10 Questions
What is the undesirable property of amalgam filling material for posterior teeth?
It changes shape permanently when subjected to heavy biting force
What is the purpose of expansion in investment material for dental casting?
To compensate for the contraction of molten metal after cooling
Why is high water absorption undesirable in dental materials?
It can lead to unhygienic conditions and dimensional changes
What is the unit of measurement for solubility of dental materials?
µg/mm²
Why is density an important consideration in restorative materials?
It affects the weight and mobility of the restoration
Match the following materials with their coefficient of thermal expansion (α) in dentistry:
Tooth = 1110-6 cm/cm°C Gold = 1410-6 cm/cm°C Impression compound = 250*10-6 cm/cm°C
Match the following clinical importance with the correct reason:
Preventing marginal leakage = To prevent pressure on the pulp or pull away from the cavity wall Providing metal ceramic bonding = To avoid crazing of artificial tooth and denture base Maintaining 2-dimensional stability = To prevent breakage of marginal seal between the filling and the cavity wall Avoiding recurrent caries = To prevent discolouration and hypersensitivity
Match the following materials with their coefficient of thermal expansion ranking in dentistry:
Hard tooth structure = Smallest Metals = Intermediate Polymers = Largest
Match the following consequences with the correct cause:
Marginal leakage = Difference in coefficient of thermal expansion between tooth and restorative materials Discolouration = Poor metal ceramic bonding Recurrent caries = Crazing of artificial tooth and denture base Hypersensitivity = Breakage of marginal seal between the filling and the cavity wall
Match the following requirements with the correct material property:
Dimensional stability = To prevent changes in shape after setting Coefficient of thermal expansion = To prevent marginal leakage and recurrent caries 2-dimensional stability = To prevent changes in shape after hardening No dimensional changes after setting = To prevent breakage of marginal seal between the filling and the cavity wall
Dental materials is the science that deals with materials used in dentistry, their properties and manipulation for proper selection and use by dentists. Learn about the history of dentistry and restorative materials.
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