start-ver=1.4
cd-journal=joma
no-vol=12
cd-vols=
no-issue=12
article-no=
start-page=2947
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20201209
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Flexural Strength of Resin Core Build-Up Materials: Correlation to Root Dentin Shear Bond Strength and Pull-Out Force
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The aims of this study were to investigate the effects of root dentin shear bond strength and pull-out force of resin core build-up materials on flexural strength immediately after setting, after one-day water storage, and after 20,000 thermocycles. Eight core build-up and three luting materials were investigated, using 10 specimens (n = 10) per subgroup. At three time periods-immediately after setting, after one-day water storage, and after 20,000 thermocycles, shear bond strengths to root dentin and pull-out forces were measured. Flexural strengths were measured using a 3-point bending test. For all core build-up and luting materials, the mean data of flexural strength, shear bond strength and pull-out force were the lowest immediately after setting. After one-day storage, almost all the materials yielded their highest results. A weak, but statistically significant, correlation was found between flexural strength and shear bond strength (r = 0.508, p = 0.0026, n = 33). As the pull-out force increased, the flexural strength of core build-up materials also increased (r = 0.398, p = 0.0218, n = 33). Multiple linear regression analyses were conducted using these three independent factors of flexural strength, pull-out force and root dentin shear bond strength, which showed this relationship: Flexural strength = 3.264 x Shear bond strength + 1.533 x Pull out force + 10.870, p = 0.002). For all the 11 core build-up and luting materials investigated immediately after setting, after one-day storage and after 20,000 thermocycles, their shear bond strengths to root dentin and pull-out forces were correlated to the flexural strength in core build-up materials. It was concluded that the flexural strength results of the core build-up material be used in research and quality control for the predictor of the shear bond strength to the root dentin and the retentive force of the post.
en-copyright=
kn-copyright=

en-aut-name=IrieMasao
en-aut-sei=Irie
en-aut-mei=Masao
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MaruoYukinori
en-aut-sei=Maruo
en-aut-mei=Yukinori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishigawaGoro
en-aut-sei=Nishigawa
en-aut-mei=Goro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=YoshiharaKumiko
en-aut-sei=Yoshihara
en-aut-mei=Kumiko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=MatsumotoTakuya
en-aut-sei=Matsumoto
en-aut-mei=Takuya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

affil-num=1
en-affil=Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science
kn-affil=

affil-num=2
en-affil=Department of Occlusion and Removable Prosthodontics, Okayama University
kn-affil=

affil-num=3
en-affil=Department of Occlusion and Removable Prosthodontics, Okayama University
kn-affil=

affil-num=4
en-affil=National Institute of Advanced Industrial Science and Technology (AIST), Health and Medical Research Institute
kn-affil=

affil-num=5
en-affil=Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science
kn-affil=
en-keyword=flexural strength
kn-keyword=flexural strength
en-keyword=resin core build-up materials
kn-keyword=resin core build-up materials
en-keyword=durability
kn-keyword=durability
en-keyword=pull-out force
kn-keyword=pull-out force
en-keyword=bond strength
kn-keyword=bond strength
END