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Texts Authored by Harry Albers, DDS
Cements - Resin and Metal Bonding
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Introduction to Metal Bonding:
Metal adhesive luting cements are cements whose active chemical component is in the composite. Almost any resin can be used to bond to metal if a metal bonding agent is first applied. The major reason for metal resin luting cements is their ease of use. Almost all metal adhesives bond best to a sandblasted surface. Tin plating usually increases the bond strength further. Metal bonded luting agents must be chemically cured since light will not go through metal.
Tin plating after sandblasting causes the formation of tiny crystals that enhance the micro-mechanical bond achieved with sandblasting and provide micro-mechanical retention for the luting cement.
Most tin plating devices are pen-shaped and contain batteries. They come with an electrodeposition solution. The applicator consists of a cathode spring clip that attaches to the casting, and an anode that attaches to the unit. The unit has a 4.5-volt power source provided by three N-size batteries.
To use the device, fasten the cathode lead wire from the electroplater to the casting to be plated. Attach a small (about 1-mm square) cotton pellet soaked with the electrodeposition solution to the instrument tip and gently brush the soaked cotton tip on the area to be plated. This deposits a light gray tin layer where the anode point contacts the casting. (Danville Engineering: 800-827-7940).
Impact Coatings for Adhering to Metal:
(ESPE) uses a special sandblasting material that allows any resin to be bonded to any metal or ceramic surface. It works by using special beads with a sandblaster to place a bondable glass coating on the surface. A silane is then added and the resin bonds to it. Cojet is easy to use but does change the color of a metal surface. When used on non-etchable ceramics the color is not affected. Cojet can be used with Compolute, which is a dual-cured composite luting agent in capsule (same as their glass-ionomer capsules) for tituration. Besides Cojet, there are a number of metal primers from G-C and other manufacturers that have favorable bond strengths.
Composite Resins with Metal Adhesion:
These will adhere to metal without metal conditioning (such as tin plating and CoJet). Panavia EX (Kuraray) was the first metal bonding adhesive to gain widespread use. It is a very technique-sensitive powder/liquid material and has a large air inhibition layer than can be difficult to cover sufficiently to allow curing. However, the product has enjoyed long-term clinicial success.
(J. Morita USA/Kuraray) is an improved version that is easier to use and has a longer working time. Panavia also now comes in a dual-cured form. A major disadvantage of Panavia is its limited shades.
CHEMICAL-CURE adhesives: Panavia EX and Panavia 21 (Kuraray), Imperva Dual Bond (Shofu), and C& B Metabond (Parkell) are good for bonded metal restorations. A major disadvantage is limited shades.
DUAL-CURE resin adhesives: RelyX ARC Resin Cement (3M). A number of metal primers are also available that can be used to bond conventional composite resin cements to untreated metals.
Conventional Resin Cements:
Most conventional resin luting cements can adhere to metal with metal conditioning (tin plating or CoJet) or a metal adhesive. Conventional resin luting cements are available in light-cure, chemical-cure, or dual-cure forms. Dual-cured resin cements, the most popular, usually come in two pastes; the "base paste" is light-cured for bonding veneers, and the "catalyst paste" (usually in two viscosities) is used for inlays, onlays and full-coverage units.
Some of these products are (DUAL CURE):
(Vivadent); they come with three base shades and two viscosities of catalyst and try-in pastes.
(Vivadent) is an expanded kit.
and Cement-It (54% vol./1Ám filler Jeneric-Pentron) and
(Kerr) come with three base shades and two viscosities of catalyst and try-in pastes.
Opal Luting Composite
(3M) comes in a number of shades. LIGHT CURE:
(Vivadent), Insure (Cosmodent), and
PVS Porcelain Bonding Kit
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