2006 Fiscal Year Final Research Report Summary
Influences on the bonding strength of resin-based cements for luting evaluated with setting behavior by the measurement of degree of conversion
| Project/Area Number |
17592039
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
補綴理工系歯学
|
|---|
| Research Institution | Showa University |
|---|
Principal Investigator |
FUJISHIMA Akihiro Showa University, School of Dentistry, Oral Biomaterials and Technology, Assistant Professor, 歯学部, 講師 (50209045)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Masato Showa University, School of Arts and Sciences, Chemistry, Assistant Professor, 教養部, 講師 (50277844)
SHIMIZU Takashi Showa University, School of Dentistry, Prosthodontics, Lecturer, 歯学部, 助手 (90384297)
MIYAZAKI Takashi Showa University, School of Dentistry, Oral Biomaterials and Technology, Professor, 歯学部, 教授 (40175617)
|
|---|
| Project Period (FY) |
2005 – 2006
|
| Keywords | Resin-based cement / Bonding strength / Setting behavior / Degree of conversion / Mechanical property |
|---|
| Research Abstract |
Seven kinds of resin-based cements for luting (5 composite type, 2 PMMA/MMA type) were evaluated by measuring shear bond strengths and mechanical properties, and inorganic fillers contents. Bonded surface of cp titanium (10x10x2mm) was polished or treated by sandblasting with 110μm alumina particles. The bonded surface was treated with a primer for metal (Epricord), then that was bonded by a resin-based cement with a cylindrical titanium specimen (Φ8mmx2mm). A shear bond test was performed using an universal testing machine. Diameteral tensile strength (DTS) was measured using a cylindrical specimen (Φ6mmxh3mm) of cured resin-based cements. Moreover, filler content was measured by an ash method. Composition of filler was analyzed by XRF. Filler was observed by backscattered electron images for the evaluations of characteristics.
SBS of resin-based cements to cp titanium treated by sandblasting with 110μm alumina particles with a primer for metal showed 40-75MPa. These SBS were significantly higher than that of polished surface with a primer (2.0-3.7 times). DTS of resin-based cements showed 20-50MPa, and differed in each cement. There was a little relationship between the increased ratio of SBS and DTS of resin-based cements, nevertheless same primer treatment was applied for the bonded surface.
Shape and composition of resin-based cements of composite type differed in each cement, and filler content showed 66〜75wt%. Relationship between filler content and DTS was not apparent comparing to resin composites. These result suggested that bond strength was influenced not only by mechanical properties of resin-based cements but also by curing behavior of cements greatly. Degree of conversion of resin-based cement by a film method analyzed with FT-IR indicated that a resin-based cement showed sufficient curing without light curing in spite of dual cure type. Therefore, analysis of curing behavior of resin-based cement was important to evaluate the bonding characteristics.
|
