Preparation for Full

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Preparation for Full Partial Veneer Crowns

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• ???? ???
• ???

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PreparationsforPartial Veneer Crowns
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Advantages

• Preservation fo tooth structure
• Good accessibility
• Less gingival irritation
• More easily seated completely during cementation
• More easily verified by direct observation
• Accessible when EPT

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Disadvantages

• Retention?
• But!!!
• Single Cr./ Short-span Br. ? retainer??? ??!!!

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Lingual lock
Resistance?
Free enamel
Too lingual ?? ?? ??
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Contents

• Mx. Post. ¾ Crowns
• Post. Partial Veneer Variations
• Ant. ¾ Crowns
• Pin-modified ¾ Crowns

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Mx. Post. ¾ Crowns
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Mx. Post. ¾ Crowns

• ??? ?? ???
• ??? ????? ?? ???

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Mx. Post. ¾ Crowns
occlusobuccal line angle?? 0.5mm??
1.5mm
1.0mm
1.5mm
Occlusal reduction Round-end tapered diamond
171 L bur
Functional cusp bevel Round-end tapered diamond
171 L bur
Lingual axial reduction and finishing Torpedo
diamond bur
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Mx. Post. ¾ Crowns
Gingivofacial angle ??? ??
??? facial ???, Chamfer??? 0.5mm
Axial finishing Torpedo bur
Proximal axial reduction and finishing Short
needle and Torpedo diamond bur
Proximal grooves 171 L bur
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Mx. Post. ¾ Crowns
Groove ??? ??171L bur
groove outline
Utility wax? bur ??

• Groove ?? ? ??
• facial surface? undermine?? ???.
• ??? facial? ????.
• ??? ??? ???? ??

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Mx. Post. ¾ Crowns
1.0mm
0.5mm
for marginal integrity
Occlusal offset 171 L bur
Proximal flares Flame diamond bur
Buccal bevel Flame diamond and 171 L bur
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Post. Partial Veneer Variations
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prox. caries
shoulder? offset??
DB caries
Proximal box? ?? ?? 3/4
?? ??? 3/4
?? ??? 7/8
?? ?? occlusal offset
90? ??? ¾ Cr.
?? ??? reverse 3/4
???? ?? ??? proximal half
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Ant. ¾ Crowns
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Ant. ¾ Crowns

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• ???/??? ?? short-span Br.
• ??? ??
• ?? ??
• ??? ?? ?? ??
• ??
• ?? ??

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Ant. ¾ Crowns
0.7mm ??
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Incisal 2/3? ??
Lingual reduction Small wheel diamond
Incisal reduction
Lingual axial reduction Torpedo diamond

• ?? ?? ?? ???? ??? ??
• Labioincisal line angle? ??? ??
• 0.7mm??

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Ant. ¾ Crowns
Axial finishing Torpedo bur
Proximal axial reduction Long needle and
Torpedo diamond
Proximal grooves 169L 170L burs
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Ant. ¾ Crowns
??? apical labial
Proximal flares Flame diamond and bur
Incisal offset 171 L bur
Incisal bevel Flame diamond and 170 L bur
???? ???
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Pin-modified ¾ Crowns
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Pin-modified ¾ Crowns

• ???
• ?? lingual abrasion? ?? ??
• ???
• small/thin teeth
• large pulp
• malposition

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Retentive pin

• ? ??? ?? ?!!
• pin? ??? ??!!

0.6mmdrill?nylon bristle?iridioplatinum pin
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Pin-modified ¾ Crowns
0.7mm ??
Incisal 2/3? ??
??? ????
Lingual reduction Small wheel diamond
Proximal axial reduction Long needle and
Torpedo diamond
Lingual axial reduction Torpedo diamond
?? 1.5mm
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Pin-modified ¾ Crowns
Contact?? ??? ????
Axial finishing Torpedo bur
Proximal grooves 169L 170L burs
Proximal flares Flame diamond and bur
??? ?? 2?
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Pin-modified ¾ Crowns
Ledge
Incisal bevel Flame diamond and bur
Ledge, offset trough 170L burs
Pin holes ½ bur and 0.6 mm drill
Offset/Trough
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Pin hole?? ??
Tapered fissure bur ? Small round bur ? Twist
drill
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Thank you