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PubMedDate not supplied

Factors affecting the shear bond strength of bonded composite inlays.

PURPOSE: This article analyzes the influence of different pretreatments on the bond strength between inlays and the resin cement of three different composite inlay systems: Z-100, Targis, and Art Glass. MATERIALS AND METHODS: Four separate treatments of the composite-bonding agent interface were investigated: (1) untreated surface, (2) grinding, (3) sandblasting, and (4) sandblasting followed by silane treatment. Surface topography, roughness, and shear bond strength were evaluated using digital scanning electron microscopy, confocal laser scanning profilometry, and a Lloyd LRX equipped for shear bond testing, respectively. RESULTS: The bond strength is presented both with respect to composite surface pretreatment and with respect to different composite inlay systems. Independent of the composite inlay system, the sandblasted and silane-treated surface was found to give the highest bond strength values, followed by the sandblasted and ground surfaces. The untreated surface showed the lowest bond strength. For pretreated surfaces, Targis showed the highest (P < 0.05) bond strength values, followed by Art Glass and Z-100. This distribution, however, was reversed for the untreated interface, where Z-100 showed the highest bonding strength (P < 0.05). CONCLUSION: Surface pretreatment and roughness as well as the inlay material have an impact on the bond strength and the retention of composite inlays.

Adhesiveness↗
PubMed2000

[Wear study of dental restoration materials with a new study-system in vitro].

OBJECTIVE: To investigate abrasive wear of composite resins in vitro. METHODS: A chewing simulator was used to perform the abrasive wear of four composite resins in vitro and an accurate three-dimensional laser-scanning system was used to measure the abrasion los of the materials. RESULTS: According to worn volumes, the order of five materials is: Enamel < Targis Dentin < Dentacolor < Artglass < Vita Zeta. According to the worn-depthest-points, the order of five materials is: Enamel < Targis Dentin < Artglass < Dentacolor < Vita Zeta. CONCLUSION: Targis Dentin shows no significant difference on ware resistance from human enamel, while three other composite resins are poorer than human enamel. This system in vitro is effective, accurate, quick and economical.

Composite Resins↗
PubMedDate not supplied

Effect of acidulated phosphate fluoride solution on veneering particulate filler composite.

PURPOSE: The objective of the current study was to investigate the surface morphologic characteristics of prosthodontic composite materials treated with an acidulated phosphate fluoride (APF) agent. MATERIALS AND METHODS: Seven composite materials (Artglass, Axis, Belleglass, Cesead II, Dentacolor, Solidex, and Targis) were examined. Each material was packed into a split plastic mold and was polymerized with a laboratory photo-curing unit. Half of each composite disk surface was coated with a varnish, and the entire surface of the sample was treated with an APF agent. After removal of the varnish, surface roughness values (Ra) for the treated and untreated (ie, previously varnish coated) sides of all specimens were recorded with a surface analyzer and observed with a scanning electron microscope. RESULTS: Ra values for Cesead II, Solidex, and Targis showed a significant increase as a result of treatment with the APF solution. Microphotographs demonstrated that the macroinorganic fillers in the Cesead II and Solidex materials showed substantial dissolution caused by the APF agent. There were no significant statistical differences in the Ra values between the treated and untreated halves for any of the materials containing inorganic fillers composed entirely of diameters up to 1.0 microm. In particular, microphotographs of prepolymerized silica composite (classified as microfilled materials in Axis and Dentacolor) did not reveal any change of the specimen surfaces. CONCLUSION: The APF agent attacked inorganic fillers in the composite materials. Microfilled material surfaces were insensitive to the agent in comparison with macroinorganic filled material surfaces.

Acidulated Phosphate Fluoride↗
PubMedDate not supplied

Effect of surface conditioning techniques on the resistance of resin composite core materials on titanium posts.

OBJECTIVE: This study evaluated the resistance of various post and core materials against torsional forces on differently conditioned titanium posts. METHOD AND MATERIALS: One hundred fifty pure titanium posts (DIN 17850-Ti4/3.7065) were conditioned utilizing Silicoater Classical, Silicoater MD, Rocatec, Kevloc, and Siloc. Subsequently, three post and core materials (Adaptic, Coradent, Ti-Core) were applied to titanium posts that were previously coated with a light-cured opaquer (Dentacolor). Thirty sandblasted titanium posts were used as reference for each core material. Following thermocycling (5 degrees C to 55 degrees C, for 30 seconds or 5,000 cycles), maximum torsional forces were determined with an electronic torque movement key. RESULTS: Kruskal-Wallis, Mann-Whitney U-tests indicated significant differences between Adaptic, Coradent, Ti-Core (20.9 dNm, 18.84 dNm, and 18.62 dNm, respectively). There were no significant differences between Silicoater Classical (18.56 dNm), Silicoater MD (18.18 dNm), and Rocatec (16.95 dNm), while Siloc exhibited the highest results (20.44 dNm). Kevloc demonstrated significantly lower results (10.43 dNm) than those of other systems and the control group (14.49 dNm). CONCLUSION: Resistance of core materials against torsional forces on titanium posts increased with the use of chemical surface conditioning techniques, while the system using only acrylization did not improve the resistance in comparison to the unconditioned posts.

Acrylonitrile↗
PubMed2004

[Effects of thickness and opaque resin on the color of Artglass].

PURPOSE: The purpose of this study was to measure the normal color value and the infinite optical thickness value of Artglass DA3,and evaluate the effect of different thickness and the use of opaque resin on the color values of Artglass. METHODS: A Minolta CS-321 portable colorimeter was used for color value measurement. The CIE L*a*b* color system was used to describe the color of specimens. Color difference,quantitated in deltaE units, were determined according to the following formula: DeltaE=[(DeltaL)(2)+(Deltaa)(2)+(Deltab)(2)](1/2). DeltaE values below 1.5 was used as being identical for human eyes. Artglass disks with a thickness of 4.0 mm were fabricated and the normal color value were obtained by two specimens pile up. Fifteen groups of specimens of 0.5 to 4.0 mm were made and the color of them were measured on the white and metal background color. The specimens used opaque resin with the thickness of 1.5 to 3.5 mm were determined by colorimeter. RESULTS: The normal color values of Artglass DA3 were L* 61.23,a* -1.18,b* 11.29. The infinite optical thickness value of Artglass DA3 was 2.75 mm. The opaque resin can increase the values of L*a*b* of Artglass. The effect will disappear until the thickness reaches 2.50 mm. CONCLUSIONS: From this study, we conclude that the color values of Artglass have a negative correlation between thickness when the background color is white. Thickness and opaque resin have significant effect on the color values of Artglass.

Color↗
PubMedDate not supplied

Pulpal response to a new light-cured composite placed in etched glass-ionomer lined cavities.

This study evaluated the pulp biocompatability of a new light-cured composite resin which was placed in etched glass-ionomer-lined cavities of monkey teeth. The pulpal response to this material was less than that to zinc-oxide eugenol cement in each observation period. Therefore this material seems to meet acceptable biocompatability standards in nonhuman primates.

Animals↗
PubMed1991

[The effect of Aspan on live cells in vitro].

Cytotoxicity of an experimental vitrioionomeric cement Aspan has been proved on the basis of morphological reaction of cells cultivated in vitro. There was no decrease in toxic action of Aspan when recovered with Silfolit and Evicrol varnishes.

Dental Cements↗