Dental Materials

Composite Cements

Composite Cements

 

Composite cements are composite materials with a higher percentage of resin and smaller particle sizes to reduce viscosity.

They are sometimes referred to as resin cements.

Originally they had a very high film thickness.

Before the development of dentinal bonding systems, leakage of composite cements was common and caused postoperative sensitivity.

– Modern composite cements have an improved film thickness (thinner).

With the use of a dentinal bonding system composite cements are the favorite
luting material of
many clinicians.

They are the material of choice for luting all ceramic restorations.

– If the ceramic material is properly etched and silanated, composite cement will bond the
restoration to the underlying tooth structure.

Composite cements are also useful for re-cementing poorly fitting crowns when the patient does not wish to have the inadequate crown remade.

Many types of composite cement systems are available.

They come as chemically activated, light-activated, and dual-cure systems.

– The activation method of the cement should be the same as the activation method of the accompanying bonding system.

– This combination of cement and bonding system can be quite complex and
requires attention to detail.

– Many times an additional component is added to the dentinal bonding system to change a light activated bonding system to a dual-cure bonding system.

– It is important to note self-etching one-step dentinal bonding systems are not compatible with chemically activated composite cements.

Regardless of product used, the tooth must not be contaminated by oral fluids during the
application of the dentinal bonding agent and cement, and the seating of the crown.

– Although one assistant may be adequate, for some products, use of a second assistant is wise.

Composite cements come as a single paste if light activated.

Single paste light-activated materials are used to bond veneers and orthodontic brackets.

– Dual cure and chemically-activated products are supplied as two pastes and are mixed on a paper pad with a plastic spatula.

As composite cements are used with esthetic restorations such as veneers, composite
cements come in a variety of shades.

– The color of the cement can change the appearance of an esthetic restoration.

Some products include try-in pastes to allow evaluation of the restoration with a specific shade.A composite cement kit containing etchant, dual-cure dentinal bonding agent, and the cement.

 

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