The document discusses the history and development of porcelain jacket crowns (PJCs). The first all-ceramic crown was developed by Land in 1886 and was called a PJC. Originally made of feldspathic porcelain, PJCs are now made of advanced ceramics like aluminum oxide and zirconium. PJCs offer esthetic benefits but require more tooth reduction than metal crowns. They are best for anterior teeth but have limitations for posterior teeth or situations without adequate tooth structure.

1. Porcelain Jacket Crown
Dr. Bhupendra Rizal

2. • All ceramic crowns are the most estheticlly
pleasing restorations matching natural tooth
structure in terms of color, texture, & translucency.
• THE FIRST ALL-CERAMIC CROWN WAS DEVELOPED
BY “LAND” IN 1886.
• IT WAS CALLED AS PORCELAIN JACKET CROWN (PJC)
Dr. Bhupendra Rizal

3. • THE ORIGINAL PJC WAS MADE UP OF
“FELDSPATHIC PORCELAIN”
• PREDOMINANTLY MADE OF SILICON DIOXIDE, WITH
DIFFERENT FORMS,WHEN FUSES IT FORMS A GLASSY
MATERIAL THAT GIVES THE PORCELAIN ITS
TRANSLUCENCY
Dr. Bhupendra Rizal

4. • RECENT ADVANCES IN CERAMICS,ESPECIALLY ALL CERAMICS
ALUMINIUM OXIDE
ZIRCONIUM
• CASTABLE GLASS CERAMICS - DICOR
• CAD/CAM TECHNOLOGY IN DENTISTRY
Dr. Bhupendra Rizal

5. Advantages
• Esthetics- superior translucency similar to the unrestored natural tooth.
• Good Tissue response
• Conservative facial tooth reduction as there is no metal sub structure.
• Colour of the luting cement influences & modifies the appearance of
the restoration.
Dr. Bhupendra Rizal

6. Disadvantages
• Reduced strength because of the absence of the metal substructure.
• Less conservative lingual & proximal tooth preparation. Significant
tooth reduction required on the proximal & lingual surfaces as
shoulder type finish line required.
• Difficulty in obtaining well fitting margin.
• Inadequate tooth preparation then restoration prone for fracture.
Dr. Bhupendra Rizal

7. • 90 degree cavo surface angle required to prevent the fracture as there will be
favorable distribution of forces.
• Severely damaged tooth can not be restored as the preparation should
provide support along the incisal edge.
• Not for FPD , although the In – Ceram Zirconia, IPS Empress -2 suitable
for anterior sbut require 4x 4 mm connector with increased potential for
periodontal failure.
• Wear of the opposing tooth
Dr. Bhupendra Rizal

8. Indications
The PJC are used:
1. For anterior teeth (especially incisors).
2. For discolored anterior teeth.
3. An existing post and core substructure.
4 Endodontically treated anterior teeth.
Dr. Bhupendra Rizal

9. Contra-indications
The PJC are contraindicated:
1. In posterior teeth (when maximum resistance and retention is
needed).
2. In case of tooth with short clinical crown (no enough tooth
structure to support the porcelain).
3. In case of edge to edge or overbite occlusion.
4. As a retainer for FPD.
Dr. Bhupendra Rizal

10. Tooth preparation
Dr. Bhupendra Rizal

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