CHAPTER 8 PPT 2

Measures how much material expands/contracts with temperature changes

Define LCTE

True

TRue or false: COmposite has 3x higher LCT than tooth structure

radiopaque fillers

Radiopacity is achieved by adding what to barium glass?

-Filelr size

-Shape

-Amount

-Location in mouth

-Occlusion

in wear resistance, it is affected by?

-Chewing

-Brushing

-Abrasion

in wear resistance, 3 components that are resistance to surface loss

solutbility

This means material breakdown in oral fluids

water sorption

This indicates hwo much water the material absorbes over time

Lower water absorption

IN water resoprtion, what does it mean if it has higher filler content?

-gingiva health (near soft tissues)

Reason for importance of surface texture

Nanofill and nanohybrid composites

In surface texture, what composites offer smooth and esthetic finishes

-Filler properties

-Polishability

Surface texture is determined by:

Modulus of elasticity

This reflects stiffness of material

rigid

In modulus of elasticity, what does it mean if it is high modulus?

Flexible

In modulus of elasticity, what does it mean if it is low modulus ?

-tooth flexure

-Protects bond integrity

in modulus of elasticity, 2 factors of use of flexibility

Occer as composite material polymerize (harden)

Define polymerization shrinkage

Marginal gaps

In polymerization shrinkage, if materail pulls away from cavity walls, it would cause?

Polymerization shrinkage

What can cause the material to pull away from cavity wall

-MIcroleakage

-Recurrent carries

In polymerization shrinkage, the gaps may lead to 2 problems

-Use of adhesive bonding

-Incremental layers

-Place RMGI liner

-Control placement direction and minimize volume

In polymerization shrikage, what are some preventive techniques

Configuration factor

THis means ratio bonded surface to unbounded (free) surfaces

Configuration factor

This means the ratio of bonded surface to unbonded (free) surfaces

-greater internal stress during curing

In configuration factor, wat does it mean if higher C-factor

-C factor=5

-HIgh risk

In configuration factor, what is level and risk is class 1?

-C-factor = -.25

-Low risk

in configuration factor, what level and risk is class IV

-soft start curing

-flowable composites/ stress-breaking liners

In configuration factor, minimizing stress can be achieved by use of ?

-typical hybrids (Bis-GMA/UDMA)

-Microfills and flowables

-Silorane-based

3 types of composites by shrinkage

Microfills and flowables

This type of composite has a higher shrikage due to its lower filler content

0.7%

In silorane-based, what percent is it?

-Self-cured composites

-Light-cured composites

List two types of polymerization methods

Self-cured composites

This polymerization method has hgiher risk of air bubbles and internal porosity

Light-cured composites

This polymerization method requires light source to initate curing

Light positioning

in light cured composites, the shrikage direction is influenced by ?

reduces shrikage stress

IN light cured composites, it has less internal porosity, meaning?

Breakdown of amines

IN self-cured composites, it has lower color stability by?

MOre finishing needed

IN self-cured composites, it has short working time, meaning it needs?

-Quartz-Tungsten-halogen (QTH)

-Plasma Arc Curing (PAC)

In light curing systems, lsit the 2 old methods

Blue lED light curing untis

In light curing systems, list the modern standard

Blue LED light curing units

This type of light curing system porvides faster, consstent curign with reduced stress

-OLD METHODS: Quartz-tungsten-halogen

Plasma Arc Curing

Which system are fast but produces more heat and stress

-Proper technqiue

-Effective bonding

In steps in composite restoration, sucess depends on?

-Veneers

-Contouring

-Distema closures

in indications for use, the composite has esthetic enhancements, list the 3 components

-Rubber dam

-Cotton rolls

In isolation factors, lsit 2 materials that have proper isolation from moisture

Amalgam

In occlusal factors, what material is better for bruxism, heavy occlusion, and complete occlusal contact?

Composite

In occlusal factors, what material performs well for normal occlusion

-Medical history

-Chart

-Radiographs

In clinical technqiue, inital clincal procedures, what 3 factors must be reviewd before starting procedure?

-Finalize examination

-Diagnosis

-Treatment plan

IN initial clinical procedures, what 3 procedures must be done before operative work?

