Q1, E1 L1&2-intro & cust trays Flashcards
Whats the key for a prosthetic subsitiue?
it has to be BIOCOMPATIBLE!
________:A restoration that restores all but one coronal surface of a tooth or dental implant abutment, usually not covering the facial surface.
Partial Veneer Crown (3/4 crown)
A restoration that restores one or more cusps and adjoining occlusal surfaces or the entire occlusal surface and is retained by mechanical or adhesive means.
Onlay
1: Within the confines of the cusps and normal proximal/axial contours of a tooth 2: Within the normal contours of the clinical crown of a tooth
Inlay
Any dental prosthesis that is luted, screwed or mechanically attached or otherwise securely retained to natural teeth, tooth roots, and/or dental implant abutments that furnish the primary support for the dental prosthesis, which is being used to replace one or more missing teeth.
Fixed Partial Denture
______: An artificial tooth on a Fixed dental prosthesis that replaces a missing natural tooth, restores its function, and usually fills the space previously occupied by the clinical crown
Pontic
________: Any type of device used for the stabilization or retention of a prosthesis
Retainer(the crown) vs (the abutment is the tooth/implant)
_______: A tooth, a portion of a tooth, or that portion of a dental implant that serves to support and/or retain a prosthesis
Abutment
95% of adult occlusion is going to be cusp relationship? What is the other 5%??
Cusp to Marginal Ridge (tooth to 2 teeth) (a bit more distal)…other 5% cusp to fossa (ideal) (tooth to tooth)
When can we shoot for cusp to fossa occlusion?
in full mouth reconstruction/multiple units (stick to cusp to MR with single restorations
The modification of the occlusal form of the teeth with the intent of equalizing occlusal stress, producing simultaneous occlusal contacts or harmonizing cuspal relations
Occlusial Equilibration
What are the 6 contacts we made after occlusal equilibration?
1.molar 2.molar 3.PM 4.canines 5. incisor 6.incisor
WHY DO WE NEVER SHORTEN A FUNCTIONAL CUSP???
it decreases VERTICAL DIMENSION…adjust the corresponding fossa instead.
Always adjust a prematurity on a triangular ridge or marginal ridge by adjusting the __________ to assure you maintain the ridge’s anatomical form.
mesial and distal slopes
Anterior pre maturities: adjust the lingual of the _______ anteriors. (Phonetics or incising ability may be affected if alter _______ incisal edges)
maxillary…. mandibular
This rule prevents adjusting the functional cusp that results in loss of vertical dimension.
BULL
Reducing vertical dimension reduces _______ with potential of developing temporomandibular joint symptoms.
joint space
This guide is designed to control adjustments to clear the protrusive interferences without reducing the vertical dimension of occlusion
MUDL (mesial inclines of uppers, distal inclines of lowers)
Clinically the objective of an occlusal adjustment is to direct the occlusal forces along the ______ of the posterior teeth while the condyles are in their _______ position
long axis….centric relation
Syneresis =
to give up water (dry out)
_________ = ability to withstand tearing
Tensile strength
________: time before material begins to set; starts from the time you began mixing & includes the time you have to load material into tray or syringe
WORKING TIME
_______: time it takes for material to be completely set (from start to finish)
Setting time
_______: time you have to mix the material
Mixing time
________ is classified as irreversible hydrocolloid
Alginate
________: because it is particles of a gelatinous (colloid) state in water (hydro).
Hydrocolloid
Where does the alginic acid come from? What is the activator for alginate? Whats the retarder?
Aginic acid comes from MARINE KELP!! Activator: Calcium Sulfate….Retarder: Sodium Phosphate
What is the optimal H2O temp for working with alginate?
73 degrees yo!
What type of alginate powder do we use at ASDOH? Regular or Dustless?
Regular
Impression tray: Trays should extend distally to cover the maxillary ________ and cover the mandibular ________ for maximum anatomical reproduction
tuberosity…retromolar pad
Impression tray: Tray height should fully cover the ______ of anterior and posterior teeth
length
Impression tray: Tray should extend beyond the facial aspect of the teeth with ____ inch of space between the tray and soft tissue, The tray size should be ________ for the patient
1⁄4… comfortable
_____ may be added to the borders of the tray to extend its length or height
WAX!
