Dentosphere : World of Dentistry

 # The type of patient demanding to be educated before the complete denture fabrication: A. Philosophical B. Exacting C. Indifferent D. Hysterical The correct answer is B. Exacting. Exacting patients are precise in everything they do. They are immaculate in dress and appearance. Their nature is to be satisfied only by perfection. They may demand that the dentist explain every step of the treatment in detail. These patients should not be promised that they will be able to wear a prosthesis without any inconvenience, because they will expect the dentist to live up to such promises. Potential problems and inconveniences should be explained in detail before treatment is initiated. CLICK HERE FOR MORE MCQs

 # The primary function of posterior palatal seal is to: A. Retention of upper denture by making a complete seal B. Aid in insertion and removal of the upper denture C. Achieve balanced occlusion D. Retention of lower denture The correct answer is A. Retention of upper denture by making a complete seal. The primary purpose of PPS is the retention of the maxillary denture. PPS creates a partial vacuum beneath the maxillary denture. This partial vacuum is activated only when horizontal or tipping forces are directed against the denture base. The duration of this vacuum is small and so little or no irreversible alterations to the underlying mucosa will take place. CLICK HERE FOR MORE MCQs

 # Face bow is used to record: A. Orientation relation B. Centric relation C. Eccentric relation D. Vertical jaw relation The correct answer is A. Orientation relation. The maxillary cast is attached to the articulator using the orientation jaw relation records. The procedure of transferring the orientation relation to the articulator is called face-bow transfer. Orientation jaw relation is defined as: “the jaw relation when the mandible is kept in its most posterior position, it can rotate in the sagittal plane around an imaginary transverse axis passing through or near the condyles”—GPT. CLICK HERE FOR MORE MCQs

 # Fixed factor according to Hanau is: A. Orientation of occlusal plane B. Condylar guidance C. Incisal guidance D. Compensating curve The correct answer is B. Condylar guidance. Increase in the condylar guidance will increase the jaw separation during protrusion. This factor of balanced occlusion cannot be modified. All the other four factors of occlusion should be modified to compensate the effects of this factor. In patients with a steep condylar guidance, the incisal guidance should be decreased to reduce the amount of jaw separation produced during protrusion and vice versa. But it should be remembered that the incisal guidance cannot be made very steep because it has its own ill effects. CLICK HERE FOR MORE MCQs

 # 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'.  CLICK HERE FOR MORE MCQs

 # 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. CLICK HERE FOR MORE MCQs

 # 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. CLICK HERE FOR MORE MCQs

# 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) hav...

 # 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. CLICK HERE FOR MORE MCQs

 # 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.  CLICK HERE FOR MORE MCQs

 # 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. CLICK HERE FOR MORE MCQs

  1. Cavosurface margin angulation in chamfer finish line is: A. Always 90 degree B. 90 degree or less than 90 degree C. 90 degree or more than 90 degree D. 120 degree 2. The midline fracture of the maxillary denture are mainly due to: A. Teeth set too buccally B. No midline relief C. Ridge resorption D. All of the above 3. Indirect retainers of partial denture: A. Engages undercut areas B. Most effective when close to direct retainer C. Must be constructed with flexible materials like plastics D. Should resist rotator forces about fulcrum 4. The advantage of metal base denture is: A. Increase in tissue tolerance B. Easy laboratory procedure C. Rebasing and relining are quite easy D. Increase in restorative cost 5. Bilateral balanced occlusion concept is given by: A. Von Spee and Manson B. GV Black C. D Van D. Sturdevant 6. With the increase of age, keratinization of gingiva: A. Increases B. Decreases C. Remains same D. No...

# Infancy and childhood are dynamic periods of: A. Dentition B. Growth and development C. Head and face D. Habits # Developmental milestone provide a framework for observing and monitoring: A. Child B. Elderly persons C. None of the above D. All of the above # What plays a role in development of children? A. Parent and sibling personalities B. Family socioeconomic status C. Caregivers nurturing methods D. None of the above # Reflexes enables the infant to make purposeful: A. Movements B. Support C. Development D. None of the above # Equilibrium in infants begin for walking by: A. 6 months B. 2 months C. 4 months D. 12 months #  Additional equilibrium responses develop during: A. 2nd year B. 4th year C. None of the above D. All of the above #  In infants movement of hands and feet is dominated by: A. Primitive grasp reflex B. Firm grasp C. None of the above D. All of the above # Palmar grasp develops in which age: A. 7 months B. 2 months C. 4 months D. None of the above # Pince...