Ceramic Inlays & Onlays

THE QUEST FOR AN ESTHETIC POSTERIOR RESTORATION THAT IS BOTH CONSERVATIVE AND PREDICTABLE HAS PLAGUED THE DENTAL PROFESSION FOR MANY YEARS. RECENTLY THE COMBINATION OF SEVERAL DIFFERENT FACETS OF OPERATIVE DENTISTRY HAS RESULTED IN A MOST EFFECTIVE SOLUTION :

ETCHED PORCELAIN INLAYS & ONLAYS

INDICATIONS

Small to moderate carious lesions

Large carious or traumatic lesions with undermined enamel to the extent that a cast-metal restoration or a full crown normally becomes necessary.

Endodontically compromised tooth.

Where metal allergy is a factor

The restoration of teeth in an arch opposed by already present porcelain restorations.

Teeth where it is difficult to develop retention form.

CONTRAINDICATIONS

Heavy occlusal forces

Inability to maintain a dry field.

Deep sub gingival preparations.

ADVANTAGES• Improved physical properties.

• Improved wear resistance.

• Radiodensity

• Ability to strengthen remaining tooth structure.

• More precise control of contours & contacts.

• Biocompatibility & good tissue response.

DISADVANTAGES• INCREASED COST & TIME

• TECHNIQUE-SENSITIVITY

• BRITTLENESS OF CERAMICS

• WEAR OF OPPOSING DENTITION & RESTORATIONS

• RESIN TO RESIN BONDING DIFFICULTIES

• LOW POTENTIAL FOR REPAIR

• DIFFICULT INTRAORAL POLISHING

PRINCIPLES OF CAVITY PREPARATION FOR INLAY

TWO ALTERNATE FORMS FOR PULPAL FLOOR OF CAVITY PREPARATION;FORM IS DEPENDENT ON CAVITY DEPTH

CLASS 3 INLAY

Class iv inlay

PRINCIPLES OF CAVITY PREPARATION FOR ONLAY

ARMAMENTARIUM

C.I.P two-grit diamond Round micro-fine diamond C.I.P no.4

PROCEDURE FOR PORCELAIN INLAY

Ceramics can be designed by CAD-CAM

technology.The restorations can be made

to fit the teeth accurately with excellent

esthetics for better function.

Cerec 1 -1987

Cerec 2-1994

Cerec 3-2000

Cerec in lab-2001

MILLING PROCESS

OPTICAL IMPRESSION WITH AN INTRA ORAL SENSOR

THE STEPS REQUIRED FOR MAKING A CAD-CAM RESTORATION ARE--

CEMENTATION OF THE RESTORATION

ADVANTAGES OF CAD/ CAM TECHNIQUE

• COMPLETE CONTROL

• SINGLE APPOINTMENT

• NO IMPRESSION

• NO PROVISIONAL RESTORATION REQUIRED

• COST CONTROL

• HIGH BONDABLE QUALITY RESTORATION

• BETTER FIT

• REDUCED MARGINAL GAP.

• LESS FRACTURE OF THE INLAY, BECAUSE IT IS MILLED FROM A SOLID,HOMOGENEOUS BLOCK.

• IMPROVED ESTHETICS.

• EXCELLENT POLISHING CHARACTERISTICS.

• LESS REDUCTION OF TOOTH STRUCTURE, HENCE

BETTER PERIODONTAL HEALTH.

THE FUTURE OF ESTHETIC RESTORATIVE DENTISTRY WILL NO DOUBT SEE CONSIDERABLE IMPROVEMENT IN LONGER-LASTING CEMENTING MATERIALS, EASE OF CONSTRUCTION, AND IN THE PORCELAIN MATERIALS THEMSELVES.

FINALLY, FUTURE DEVELOPMENTS IN CAD-CAM CAPABILITY WILL NO DOUBT HAVE A POSITIVE EFFECT ON ALL ASPECTS OF BOTH ANTERIOR AND POSTERIOR RESTORATIONS…

Thank you…….