DA 122 Dental Materials

Purpose Category of materials used to prepare the teeth for restorative materials Mixed at chairside by the DA, at direction of the dentist DA responsible for maintaining materials and mixing equipment Each type of material may have a variety of uses or consistencies

Supplied as: Powder/liquid kits Two-paste systems (base and catalyst) Capsule Dispensing syringe Most mixed manually but some come in capsules and are mixed mechanically

Powder + liquid

Two-paste System

Capsules

Amalgamator for Capsules

Liquid syringe

Consistencies Precise ratios used to get specific consistency Range from liquid solution, luting consistency, and putty consistency

Luting consistency

Putty Consistency

Setting/curing Self-curing: chemical reaction between two materials Light cured: require a special curing light Dual-cured: combine self-curing properties and light-curing techniques

Curing Light

Terminology Luting: bonding or cementing together inlays, onlays, crowns, bridges Permanent luting cement: long-term cementing agent Temporary luting cement: short-term cementing agent Intermediate luting cement: lasts 6-12 months

Terminology (continued) Liner: material placed in a thin layer on walls and floor of cavity preparation; protects pulp from bacteria and irritants Base: putty or thick layer between tooth and restoration; protects pulp from chemical irritation, temperature changes, electrical protection, mechanical injury

Liner, Base, Varnish

Terminology (continued) Sedative or palliative effect: soothing effect on a tooth; may relieve pain but does NOT cure the problem

Armamentarium for Dental Cements Mixing pad or slab Cement kit Cement Spatula Plastics Filling Instrument Gauze Clean-up supplies

Armamentarium

Common Dental Cements Zinc phosphate (ZnP) Zinc Oxide Eugenol (ZOE) Polycarboxylate Glass Ionomer Copyright 2012 Porter & Chester Institute, Inc. All rights reserved