Week 11 Flashcards
what is a cemented or permanently affixed extra coronal restoration that covers, or veneers, the outer surface of the clinical crown
crown
what is a full coverage or a complete crown that covers the entire clinical crown of a tooth?
full veneer
what can a crown be also referred to as (4)?
full veneer, full coverage, complete crown, or full crown
what can a crown be fabricated of?
- metal (FCC)
- ceramic veneer fuse to metal (PFM or MCC)
- all ceramic material (ACC)
- resin and metal
- resin
what is FCC
full cast crown
what is MCC
metal-ceramic crown
what is ACC
all-ceramic crown
what is a partial coverage crown
3/4, mesial 1/2 and 7/8
what is an all-ceramic thin layer of dental porcelain or cast ceramic that is bonded to one surface of the tooth with an appropriate resin
laminate veneer
what is a prosthetic appliance that is permanently attached to remaining teeth or implants and replaces one or more missing teeth?
fixed partial denture (bridge)
then becomes a FDP (fixed dental prosthesis)
what is FDP
fixed dental prosthesis
what are the 5 components of diagnosis
- health history
- TMJ and occclusal evaluation
- intraoral examination
- diagnostic casts
- full-mouth radiographs
what to look for when examining health history
- medications
- allergies
- cardiovascular disorders
- epilepsy
- diabetes
- xerostomia
- osteonerosis
- current complaint and patient expectations
do we include herbal products when looking at patient meds?
yes
what type of allergies should we show concern for
impression materials, latex and nickel-containing alloys
what are important CVD what we look for?
- BP < 140/90 Hg
- anticoagulants such as coumadin - INR (international normalized ratio)
- IE = infective endocarditis
will we work with patients that have a diastolic reading of greater than 90?
NO
what should we ask for regarding pt diabetes
- HbA1c (how much glucose is tied to RBC)
- hyperglycemia/hypoglycemic episodes
why should we ask pt about diabetes
- healing is generally impaired (circulation issues)
- periodontal breakdown
what can cause xerostomia
- large doses of radiation in oral region
- Lupus erythematosus
- Sjogren’s syndrome
- side effect of numerous drugs
tmj and occlusal evaluation
- joints palpated as pt opens and closes to detect signs of dysfunction
- masseter muscles palpated extraorally by placing the fingers over the lateral surface of rami of mandible
- fingers are placed over patient’s temple to feel temporalis muscles
- index finger used to touch medial pterygoid on inner surface of ramus
- trapezius muscle is felt at base of skull
- SCM grasped between thumb and forefingers
- distance between max and mandibular incisors is measured when patient is open all the way (most people should open at least 1 inch)
- if opening is limited or painful, pt should be instructed to use a finger to indicate the area that hurts
what can we use to protect ourselves from infectious diseases
- rubber gloves
- surgical mask
- eye protection
principles of crown preparation
- preservation of tooth structure
- retention and resistance
- structural durability
- marginal integrity
- preservation of the periodontium
what does it mean to preserve tooth structure
- conserve as much tooth as possible
- must balance with structural durability
what is TOC
total occlusal convergence (term for taper)
what degree TOC should we shoot for
10-15 degrees
what does retention and resistance include
- taper/TOC
- freedom of displacement
- length (>3 mm preparation wall height)
- internal features
- path of insertion
what are the 2 most important factors for crown retention
TOC and length
what is freedom of displacement
ways a crown can come off tooth
preps are nearly always aligned with ___ axis of the tooth
long axis
are anterior 3/4 crowns usually aligned with long axis?
NO
are there any sharp angles in crown preps?
NO. Corners will be rounded!
what does structural durability involve?
- functional cusp bevel
- axial reduction
what is marginal integrity?
want NO or microscopic space
advantages of Chamfer finishing line
minimal tooth destruction and minimal stress
disadvantages of Chamfer finishing line
reduces crown strength (ceramic) and poor esthetics (ceramic)
how to preserve periodontium
- margins are to be as smooth as possible and fully exposed
- supragingival if at all possible
- subgingival margins difficult to make, evaluate and keep clean
what margins are difficult to make, evaluate and keep clean?
subgingival margins
why would you need to place subgingival margins?
caries, previous restorations, trauma, or esthetics
what bur to use for facial and lingual axial reduction
coarse-grit tapered torpedo diamond 856
what bur for proximal axial reduction
medium-grit short needle and coarse-grit tapered torpedo diamonds 876 856
what bur for occlusal reductiion
coarse-grit round-end tapered diamond 856 and no. 171L bur (book)
what bur for Chamfer and axial finishing
fine-grit tapered torpedo diamond
what bur to use for functional cusp bevel
coarse-grit round-end tapered diamond 856 and no. 171L bur (book)
