti was detected at some parts of the sample. Specimens PO-AE-MB exhibited no Ti signals. Al was found in PO-SC and PO-SC-ES specimens whereas not in PO-SC-MB samples. Specimens PO-SC show most intensive Si signals followed by PO-SC-MB. Silanes didn’t coat evenly PO-AE surfaces. Surprisingly, silica-coating followed by acid-etching (PO-SC-AE) seems to favor formation of chemically bonded silane coatings. All silane films were bonded with Ti-O-Si links to silica-coated and etched Ti.
Conclusions: Acid-etching polished Ti is inadequate as pretreatment before silanization. Silica-coated Ti can be acid-etched as there will be still Si left for bonding with silane. This novel dual adhesion concept might be viable for durable bonding in implant dentistry.