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Resin Cements

DA122 Dental Materials

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Common Uses for Resin Cements:

• Permanent cementation of:– Metal crowns– Bonding porcelain crowns + bridges (Maryland

included)– Inlays– Onlays– Veneers– Bonding orthodontic brackets– Endodontic posts

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Special Properties:

• Some are shaded• Radiopaque (show up bright white on

radiograph)• Can irritate pulp and require a liner first• Tooth structure must be free of plaque and

debris• Requires special preparation of tooth

surface (etching agent) for resin cement to adhere to tooth

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Ratio/Armamentarium:

• Ratio: equal amounts of base and catalyst (1:1)– May also be packaged as a syringe or in a jar, as

a light cure or dual cure

• Armamentarium:– Etching system– Bonding system– Cement kit– Mix pad– Spatula (disposable plastic sort)– 2x2 gauze– Curing light

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Two Curing methods

• Light cured• Self (auto) cured• What do you think this means?

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Light Cured

• One cure method requires the use of an additional piece of equipment-curing light

• This method of “setting” the material is known as light-cured

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Self (auto) cured

• Resin supplied as two pastes• Polymerization occurs through a chemical

reaction– No curing light involved

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Mixing Instructions:

• Mixing surface: paper pad• Mixing instrument: disposable spatula• Mix time: 20-30 seconds, until homogeneous

in consistency• Set time:

– Light cure: 40 seconds per tooth surface (read directions for time. Clearfil is light cured for 2-5 seconds)

• Used for porcelain, veneers, ortho brackets

– Self cure: 10 minutes• Used for metal and endo posts

– Dual cure: 40 seconds for initial set, then 10 minutes for complete set

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Appearance:

• Tooth colored• Shaded to match porcelain or resin

restoration

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Clean up:

• Disposable paper pad is used– Remove layer used and discard, disinfect pad

prior to putting away

• Disinfect disposable spatula, or throw away• Clean excess off of crown margin before

curing completely

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Common brand names:

• Relyx• Nexus

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Another common brand of resin cements:

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Preparation for all-ceramic crown

• The Twin Luscent Anchor was cut down to the level of the access with a diamond on a high speed handpiece

• Restoration of the access and Class 3’s with composite resin. Note, no discoloration of gingiva with Twin Luscent Anchor

• Preparation for an all-ceramic crown

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All ceramic crown cementation

• Preparation etched for 15 seconds, rinsed and dried

• Dentin primer painted on preparation

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All ceramic crown cementation

• All-ceramic crown cemented with dual-cure composite resin cement

• Dual cure adhesive painted on preparation

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Final all-ceramic crown

• Excess cement removed; crown light cured for 30 seconds on facial surface, 30 secondson lingual surface

• The final restoration, highly esthetic and translucent

• Copyright 2012 Porter & Chester Institute, Inc. All rights reserved