Questions and Answers
A sectional matrix requires a traditional retainer to fit properly.
False
Contouring a tofflemire matrix band ensures proper contact with adjacent teeth.
True
A mylar matrix system is appropriate for Class 3 restorations.
True
The smaller circumference of a tofflemire matrix band should be placed toward the buccal side.
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The definition of general supervision allows the dentist to be out of the office while a procedure is being performed.
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The universal tough Tofflemire system provides the best support for extensive restorations.
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A registered dental assistant in extended functions needs to complete additional continuing education to renew their orthodontic assistant permit.
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In California, an unlicensed dental assistant can perform placing or finishing permanent restorations under general supervision.
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Stainless steel matrix bands are preferred for anterior composite restorations to avoid scratching the resin.
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Class 2 cavity classification refers to decay on the mesial or distal surfaces of incisors and canines.
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The RDAEF must complete three hours of dental practice act continuing education to renew their license every year.
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Occlusion describes the relationship between the mandible and the maxillary teeth when they are aligned.
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A registered dental assistant is allowed to dry endodontically treated canals.
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A universal retainer is also known as a circumferential matrix band.
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An unlicensed dental assistant is allowed to obtain a face bow transfer and a bite registration.
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Correspondence courses are limited to 15% of the total required units needed for license renewal.
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The hybrid layer is a small layer of uncured material that remains after a composite resin is polymerized.
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Compressive force refers to the force applied when two surfaces slide against each other in opposite directions.
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Glass ionomer is known for its ability to release fluoride, which can help in arresting tooth decay.
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Microfilm composite materials are the most suitable for stress-bearing tooth surfaces.
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The primary purpose of dentinal bonding is to provide sealed margins.
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Class 5 classification identifies the presence of caries at the gingival third of the facial or lingual surface of a tooth.
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The amount of thermal contraction is irrelevant when using resin or composite based restorative materials.
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Viscosity describes whether a material is thick or thin.
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Hydrochloric acid is the most commonly used etchant for tooth bonding, usually in concentrations of 5% to 10%.
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A poorly placed restoration can lead to a fracture within the restoration due to inadequate adaptation and thermal expansion.
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Non-impregnated gingival retraction cord contains a chemical agent to displace gingival tissue.
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Chemically treated gingival retraction cord contains an astringent to help control bleeding.
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Aluminum chloride in Hemodent gingival retraction cord can produce undesirable cardiovascular effects.
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Study Notes
Matrix and Restorative Procedures
- Sectional matrix fits on one proximal surface, utilizing mesial or distal walls, and doesn't need a traditional retainer.
- Proper contouring of a Tofflemire matrix ensures correct contact with adjacent teeth.
- An improperly contoured matrix band minimally affects the integrity of contact points.
- For Class 3 restorations on maxillary central incisors, a Mylar matrix system is appropriate.
- During Tofflemire band assembly, smaller circumference edges are positioned toward the gingiva.
- The universal Tofflemire system supports large restorations effectively.
- Stainless steel matrix bands can scratch resin in anterior composite restorations, interfering with resin setting.
Dental Assisting and Licensure
- General supervision allows a dentist to be absent during a procedure.
- Dental assisting duties and supervision levels vary by state law; RDAEF requires direct supervision.
- In California, RDAEFs must complete three hours of dental practice act CE for license renewal every two years.
- Correspondence courses are accepted for up to 25% of total CE units for license renewal.
- Unlicensed dental assistants can place, finish, and remove permanent restorations under general supervision.
- Registered dental assistants need not complete additional CE for orthodontic permits.
Cavity Classification and Dental Forces
- Class 2 cavities are located on the mesial or distal surfaces of incisors and canines.
- Occlusion describes the interrelation of mandible and maxillary teeth when closed.
- Retrusion refers to the backward position of the mandible concerning the maxilla.
- Black’s classification categorizes caries to pinpoint decay locations and restoration methods; Class 2 pertains to premolar or molar occlusal surfaces.
- Class 5 cavities occur at the gingival third of facial or lingual surfaces.
Resin and Composite Materials
- Understanding thermal expansion of resin-based materials is crucial for restorations.
- Adhesion refers to mechanical retention methods in restorative procedures.
- Viscosity denotes the thickness or thinness of materials used.
- Poorly placed composite restorations may lead to fractures, requiring careful application to avoid microleakage.
- Hydrochloric acid is the common etchant for bonding, in 10% to 38% concentrations.
Bonding and Gingival Retraction
- Hardened resin bonding agents form mechanical and chemical bonds with teeth and subsequent resin layers.
- Acid etching enhances surface energy and contact angles for better bonding.
- The smear layer must be removed to achieve effective dentin bonding.
- Gingival retraction manages bleeding and captures detail for impressions during indirect restorations.
- Non-impregnated retraction cords displace tissue mechanically, while chemically treated cords contain astringents to control bleeding.
Composite Materials and Applications
- Hemodent retraction cord with aluminum chloride aids hemostasis without adverse cardiovascular effects.
- During polymerization of composite resin, an uncured layer termed the hybrid layer remains.
- Tooth structure responds differently to compressive, tensile, and shearing forces; compressive force is associated with squeezing.
- Sealed margins are the primary goal of dentinal bonding.
- Altering material ratios may adversely affect performance.
- Glass ionomer releases fluoride, effectively preventing decay, particularly in children.
Types of Composites
- Four primary composite types: hybrid, microfilm, nanofilm, and nanohybrid; microfilm is weakest and unsuitable for stress-bearing surfaces.
- Glass ionomer is the most effective material for decay prevention in pediatric dentistry.
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Description
This quiz focuses on specific dental materials and techniques related to sectional matrices and the use of tofflemire matrix bands in dental restorations. You'll explore the importance of proper contouring for achieving correct tooth contact and restoration integrity. Test your knowledge with our engaging questions!
