DENTAL AMALGM

&COMPOSI

T. ABCD’S&G.

DENTAL AMALGM & COMPOSITE

: DENTAL AMALGAMDental amalgam is a metal like

restorative material composed of a mixture of silver/tin/copper alloy

and mercury.

DENTAL COMPOSITE: They are highly cross linked

polymeric materials reinforced by a dispersion of

glass,crystalline or resin filler particles or short fibers bound to

the matrix by silane coupling agents .

 

COMPOSITION OF AMALGM & COMPOSITE

Dental Amalgam: Alloy of mercury, silver, tin,

and copper, it may also contain palladium, zinc ,

gold to improve the handling characteristics

Dental Composite:1-Resin matrix 2-Filler particles 3-Coupling agent .4-Activator-initiator system

required to convert resin to soft moldable filling material to hard durable restoration.

CALSSIFACTION OF AMALGM & COMPOSITE

Based on copper content : 1-Low copper alloy -- < 6% copper (conventional alloy) .2- High copper -- 6-30% copper (1)admixed alloy (2) single composition alloy

Based on zinc content : (1) zinc containing alloy -- > 0.01% zinc(2) zinc free alloy -- < 0.01 zinc. Based on shape of alloy particles :(1) lathe cut alloy.

(2) spherical alloy (3) admixed alloy.

Based on size of alloy particles (1) micro cut (2) fine-cut (3) coarse-cut.

Based on presence of noble metals :(1) noble metal alloys (palladium, platinum, gold) (2) non-noble metal alloys

COMPOSITION OF AMALGM & COMPOSITE

Dental Composite:

• Based on curing mechanism: • 1-Chemically activated • 2-Light activated• Based on size of filler particles:• 1-Conventional 8-12 um • 2-Small particle 1-5 um • 3-Microfilled 0.04-0.4 um • 4-Hybrid 0.6-1.0 um.

INDICATIONS OF AMALGM & COMPOSITE

Dental Amalgam:

• Restoration of posterior teeth(ClassI&II) (Moderate to large preparations).

• Class V preparations (when esthetics is not the prime concern).

• Core build up for badly broken down teeth in the posterior teeth.

• Sometimes in distal surface of canines.

• For moderate caries control.

INDICATIONS OF AMALGM & COMPOSITE

Dental Composite:

• Class I,II,III,IV,V,VI restorations.

• Foundation or core buildup.

• Esthetic enhancement procedures-

• Partial veneers and Full veneers.

• Diastema closure. • For periodontal splinting.

CONTAINDICATIONS OF AMALGM & COMPOSITE

Dental Amalgam: Dental Composite: 1.High caries incidence

and poor oral hygiene. 2.Teeth with heavy or

abnormal Occlusal stress.

3.If access & isolation difficulties.

4.Patient allergic or sensitive to resin composite.

1-Esthetics.2 -Extensive loss of

tooth structure3 -Small class I and class

II cavities.

ADVANTAGES OF AMALGM & COMPOSITE

Dental Amalgam: Dental Composite:

1-Ease of use.2- High compressive strength.3-Excellent wear resistance.4- long-term clinical results.5- Economic 6-Can be bonded to tooth structure.7-Self-sealing ability.

1.Esthetic .2.Conservation of tooth

structure .3.Insulative .

4.Bonded to tooth structure. 5.Repairable .

6.Can be polished at the same appointment

DISADVANTAGES OF AMALGM & COMPOSITE

Dental Amalgam: Dental Composite:

1-Lack of esthetics 2 -Less conservative

3 -Non-insulating 4 -Corrosion and

galvanism 5 -Lack of reinforcement of

weakened tooth structure

1.polymerization shrinkage .2.time consuming and

expensive .3 .More technique sensitive .

4 .difficult to finish and polish .5 .increased coefficient of

thermal expansion

MANIPULAION OF AMALGM & COMPOSITE

MANIPULATION OF AMALGAM1. Selection of alloy and mercury2. Mercury alloy ratio (Proportioning)3. Trituration (Mechanical and hand)4. Mulling5. Condensation (Hand and

mechanical)6. Pre-carve burnishing7. Carving.8. Post-carve burnishing.9. Polishing .

MANIPULAION OF AMALGM & COMPOSITE

Manipulation of composite:1. Selection of the resin composite

type and shade.2. Isolation of the field.3. Pulp protection.4. adhesive application.5. Matricing.6. Wedging.7. Packing.8. Contouring and shaping.9. Polymerization.10. Finishing and polishing.11. Maintenance.

Cavity preparation of amalgam and Composite .

CAVITY PREPARTION OF AMALGM & COMPOSITE

1. 90 degree CSA.

2. The walls must be parallel or perpendicular to occlusal loads.

3. A definite gingival seat of 1.5-2 mm. in depth for compound cavities.

4. Rounded internal line angles.

5. Sufficient bulk at the isthmus area

6. Each portion must have its own independent retention and resistance.

Cavity preparations for amalgam restorations :

CAVITY PREPARTION OF AMALGM & COMPOSITE

Cavity preparations for Composite restorations :

Tooth preparation : 1.Minimal extension. 2.Pulpal and axial walls of varying depth. 3.Enamel bevel. 4.Butt joint on root surface. 5.Tooth preparation walls must be rough.

CAVITY PREPARTION OF AMALGM & COMPOSITE

Cavity preparations for Composite restorations :

Cavity design preparation: 1-Conventional 2-Beveled conventional 3-modified 4-Box shape 5-Facial/lingual slot

Conventional Beveled conventional Modified (adhesive)

AMALGM & COMPOSITE

AMALGM & COMPOSITE

Amalgam filling material is still used everyday by most dentists. It is

considered safe to use and is very effective in a lot of circumstances. There are problems with amalgam. The main ones are it’s appearance and inability to bond/stick to teeth.

White, composite fillings are therefore becoming much more widely used

and are the preferred choice for many people..

 Composite filling material is a modern

‘white’ choice available as an alternative to the older amalgam

‘silver’ fillings. It has many uses and benefits. However, it has some

problems and amalgam is still better in some circumstances

ABCD’S&G.