Free Restorative Materials MCQs with Answers

• A. Higher solubility in saliva
• B. Lower modulus of elasticity
• C. Esthetic excellence
• D. Lower thermal co-efficient of expansion

Explanation: Inorganic filler particles reduce the resin matrix's thermal expansion, making the composite behave more like tooth structure and reducing…

• A. Resin & Filler
• B. Filler
• C. Resin
• D. None

Explanation: A dental composite is a resin matrix reinforced with filler particles, usually inorganic glass or ceramic.

• A. Organic acid-metal oxide
• B. Diketone-amine
• C. Organic acid-peroxide
• D. Peroxide-amine

Explanation: Light-cured composites use a diketone photosensitizer, commonly camphorquinone, with an amine co-initiator.

• A. Gold alloy
• B. Colloidal silica
• C. A filled resin
• D. Wax

Explanation: A composite contains at least two distinct phases, such as a resin matrix reinforced with inorganic filler, so filled resin is the…

• A. Iritis
• B. Cataract
• C. Conjunctivitis
• D. Retinal damage

Explanation: The intense blue light used for curing composites can damage the retina, particularly with prolonged or unprotected exposure.

• A. Covalent bond
• B. Mechanical
• C. Ionic bond
• D. Vanderval forces

Explanation: Composite resin retention to etched enamel and dentin is mainly micromechanical: resin penetrates surface irregularities and forms resin…

• A. Stainless steel
• B. Plastic
• C. Iron
• D. None of the above

Explanation: A plastic spatula is used for mixing composite because it reduces the risk of incorporating metal particles and avoids abrasion of the…

• A. 0.05 to 0.04mm
• B. 0.5 to 1.0 microns
• C. 0.01 to 0.1 microns
• D. 0.3 to 0.4mm

Explanation: Microfilled composites use extremely small colloidal silica particles, commonly about 0.01 to 0.1 microns.

• A. Compound
• B. Complex material
• C. Combined
• D. Composite

Explanation: A composite combines two or more distinct materials, usually a resin matrix and inorganic filler, while retaining separate phases and…

• A. Are practically insoluble in oral fluids
• B. Prevent galvanic action
• C. Adapt to the walls of the cavity better
• D. Have a higher coefficient of thermal expansion

Explanation: Composite resin is practically insoluble in oral fluids, whereas silicate cement is more vulnerable to oral-fluid dissolution.

• A. Increase the surface area
• B. Permit chemical bonding between resin and enamel
• C. Create surface irregularities in enamel for better mechanical retention of resin
• D. Condition the tooth surface for better wetting

Explanation: Acid etching produces microporosities, increases effective surface area, and improves wetting, allowing micromechanical retention.

• A. Glass ionomer restoratives
• B. Hybrid resin composites
• C. Macrofilled resin composites
• D. Microfilled resin composites

Explanation: Microfilled composites provide the smoothest surface and best polish retention because their very small filler particles produce high…

• A. Microfilled resin
• B. Macrofilled resin
• C. Hybrid
• D. Light cure activated

Explanation: Microfilled composites contain a greater proportion of resin matrix, and the matrix absorbs more water than inorganic filler.

• A. Composites
• B. Unfilled resins
• C. Amalgam
• D. Polycarboxylate

Explanation: Unfilled resin undergoes marked polymerization shrinkage because it contains a high proportion of monomer, leaving marginal gaps that…

• A. Nd:YAG
• B. CO2
• C. Argon
• D. ER:YAG

Explanation: Argon laser emits blue-green light that can activate photoinitiators in composite resin, so it was used for light curing.

• A. Parabane
• B. Ligane
• C. Chelane
• D. Silane

Explanation: Silane is an organosilicon coupling agent that chemically links the inorganic filler surface to the organic resin matrix.

• A. Separate etching step is still required
• B. Separate etching step not required
• C. 4th generation bonding agents
• D. Contains only primer

Explanation: A one-bottle adhesive combines primer and bonding resin, but in the conventional fifth-generation etch-and-rinse system a separate…

• A. Decrease coefficient of thermal expansion
• B. Decrease polymerization shrinkage
• C. Decrease micro leakage
• D. Decrease porosity in restorative material

Explanation: Acid etching creates microporosities and increases surface energy, allowing resin to penetrate enamel and form micromechanical retention…

• A. 200 um - 250 um
• B. 3 um - 9 um
• C. 50 um - 110 um
• D. 10 um - 20 um

Explanation: Thirty seconds of phosphoric-acid etching produces a relatively shallow micromechanical retention pattern in enamel, commonly around 10–20…

• A. Quartz
• B. Silicates
• C. Zinc particles
• D. Aluminium

Explanation: Quartz is a common inorganic filler in composite resin and improves strength, wear resistance and stiffness while reducing polymerization…