Dental Materials BDS Question Paper : tmu.ac.in

Name of the College : Teerthanker Mahaveer Dental College & Research Centre
Degree : BDS
Subject Code/Name : BDS203/Dental Materials
Year : II
Document Type : Model Question Paper
Website : tmu.ac.in

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Dental Materials Modal Question Paper :

SUPPLEMENTARY BDS 2nd PROFESSIONAL EXAMINATION 2009-10
Course Code: BDS203
Paper ID:0312103

Related : Teerthanker Mahaveer Dental College & Research Centre General & Dental Pharmacology & Therapeutics BDS Question Paper : www.pdfquestion.in/4623.html

Time: 3 Hours
Max Marks: 70
Note: 1. Attempt all questions from Part A and Part B. Each Part Carry 35 Marks. Draw proper diagrams to support your answer. 2. Use separate answer book for Part A and Part B.
Part A :
1. Classify impression materials. What are the ideal properties of impression material? Compare reversible and irreversible hydrocolloids. (8)
2. Classify direct filling gold. Discuss gold foil in detail. (8)
3. Write short notes on: (3×3=9)
(a) Dentin bonding agents
(b) High cupper amalgam
(c) Sprue.

4. Attempt following multiple choice questions: (2×5=10)
(a) Phenomenon common to ZOE and polycarboxylate cement is:
(i) Acid base reaction (ii) Cross linking
(ii) Chelation (iv) Polymerizaion

(b) Contact angle should be ______degrees for proper wetting:
(i) Zero degree (ii) 45 degrees
(ii) 60 degrees (iv) 90 degrees

(c) Which of the following impressions can be most safely transported to the dental laboratory?
(i) Polysuphides (ii) Addition sillicones
(ii) Condensation silicones (iv) Alginates

(d) Excessive monomer in acrylic resin results mainly in:
(i) Excessive expansion (ii) Excessive shrinkage
(ii) Increased strength (iv) Increased porosity

(e) Area under complete stress strain curve provides:
(i) Modulus of elasticity (ii) Toughness.
(ii) Modulus of resilience (iv) Proportional limit

Part B :
1. Classify dental casting alloys. What are the desirable properties of dental casting alloys? Write in brief about the heat treatment of gold casting alloys. (8)
2. Classify resin based composites. Write application, properties and composition of composite restorative materials. (8)
3. Write short notes on: (3×3=9)
(a) Trituration in Amalgam
(b) Acid etch technique
(c) Heat activated vs chemically activated acrylic resins.

4. Attempt following multiple choice questions: (2×5=10)
(a) Time dependent plastic deformation of a material is called:
(i) Creep (ii) Viscosity
(ii) Flow (iv) Elasticity

(b) Investment material used for base metal alloys is:
(i) Gypsum bonded investment
(ii) Phosphate bonded investment
(iii)Silicate bonded investment
(iv)All of the above

(c) Maximum flow permitted for type B inlay wax at 37°C:
(i) 1% (ii) 25%
(ii) 50% (iv) 70%

(d) Purpose of adding Indium to metal alloy in porcelain fused to metal is:
(i) To improve bonding
(ii) To increase strength
(iii)To decrease porosity
(iv)To match thermal expansion of porcelain and metal

(e) In visible light cure composites activation is achieved by:
(i) N-N-P toluidine
(ii) Camphoroquinone
(iii)Benzoyl methylether
(iv)Bisphenol-A

BDS 2nd PROFESSIONAL EXAMINATION 2009-10
Part A :
1. Classify gypsum product? Write in detail about dental stone. (8)
2. Enumerate various steps involved in Casting? Discuss in detail types and causes of casting defects. (8)
3. Write short notes on: (3×3=9)
(a) Die materials
(b) Glass lonomer cements
(c) Proportional limit, Elastic limit and Yield strength.

4. Attempt following multiple choice questions: (2×5=10)
(a) Which of the following components of alginate impression material may be a possible health hazard?
(i) Alginic acid (ii) Triethanol amine
(ii) Silica (iv) None of the above

(b) The gelation temperature of agar hydrocolloid impression material should be
(i) Far below the oral temperature
(ii) 37-45° C
(iii) 45-60° C
(iv) 10° higher than the mouth temperature

(c) Sometimes a die larger than the prepared tooth is desired to aid in compensating for the
(i) Casting shrinkage
(ii) Dimensional change of the impression
(iii)Warpage of the wax pattern
(iv)Expansion of the mold

(d) When m ixing dental stone, if the water powder ratio isincreased, the
(i) Compressive strength is increased
(ii) Surface hardness is increased
(iii)Setting time is decreased
(iv)Setting expansion is decreased

(e) The primary corrosion products of amalgam are:
(i) Silver chloride or fluoride
(ii) Copper sulphate
(iii)Oxides and chlorides of tin
(iv)Zinc and silver dioxide