Vestibuloplasty procedure

 # A vestibuloplasty procedure is performed by:

A. Reducing buccal bone from the alveolar ridge with a barrel bur and a handpiece

B. Apically repositioning the muscular and mucosal attachments of the mandible

C. Reflecting the gingiva and using Rongeurs to remove bone from the alveolar crest

D. Using a bone file to smooth rough bony projections

E. Grafting harvested iliac or rib bone onto the alveolar process

The correct answer is B. Apically repositioning the muscular and mucosal attachments of the mandible

Vestibuloplasty is a procedure performed to lengthen the residual ridge and deepen the oral vestibule.

A vestibuloplasty can only be achieved by relocating or repositioning the muscle attachments and mucous membrane covering it into a deeper or more apical position. 

Vestibuloplasties are also accompanied with the use of a mucosal graft or a skin graft. 

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Most ideal finish line configuration for a porcelain veneer:

 # The most ideal finish line configuration for a porcelain veneer is:

A. Feather

B. Chamfer

C. Shoulder

D. Chisel

The correct answer is: C. Shoulder.

#Shoulder Finish Line

Indications: • All ceramic crowns • PFM crowns • Injectable porcelains 

Advantages:  • Good crown contours • Esthetics  • Less distortion • Provides adequate bulk

Disadvantages: • Least conservative • Inferior marginal adaptation

# Shoulder with bevel Finish Line

Indications: • Proximal boxes of onlays and inlays • Labial finish line of metal ceramics • Occlusal shoulder of onlays 

Advantages:  • Superior marginal adaptation • Resists distortion • Facilitates removal of unsupported enamel rods

Disadvantages: • Requires subgingival extension • Detection of post cementation caries is difficult

# Chamfer Finish Line

Indications: • Cast metal restorations • Lingual aspect of metal ceramics

Advantages:  • Conservative • Good marginal adaptation • Provides bulk

Disadvantages: • Improper fabrication may result in an unsupported tip

# Knife edge Finish Line

Indications: • Young patients • MOD onlay • Inaccessible areas • Finish lines in cementum

Advantages:  • Conservative • Ideal for marginal adaptation 

Disadvantages: • Does not provide a distinct finish line • Waxing, polishing and casting becomes critical • Overcontoured restoration in an attempt to obtain bulk

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Preferred gingival finish line for veneer metal restoration

 # The preferred gingival finish line for veneer metal restoration is:

a) Shoulder 

b) Chamfer

c) Shoulder with bevel 

d) Radial shoulder

The correct answer is B. Chamfer.

#Shoulder Finish Line

Indications: • All ceramic crowns • PFM crowns • Injectable porcelains 

Advantages:  • Good crown contours • Esthetics  • Less distortion • Provides adequate bulk

Disadvantages: • Least conservative • Inferior marginal adaptation

# Shoulder with bevel Finish Line

Indications: • Proximal boxes of onlays and inlays • Labial finish line of metal ceramics • Occlusal shoulder of onlays 

Advantages:  • Superior marginal adaptation • Resists distortion • Facilitates removal of unsupported enamel rods

Disadvantages: • Requires subgingival extension • Detection of post cementation caries is difficult

# Chamfer Finish Line

Indications: • Cast metal restorations • Lingual aspect of metal ceramics

Advantages:  • Conservative • Good marginal adaptation • Provides bulk

Disadvantages: • Improper fabrication may result in an unsupported tip

# Knife edge Finish Line

Indications: • Young patients • MOD onlay • Inaccessible areas • Finish lines in cementum

Advantages:  • Conservative • Ideal for marginal adaptation 

Disadvantages: • Does not provide a distinct finish line • Waxing, polishing and casting becomes critical • Overcontoured restoration in an attempt to obtain bulk

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Partial veneer crown is contraindicated in:

 # Partial veneer crown is contraindicated in:

a) Long teeth 

b) Short teeth

c) Tipped teeth 

d) Tapered teeth

The correct answer is B. Short Teeth.

Indications for partial veneer crown:

• Intact or minimally restored teeth .

• Teeth with normal anatomic crown form i.e., without excessive cervical constriction.

• Teeth with adequate crown Length.

Contraindications for partial veneer crown:

• High caries rate.

• Short teeth.

• Bell shaped teeth.

• Teeth with insufficient buccolingual width.

• Excessively restored teeth.

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