ABSTRACT
The purpose of this study was to evaluate the effects of surface treatments on shear bond strength between self-etching resin cement and resin composite core material. Eighty pairs of unequal sized cylindrical specimens (Ø5x5, Ø7x5 mm.) were made from resin composite core material (Clearfil Photo Core) and randomly divided into four surface treatment groups of twenty each as following; 1) no surface treatment, 2) ED primer II, 3) silanation and ED primer II, 4) sandblasting, silanation and ED primer II. Following identical treatment to one side of cylinders in each pair, they were bond with self-etching resin cement (Panavia F 2.0) had been bonded to specimen surfaces before shear bond strength tests were performed. The result of this study revealed that the highest mean shear bond strength was achieved for the group 4.The untreated surface group 1 showed the lowest mean bond strength but no significant difference was found when compared to those with ED primer II. In conclusion of this study, sandblasting, silanation and ED primer II group was the highest among the group tested. ED primer II was not effective for improving the shear bond strength.Keyword: resin composite core material, resin cement, shear bond strength
ABSTRACT
All-ceramic restorations are increasingly considered in esthetic dentistry, with new ceramics having higher flexural strength and chemical resistance, better thermal and electrical insulation and good biocompatibility. To improve bond strength with resin cement, various surface treatments are used. This article review general guidelines for surface treatment of all ceramic restorations that using resin cement and relevant clinical procedures.Keywords: surface treatment all-ceramic crown
ABSTRACT
The purpose of this study was to evaluate the effect of four primers, i.e., METAFAST (MF), Cesead II Opaque Primer (CP II) METAL PRIMER II(MP II), and ALLOY PRIMER(AP), on the shear bond strength between two resin cements, Panavia F (PF) and Superbond C\&B (SB), and Nickel-chromium (Ni-Cr) casting alloys. Two sizes of cylinder specimens (f7x2, f9x2mm, 100 pairs each) were cast. They were bonded with ten combinations of four adhesive primer and two resin cements. Then they were stored in a 37±2 oC waterbath for 24 hrs, and subjected to the shear bond test using universal testing machine. Results showed the group that used PF with CP II and also demonstrated a significant difference compared to those without primer. The ones using SB with MF exhibited the greatest mean shear bond strength but no significant difference was found when compared with no primer. Conclusion of this study showed the use of CP II for bond between Ni-Cr casting alloy and PF resulted in a high bond strength. SB group was not necessary to use adhesive primer.Keywords: adhesive primer resin cement, Ni-Cr casting alloy
ABSTRACT
Resin cements are used extensively in fixing prostheses because they have good mechanical properties. This study reviewed clinical application of three types of resin cements, resin cement with total etch adhesive system, resin cement with self etching system and self adhesive resin cement.Keywords: resin cement
ABSTRACT
The aims of this study were to measure and compare the effects of five different adhesive systems on the shear bond strength of orthodontic brackets bonded to porcelain surfaces and to analyze the modes of bond failure after de-bonding the brackets. One hundred porcelain cylindrical disks were divided into five groups. The orthodontic brackets were bonded to the porcelain using five different adhesive systems: Group I, etching with 9.6% hydrofluoric acid; Groups II and IV, etching with 37% phosphoric acid followed by Silane; Groups III and V, etching with 9.6% hydrofluoric acid followed by silane. Specimens in Groups I, II and III were bonded with System1™ + and those in Groups IV and V with Super-Bond C\&B. The shear bond strength was then tested using a universal testing machine. The mean shear bond strength values in Groups I to V were 10.9, 18.5, 20.7, 23.7 and 27.6 MPa, respectively. All data were analyzed using an analysis of variance. The lowest mean shear bond strength was in Group I and was significantly different (p \< 0.05) from that in the other groups. There was no significant difference between the mean shear bond strength values in Groups II, III and IV (p \< 0.05). Group V had the highest mean shear bond strength and was significantly different from that in Groups I, II and III (p\< 0.05). The porcelain/adhesive interface was the commonest site of failure in Group I (65%), whereas the failure sites in the other groups showed mixed types of bond failure with no specific location predominating. Some damaged porcelain surfaces were found in Groups II, III, IV and V. Keywords: shear bond strength, adhesive systems, dental porcelain, orthodontic bracket
ABSTRACT
The aims of this study were to measure and compare the mean shear bond strength of different adhesive systems for bonding orthodontic brackets to fluorotic and normal teeth. One hundred and twenty premolar teeth were divided into six groups (N=20), brackets were bond and fixed to the sample teeth. Groups 1, 2 and 3 contained normal teeth bonded with System TM1+, UniteTM and Super-Bond C\&B. Groups 4, 5 and 6 contained fluorotic teeth bonded with SystemTM1+, UniteTM and Super-Bond C\&B. Thermocycling was performed at 5+2○C and 55+2○C for 1,000 cycles. Shear bond strength was measured using an universal testing machine at a crosshead speed of 0.5 mm/min. The data were analyzed using two-way ANOVA. The results indicated the mean shear bond strength values of all adhesives used on normal teeth were significantly greater than those used on fluorotic teeth (p=0.000). With both normal and\ fluorotic teeth, the mean shear bond strength value of Super-Bond C\&B was significantly greater than the mean shear bond strength values of SystemTM1+and UniteTM (p=0.000).\ Keywords: shear bond strength, adhesive systems, fluorotic teeth
ABSTRACT
The purpose of this study was to evaluate the mean shear bond strength between 3 systems of resin cements (total etch, self etch, self adhesive) and coronal dentin. The crowns of 40 extracted premolars were split longitudinally in buccolingual direction, and then split in mesiodistal direction (from DEJ 1 mm). The crowns were mounted in aluminum ring with self cure acrylic resin. Specimens were wet abraded with 600-grit SiC paper and randomly divided into 4 groups (n=20). Eighty cylinders were made with Z350 composite resin (Æ 2 mm., 3 mm. in thickness). Composite resin specimens were bonded with dentin specimens by using either resin cement Variolink® II (Group1), PanaviaTM F2.0 (Group2), RelyXTM U100 (Group3), and Multilink® sprint (Group4) strictly following manufacturer’s instructions. The specimens were stored in water at 37 ± 20C for 24 hours. The specimens were tested to failure by a Instron® universal testing machine at a crosshead speed of 0.5 mm./min. Shear bond strength data (MPa) were analyzed with one-way ANOVA and Tukey’s multiple comparison test (p0.05) but higher mean shear bond strengths(p