Adhesive improvement of the mechanical properties of a dense HA-cemented Ti dental implant.
We have been using dense, pure hydroxyapatite (HA) dental implants for the last 15 years and results have shown that dense HA is a chemically stable material with acceptable mechanical properties. However, due to HA's physical characteristics, particularly its brittleness, there is the risk that the implant will fail if the subsequent bone binding comprises less than one half of the root portion. To ensure greater implant success, a new cementing method has been developed that uses methacrylates for the bonding of the dense HA outer shell to the titanium (Ti) inner cylinder in a two-piece HA-cemented Ti implant. Mechanical property tests were conducted to compare the HA-cemented Ti implant bonded with this new acrylic cement with existing commercially available HA-cemented Ti implants bonded with a triethyleneglycol dimethacrylate (TEGDMA)-bisphenol-A diglycidyl ether (BisGMA compound). The vertical and horizontal compressive strength of this improved implant was respectively 3.4 and 6.1 times greater than the commercial implants. This increased strength of new acrylic cement is due to its ability to compensate for shrinkage that affects adhesion during curing, thereby providing stronger bonding.
Ogiso
M
M
Department of Fixed Prosthodontics, Tokyo Medical and Dental University, Japan.
Nakabayashi
N
N
Matsumoto
T
T
Yamamura
M
M
Lee
R R
RR
D000268:Adhesiveness; D003738:Dental Cements; D015921:Dental Implants; D006245:Hardness Tests; D006801:Humans; D006882:Hydroxyapatites; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014025:Titanium
D003738:Dental Cements; D015921:Dental Implants; D006882:Hydroxyapatites; D014025:Titanium