Principles of Tooth Preparation Practice Test

These questions are part of the practice quiz. Start practicing

• Rank the following restorations from best retention to worst retention: molar complete crowns, premolar complete crowns, partial crowns, and intracoronal restorations.
• Which statement best defines retention form and resistance form?
• How does tooth preparation for an indirect veneer differ from that for an indirect crown?
• The functional cusp bevel should be on the buccal cusps of mandibular molars and the lingual cusps of maxillary molars.
• What is biologic width and why is it important in planning margins?
• Which aspect of margin quality contributes to impression accuracy?
• What is the main advantage of using a feather-edge margin for a crown prep?
• The rougher the surface texture, the retention of the crown is
• What is the correct description of the two issues caused by over-inclining the functional cusp bevel of a posterior prep?
• Which is a consequence of an excessive convergence angle in crown preparation?
• How does an excessive convergence angle negatively affect the final crown prep?
• What is the significance of cusp reduction in posterior crowns?
• Which statement correctly distinguishes occlusal clearance from occlusal reduction?
• The minimal occluso cervical/incisal cervical dimension for incisors and premolars is ___ mm. The minimal occluso cervical/incisal cervical dimension for molars is ____ mm.
• What is a key consequence of inaccurate margins in crown preparation?
• What range is clinically acceptable for the convergence angle of a single axial surface?
• Why are rounded internal line angles important in tooth preparation?
• Which type has the weakest retention among the listed options?
• Malocclusion of the opposing arches can lead to less tooth reduction being necessary.
• Rank the following luting agents from best retention to worst retention: Zinc-oxide eugenol, Glass ionomer, Zinc Phosphate, and Adhesive resin.
• An undercut in crown preparation can lead to which issues during cementation?
• A functional cusp bevel will never extend far enough to include the occlusal third of preparation height.
• Which of the following is true about PFZ chamfer margins?
• Which type of restoration generally has the greatest retention?
• Why should a crown prep be cylindrical in shape?
• How does insufficient axial reduction of the prep affect the final crown?
• Why do molar crown preps need to be taller than premolar/incisor crown preps to have the same level of resistance?
• What is the significance of the 'plane of reduction' in tooth preparation?
• What is the main difference between a shoulder margin and a chamfer margin in terms of tooth structure removal?
• For milled restorations in most esthetic materials, minimal thickness requirements approach which value in millimeters?
• Which preparation for indirect veneers emphasizes preserving enamel?
• For mandibular molars such as #30, the path of insertion should coincide with the long axis.
• When do we add auxiliary features (like mesial and distal notches) to a crown prep?
• Which of the following is NOT considered one of the four main aspects of the retention form?
• Which statement about solid zirconia crown occlusal reduction is correct?
• Which factor is essential when planning margins for an all-ceramic crown to ensure esthetics?
• Which statement about convergence angle is true?
• If you have a choice, which margin location is preferred for hygiene when feasible?
• What is the ideal axial reduction for a solid zirconia crown?
• Where should the finish line be located relative to the gingival margin to minimize periodontal impact?
• Describe the role of marginal integrity in tooth preparation and how it affects longevity.
• What is the purpose of a proximal box on a Class II preparation?
• The path of insertion for a crown should be the same as the tooth's long axis.
• Which statement best explains why post-operative sensitivity increases as more tooth structure is reduced during crown preparation?
• BruxXir Solid zirconia crowns are indicated for which applications?
• Which range describes the clinically acceptable occlusal reduction for a PFZ crown?
• Which statement correctly describes how a chamfer margin is formed?
• Which margin design is the most conservative option?
• Which of the following is an indication for crowns as a primary restoration method related to endodontic status?
• T/F: Those with high smile lines will definitely need to have subgingival margins in the esthetic zone.
• Which margin design is typically used for a crown that requires heavy material bulk?
• In posterior crown preparations, why is it important to maintain adequate crown thickness in areas with significant functional loading?
• A marginal gap from 50-120um is considered clinically acceptable in terms of longevity. What is the ideal gap?
• What is emergence profile?
• What are the three main margin designs we will focus on during PCD?
• What is the path of insertion for a crown?
• What height-to-width ratio indicates adequate resistance form?
• Two-plane reduction aims to provide which of the following?
• Resistance decreases as the preparation height (decreases/increases).
• In a full crown prep, what general guideline governs occlusal reduction relative to the opposing dentition?
• When is a provisional crown particularly important during tooth preparation?
