DTRBN Profressional Examination Past Questions Free Download

DENTAL TECHNOLOGIST REGISTRATION BOARD
OF NIGERIA

https://stcharlesedu.com
JUNE 2021 QUALIFYING PROFESSIONAL EXAMINATION

Subject Title: Dental Laboratory Techniques

Date: Mon. 7th June, 2021

Time: 2.00pm – 5.00pm

INSTRUCTIONS
Attempt All Questions in Section A and
THREE ONLY IN SECTION B

© 2021 Dental Technologies Registration Board of Nigeria

SECTION A (2mks)
1. Give a description of a Richmond crown

2 Mention the three basic qualities of a noble metal (1.5mks)

3. Why should a partial denture be referred to as a biomaterial? (2mks)

https://stcharlesedu.com4. What is spoon denture and in what situation may it be used?(2mks)

5. Mention four (4) functions of a partial denture. (2mks)

6. State 4 primary roles of sprues in metallic casting procedures. (2mks)

7. Give four reasons why a dental model should be surveyed. (2mks)

8. In the process of teeth selection for the replacement of lost natural teeth,

state three (3) factors to be considered. (1.5mks)

9. Why should gypsum refractory mould be heated before caning in metals. (2mk)

10. Define class II Maloclussion (2mks)

11. Mention four types of denial bridges that can be fabricated in (2mks)
the laboratory

12. Which of the following is correct in the functions of the constituents? (1mk)
that compose gypsum bonded investment materials?
(a) Alpha hemihydrates regulate thermal expansion.
(b) Silica acts as a refractory during heating
(c) Modifiers binds and holds the silica particles together
(d) Modifying chemicals are gold and silver

13. Oral cavity that is having one healthy natural standing tooth with

others missing can be referred as

(a) complete edentulous (b) partial edentulous

(C) fixed edentulous (d) transit edentulous

14. What is a soft splint? (1 mk)
(2mks)

SECTION B
Answer Question 1 and any other 2 Questions

1 a. Mention and briefly define the classifications of removable partial (9mks)
denture (16mks)
b. With a well labeled diagram, explain in details the classification
based on arch configuration.

2 a. List any 3 materials used in the construction of customized (5mks)
impression trays. (20mks)
b. Describe the construction of a spaced upper special tray using
acrylic resin.
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3 a. What is an undercut? (2mks)
b. Mention and explain types of undercut (8mks)
c. Explain in details the factors that affect the retention of a partial
denture. (I5mks)

4 a. Define the term "Lost wax process". (5mks)
b. Explain its importance in metal casting. (5mks)
c. Name a suitable investment material used in metal casting,
their properties and compositions (5mks)
d. Mention any 5 ideal properties of investment material (l0mks)

5 a. Mention and explain denial irregularities. (7mks)

b. List ten (10) orthodontic appliances that could be used for correcting

dental irregularities. (l0mks)

c. Mention one appliance for the correction of the following terms as it

relates to bad habits:

i Thumb-sucking ii Tongue thrusting

iii. Mai breathing iv. Bruxism (8mks)

Dental Technologies Registration Board
of Nigeria DTHRBN Qualifying
Professional Examination Past
Questions

DTHRBN Professional Examination Past Questions Paper
SECTION A & B Feature

Total Time Allowed: 3 hours
Total Marks: 150 (Section A: 25 Marks | Section B: 125 Marks)

Section A: Essay Questions 1 – 12, 13, 14 or 16
Section B: Essay Questions 1 – 5

See below list of DTHRBN Exam Past Questions Paper Courses Available for Download.

01. Dental Laboratory Techniques DLT
02. Oral Anatomy and Physiology OAP
03. Dental Material Science DMS
04. General Paper GP
05. Practical

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