Complete Exam Guide Subject-wise practice platform
0 XP
Restorative Procedures and Materials

Cavity Design and Classification Practice Questions

19 free Cavity Design and Classification practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

Practice in Quiz Mode

Question 1 of 19 Medium

Which classification system is most commonly used to describe cavity location and design in restorative dentistry?

  1. A ICDAS
  2. B Mount‑Hume Classification
  3. C WHO caries classification
  4. D G.V. Black Classification

Correct answer: G.V. Black Classification

The G.V. Black classification is the traditional and most widely used system for classifying cavities based on their location and tooth surfaces involved. It remains a foundational concept in cavity design.

Question 2 of 19 Medium

According to G.V. Black’s classification, a cavity located in the pits and fissures of a molar’s occlusal surface is classified as:

  1. A Class II
  2. B Class I
  3. C Class V
  4. D Class III

Correct answer: Class I

Class I lesions refer to caries or cavities occurring in pits or fissures on the occlusal surfaces of molars and premolars (or similar pits/fissures on other teeth).

Question 3 of 19 Medium

Which class describes interproximal decay on a premolar (posterior tooth) that involves contact area but not the occlusal surface?

  1. A Class III
  2. B Class I
  3. C Class II
  4. D Class V

Correct answer: Class II

Class II cavity involves proximal (mesial or distal) surfaces of premolars and molars (posterior teeth), typically between teeth, not involving pits/fissures.

Question 4 of 19 Medium

A cavity on the mesial surface of a maxillary central incisor, not involving the incisal edge, falls under which class?

  1. A Class IV
  2. B Class I
  3. C Class III
  4. D Class V

Correct answer: Class III

Interproximal (mesial/distal) surfaces of anterior teeth not involving the incisal edge are classified as Class III.

Question 5 of 19 Medium

Decay involving the incisal edge and proximal surface of a maxillary canine should be classified as:

  1. A Class II
  2. B Class IV
  3. C Class VI
  4. D Class III

Correct answer: Class IV

When a proximal surface lesion of an anterior tooth also involves the incisal angle, it is classified as Class IV.

Question 6 of 19 Medium

Which cavity class refers to lesions on the gingival third of the facial or lingual surfaces of any tooth (anterior or posterior)?

  1. A Class V
  2. B Class I
  3. C Class II
  4. D Class VI

Correct answer: Class V

Class V cavities are located at the cervical (gingival) third of buccal or lingual surfaces of anterior or posterior teeth.

Question 7 of 19 Medium

Which class was later added to G.V. Black’s original five-class system to account for caries or damage on cusp tips and incisal edges?

  1. A Class VI
  2. B Class VII of the extended cavity classification framework
  3. C A modification of the original Class V cavity designation
  4. D Class 0 of the standard cavity classification

Correct answer: Class VI

Class VI was added later (not originally by Black) to include lesions on cusp tips of posterior teeth and incisal edges of anterior teeth.

Question 8 of 19 Medium

In cavity design, what is the “outline form” primarily concerned with?

  1. A Determining the type of restorative material
  2. B Establishing the external shape and boundary of the preparation
  3. C Deciding occlusion adjustments
  4. D Selecting the appropriate matrix band

Correct answer: Establishing the external shape and boundary of the preparation

Outline form defines the external shape and extent of the preparation — where walls, grooves, and margins will lie — before removing carious tooth structure. This is a fundamental step in cavity design.

Question 9 of 19 Medium

What is the purpose of designing appropriate resistance form in a cavity preparation?

  1. A To determine the shade and colour of the final restoration
  2. B To resist fracture of tooth and restoration under load
  3. C To make finishing and polishing of the cavity easier
  4. D To reduce the volume of local anaesthetic required

Correct answer: To resist fracture of tooth and restoration under load

Resistance form aims to shape the cavity so the remaining tooth and restoration resist forces during function, preventing fractures or failure.

Question 10 of 19 Medium

Which cavity classification describes a lesion located on the buccal pit/fissure of a premolar’s occlusal two-thirds buccal surface?

  1. A Class II
  2. B Class V
  3. C Class I
  4. D Class III

Correct answer: Class I

Pit and fissure lesions on occlusal, buccal, or lingual surfaces (including occlusal two-thirds buccal surfaces) fall under Class I.

Question 11 of 19 Medium

Which classification would be appropriate for a cavity on the distal surface of a first molar and also extending onto its occlusal surface (involving more than two surfaces)?

