Park Hyung-Yoon
(Department of Prosthodontics, College of Dentistry and Research Institute of Oral Science, Kangnung National University)
,
Cho Lee-Ra
(Department of Prosthodontics, College of Dentistry and Research Institute of Oral Science, Kangnung National University)
,
Cho Kyung-Mo
(Department of Conservative Dentistry, College of Dentistry and Research Institute of Oral Science, Kangnung National University)
,
Park Chan-Jin
(Department of Prosthodontics, College of Dentistry and Research Institute of Oral Science, Kangnung National University)
Statement of problem. According to the fracture pattern in several reports, fractures most frequently occur in the interface between the ceromer and the substructure. Purpose. The aim of this in vitro study was to compare the macro shear bond strength and microshear bond strength of a ceromer bonded...
Statement of problem. According to the fracture pattern in several reports, fractures most frequently occur in the interface between the ceromer and the substructure. Purpose. The aim of this in vitro study was to compare the macro shear bond strength and microshear bond strength of a ceromer bonded to a fiber reinforced composite (FRC) as well as metal alloys. Material and methods. Ten of the following substructures, type II gold alloy, Co-Cr alloy, Ni-Cr alloy, and FRC (Vectris) substructures with a 12 mm in diameter, were imbedded in acrylic resin and ground with 400, and 1, 000-grit sandpaper. The metal primer and wetting agent were applied to the sandblasted bonding area of the metal specimens and the FRC specimens, respectively. The ceromer was placed onto a 6 mm diameter and 3 mm height mold in the macro-shear test and 1 mm diameter and 2 mm height mold in the micro-shear test, and then polymerized. The macro- and micro-shear bond strength were measured using a universal testing machine and a micro-shear tester, respectively. The macro- and micro-shear strength were analyzed with ANOVA and a post-hoc Scheffe adjustment ($\alpha$ = .05). The fracture surfaces of the crowns were then examined by scanning electron microscopy to determine the mode of failure. Chi-square test was used to identify the differences in the failure mode. Results. The macro-shear strength and the micro-shear strength differed significantly with the types of substructure (P<.001). Although the ceromer/FRC group showed the highest macroand micro-shear strength, the micro-shear strength was not significantly different from that of the base metal alloy groups. The base metal alloy substructure groups showed the lowest mean macro-shear strength. However, the gold alloy substructure group exhibited the least micro-shear strength. The micro-shear strength was higher than the macro-shear strength excluding the gold alloy substructure group. Adhesive failure was most frequent type of fracture in the ceromer specimens bonded to the gold alloys. Cohesive failure at the ceromer layer was more common in the base metals and FRC substructures. Conclusion. The Vectris substructure had higher shear strength than the other substructures. Although the shear strength of the ceromer bonded to the base metals was lower than that of the gold alloy, the micro-shear strength of the base metals were superior to that of the gold alloy.
Statement of problem. According to the fracture pattern in several reports, fractures most frequently occur in the interface between the ceromer and the substructure. Purpose. The aim of this in vitro study was to compare the macro shear bond strength and microshear bond strength of a ceromer bonded to a fiber reinforced composite (FRC) as well as metal alloys. Material and methods. Ten of the following substructures, type II gold alloy, Co-Cr alloy, Ni-Cr alloy, and FRC (Vectris) substructures with a 12 mm in diameter, were imbedded in acrylic resin and ground with 400, and 1, 000-grit sandpaper. The metal primer and wetting agent were applied to the sandblasted bonding area of the metal specimens and the FRC specimens, respectively. The ceromer was placed onto a 6 mm diameter and 3 mm height mold in the macro-shear test and 1 mm diameter and 2 mm height mold in the micro-shear test, and then polymerized. The macro- and micro-shear bond strength were measured using a universal testing machine and a micro-shear tester, respectively. The macro- and micro-shear strength were analyzed with ANOVA and a post-hoc Scheffe adjustment ($\alpha$ = .05). The fracture surfaces of the crowns were then examined by scanning electron microscopy to determine the mode of failure. Chi-square test was used to identify the differences in the failure mode. Results. The macro-shear strength and the micro-shear strength differed significantly with the types of substructure (P<.001). Although the ceromer/FRC group showed the highest macroand micro-shear strength, the micro-shear strength was not significantly different from that of the base metal alloy groups. The base metal alloy substructure groups showed the lowest mean macro-shear strength. However, the gold alloy substructure group exhibited the least micro-shear strength. The micro-shear strength was higher than the macro-shear strength excluding the gold alloy substructure group. Adhesive failure was most frequent type of fracture in the ceromer specimens bonded to the gold alloys. Cohesive failure at the ceromer layer was more common in the base metals and FRC substructures. Conclusion. The Vectris substructure had higher shear strength than the other substructures. Although the shear strength of the ceromer bonded to the base metals was lower than that of the gold alloy, the micro-shear strength of the base metals were superior to that of the gold alloy.