• Resistance decreases as the taper or diameter of the crown prep (decreases/increases).
• Shoulder margins are indicated for which of the following crown types?
• Which margin design is typically chosen for a full-coverage crown on a posterior tooth when using ceramic material, and why?
• T/F: The auxiliary features of a crown prep meant to increase resistance also slightly increase retention.
• When preparing a tooth, the bur should be parallel to which axis?
• The height-to-width ratio compares which two dimensions of the crown prep?
• What are essential features of a good Class II preparation?
• Which margin geometry is typically favored for veneer bonding to maximize enamel involvement?
• What is the ideal chamfer margin width for a bilayered zirconia crown (PFZ)?
• For best retention form, the total occlusal convergence of a crown prep should range between which degrees?
• For mandibular molars, the path of insertion should not be perpendicular to the occlusal plane.
• True or False: A consultation with endodontist and orthodontist can occur after cementing the final crown.
• What considerations influence occlusal clearance during preparation?
• Which margin finishing description is most consistent with best practices?
• What is the clinically acceptable range for occlusal reduction for a bilayered zirconia crown (PFZ)?
• How does material choice affect margin design and depth?
• How should proximal contacts be treated during tooth preparation for a restoration?
• Two-plane reduction in posterior crowns is used to ensure what?
• In the context of proximal reduction, why is preserving the height of contact important?
• How do you ensure that a prepped tooth won’t be over-reduced during impression taking?
• When margins are placed subgingivally, which principle should be respected?
• The greater the surface area of the prep, the retention of the crown is
• What are the advantages of a slight chamfer margin for metal-ceramic crowns?
• What is the main disadvantage of using a chamfer margin for a crown prep?
• What is margin adaption?
• Why is beveling recommended at the margin for some ceramic restorations?
• Which statement about cusp reduction in posterior crown preparation is correct?
• When prep for an all-ceramic crown, what considerations ensure optimal esthetics?
• What are potential consequences of violating biologic width during margin placement?
• Which of the following is NOT one of the three main design areas to consider when preparing a tooth for a crown?
• Which statement is true about the solid zirconia crown occlusal reduction?
• Which statement correctly defines occlusal clearance?
• Which factor best describes the importance of preserving the height of contact during proximal reduction?
• How do you decide between a feather-edge margin and a shoulder margin for an anterior veneer?
• Which of the following is an indication for using a chamfer margin in a crown preparation?
• Which of the following lists the four main aspects of the retention form of a crown prep?
• Which dimension is used to determine the height-to-width ratio in assessing resistance form?
• Indications for using a feather-edge margin for a crown prep?
• What is the ideal axial reduction range for a PFZ crown?
• Which margin option is used to improve margin geometry?
• What is the margin width recommended for PFZ chamfer?
• Which ceramic material can be used anywhere a full-cast or metal occlusal restoration would be indicated?
• Which crown material typically requires an approximate 50 um marginal gap?
• Increasing the taper of the crown prep increases resistance.
• Which statement reflects a biologic consideration related to occlusion in crown preparations?
• The OC/IC:FL ratio should be at least ____ for all teeth.
• Which of the following margin characteristics most directly facilitates accurate impression taking for a crown prep?
• Rounded internal line angles contribute to
• Porcelain is relatively weak; which statement about placing porcelain on the occlusal surface of a posterior tooth is most accurate?
• Two-plane reduction in posterior crowns is described as providing what type of reduction?
• Which statement about margin adaption and final crown fit is true?
• Preserving marginal ridges during tooth preparation helps to achieve what outcome?
• Which statement describes the relationship between cement film thickness and retention form?
• Ferrule effect primarily provides resistance to fracture in which situation?
• Which margin design is typically used for many crowns and some ceramic restorations?
• Which of the following is a common finish line design used for veneers or bonded restorations with minimal tooth reduction?
• Which of the following is a disadvantage of using a shoulder margin for a crown preparation?
• How should you handle a tooth with limited occlusal clearance due to existing restorations?
• Describe ferrule and its clinical significance; what is the recommended ferrule length?
• Lack of which factor is outranked by dental caries and porcelain failure as a cause of failure of crowns and fixed dental prostheses?
• When possible, which margin location should be chosen?
• What is the general approach to enamel removal and margin location in veneer preparation?
• What are 3 disadvantages of using a feather-edge margin for a crown prep?
• Shoulder margin indications include which of the following?
• Which of the following is an indication for using a chamfer margin in a crown preparation?
• Which are the three main design areas to keep in mind when preparing a tooth for a crown?