  1. A Class II involving only two surfaces
  2. B Class I limited to the occlusal pit and fissure surface alone
  3. C Complex multi-surface cavity beyond simple Class II
  4. D Class III of an anterior proximal surface

Correct answer: Complex multi-surface cavity beyond simple Class II

When a cavity involves more than two surfaces (e.g., occlusal plus distal), it becomes a complex or multi-surface cavity, not strictly limited to a single Black’s class. Modern cavity design acknowledges such complexity.

Question 12 of 19 Medium

Which of the following is a limitation of the traditional G.V. Black cavity classification when used with modern adhesive restorative materials?

  1. A It accounts for the severity of the carious lesion
  2. B It precisely guides the required size of the restoration
  3. C It over-extends preparations, being made for non-adhesive materials
  4. D It completely fails to include cavities located on the tooth root surface

Correct answer: It over-extends preparations, being made for non-adhesive materials

Because Black’s design was based on materials requiring mechanical retention (like amalgam), it often leads to removal of more tooth structure than necessary when used with modern adhesive materials, reducing conservation.

Question 13 of 19 Medium

What is meant by the “retention form” in cavity preparation design?

  1. A The shape that conforms to occlusal anatomy exactly
  2. B Features that resist dislodgement of the restoration along the path of insertion
  3. C The final polishing and finishing of restoration margins
  4. D The shape of the matrix band used

Correct answer: Features that resist dislodgement of the restoration along the path of insertion

Retention form involves designing the cavity (walls, grooves, undercuts) so the restoration resists displacement under functional forces, ensuring it stays in place.

Question 14 of 19 Medium

Which class of cavity is most likely to require a matrix band and wedge for proper restoration of proximal contact and contour?

  1. A Class V
  2. B Class I
  3. C Class II
  4. D Class VI

Correct answer: Class II

Class II cavities involve proximal surfaces of posterior teeth; to restore proper contact and contour, a matrix band and wedge are commonly required.

Question 15 of 19 Medium

Decay found on the incisal edge of a worn canine tooth (without other surfaces involved) corresponds to which class?

  1. A Class I
  2. B Class VI
  3. C Class III
  4. D Class IV

Correct answer: Class VI

Lesions on cusp tips or incisal edges (even without proximal involvement) are classified as Class VI.

Question 16 of 19 Medium

Which design principle ensures that the prepared cavity resists displacement or fracture when the restoration is loaded during chewing?

  1. A Outline form only
  2. B Retention and resistance forms
  3. C Matrix adaptation
  4. D Finishing and polishing

Correct answer: Retention and resistance forms

Retention form helps keep the restoration in place; resistance form ensures the tooth-restoration complex can withstand occlusal and functional forces without fracture. Both are core principles of cavity design.

Question 17 of 19 Medium

In modern conservative dentistry, what is a criticism of strictly following classical cavity designs derived from Black’s principles?

  1. A They are too conservative and leave carious tissue behind
  2. B They rely far too heavily on adhesive bonding for retention
  3. C They may remove more sound tooth structure than needed
  4. D They cannot be used together with amalgam restorative material

Correct answer: They may remove more sound tooth structure than needed

Using classical cavity designs tends to result in over-extension and unnecessary removal of healthy tooth structure when adhesive materials are used — a major criticism in modern conservative dentistry.

Question 18 of 19 Medium

Which classification system (by number of surfaces involved) defines a cavity that affects three or more tooth surfaces?

  1. A Simple cavity
  2. B Compound cavity
  3. C Complex cavity
  4. D Root cavity

Correct answer: Complex cavity

A complex cavity is defined as one involving more than two surfaces of a tooth (three or more surfaces), requiring careful restoration planning.

Question 19 of 19 Medium

If carious lesion extends below the cemento-enamel junction onto the root surface (gingival third), which G.V. Black class would typically describe this (if defined)?

  1. A Class V of the gingival third of the anatomical crown surface
  2. B Class VI of a cusp tip or incisal edge
  3. C Class III of an anterior proximal surface
  4. D Not covered by classical G.V. Black classification

Correct answer: Not covered by classical G.V. Black classification

Classical G.V. Black classification describes lesions on the anatomical crown (Classes I–VI). Root-surface caries falls outside these classes, as they were not defined in the original scheme.

0 / 19 answered