SECTIONEDITORS
Surface preparations for metal frameworks of composite resin veneered prostheses made with an adhesive opaque resin Hideo Matsumura, DDS, DDSC,~ Mitsumasa Kawahara, DDS,b Takuo Tanaka, DDS, DDSC,~ and Mitsuru Atsuta, DDS, DDScd NagasakiUniversity, School of Dentistry, Nagasaki-City, Japan Bond strengths of a laboratory developed light-cured composite resin to dental casting alloys were evaluated with a new adhesive opaque resin. The metal specimens were type III gold, nickel-chromium, and cobalt-chromium alloys, while the surface treatments for bonding were heating, Sn plating, and ion coating. The cast metal specimens were “particle blasted” with aluminum oxide and were surface treated. Adhesive 4-META/MMA-TBB opaque resin was applied and a light-cured composite resin was placed over the opaque layer. The prepared specimens were thermocycled in water and shear bond strengths were recorded. The light-cured composite resin was bonded strongly to heated or Sn-plated type III alloy with 4-META/MMA-TBB opaque resin. Copper ion coating in a sputter coater was effective for all three alloys, with only slightly diminished bond strengths. These methods were satisfactory for making composite resin veneered prostheses.(J PROSTHET DENT 1991;66:10-5.)
C
omposite resin veneered restorations are now widely used in prosthodontics. However, the chief disadvantage of resin facings compared with ceramometal techniques has been poor bonding between veneer material and the metal framework. Mechanical retention such as undercuts, beads, loops, and wires have been indispensable for retaining facings on the cast metal. Tanaka et a1.l reported that spherical retention devices of approximately 200 pm in diameter were desirable for acrylic resin veneers for retention and for minimizing marginal leakage. The application of functional methacrylate was another attempt to improve the bonding between the veneer and the metal framework. Tanaka et a1.2developed a heat-cured adhesive opaque resin that contained 4-methacryloxyethyl trimellitate anhydride (4-META). Barzilay et a1.3 used self-cured 4META/MMA-TBB resin (Superbond C&B, Sun-Medical Co., Ltd., Kyoto, Japan) to bind light-cured fixed prosthodontic composite resin and alloys. The Silicoater system (Kulzer & Co., GmbH, Friedrichsdorf, Germany) developed by Musil and Tiller4 is a new method for bonding composite resin to casting alloys, with a functional mono-
*Instructor, Department of Fixed bResearch Associate, Department CAssociate Professor, Department dProfessor, Department of Fixed 10/l/24174
10
Prosthodontics. of Fixed Prosthodontics. of Fixed Prosthodontics. Prosthodontics.
mer of 3-trimethoxysilylpropyl methacrylate. Matsumura and Nakabayashi5 described a self-curable 4-META/ MMA-TBB opaque resin that contained poly(methy1 methacrylate)-coated titanium dioxide and an adhesive 4META monomer. The 4-META/MMA-TBB opaque resin bonded to cobalt-chromium alloys with high chromium content. However, this resin was incapable of binding composite resin to precious alloys. To resolve this problem, various treatments of metal frameworks were introduced. This study compared heating, Sn plating, and ion coating for dental alloys to create a strong bond between laboratory light-cured composite resin and metal frameworks with 4META/MMA-TBB opaque resin.
MATERIAL
AND METHODS
A light-cured prosthodontic composite resin (Dentacolor, D-120, Kulzer & Co., GmbH., Friedrichsdorf, Germany) was selected as the veneer material. The opaque resin was 4-META/MMA-TBB initiated by a tri-n-butylborane derivative (TBB)6 and cured at room temperature. The opaque resin contained 4-META monomer7 as an adhesion-promoting agent and poly(methy1 methacrylate)coated titanium dioxide5 as a pigment. The alloys tested were type III alloy (Midas, J. F. Jelenko & Co., New Rochelle, N.Y.), nickel-chromium alloy (SB-Bondloy I, TowaGiken Co., Ltd., Osaka, Japan), and cobalt-chromium alloy for ceramometal technique (Biocast, Rx Jeneric Gold Co., Inc., Wallingford, Conn.). The materials for this study are listed in Table I.
JULY1991
VOLUME60
NUMBER1
SL’RFACE
PREPARATIONS.
FOR
COMPOSITE
1. Alloys, opaque resin, and composite
Table
Material
Composite
Surface
Manufacturer
Type III Midas (2197 010683) Ni-Cr SI! -Bondloy (70601) Co-C? Bi xast (32170) 4-META’MMA-TBB opaque wsin*
Opaque resin
II.
resin used
Nallle
Alloy
Table
RESIN
wsin
Dentacolor, (7 1 227)
Surface preparations preparation
D-120
Type III
Ion coating
Type III Ni-Cr Co-Cr
Preparation
Ni 56.4, Cr 17.3, MO 1z.4, F-1.i’.!?.
