A complete or partial removable denture supported by retained roots is known as:

 # A complete or partial removable denture supported by retained roots is known as:

A. Conventional immediate denture

B. Transitional immediate denture

C. Cast partial denture

D. Over dentures

The correct answer is D. Overdenture.

Overdentures are defined as, 'a dental prosthesis that replaces the lost or missing natural dentition and associated structures of the maxilla and/or mandible and receives partial support and stability from one or more modified natural teeth'. 

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An anterior tooth bounded edentulous area which crosses the midline:

 # An anterior tooth bounded edentulous area which crosses the midline:

A. Class I

B. Class III

C. Class IV

D. Class IX

The correct answer is C. Class IV.

Class IV Kennedy classification is a single but bilateral (crossing the midline) edentulous area located anterior to the remaining natural teeth.

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Which of these muscles may affect the borders of mandibular complete denture?

 # Which of these muscles may affect the borders of mandibular complete denture?

A. Mentalis

B. Lateral pterygoid

C. Orbicularis oris

D. Levator angularis

The correct answer is A. Mentalis.

The labial vestibule extends from the labial frenum to the buccal frenum. The mucolabial fold extends from the inner aspect of the lip to the mandible. The mentalis muscle inserts very close to the crest of the ridge in this area and limits the border extension in length and width.

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The minimal occlusal thickness of amalgam restoration for appropriate resistance to fracture is:

# The minimal occlusal thickness of amalgam restoration for appropriate resistance to fracture is:

A. 0.5 mm

B. 0.8 mm

C. 1.5 mm

D. 2.5 mm

The correct answer is C. 1.5 mm.

The relatively horizontal pulpal and gingival walls, prepared perpendicular to the tooth’s long axis, help the restoration resist occlusal forces and limit the likelihood of tooth fracture from wedging effects caused by opposing cusps. It may be necessary to reduce cusps that no longer have sufficient dentin support and cover (or envelope) them with an adequate thickness of restorative material in order to provide resistance to fracture of the tooth and/or the restorative material. Preparation design must allow for adequate thickness of polycrystalline restorative materials to ensure adequate primary resistance to restoration fracture. he minimal occlusal thickness, for appropriate resistance to fracture, of amalgam is 1.5 to 2 mm and glass-ceramic is 2 mm. Polymeric restorative materials (e.g., composite resins) have no minimal thickness.

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Primer is a:

 # Primer is a:

A. Acid etching agent

B. Adhesion promoting agent

C. Coupling agent

D. Bonding agent

The correct answer is B. Adhesion promoting agent.

PRIMERS are hydrophilic monomers, which are applied over the etched/conditioned surfaces for the easy flow of bonding agents. Eg. 2-HEMA and HEMA dissolved in acetone or alcohol.

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Localized defects of the teeth can be treated by using:

 # Localized defects of the teeth can be treated by using:

A. Full veneers

B. Microveneers

C. Partial veneers

D. Macroveneers

The correct answer is C. Partial veneers.

A veneer is a layer of tooth-colored material that is applied to a tooth to restore localized or generalized defects and intrinsic discolorations. Typically, veneers are made of directly applied composite, processed composite, porcelain, or pressed ceramic materials. Common indications for veneers include teeth with facial surfaces that are malformed, discolored, abraded, or eroded or have faulty restorations.

Two types of esthetic veneers exist: (1) partial veneers and (2)full veneers. Partial veneers are indicated for the restoration of localized defects or areas of intrinsic discoloration. Full veneers are indicated for the restoration of generalized defects or areas of intrinsic staining involving most of the facial surface of the tooth. 

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Pulp is necrotized in which of the following?

 # Pulp is necrotized in which of the following?

A. Acute or chronic periapical abscess

B. Acute irreversible pulpitis

C. Hyperemia of pulp

D. Pulp polyp

The correct answer is A. Acute or Chronic periapical abscess.

A diagnosis may be confirmed by means of the electric pulp test and by thermal tests. The affected pulp is necrotic and does not respond to electric current or to application of cold. The tooth may be tender to percussion, or the patient may state that it hurts to chew with the tooth, the apical mucosa is tender to palpation, and the tooth may be mobile and extruded.

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