1.Effect of self-adhesive resin cement and tribochemical treatment on bond strength to zirconia.
Jie LIN ; Akikazu SHINYA ; Harunori GOMI ; Akiyoshi SHINYA
International Journal of Oral Science 2010;2(1):28-34
AIMTo evaluate the interactive effects of different self-adhesive resin cements and tribochemical treatment on bond strength to zirconia.
METHODOLOGYThe following self-adhesive resin cements for bonding two zirconia blocks were evaluated: Maxcem (MA), Smartcem (SM), Rely X Unicem Aplicap (UN), Breeze (BR), Biscem (BI), Set (SE), and Clearfil SA luting (CL). The specimens were grouped according to conditioning as follows: Group 1, polishing with 600 grit polishing paper; Group 2, silica coating with 110 microm Al2O3 particles which modified with silica; and, Group 3, tribochemical treatment--silica coating + silanization. Specimens were stored in distilled water at 37 degrees C for 24 hours before testing shear bond strength.
RESULTSSilica coating and tribochemical treatment significantly increased the bond strength of the MA, UN, BR, BI, SE and CL to zirconia compared to #600 polishing. For both #600 polished and silica coating treatments, MDP-containing self-adhesive resin cement CL had the highest bond strengths to zirconia.
CONCLUSIONApplying silica coating and tribochemical treatment improved the bond strength of self-adhesive resin cement to zirconia, especially for CL.
Aluminum Compounds ; chemistry ; Aluminum Oxide ; chemistry ; Bisphenol A-Glycidyl Methacrylate ; chemistry ; Composite Resins ; chemistry ; Dental Bonding ; methods ; Dental Etching ; methods ; Dental Materials ; chemistry ; Fluorides ; chemistry ; Humans ; Materials Testing ; Methacrylates ; chemistry ; Microscopy, Electron, Scanning ; Polyethylene Glycols ; chemistry ; Polymethacrylic Acids ; chemistry ; Polyurethanes ; chemistry ; Resin Cements ; chemistry ; Shear Strength ; Silanes ; chemistry ; Silicon Compounds ; chemistry ; Silicon Dioxide ; chemistry ; Stress, Mechanical ; Surface Properties ; Tricarboxylic Acids ; chemistry ; Zirconium ; chemistry
2.A Case of Aortic Regurgitation Accompanied by Multiple Metal Allergy Treated with Aortic Valve Replacement under Median Sternotomy
Shinya Takimoto ; Michiya Hanyu ; Yoshio Arai ; Atsushi Nagasawa ; Akiyoshi Mikuriya ; Takeichiro Nakane ; Hiroo Teranishi ; Shun Watanabe ; Takashi Tsuji
Japanese Journal of Cardiovascular Surgery 2013;42(6):466-470
A 58-year-old man who complained of dyspnea on effort was given a diagnosis of decompensated congestive heart failure. Echocardiography revealed severe aortic regurgitation and cardiomegaly. We decided to perform aortic valve replacement with a mechanical valve, however his past history made us suspicious of allergy to metal. From his previous patient records, we determined he was allergic to many metals : gold, iron, platinum, cobalt, chrome, bronze, and zinc. Newly performed skin patch tests showed positive reactions to aluminum, tin, palladium, indium, iridium and stainless steel. We selected a CarboMedics mechanical valve made of nickel-titanium alloy. Aortic valve replacement with a 27-mm CarboMedics mechanical valve was performed by median sternotomy. At sternum closure, we used polyester non-absorbable suture thread, instead of surgical steel wire, because it contains stainless steel. His postoperative progress was good and he was discharged on the 10th postoperative day. One year after surgery he is doing well without any allergic symptoms.