iltllers :(.!I
CC) 62.0, (‘r i32.0. others 6.0 Initiator: Tri-n-hut~~lborane tirrivativ,, S.i Xlonomtr: MMA GiLlETA
Surface preparations for metal frameworks of composite resin veneered prostheses made with an adhesive opaque resin Hideo Matsumura, DDS, DDSC,~ Mitsumasa Kawahara, DDS,b Takuo Tanaka, DDS, DDSC,~ and Mitsuru Atsuta, DDS, DDScd NagasakiUniversity, School of Dentistry, Nagasaki-City, Japan Bond strengths of a laboratory developed light-cured composite resin to dental casting alloys were evaluated with a new adhesive opaque resin. The metal specimens were type III gold, nickel-chromium, and cobalt-chromium alloys, while the surface treatments for bonding were heating, Sn plating, and ion coating. The cast metal specimens were “particle blasted” with aluminum oxide and were surface treated. Adhesive 4-META/MMA-TBB opaque resin was applied and a light-cured composite resin was placed over the opaque layer. The prepared specimens were thermocycled in water and shear bond strengths were recorded. The light-cured composite resin was bonded strongly to heated or Sn-plated type III alloy with 4-META/MMA-TBB opaque resin. Copper ion coating in a sputter coater was effective for all three alloys, with only slightly diminished bond strengths. These methods were satisfactory for making composite resin veneered prostheses.(J PROSTHET DENT 1991;66:10-5.)
C
omposite resin veneered restorations are now widely used in prosthodontics. However, the chief disadvantage of resin facings compared with ceramometal techniques has been poor bonding between veneer material and the metal framework. Mechanical retention such as undercuts, beads, loops, and wires have been indispensable for retaining facings on the cast metal. Tanaka et a1.l reported that spherical retention devices of approximately 200 pm in diameter were desirable for acrylic resin veneers for retention and for minimizing marginal leakage. The application of functional methacrylate was another attempt to improve the bonding between the veneer and the metal framework. Tanaka et a1.2developed a heat-cured adhesive opaque resin that contained 4-methacryloxyethyl trimellitate anhydride (4-META). Barzilay et a1.3 used self-cured 4META/MMA-TBB resin (Superbond C&B, Sun-Medical Co., Ltd., Kyoto, Japan) to bind light-cured fixed prosthodontic composite resin and alloys. The Silicoater system (Kulzer & Co., GmbH, Friedrichsdorf, Germany) developed by Musil and Tiller4 is a new method for bonding composite resin to casting alloys, with a functional mono-
*Instructor, Department of Fixed bResearch Associate, Department CAssociate Professor, Department dProfessor, Department of Fixed 10/l/24174
10
Prosthodontics. of Fixed Prosthodontics. of Fixed Prosthodontics. Prosthodontics.
mer of 3-trimethoxysilylpropyl methacrylate. Matsumura and Nakabayashi5 described a self-curable 4-META/ MMA-TBB opaque resin that contained poly(methy1 methacrylate)-coated titanium dioxide and an adhesive 4META monomer. The 4-META/MMA-TBB opaque resin bonded to cobalt-chromium alloys with high chromium content. However, this resin was incapable of binding composite resin to precious alloys. To resolve this problem, various treatments of metal frameworks were introduced. This study compared heating, Sn plating, and ion coating for dental alloys to create a strong bond between laboratory light-cured composite resin and metal frameworks with 4META/MMA-TBB opaque resin.
MATERIAL
AND METHODS
A light-cured prosthodontic composite resin (Dentacolor, D-120, Kulzer & Co., GmbH., Friedrichsdorf, Germany) was selected as the veneer material. The opaque resin was 4-META/MMA-TBB initiated by a tri-n-butylborane derivative (TBB)6 and cured at room temperature. The opaque resin contained 4-META monomer7 as an adhesion-promoting agent and poly(methy1 methacrylate)coated titanium dioxide5 as a pigment. The alloys tested were type III alloy (Midas, J. F. Jelenko & Co., New Rochelle, N.Y.), nickel-chromium alloy (SB-Bondloy I, TowaGiken Co., Ltd., Osaka, Japan), and cobalt-chromium alloy for ceramometal technique (Biocast, Rx Jeneric Gold Co., Inc., Wallingford, Conn.). The materials for this study are listed in Table I.
JULY1991
VOLUME60
NUMBER1
SL’RFACE
PREPARATIONS.
FOR
COMPOSITE
1. Alloys, opaque resin, and composite
Table
Material
Composite
Surface
Manufacturer
Type III Midas (2197 010683) Ni-Cr SI! -Bondloy (70601) Co-C? Bi xast (32170) 4-META’MMA-TBB opaque wsin*
Opaque resin
II.
resin used
Nallle
Alloy
Table
RESIN
wsin
Dentacolor, (7 1 227)
Surface preparations preparation
D-120
Type III
Ion coating
Type III Ni-Cr Co-Cr
Preparation
Ni 56.4, Cr 17.3, MO 1z.4, F-1.i’.!?.
iltllers :(.!I
CC) 62.0, (‘r i32.0. others 6.0 Initiator: Tri-n-hut~~lborane tirrivativ,, S.i Xlonomtr: MMA GiLlETA
