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Luting

Cements

Dr. Ghazaleh Daryakenari

www.ghazaldarya.com

Insta: Dr.ghazaldarya

SUMMARY

SUMMARY

Cementation is one of the final steps in the sequence of clinical procedures for indirect restorations.

molecular interactions between a substrate (adherend) and an adhesive brought into close contact, creating an adhesive joint

Headings

Objectives

to help retain the restoration in place

Objectives

maintain the integrity of the remaining

tooth structure

Mechanism

-friction (or micromechanical interlocking)

-by an adhesive joint consisting of the prepared tooth, the cement, and the

restoration

Mechanism

-or a combination of both mechanisms

Acid- base cements

-easy to use

-good long-term clinical service

Acid-base

-Some release fluoride

and bond to tooth structures

Resin- base cements

-based on resin composites

-high bond strengths

Resin-based

-better mechanical properties

-more technique sensitive

The most basic aspect the cleanliness of the substrate

Saliva, biofilm, and other organic debris

The walls of a cavity preparation smear layer

All reduce the surface energy of the substrate and, consequently, its wettability

Cleanliness

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1

ACID-BASE CEMENTS

ACID-BASE CEMENTS

Zinc Oxide–Eugenol

Zinc Oxide–Eugenol

-For both temporary cementation and permanent fixation of metallic and metalloceramic crowns and bridges

-neutral pH

-antibacterial action

-low strength Temporary

Glass Ionomer

Glass Ionomer

calcium fluoroaluminosilicate glass

-the most popular materials for permanent cementation

-good physical properties

-adhere to the tooth structure and metals

-release significant amounts of fuoride

bacteriostatic

resistance of enamel and dentin

-it is extremely important to protect the cement against gain and loss of water

during the first 24 hours

-Bonding to tooth structures is one of the main characteristics of glass ionomers

-Its mechanical properties are superior to other acid-base cements and increases significantly over long periods

Resin-modified Glass Ionomer

Resin-modified Glass Ionomer

-an acid-base and a polymerization reaction.

poly(acrylic acids) modified with pendant methacrylate groups

Initiators for the light-cured polymerization

-does not show the early sensitivity to moisture conditions

-

-In vitro fluoride release by conventional and resin-modified luting glass ionomers was found to be similar

-Water uptake higher compared to resin cements

-Solubility in water is also higher compared to resin cements

2

2

RESIN-BASED CEMENTS

RESIN-BASED CEMENTS

Overview

Overview

-class 1 (self-cured),

class 2 (light-cured)

or class 3 (dual-cured)

-similar composition to that of restorative composites

-higher filler levels and higher conversion

correspond to higher mechanical properties

Self-Adhesive Resin Cements

Self-Adhesive Resin Cements

-simple application procedure

-combining the advantages of glass ionomers (adhesion, fluoride release) with mechanical properties comparable to those of resin cements

-higher cytotoxicity than resin cements and acid-base cements

Problems

Problems

3

3

1

THE PROBLEM

What kind of a cement is this?

2

2

How should we prevent the GI from over drying or moisture in the first 24 hours?

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