1. Lecture 1 - Fixed Proths Midterm: Introduction + Gypsum/Alginate

replacement and/or restoration of teeth by artificial substitutes that cannot be removed by the patient

What is the purpose of Prosth. treatment?

single crown

ID the type of fixed prosth.:

inlays and onlays

ID the type of fixed prosth.:

veneers

ID the type of fixed prosth.:

resin bonded FPD

ID the type of fixed prosth.:

3- unit FPD

ID the type of fixed prosth.:

foundation restoration/post and core

ID the type of fixed prosth.:

8%

What is the % incidence of complication for an all ceramic crown?

10%

What is the % incidence of complication for a post/core?

11%

What is the % incidence of complication for a conventional single crown?

27%

What is the % incidence of complication for a conventional fixed partial denture?

26%

What is the % incidence of complication for a resin bonded fixed partial denture?

fracture

What is the most common complication for all ceramic crowns?

-fracture

-need for endo tx

-loss of retention

Post Loosening

What is the most common complication for a post/core?

-Post Loosening

-Root Fracture

-Caries

Need for Endodontic Tx

What is the most common complication for a single crown?

-Porcelain Veneer Fracture

-Need for Endodontic Tx

-Loss of Retention

Caries on abutment

What is the most common complication for a Fixed Partial Denture (FPD)?

-Caries on abutment

-Need for Endodontic Tx

-Loss of Retention

Debonding

What is the most common complication for a Resin Bonded Fixed Partial Denture (FPD)?

-Tooth Discoloration

-Caries

-Debonding

-Serve as a complement tool in addition to clinical examination
-Provide a legal proof of pt's current occlusion
-Allow clinician to modify occlusal pre-treatment plan prior to establish a definitive TxPlan
-Allow clinician to evaluate pt's occlusion in centric and eccentric positions
-Allow clinician to determine inter arch distance, relationship between the teeth and alveolar ridge and allow clinician to make as many alteration to as clinician's desire w/ absence of the patient.

What are 5 purposes for Mounted Diagnostic Casts on an articulator?

irreversible hydrocolloid

What type of material is alginate?

negative

If you are working with alginate, your goal is to make a _______ impression of the patients oral tissues

positive

If you are working with dental stone, your goal is to make a _______ impression of the patients oral tissues

-Inexpensive
-Easy manipulation
-Pleasant taste
-Able to displace blood and body fluids
-Hydrophilic
-Easily poured
-Can be used with stock trays
-Accurate if handled properly

What are some advantages of alginate hydrocolloids?

-Low tear resistance
-Must be poured immediately
-Limited detail reproduction
-Dimensionally unstable(syneresis vs imbibition)
-Can only be used for single casts
-Incompatible with epoxy resin die materials

What are some disadvantages of alginate hydrocolloids?

sodium alginate

What is the alginate we use made of?

2Na3PO4

What is the "retarder" of the alginate reaction?

3CaSO4

What is the "accelerator" of the alginate reaction?

1:1

what is the water to powder ratio for alginate?

1 minute

If you want a regular setting time, how long should you mix the alginate for?

45 seconds

If you want a quick setting time, how long should you mix the alginate for?

3.5 minutes

After mixing, how long does it take for an alginate impression to set?

increase

a lower water/powder ratio of alginate will result in a _____ in strength

increase

a lower water/powder ratio of alginate will result in a _____ in tear strength

better

a lower water/powder ratio of alginate will result in a _____ consistency

decrease

a lower water/powder ratio of alginate will result in a _______ in working time

decrease

a lower water/powder ratio of alginate will result in a _______ in setting time

decrease

a lower water/powder ratio of alginate will result in a _______ in flexibility

decrease

a higher water/powder ratio of alginate will result in a ______ in strength

decrease

a higher water/powder ratio of alginate will result in a ______ in tear strength

runny

a higher water/powder ratio of alginate will result in a ______ consistency

increase

a higher water/powder ratio of alginate will result in a ______ in working time

increase

a higher water/powder ratio of alginate will result in a ______ in setting time

increase

a higher water/powder ratio of alginate will result in a ______ in flexibility

increase

using cold water for mixing alginate impressions will ______ you working and setting times

decrease

using warmer water for mixing alginate impressions will ______ you working and setting times

syneresis

Loss of water due to dehydration that causes shrinkage:

imbibition

Tendency to absorb water that results in swelling:

100%

if you can't pour your stone in an alginate impression right away, you can store it in ____% humidity for 30 mins

calcium sulfate

what is the base of all gypsum powder made of?

calcination

Gypsum products are manufactured by the ______ of calcium sulfate dihydrate

type 2

what ISO type is white plaster that we use to pour up alginate impressions?

type 3

what ISO type is micro-stone?

Differences in properties result from differences in the physical nature of the powders, and how they are processed

Both plaster and stone are products of partial dehydration of gypsum. How are they different?

dry

Traditional hemihydrate plaster is produced by _____ calcination

wet

medium and high strength plaster (stones) is produced by _____ calcination

decrease

When using slurry water instead of regular tap water, it will _______ the setting time

decrease

When using slurry water instead of regular tap water, it will _______ the compressive strength

increase

When using slurry water instead of regular tap water, it will _______ the dimensional change

more

The different water requirements of plaster, stone, and high-strength stone are mainly the result of differences in the apparent density of the powders. ISO 2 lab plaster requires ____ water than higher ISO stones, like Die-keen ISO 4

-fluid
-plastic
-friable
-carvable

What are the 4 stages of the stone setting process?

decrease

when mixing stone, an increase in spatulations will result in a _____ in the setting time

inversely

Setting expansion is _______ proportional to the water-powder ratio

inversely

Strength is _______ proportional to the water-powder ratio

increase

An Increase water/ powder ratio will result in a ______ in the setting time

increase

An Increase water/ powder ratio will result in a ______ in the consistency

decrease

An Increase water/ powder ratio will result in a ______ in the setting expansion

decrease

An Increase water/ powder ratio will result in a ______ in the compressive strength

decrease

An Increase in the rate of spatulation will result in a ______ in the setting time

decrease

An Increase in the rate of spatulation will result in a ______ in the consistency

increase

An Increase in the rate of spatulation will result in a ______ in the setting expansion

no effect

An Increase in the rate of spatulation will result in a ______ in the compressive strength

decrease

An Increase in the water temperature will result in a ______ in the setting time

decrease

An Increase in the water temperature will result in a ______ in the consistency

increase

An Increase in the water temperature will result in a ______ in the setting expansion

no effect

An Increase in the water temperature will result in a ______ in the compressive strength