• Which of the following is an indication for crowns that involves correcting occlusal planes?
• The path of insertion should align with the long axis to maximize seating and retention. Which option best reflects this?
• Malocclusion of the opposing arch can influence the amount of tooth reduction required during crown preparation.
• What are potential consequences if margins are placed subgingivally without justification?
• What is the difference between occlusal clearance and occlusal reduction in tooth preparation?
• Which crown material typically requires an approximate 10 um marginal gap?
• Which statement best describes how taper and diameter affect resistance?
• What is the ferrule length and how is it measured clinically?
• Which criterion is essential to prevent occlusal interferences in a crown prep?
• Which of the following is an indication for crowns as the primary restoration method for a tooth?
• The gap between an accurately adapted margin and the final crown varies by material. Which mapping is correct?
• Regarding the width of the bur used to form a prep margin, which statement is correct?
• Tilting toward the tooth while preparing it creates what common error?
• Tilting away from the tooth while preparing creates what common error?
• What is the most suitable bur for making a chamfer margin?
• What is the clinical significance of maintaining an adequate ferrule around a tooth restored with a post and core?
• What are best practices for finishing and polishing margins in tooth preparation?
• Which restoration has the second strongest retention after molar complete crowns?
• What are the advantages of a bevel on a finishing line in porcelain-fused-to-metal crowns?
• Beveling the margin is recommended for certain ceramic restorations to improve marginal integrity and esthetics. Which option best defines beveling?
• What is the purpose of establishing a finish line (margin) on a prepared tooth?
• If the crown prep is under-tapered (parallel), what is a likely outcome?
• Porcelain crowns require reduction to ensure adequate thickness in areas with significant functional loading.
• What is the clinically acceptable occlusal reduction for a solid zirconia crown?
• For a solid zirconia crown, the chamfer margin should be placed _____ supragingival.
• What is the ideal occlusal reduction for a solid zirconia crown?
• How does a tapered diamond bur with a rounded tip create a chamfer margin?
• What are key considerations when prepping a tooth with a post and core?
• BruxXir Solid zirconia crowns are described as suitable for what types of restorations?
• True or False: The effect of the thickness of adhesive/cement on the retention of crowns is unknown.
• How does tooth preparation influence the lab communication and fabrication process?
• In bonding, why is enamel preservation prioritized during preparation?
• What is the recommended approach to impression margins during tooth preparation?
• What is the main advantage of using a shoulder margin for a crown preparation?
• How should margins be checked clinically after tooth preparation?
• What is the purpose of adding a functional cusp bevel to posterior crown preparations?
• Which margin finishing practice best ensures a seal?
• Which situation justifies using a crown to support a removable partial denture (RPD)?
• Which of the following is true about the margin placement for a solid zirconia crown?
• Biologic width comprises what structures and approximately how much total space does it occupy in health?
• What is the primary objective of a tooth preparation in fixed prosthodontics?
• Which margin design provides a distinct margin?
• What is the role of a provisional restoration after tooth preparation?
• What is the main benefit of a smooth, regular margin preparation?
• How does isolation with a rubber dam influence the accuracy of tooth preparation?
• What is the typical enamel reduction range for veneer preparations?
• For a bilayered zirconia crown (PFZ), the chamfer margin should be placed _____ mm supragingival.
• Which of the following best describes how to evaluate the adequacy of a tooth prep for a crown?
• Which principle guides axial reduction in tooth preparation?
• Which statement about marginal integrity is NOT accurate?
• Which pairs correspond to retention and resistance forms?
• If a margin must be placed subgingivally due to esthetics, which approach is recommended?
• What is the ideal chamfer margin width for a solid zirconia crown (in millimeters)?
• What is the ideal convergence angle of a single axial surface?
• Why should we avoid undercuts when making crown preps?
• Why should only half the width of the bur be used to form a prep margin?
• What is the main difference between an inlay and an onlay prep?
• What is the ideal axial reduction range for a bilayered zirconia crown (PFZ)?
• To maximize restorative material bulk, which crown margin is preferred?
• Which statement is true about crown protection against fracture?
• Resistance is a function of what 3 aspects of a crown prep?
• For porcelain crowns, the amount of tooth structure that should be removed is typically...
• What are 3 advantages of using a chamfer margin for a crown prep?
• Resistance areas of a crown prep are defined as which of the following?
• What is the role of an optimal path of insertion in tooth preparation?
• What is the primary purpose of auxiliary features such as mesial and distal notches?