Review Questions for Dentistry

Hugh Devlin

• Publisher: Wiley-Blackwell
• Year: 2016
• ISBN:
  9781118815038
• Edition: 1
• Topic: Medicine
• Subtopic: Dentistry

Review Questions for Dentistry is an essential exam practice tool designed for undergraduate dentistry students, postgraduate MJDF candidates, and overseas candidates sitting their OREs. Using the questions as a platform for learning consolidation, this exam preparation guide provides feedback to students to enable them to assess their knowledge and understanding of the subject.

• Features multiple question formats including MCQs, EMQs, SAQs and find the missing word questions
• Answers include detailed explanations to help expand and consolidate learning
• The text is divided into two sections; introductory questions and questions exploring the subjects in more detail
• The book is accompanied by a companion website offering further interactive self-assessment tools

Section 1
Questions testing the introductory aspects of the subject

Chapter 1
Endodontics

Questions

1. The ideal position for the access cavity in anterior maxillary teeth should
   1. conserve as much of the pulp chamber roof as possible
   2. be positioned close to the incisal edge
   3. be positioned over the cingulum of the tooth
   4. be positioned to allow access to the apical region of the root canal
   5. utilise any existing cervical labial restorations to avoid any further damage to the tooth
2. Choose the option which correctly completes this sentence. The working length can be defined as the distance from a reference point on the crown of the tooth
   1. to the cemento-dentinal junction of the root apex or apical constriction
   2. to the anatomic root apex
   3. to a point about 2.5 mm short of the radiographic apex
   4. to the enamel-dentine junction
   5. to the radiographic apex
3. An apex locator is an electrical device which is used to measure the working length. This device works using
   1. magnetic flux
   2. electrical conductance
   3. electrical Impedance
   4. light
   5. solar energy
4. A Gates-Glidden bur is used to prepare
   1. the apical third of a root canal
   2. the apical third of a root canal when it is particularly curved
   3. the access cavity
   4. the coronal two-thirds of the root canal
   5. the apical root canal when a file cannot be negotiated to the working length
5. During root canal treatment which description best describes the phenomenon of ‘apical transportation of the root canal’ or ‘zipping’?
   1. Where the original shape of the root canal is preserved
   2. Where a strip perforation occurs near the coronal end of the canal
   3. An apical perforation
   4. A lateral perforation
   5. The file tends to straighten out during preparation of curved canals with uneven enlargement of the apical part of the canal
6. An initial ‘glide pathway’ in endodontics is created using
   1. rotary endodontic instruments
   2. anti-curvature filing
   3. frequent irrigation
   4. manual preparation to a no.10 ISO size file
   5. EDTA (ethylenediaminetetraacetic acid)
7. Temporary obturation of the access cavity may be necessary between appointments. Which is the material that provides the best seal?
   1. Coltosol F (Coltene Whaledent), which is a non-eugenol temporary filling material
   2. Fermit (Ivoclar vivadent), which is a resin-based material
   3. IRM (Caulk/Densply, USA), which is a reinforced zinc oxide/eugenol material
   4. Cotton wool with a 2 mm covering layer of Cavit temporary filling material
   5. Cotton wool plug
8. Complete the following sentence. The endodontic access cavity in an upper first molar is centred over
   1. the disto-occlusal aspect of the tooth
   2. the palato-occlusal aspect of the tooth
   3. the mesio-palatal cusp
   4. the mesio-occlusal aspect of the tooth
   5. any existing restorations to avoid further iatrogenic damage to the tooth
9. Various solutions have been used as endodontic irrigants. Which of the following solutions is the most cost-effective endodontic irrigant?
   1. 2.25% sodium hypochlorite
   2. 2% chlorhexidine
   3. Sterile saline
   4. Local anaesthetic solution
   5. Sterile water
10. The placement of a satisfactory root canal filling has been completed, but it is recommended to radiographically review the endodontic treatment to determine if healing has taken place. Complete the following sentence. Root canal treatment should be reassessed radiographically
    1. at 3 months after the initial treatment
    2. at 6 months after the initial treatment
    3. at 9 months after the initial treatment
    4. at 1 year after the initial treatment
    5. at 2 years after the initial treatment
11. Choose the option which correctly completes the following sentence.
    In internal root resorption
    1. the typical appearance on a periapical radiograph involves an ovate, often symmetrical, widening of the root canal
    2. cone beam computerised tomography (CBCT) has no place in the diagnosis of these lesions due to the high radiation dose
    3. the affected teeth are painful in the early stages, and pain is often the presenting symptom
    4. surgical endodontic therapy is the preferred treatment option in most cases
    5. the lesion can be monitored as spontaneous repair can occur
12. What is the prevalence of a second canal in the mesiobuccal root of the permanent maxillary first molar?
    1. Between 5 and 10% of these teeth
    2. Between 11 and 20% of these teeth
    3. Between 21 and 30% of these teeth
    4. Between 30 and 40% of these teeth
    5. Over 50% of these teeth
13. AH Plus® (Dentsply International) is a typical, modern endodontic sealer material. Choose the best option from the following statements which describe the properties of this material.
    1. It has very good dimensional stability
    2. It tends to discolour the tooth
    3. It is radiolucent
    4. It has poor tissue compatibility
    5. It tends to release formaldehyde
14. Of the following options, the best definition of ‘apexification’ is that it
    1. is normal development of the vital root
    2. involves inducing a calcified wall at the apex of a non-vital tooth
    3. is vital pulp treatment
    4. is vital pulp treatment involving normal physiological root development
    5. has the same definition as ‘apexogenesis’
15. There is a small swelling in the labial sulcus associated with a carious, non-vital upper left central incisor. The swollen area and tooth are painful to touch. What is your diagnosis and immediate treatment?

Answers

1. Correct answer D: The ideal position of the access cavity is midway between the incisal edge and the cingulum, which will allow the least restricted access to the apical region of the root canal. A pre-operative radiograph is often helpful in obtaining the correct bur angulation. The access cavity should be smooth without any overhanging dentine.
2. Correct answer A: The cemento-dentinal junction (or apical constriction) is the ideal position for location of the apical reference point (see Pratten, D.H. and McDonald, N.J. Comparison of radiographic and electronic working lengths. J. Endod., 1996, 22: 173–6). Electrical apex locators are being increasingly used as they provide a more accurate determination of the working length than radiographic methods. These instruments detect the apical constriction, which is the boundary between the pulpal and periodontal tissues. The location of the apical constriction varies between 0.5 and 2 mm from the radiographic apex.
   Traditionally, the cemento-dentinal junction and the apical constriction have been thought of as being coincident; however, this is not always true (see Hassanien, E.E., Hashem, A. and Chalfin, H. Histomorphometric study of the root apex of mandibular premolar teeth...

Table of contents

• Cover
• Title Page
• Copyright
• Table of Contents
• About the companion website
• Introduction
• Section 1: Questions testing the introductory aspects of the subject
• Section 2: Questions exploring the subjects in more detail
• Further reading
• Index
• End User License Agreement