Resin Cements DA122 Dental Materials

Common Uses for Resin Cements: Permanent cementation of: Metal crowns Bonding porcelain crowns + bridges (Maryland included) Inlays Onlays Veneers Bonding orthodontic brackets Endodontic posts

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

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

Two Curing methods Light cured Self (auto) cured What do you think this means?

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

Self (auto) cured Resin supplied as two pastes Polymerization occurs through a chemical reaction No curing light involved

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

Appearance: Tooth colored Shaded to match porcelain or resin restoration

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

Common brand names: Relyx Nexus

Another common brand of resin cements:

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

All ceramic crown cementation Preparation etched for 15 seconds, rinsed and dried Dentin primer painted on preparation

All ceramic crown cementation Dual cure adhesive painted on preparation All-ceramic crown cemented with dual-cure composite resin cement

Final all-ceramic crown Excess cement removed; crown light cured for 30 seconds on facial surface, 30 seconds on lingual surface The final restoration, highly esthetic and translucent Copyright 2012 Porter & Chester Institute, Inc. All rights reserved