Jane's Wiggs Chapter 17 and 18 - Operative Dentistry Flashcards
According to Wiggs Chapter 17 (Restorative Dentistry),
What class of lesion is this in GV Blacks modified cavity preparation classification system?
Class 1 - pit and fissure location, any tooth
According to Wiggs Chapter 17 (Restorative Dentistry),
What class of lesion is this in GV Blacks modified cavity preparation classification system?
Class 2 - lesions on proximal surfaces ***ONLY MOLARS AND PREMOLARS***
According to Wiggs Chapter 17 (Restorative Dentistry),
What class of lesion is this in GV Blacks modified cavity preparation classification system?
Class III - Proximal surface, not including incisal edge *** ONLY INCISORS AND CANINES*
According to Wiggs Chapter 17 (Restorative Dentistry),
What class of lesion is this in GV Blacks modified cavity preparation classification system?
Class IV - lesions of the proximal surface involving the incisal edge ***ONLY CANINES AND INCISORS***
According to Wiggs Chapter 17 (Restorative Dentistry),
What class of lesion is this in GV Blacks modified cavity preparation classification system?
Class V - Facial and lingual surfaces of all teeth, excludes pits and fissures
According to Wiggs Chapter 17 (Restorative Dentistry),
What class of lesion is this in GV Blacks modified cavity preparation classification system?
Class VI - defect of the incisal edge or cusp on any tooth (not in GV blacks original classification)
Careful to differentiate from class IV - proximal between incisors or canines, but affecting the incisal edge
According to Wiggs Chapter 17 (Restorative Dentistry),
What are the three categories, and what does each mean in the ELEMENTARY CAVITY CLASSIFICATION?
Simple - one wall affected
compound - two walls affected
complex - three walls affected
According to Wiggs Chapter 17 (Restorative Dentistry),
How many dentinal tubules are there per square mm of SURFACE dentin?
30,000 - 40,000
According to Wiggs Chapter 17 (Restorative Dentistry),
Compare and contrast pulp a-delta and c-fibres with regard to size, myelin, speed of conduction and type of pain
A delta: Large, myelinated, fast conduction, sharp pain
C-fibres: Small, non- or minimally myelinated, slower conduction, dull, throbbing, acching pain
According to Wiggs Chapter 17 (Restorative Dentistry),
According to Brannstrom, what is suspected to be the main cause of eliciting dental pain?
Rapid flow of fluid in dentinal tubules
According to Wiggs Chapter 17 (Restorative Dentistry),
Name the cell layers inside the tooth pulp, beginning at the dentin and moving inwards
Odontoblast layer
Cell free zone (of Weil)
cell rich zone (of Hohl)
pulp core (not mentioned in Wiggs, but mentioned elsewhere)
According to Wiggs Chapter 17 (Restorative Dentistry),
What is sclerotic dentin?
Dentin that is more highly mineralized in response to a dead tract (unoccupied tubule) left vacant by a dead odontoblast.
According to Wiggs Chapter 17 (Restorative Dentistry),
What is a clinical sign of sclerotic dentin visible to the naked eye?
highly translucent dentin
According to Wiggs Chapter 17 (Restorative Dentistry),
What are they two types of tertiary dentin, and what is the difference?
Reactionary - made by an existing odontoblast in response to an insult
Repairative - newly differentiated odontoblast-like cell from a local stem cell precursor
According to Wiggs Chapter 17 (Restorative Dentistry),
Name the walls of the cavity prep depicted by each letter.
Uses human terms, substitue bucal for facial.
Best way for me to remember is that wall is named for what it’s made out of…
According to Wiggs Chapter 17 (Restorative Dentistry),
What is the difference between a line angle and a point angle?
Line angles are where 2 walls intersect, point angles are where 3 walls intersect.
According to Wiggs Chapter 17 (Restorative Dentistry),
Name the following line and point angles.
angles are named by the 2 or 3 surfaces that make them
According to Wiggs Chapter 17 (Restorative Dentistry),
Which is considered more important in modern dentistry: extension for prevention or conservation of tooth structure?
conservation of tooth structure. Extension for prevention is dead.
According to Wiggs Chapter 17 (Restorative Dentistry),
Name all of the forms (7) in G.V. Blacks cavity preparation steps:
- Outline form
- Resistance form
- Retention form
- Convenience form
- Pathology removal form
- Wall form
- Preparation cleansing form
According to Wiggs Chapter 17 (Restorative Dentistry),
Describe the outline form for cavity preparation
establishing the external and internal dimensions of the preparation
According to Wiggs Chapter 17 (Restorative Dentistry),
Describe the resistance form for cavity preparation:
Shaping the preparation to Resist fracture of the material and tooth
According to Wiggs Chapter 17 (Restorative Dentistry),
Describe the retention form for cavity preparation
Design of the preparation so that the restorative material stays put. (i.e. undercuts etc for non-adhesive materials)
According to Wiggs Chapter 17 (Restorative Dentistry),
Describe the convenience form for cavity preparation:
Shaping the preparation for ease of access in placement, shaping and finishing
According to Wiggs Chapter 17 (Restorative Dentistry),
Describe the Pathology removal form for cavity preparation:
shaping the prep to remove all diseased dental material.
