dental materials test two study flash cards
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| _____ is the deterioration of a metal by a chemical or electrochemical reaction | corrosion
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| what material is MOST OFTEN used for a temporary restoration? | ZOE
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| If excess cement is not removed from in and around the gingival margin and sulcus of the tooth, the cement can: | irritate the area and cause inflammation and discomfort
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| An undermixed dental amalgam will appear: | grainy
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| Amalgam has been popular for the restoration of carious teeth because | It is more economical than composites
It has excellent physical properties
It is easy to manipulate
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| The dental assistant may have the responsibility of placing the mixed cement in a crown. The cement should be loaded | so that a thin layer lines all the walls of the crown
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| what cement undergoes an exothermic reaction during mixing? | Zinc Phosphate
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| An) _____ is defined as a mixture of two or more metals. | alloy
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| Intermediate restorative material (IRM) is a | Zinc Oxide Eugenol Cement
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| What would be the material of choice as an insulating base as well as a sedative base? | Zinc Oxide Eugenol
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| Because ZOE has a neutral pH of 7 and contains eugenol, it is ____ to the pulp | Obtunding
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| A properly mixed amalgam should appear | As a homogenous mass with slight shine
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| Dental amalgam primarily consists of _____. | mercury, silver, copper, and tin
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| Protective bases are placed when it is necessary to protect the pulp before the restoration is placed, because without this protection there may be: | postoperative sensitivity and damage to the pulp.
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| _____ is added to dental amalgam alloy powder to suppress oxidation | zinc
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| What is the most important rule to follow when preparing dental cements | Follow the manufacturer's directions
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| Solid materials are able to maintain their shape and resist external forces. | true
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| The type of stress caused to teeth when biting a hard object, such as a piece of hard candy... | compression
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| The atomic bonding of liquids is stronger than that of gases but weaker than that of solids. | true
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| it is important to understand dental materials biocompatibility to: | Reduce the chance of pain after the placement of a composite restoration
Reduce the chance of toxicity
Reduce the chance of irritation to the patients gingiva
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| Metallic bonds have the _______ bond compared to ionic bonds and covalent bonds; because of the free movement of ____, metallic bonds conduct heat and electricity | strongest;electrons
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| The ability to transfer an electric current between two dissimilar metals is called___________. | Galvinism
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| When a materials deformation is not permanent and recovers it is considered to have good.... |
Elasticity
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| The ingestion of cold and hot fluids and food can cause repeated expansion and shrinkage of a restoration; producing the opening and closing of a gap between the tooth surface and the restoration. This is called _____________. | Percolation
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| The mechanical property of ____ refers to the weight or load applied to an object. | force
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| The basic atom contains protons and electrons within the nucleus and neutrons in orbit around the nucleus | false
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| The ability of a material to dissolve in a liquid refers to: | solubility
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| _______ is the deterioration of a metal by a chemical or electrochemical reaction. | Corrosion
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| ______________ is directly related to the breakdown of most restorative materials. | moisture, acid, and stress
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| If light will pass directly through an object it will be considered: | transparent
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| In dental materials , most materials combine two components consisting of a ________ and ________to form a resulting material. | Catalyst;Base
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| The uncured layer of resin on the surface of bonding agents and composites that allows for additional material to be added without the need for additional etching refers to the | Oxygen Inhibited Layer
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| Enamel bonding is not as strong as dentinal bonding | true
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| Enamel bonding is achieved by micromechanical retention | false
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| Enamel bonding is achieved by resin tags penetration porosities in the enamel and by locking into surface roughness | false
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| Enamel bonding is simpler than bonding to dentin. | false
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| Composite resins are often classified according to their | Filler Particle Size
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| The bonding agent within a composite is | Silane Coupling Agent
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| The acid used most commonly to etch tooth structure for bonding procedures is | Phosphoric
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| The conventional or traditional composites, which contain the largest filler particles and provide the greatest strength, are known as _____ composites | Macrofilled
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| __________ is the excess material that remains on the occlusal margin, sometimes described as feather like? | flash
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| The layer of debris (tooth structure, blood, saliva, etc.), similar to sawdust, created when preparing a tooth is referred to as the ______. | Smear Layer
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| The polymerization shrinkage of a composite | Can be minimized by placing and curing composite in small increments
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| The purpose of the silane coupling agent for composite resins is | To improve the bond between the filler particles and the resin matrix
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