Presentation is loading. Please wait.

Presentation is loading. Please wait.

Composite Resin Material

Similar presentations

Presentation on theme: "Composite Resin Material"— Presentation transcript:

1 Composite Resin Material
Part 11 Dr. Nesrien Ateyah

2 Introduction:  There were considerations regarding various properties of composites for successful composite restoration to be done.  These properties generally require specific technique in the restorative procedures Cavity preparation Application of the material

3  Cavity preparations should be conservative
as possible.  The extent of the preparation is usually determined by : Size Shape Location of the defect

4  The extension should provide access for
vision and instrumentation.  The strong bond which is developed b/w:  the etch enamel  bonding agent  composite This will promotes a strong indication for direct composites restoration to be used.

5 Acid Etch Phenomenon Developed by Buonocore in 1955.
Technique consists of: 1. Applying a solution or gel of 30 – 50 % phosphoric acid to enamel for 20 sec. to dentin for 30 sec 2. Thorough rinsing with water for 20 sec. 3. Drying the area with air free oil for 5 Sec.

6 Acid Phenomenon (cont’n)
Acid solution affect the prismatic structure of the enamel by preferential removal of either Prism core Prism Both Prism (I) Periphery core , periphery (II) (III)

7 This process results in an enamel surface characterized by:
Acid Phenomenon This process results in an enamel surface characterized by: 1) Numerous microscopic undercuts 2) Irregular surface in the enamel.

8 Acid Etch Effect  Provide a higher surface energy to enhance
  surface area for bonding.  Provide a higher surface energy to enhance wetting  contact angle good bonding Demineralized porous enamel rod end (5-50Mm ) The resin can penetrate and produce mechanical tags (mechanical interlock)

9 Acid Etch Effect Depend on  Kind of acid used.  Acid concentration.
 Etching Time.  Form of etching (gel, semi gel, solution)  Rinsing Time.  Way of Etching.  Enamel Instrumented b / f etchant.  Enamel of primary or permanent teeth.  Enamel is stained,demineralized or flouridated.

10 Enamel / Dentin Bonding System
 Bonding agents - Resins with low viscosity used for the adhesion to enamel or dentin.  Acid etching + fluid resin bonding agent the basis for the 1) Retention 2) Marginal seal against microleakage of the composite resin restoration placed in cavity preparation involving enamel margins.

11 Enamel/Dentin Bonding System
 Dentin can be pre-treated like enamel to produce a surface that is more retentive.  Dentin bonding system consists of: 1. Conditioning agent - to remove a smear layer (dentin debris) 2. Low viscosity hydrophilic resin primer  to ensure optimal wetting and bonding to the hydrated dentinal surface.

12 Enamel/Dentin Bonding System
3. Resin adhesive bonding agent [Unfilled resin (adhesive) BisGMA] applied to dentin or etched enamel

13  Acid Etching _ Remove 10Mm of enamel
surface  Conditioner _ Remove smear layer  Primer _ Stabilize collagen and facilitate penetration of bonding resin

14 Factors Affecting the Adhesive Bond
 Water.  Saliva.  Inadequate removal of acid etching.

15 Restorative Procedures:
 Shade selection  Cavity preparation  Etching liquid - for larger area sec. Gel • brush , syringe • untouched 15 sec • rinse 20 sec • dry 5 sec

16 Restorative Procedures: (cont’n)
 Bonding • brush • light air • cure 20 sec.  Dry field  if saliva or sulcular sweep age • reapply the acid • contact the preparation • etchant 10 sec • wash and dry.

17 Restorative Procedures:
 Matrix application aid in: • placing composite resin • contouring • reduce excess • minimize finishing time

18 Restorative Procedures:
 Two types of matrices • Polyester strip matrix • Compound supported metal matrix III, IV cavity preparations. Shape the strip to the desired tooth contour.

19 2) To provide slight separation of the teeth.
Restorative Procedures: Apply a wedge at the gingival margin: 1) Help to hold the strip in position. 2) To provide slight separation of the teeth. 3) To prevent a gingival overhang of the composite resin material. Wedge placed from the facial approach for lingual access cavities (vice versa).

20  using hand instrument [plastic instrument]  Light cure 40 sec.
 Application of composite  using hand instrument [plastic instrument]  Light cure 40 sec.

21 Finishing Technique for Composite
 Good technique and experience in inserting composite  reduce the amount of finishing required. 1) Flame shaped finishing bur  removing excess and contouring

22 2)Sandpaper disc  degree of abrasive. depend on the. amount of excess
2)Sandpaper disc  degree of abrasive depend on the amount of excess to be removed.

23 4) Pop-on discs and mandrel
3) Sof-Lex discs • for contouring and polishing • flexible • several diameter and abrasive textures. 4) Pop-on discs and mandrel • small diameter • placed, removed without the need for proper orientation. • will fit into embrasure areas. • useful in contouring and polishing gingival area.

24 6) Finishing strip (medium and fine) for • final contouring
5) No 12 surgical blade to remove inter proximal excess 6) Finishing strip (medium and fine) for • final contouring • finishing of proximal surface Should be curved over the restoration.

25 7) Rubber polishing point
8) Aluminum oxide polishing paste  for final polishing..

26 Occlusion:  Remove the rubber dam
 Evaluate occlusion by having the patient close lightly on the articulating paper  if excess is present, remove only a small amount at a time and recheck.


Download ppt "Composite Resin Material"

Similar presentations

Ads by Google