AN INSIGHT INTO RESIN CEMENTS

TOPICS TO BE DISCUSSED

• DEFINITION OF RESIN CEMENTS• HISTORY• CLASSIFICATION• COMPOSITION• CLINICAL APPLICATIONS METALLIC PROSTHESIS ORTHODONTIC BRACKETS BONDING OF RESIN BASED VENEERS, INLAYS, ONLAYS, CROWNS &

FIXED PARTIAL DENTURES BONDING OF CERAMIC PROSTHESIS ENDODONTIC FIBRE POSTS

• TECHNIQUES• PROS AND CONS• CONCLUSION

DEFINITION OF RESIN CEMENTS

Resin cements are a group of dental cements composed of polymethyl methacrylate or dimethacrylate produced by mixing an acrylic monomer liquid with acrylic polymers and mineral fillers

It is chiefly used as a luting agent for fabricated and temporary restorations

HISTORYResin cements were first developed

in the 1950s

In the early 1970s resin composite was introduced as a crown and bridge cement

CLASSIFICATION OF RESIN CEMENTS

ADHESIVE RESINS

RESIN-MODIFIED GLASS IONOMER CEMENTS

COMPOMERS

CLASSIFICATION OF ADHESIVE RESINS

(1)CLASS-1 SELF-CURED – 2 COMPONENT SYSTEMS

(2)CLASS-2 LIGHT-CURED- 1 COMPONENT SYSTEM

(3)CLASS-3 DUAL-CURED - 2 COMPONENT SYSTEMS

According to CRAIG’S Restorative Dental Materials, 12th edition

COMPOSITION

• One major component is a diacrylate oligomer diluted with dimethacrylate monomers

• Silanated silica or glass• Initiator-accelerator system- peroxide amine• Self-cured, powder-liquid system 4-META• Self-cured, 2-paste system (phosphonate cement) Bis-GMA Resin Silanated quartz filler• Light cured, 1 component system Bis-GMA or UrethaneDMA Photo-initiator- Camphorquinone• Dual-cured, 2 component system Bis-GMA or UrethaneDMA Photo-initiator- Camphorquinone

MECHANICAL PROPERTIES

COMPRESSIVE STRENGTH(MPa)

TENSILE STRENGTH(MPa)

ELASTIC MODULUS(GPa)

BOND STRENGTH TO DENTIN(MPa)

52-224 37-41 1.2-10.7 11-24

CLINICAL APPLICATIONS

METALLIC PROSTHESIS

MARYLAND BRIDGES

ROCHETTE TYPE OF BRIDGES

ORTHODONTIC BRACKETS

BONDING OF VENEERS

BEFORE

AFTER

INLAYS,ONLAYS

CROWNS

FIXED PARTIAL DENTURES

BONDING OF CERAMIC PROSTHESES

Ceramic restorations can be quite translucent, and they require specific shades of luting cements to maximize their aesthetic appearance.

The inner surfaces of the ceramic prostheses with a glassy phase usually are etched and a silane coating may be applied before cementation for optimal retention

ENDODONTIC FIBRE POSTS

TECHNIQUES

CEMENTATION OF AN ALL-CERAMIC CROWN

Prepared tooth was etched for 15 seconds, rinsed and dried

Etchant was applied to the ceramic crown for 5 seconds

PRE-CEMENTATION PROCEDURE FOR PREPARED TOOTH

PRE-CEMENTATION PROCEDURE FOR CROWN

Dentin primer applied on preparation

Dentin primer applied on the crown

PRE-CEMENTATION PROCEDURE FOR PREPARED TOOTH

PRE-CEMENTATION PROCEDURE FOR CROWN

Dual cure adhesive painted on preparation

All-ceramic crown cemented with dual-cure resin cement

The final restoration, highly esthetic and translucent

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

BEFORE AFTER

Restoration of Endodontically treated tooth with Fibre reinforced resin posts

After post space preparation, length of the canal was determined with a radiograph

Post was tried into the canal and length verified

Canal was etched for 15 seconds

Canal was rinsed using an endodontic irrigation syringe with water

Canal was dried with a large paper point

Dentin primer is applied in the root canal

The adhesive must be either a dual cure or self-cure adhesive compatible with a dual-cure or light-cure resin cement

Post is painted with an adhesive

Dual-cure composite resin cement syringe into the canal with a Needle Tube

Light cure for 60 seconds

PROS AND CONS

PROSVarious shades of resin cements are

available which plays an important role in aesthetic dentistry

High bonding strength to tooth structure (11-24 MPa)

It doesn't expand on setting thereby minimizing fractured temporary or fabricated restorations.

CONSIts technique sensitive.If the total etch system is not used

impeccably and under controlled circumstances post-operative sensitivity can occur.

It is sometimes difficult to remove the excess cement after the cement has set or while removing the temporary prostheses.

This can result in some loss of tooth structure.

BRANDS AVAILABLE ARE:PANAVIA™ F 2.0 -KURARAY

VARIOLINK II –Ivoclar Vivadent

3M™ ESPE™ RelyX™ Unicem Self-Adhesive Universal Resin Cement

G-Cem Resin Cement- GC America

Appeal™ - Ivoclar Vivadent

Resin modified GIC or Resin cements???????

Resin cements are available in numerous shades

Resin cements don't expand upon setting whereas resin modified GIC expand.

Resin cements have higher compressive strength.

ON A PARTING NOTEHence RESIN CEMENTS are definitely an

obvious choice for various luting purposes in the dental clinics because of their shade availability, higher compressive strength.

THANK YOU!!!!!!

References PHILIPS’ Science of Dental Materials,11th edition,

ELSEVIER

CRAIG’S Restorative Dental Materials,12th edition, ELSEVIER

Mowafy OM, Rubo MH, El-Badrawy WA. Hardening of new resin cements cured through a ceramic inlay. Oper Dent. 1999 Jan-Feb;24(1):38-44.

Dental luting cements, Vol. 26, No. 3 ,NIH,Maryland

www.cda.org

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