Local anesthesia

In clinical procedure, what is used to reduce sailvation t oaid in moisture control for bonding of composite?

Clean with pumice

In preparation of operating site, what material is used to remove plaque and stains

-Flavoring

-GLycerine

-Fluoride

In preparation of operating sites, in using prophy apstes, what should you avoid that may interfere with bonding?

-Cervical

-MIddle

-Incisal

In shade selection, what must be checked on the tooth for natural color gradation

Rubber dam

In isolation of operating site, what is the preferred method for moisture control and access?

-NO. 212 clamp

-Facial/lingual lesions

In the rubber dam, what type of clamp is required for what type of lesion?

-Depress gingiva

-Protect tissue and dam

-Separate teeth from matrix placement

List the 3 uses of rubber dam

Cotton rolls (with or without retraction cord)

in isolation of operating site, what is the alternative to rubber dam that requires experienced operator?

facial vesituble

In cotton roll placement, where should it be placed adjacent to target tooth

Lingual vestibule

In cotton roll placement, where shoudl it be placed for manidublar teeth?

Retraction cord

In insolation for preparation site, what is used for the subgingival margins

Astringent

In the retraction cord, it is soaked in what type of solution to control bleeding?

Proximal restorations

In other pre-operative considerations, what type of restoration is pre-wedged to help with contact re-establishment

use better isolation techniques

In poor isolation of operating area, what is used if there is no rubber dam or leaking rubber dam?

use matrix to asssit in isolation

In poor isolation of oeprating area, what msut be done if there is inadequate cotton roll isolation?

Repeat bonding

In poor isolation of operating area, what must be done if there was careless technique?

Using different material other than composite

in poor isolation of operating area, what do you have to do in a deep gingival preparation?

Re-etch, prime, bond the area

In white line or halo, what procedure is done for traumatic countouring/ finishing?

-Remove edfect conservatively & restore

In white line or halo, what procedure is done when there is inadequate etching/bonding

intermittent finishing and s

In white line or halo, what procedure is done if there is excessive curing intensity?

leave as it is and monitor (for leakage)

In white line or halo, what is done if there is no identified reason

Insertion technique

In voids, what technqiue is used for moxing of self-cured composite

-Repair marginal voids (repreparaing & restoring)

in voids, what must be done if presence of gaps between increments?

Proper matrix contouring and placement

In weak or missing proximal contacts (class 2,3,4), what must be done for poorly contoured matrix band?

-film wedging pre-op and during insertion

In weak or missing proximal contacts (class 2,3,4)

Ensure matrix contact with adjacent surface

In weak or missing proximal contacts (class 2,3,4)

-use sectional matrix system for single contacts

In weak or missing proximal contacts (class 2,3,4)

Hold matrix during curing ( wiht use light tips/ hand instruments)

In weak or missing proximal contacts (class 2,3,4)

Careful with isnertion technique

In weak or missing proximal contacts (class 2,3,4) , what must be done when matrix band is too thick?

use natural or neutral lighting

In inaccurate shade selection, what must be done in poor operator lighting?

TRy cure shade on tooth and remove

In inaccurate shade selection,

undertand natural shade zones of the tooth

In inaccurate shade selection, what must be done when there is a incorrect shade?

add bevels, flares, or retention grooves

In poor retention, what is doen when there is inadequate prep form?

Maintain strict isolation during bonding

in poor retention, what must be done if there is a contaminated bonding area?

Folllow manufacturer's bonding protocol carefully

In inaccurate shade selection

use rotary instruments

In inaccurate shade selection

use well contoured matrix and proper tools

In inaccurate shade selection

match natural anatomy and embrasure form

In contouring and finishing, what msut be done if there is ditching cementum

view all angles during finishing

In contouring and finishing, what must be done in inadequate anatomic form?

use instruments and techniques

In contouring and finishing, what must be done if margins are hard to visualize?

Retention grooves

In controversies and clincal considerations,

-composite = shared occlusal load

-avoid sole load-bearing areas

In controversies and clinical considerations, what are some consdierations on wear problems?

-RMGI liners

In controversies and clinical considerations, what is used to help resist caries in gap formation?