Dentosphere : World of Dentistry

 # Fishman’s index is used in relation with: A. Population B. Hand-wrist radiographs C. Cephalograms  D. Periodontal diseases The correct answer is B. Hand-wrist radiographs. The following are the most commonly used methods for determination of skeletal maturity through hand-wrist xrays:  - Atlas method by Greulich and Pyle - Bjork Grave and Brown method - Singer's method of assessment - Fishman's skeletal maturity indicators - Hagg and Taranger method CLICK HERE FOR MORE MCQs

 # Carpal radiograph is used for assessment of: A. Bone condition B. Chronological age C. Treatment plan D. Skeletal maturation The correct answer is: D. Skeletal Maturation. There are different methods to assess the skeletal maturity of an indivudual which include: 1. Use of hand wrist radiographs 2. Evaluation of skeletal maturation using cervical vertebrae 3. Assessment of maturity by clinical and radiographic examination of different stages of tooth (Lower third molar) Hand wrist radiograph is the most reliable among all these.  CLICK HERE FOR MORE MCQs

 # 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.  CLICK HERE FOR MORE MCQs

 # 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 Di...

 # 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 ada...

 # 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. CLICK HERE FOR MORE MCQs

 # In partial veneer crown, retention can be increased by: a) Increased length of path of insertion b) Increase in taper c) Making path of removal parallel to long axis of adjacent teeth d) None of the above The correct answer is A. Increased length of path of insertion. Crown preparation with long, parallel axial walls and grooves produces maximum retention. Increasing the taper decreases retention. A short, over tapered preparation, decreases the retention because the restoration can be removed along an infinite number of paths. CLICK HERE FOR MORE MCQs