Wax can be placed in the ______ area of patients with high palates to eliminate voids in the palatal area
palatal
Wax may be placed around the tray ________ to protect and cushion the soft tissues in the oral cavity
periphery
The placement of utility wax on the posterior region of the maxillary tray prevents excessive alginate from flowing WHERE?
DOWN THE THROAT!
Adhesive: Place ___-___ minutes before loading tray..What are the two uses?
5-10…to adhere the material to the tray AND to stop distortion
Always take the ________ impression first. The patient is less likely to gag, thus resulting in a positive experience!!
mandibular
Impression taking: Doctor ______ of the patient for mandibular and _________ for the maxillary
in front….to the side or posterior
Inspector Gadget that Shiz: A smooth homogeneous ____….No _______ from the impression tray…. Coverage of the total dentition and its accompanying freni and vestibular anatomy…Presence of _____ and air bubbles…No evidence of tray visibility in the incisal
and occlusal surfaces…Sharp anatomical detail…Blood, saliva and debris
Setting….separation…VOIDS…
Disinfect the impression and pour within ____ minutes
30 minutes!
Agar is classified as a _______ hydrocolloid
reversible
The PVS we will mainly be using is a _______ impression material and is further categorized as an ________. What does PVS stand for?
Elastomeric impression material….addition silicone…PolyVinyl Siloxane
What is another name for the “rubber base” elastomeric impression material?
Polysulfide
What was the first type of silicone impression material?
Condensation Silicones
Which impression material am I talkin bout? Adv: Short working time, Good tear strength, Highly accurate, Minimal distortion, Dimensionally stable……Disad:Hydrogen gas release can cause dimensional change, Requires VERY DRY conditions, Expensive
PolyVinyl Siloxane (addition silicone)
What type of impression material is PolyEther?
elastomeric impression material (Easy to break stone cast upon removal Absorbs water so must be stored dry or will experience significant dimensional change Allergic Reactions)
Contact angle measurement on unset material is a method used to determine _______.
hydrophilicity
A contact angle of GREATER than 90 degrees means it is a _______ material.
HYDROPHOBIC
A contact angle of LESS than 90 degrees means it is a _______ material.
Hydrophillic
COST comparison! What is the most expensive? What is the least? Where does PVS fit in?
Most $$$: Polyether….Least $: Alginate….PVS is 2nd most expensive!
What has the BEST dimensional stability? What has the WORST?
Best: Addition silicone…Worst: Hydrocolloid
Wettablility: BEST? Worst?
Best: Hydrocolloid…Worst: hydrophobic addition silicone
STIFFNESS: Where do addition silicone and hydrocolloid fit in?
addition silicone is 2nd stiff…hydrocollod is LEAST stiff
TEAR STRENGTH comparison: where do addition silicone and hydrocolloid fit in?
addition silicone is 2nd tear strong…hydrocollod is LEAST tear resistant
What is the definition of an impression tray?
A device used to CARRY, CONFINE, and CONTROL impression material while making an impression.
Custom tray: Maintains optimal thickness of impression materials, _____ to ____ mm for elastomers, Require _____ impression material, Provide proper ______ extensions
2.0 to 4.0mm…less…flange
The gypsum components of different materials are IDENTICAL chemically; differences in these materials is attributed to _______.
CALCINATION…whatever the f that means
Increase in water temperature above ___ degrees F when mixing the plaster
68 degrees
Pinch of ______ (_______) can accelerate the setting of stone/plaster.
table salt (sodium chloride)
SAY WHAT!?!? Plaster/Stone: Slower rate of _______ will slow down the setting time
spatulation
If table salts can speed up setting time of stone, _____ (_______) in small concentrations can SLOW her down!
Borax (calcium salts)
Stone/Plaster: Increase in the amount of water specified by the manufacturer, although this ______ the cast
WEAKENS!!
When mixing gypsum, sprinkle the powder into the water to obtaining better mixing and reduce the chance for trapping air bubbles…SO ______ BEFORE _______
WATER before STONE
Custom Trays: Used for ________ impression materials
elastomeric
What type of resin did we use for our custom trays?
PhotoPolymerized Resin
For PVS how much separation do we want between the tray and the teeth for the material?
2.5mm
TRIPLE TRAY! _______ only (Not for implants)….Only if preparation is supported by adjacent teeth (never the most _____ tooth in the arch)
Single Units…DISTAL