According to Wiggs Chapter 17 (Restorative Dentistry),
Describe the wall form for cavity preparation:
refinement in shaping to remove all unsupported enamel rods, and smooth rough outlines
According to Wiggs Chapter 17 (Restorative Dentistry),
Describe the preparation cleansing form for cavity preparation:
Final shaping and removal of debris etc before placing restoration
According to Wiggs Chapter 17 (Restorative Dentistry),
What is a pulp capping material and when is it indicated?
What is the difference between direct and indirect pulp capping?
At what distance from the pulp should indirect pulp capping be performed
a medicament placed over the pulp area. Use MTA or CaOH.
indirect capping is if the pulp has not quite been exposed. Direct capping is when the pulp has been exposed.
within 0.5 mm of the pulp pulp capping amterial should be placed
According to Wiggs Chapter 17 (Restorative Dentistry),
What is the chemical reaction on which most light cure products are based?
bis‐phenol A and a glycidyl methacrylate, commonly abbreviated to bis‐GMA
According to Wiggs Chapter 17 (Restorative Dentistry),
What is the wavelength of light presently used to cause light curing?
460-480 nm
According to Wiggs Chapter 17 (Restorative Dentistry),
What is the most common activator in chemically cured products?
Benzoyl peroxide
According to Wiggs Chapter 17 (Restorative Dentistry),
What is the most common activator in visible light cured products?
camphoroquinone
According to Wiggs Chapter 17 (Restorative Dentistry),
What are the 4 main components in a dental composite?
inorganic fillers (mainly quartz/ glass particles),
organic resins (the glue),
coupling agent (the link or bond between the glue and the glass),
the initiator–accelerator system.
According to Wiggs Chapter 17 (Restorative Dentistry),
What do inorganic fillers do in a dental composite (6)?
Strengthen the matrix,
increase hardness
reduce wear,
reduce shrinkage,
reduce thermal expansion
Improve handling (make product thicker) and radiopacity
According to Wiggs Chapter 17 (Restorative Dentistry),
What is a coupling agent?
coating applied to inorganic fillers essentially so they will stick to the resin. Usually Silane
According to Wiggs Chapter 17 (Restorative Dentistry),
What is a major problem with methacrylate based polymerization systems?
Shrinkage! (is it cold in here?)
According to Wiggs Chapter 17 (Restorative Dentistry),
What benefit do newer silorane based products offer? How is their chemical reaction different?
reduced shrinkage
chemical reaction is a cationic ring opening which represents significantly less shrinkage.
According to Wiggs Chapter 17 (Restorative Dentistry),
What is a main esthetic advantage of a restorative material with smaller particles?
They are highly polishable and very esthetic
According to Wiggs Chapter 17 (Restorative Dentistry),
What are main disadvantages (4) of a restorative material with a lower quantity of inorganic fillers?
higher coefficient of thermal expansion,
increased shrinkage during polymerization
may absorb more water
less fracture and wear resistant
According to Wiggs Chapter 17 (Restorative Dentistry),
What are the benefits of a nanofilled composite?
maintain strength of a microhybrid, but the esthetics of a microfill composite
According to Wiggs Chapter 17 (Restorative Dentistry),
What is done to make flowable composite flowable?
more resin, less filler.
According to Wiggs Chapter 17 (Restorative Dentistry),
How much shrinkage is expected when light curing a composite resin?
3% linear shrinkage and 1.5 % volume shrinkage
slightly more with flowable products
According to Wiggs Chapter 17 (Restorative Dentistry),
What are the weakest points of the bond of a restoration?
cervical enamel cavosurface and the dentin interface
According to Wiggs Chapter 17 (Restorative Dentistry),
What are the components of a glass ionomer cement?
aluminosilicate glass powder (calcium or strontium fluoroaluminosilicate (FAS) glass)
polyalkenoic acid (polyacrylic acid),
water
tartaric acid
Barium, zinc oxide, and other metals are added to the GIC to provide radio‐opacity.
According to Wiggs Chapter 17 (Restorative Dentistry),
How does a GIC bond to the tooth?
Chemical bond
bond to dentin by forming ion salts to calcium in the tooth
According to Wiggs Chapter 17 (Restorative Dentistry),
What are main benefits of GIC?
Release fluoride
biocompatible with pulp
maintain a tight marginal seal (coefficient of thermal expansion similar to tooth)