Contour of wax pattens

Inlay wax

known as casting wax

can make shapes in sticks, cones, bulk containers, sheets of various thickness

comes in ivory dignostic of diff colors

Inlay wax properties

best if contrast die material

dimensional stable

does not pull or chip during carving

vaporize during burnout

What is the definition of CTE

material expands or contracts with a temperature change

wax has highest CTE

flow

when heated

no flow at room temp

thermoplastic

a material that is soft when heated and solid at room temperature

inlay is termoplastic

Thermoconductivty

wax has high and low thermal conductivity during heating/cooling

high coefficient of thermal expansion and contraction

Expansion

heated- expands

cools-contracted

Ductility

permanently deformed without breaking as temp increase

uneven stresses put on wax cause distortion and warping

Plasticity

compacity to being molded

Overheating Inlay wax

wax properties to be burned out and brittle

cause stress and distortion

Underheating Inlay wax

sluggish wax

no flow (hard to work)

trapped air pockets (stress)

Functional contour

prosthesis will work without causing damage to remain teeth/soft tissue

contacts with opposing teeth while in occlusion

shape and size preserve the health of gingival tissue

Anatomic Contour (esthetic quality)

prosthesis relates to its environment

looks like the patient’s natural teeth

pleasing to eye and proportionally correct

Occlusion contour is both ____________ and ____________ contoured

Anatomically and Functionally

_________ will have consistency with remaining teeth

Prosthesis

________ relationship tips should follow the development line

Cusp tip fossa

______ should be the same height

Marginal ridges

what should be esthetically pleasing

prosthesis

________ must math the teeth on either side, this create proper function and appearance unless bite is too tight

Marginal ridges

Function will ________ consistenct with adjacent teeth if it interferes with function of occlusion

overrule

true or false

functional occlusion is mort important than appearance

true

true or false

when one or two adjacent marginal ridges is higher than the other, food can pack into the interproximal area

true

buccal and lingual contours should not be _________

Bulky

when the patients eats the natural contours of teeth deflect food this action stimulates ________ so the tissue will remain healthy

soft tissue

Lip, tounge, and cheek muscles aid in cleaning the ________ and _______ lingual surfaces of the teeth

facial and lingual

true or false

over-contour restorations keep these self-cleaning mechanisms from working

true

proper contour can be seen in the ________ profile or natural teeth

emergence

natural teeth exhibit a profile that is ______ and continues to the height of contour as they emerge from the _______

straight gingival sulcus

________ is extremely hazardous is the area, especially in the interproximal

Over contouring

area to consider under anatomical/functional contour

proximal contour- contact

posterior contact- 1-2mm oval extending buccal/lingually

anterior contact is ______ than posterior and may be round or oval

smaller

cerival and gingival embrasues are important because the determine _______ and ______ of the interproximal papilla

configuration/size

over contouring the proximal surface could crowd the interproximal papilla resulting in ___________ and ________ periodontal breakdown

inflmmation/subsquent

absolute dimensions (functional cotour)

must be established first because they are absolute

M/D width (set by interproximal surfaces of adjacent teeth)

Occlusal high or length (established by the occlusal surfaces of opposing dentition)

Apparent dimensions considered anatomic contour

visual illusions or esthetic artistry

line angles can make teeth appear wider, longer, shorter, more narrow masc/fem and gives character to teeth

thickness and important in lower anterior teeth

development grooves and textures surface add life

_____ form of the incisal edge

silhouette

incisal corner can affect both the _______ and the ________

line angles/incisal edge

direct waxing techmiques (chew-in technique)

dentist place heated wax in patients mouth on the prep tooth

then patient chew until no interference with their bite

the pattern is waxed, sprued and case (no die needed)

Waxing sequence of indirect waxing

negative waxing (moosh bite) because carving is done

articulating model is closed against the wax to displace it (basic shape)

to obtain a satisfied fit of casting/gold crown be aware of __________ factors

enviromnetal

wax and invest patterns in a _____ temp

where temp is constant

room

use room temp _______ for the investment mix

distilled water

invest the pattern as _______ as possible after completion

quickly

wax pattern can be 10/15 degress cooler under a hot light bulb, flame or etc

this can cause wax to shrink

during the casting procedure the ________ about 1.25-1.5 percent from the molten to the solid state

gold contracts

never use _______ when investing and follow the water powder ratio

pre wet the ______

tap water

bowl

when investing wax patterns postion the wax patterns in the _______ of the investment mold and the ______ in the _____ of the ring

cold zone

reservoir/ heatcenter

This allows the molten metal to be ______ into the casting and sprues as they cool

pulled

Casting will cool ______ sprues will cool _____ and reservoirs cool ______

first

second

third