Influence of water immersion on the mechanical properties of fiber posts.
OBJECTIVE
The purpose of this study was to evaluate the influence of water immersion on the mechanical properties of three kinds of glass fiber posts and the fracture resistance of structures using resin composites with glass fiber posts.


METHODS
Each post was divided into three groups; a control group and two water immersion groups (30 and 90 days). Flexural strength was determined by three-point bending test. Each structure was divided into two groups; a control group and a water immersion group for 30 days. The fracture strength of structures was determined by a static loading test.


RESULTS
In the flexural strength, two kinds of post in water immersion groups showed lower values than control groups. In the fracture strength, two kinds of structures in water immersion group showed lower values than control groups.


CONCLUSIONS
The prefabricated glass fiber posts and structures using resin composites with glass fiber posts were affected by water immersion.
Fixed Prosthodontics, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: w.komada.fpro@tmd.ac.jp.
Wataru
W
Komada
Fixed Prosthodontics, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: t.inagaki.fpro@tmd.ac.jp.
Tasuku
T
Inagaki
Fixed Prosthodontics, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: y.ueda.fpro@tmd.ac.jp.
Yoji
Y
Ueda
Fixed Prosthodontics, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: s.omori.fpro@tmd.ac.jp.
Satoshi
S
Omori
Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: hosaka.ope@tmd.ac.jp.
Keiichi
K
Hosaka
Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: tagami.ope@tmd.ac.jp.
Junji
J
Tagami
Fixed Prosthodontics, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: h.miura.fpro@tmd.ac.jp.
Hiroyuki
H
Miura
D003188:Composite Resins; D003764:Dental Materials; D005898:Glass; D007101:Immersion; D008422:Materials Testing; D013314:Stress, Mechanical; D013718:Tensile Strength; D013997:Time Factors; D014867:Water
D003188:Composite Resins; D003764:Dental Materials; C009753:fiberglass; D014867:Water
Composite resin core; Fracture strength; Glass fiber posts; Water immersion