| Summary: | 碩士 === 中山醫學院 === 口腔醫學研究所 === 85 === Abstract Resin-bonded fixed
prostheses have
been extensively used in dentistry.The purpose of this study is
to evaluate the
metal surface roughness and compare the shear bond strength of
base metal alloy
and commercially pure titanium (cp Ti) with different metal
surface treatments.
There were 120 extracted human posterior teeth sectioned at
cementoenamel
junction and embedded in epoxy resin. The exposed lingual or
palatal enamel surfaces
were flattened and polished.In total,120 metal specimens were
divided into three
groups as follows:Group I:casted Ni-Cr-Be;Group II:casted cp Ti;
Group III:
premachined made cp Ti and Group I was selected as the control
group.All specimens
have been subjected to porcelain firing cycles.And then each
group was divided into
four subgroups for different metal surface treatment as follows:
a)not treated b)
blasted with 50μm Al2O3 c)blasted with 50 μm Al2O3 and then
applied with V-primer(Sun Medical Co.,Ltd.Kyoto,
Japan)d)blasted with 50μm Al2O3 and then dipped into (3%H2
SO4+1%KMnO4).Five metal
specimens were randomly selected from each subgroup to examine
the surface roughness
with a surface profilometer(Surfcorder SE-40G,Kosaka,Japan).
The 4-META resinous cement were selected to bond the metal
surface on the etched
enamel and the shear bond strength were tested and recorded.A
Two-way ANOVA followed
by a Student-Newman-Keuls was used to analyze the data. There
were no statistically
significant difference of the roughness and shear bond strength
among casted Ni-Cr-Be,
casted cp Ti and premachined made cp Ti(p>0.05).The surface
roughness(Ra)of specimens
without sandblasted treatment showed significant smoother than
metal surface blasted with
Al2O3 or blasted with Al2O3 then applied with V-primer or
blasted with Al2O3 then dipped
into(3%H2SO4+1%KMnO4)(P<0.05).The shear bond strength of
sandblasted specimens were stronger
than specimens without sandblasted treatment(p<0.05).Fracture
surface and bonding surface were
evaluated by SEM(JSM-T300,JEOL,Japan).
It was concluded that metal surface treatment will have
influence on the surface roughness
and bonding strength with 4-META luting cement.Clinically,cp Ti
could be an alternative metal for
resin-bonded fixed prostheses.
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