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제안 방법
After testing, all the specimens were examined using a stereomicroscope (SZH-ILLB, Olympus Optical Co., Tokyo, Japan) at x 10 magnification to analyze the pattern of failure. The fracture mod啓 \yere divided into the adhesive fracture and cohesive fracture groups.
Cylinders of the dental composite resin were bonded to a prepared substructure surface, the macro-shear and micro-shear was tested at a specified rate, and the interfacial bond strengths were calculated.
These results are consistent with the rank of the micro-shear strength found in this study. Overall, although the bond strength of the veneer and the substructures differed according to the testing conditions, the test method would also affect the data according to the results of this study.
The latter was classified as a fracture in the veneer material or in the substructures. Subsequently, the fracture surface of the specimens was examined by scanning electron microscopy (SEMZ LEO 420; LEO LTD, Cambrige, UK) to investigate the surface morphology at the failure site.
manufacturer. The FRC specimens received a coating of a wetting agent (Vectris wetting agent; Ivoclar, Schaan, Liechtenstein) with a single brush application, which was allowed to dry for 1 minute.
The limitation of this study was the fact that a static test was performed in a dry environment. Water would be constantly present in the actual oral environment which would undergo repeated temperature and pH changes.
Therefore, the main purpose of this experiment was to compare the macro-shear bond strengths and the micro-shear bond strengths of the ceromer bonded to the metal alloy surfaces and FRC surface.
대상 데이터
All the wax specimens were invested under vacuum with a complete investment (Micro-Fine 1700, Talladium, Valencia, USA). After burnout at the temperatures specified by the manufacturer, the specimens were centrifugally cast in metal alloys according to the manufacturer' s instructions; Co-Cr alloy (Biosil, Degussa Dental, Postfach, Germany), Ni-Cr alloy (Rexillium DI, Pentronz Wallingford, USA) and type II gold alloy (A48; AlphaDent, Seoul, Korea). The alloy was melted with a gas-oxygen multi-orifice torch.
데이터처리
When the differences were significant, a multiple comparison test was performed using the Scheffe's method. Statistical analyses within the groups with regard to the test methods (macro- and micro- shear strength) were made using Student's t-test. The results of the fracture patterns of each group were analyzed with nonparametric chi-square test.
The macro- and micro-shear strengths were analyzed using one-way ANOVA to determine if significant differences existed at the 95% confidence level. When the differences were significant, a multiple comparison test was performed using the Scheffe's method.
Statistical analyses within the groups with regard to the test methods (macro- and micro- shear strength) were made using Student's t-test. The results of the fracture patterns of each group were analyzed with nonparametric chi-square test.
When the differences were significant, a multiple comparison test was performed using the Scheffe's method. Statistical analyses within the groups with regard to the test methods (macro- and micro- shear strength) were made using Student's t-test.
성능/효과
The results of this study showed that the micro-shear bond strength would be a better method for reflecting the bond strengths of the two materials. Furthermore, the bond strength of the Targis bonded to the gold alloy was too weak, which means that new methods will be needed to improve the strength.
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