Fixed prosth 3 FINAL

layered

crown consisting of multiple materials, e.g. porcelain fused to zirconia

monolithic

single material crown

optimum esthetic outcome

why do restorations need to be layered?

chipping

disadvantage of layereed materials

lithium disilicate

which material should NOT be used for posterior bridges

pulp tissue remenants

most common cause of intrinsic staining after endo treatment

external bleaching, internal bleaching, veneers, crowns

treatment options for improving color of teeth

35% hydrogen peroxide gel

what is used for internal/external bleaching?

cervical root resorption, enamel/dentin damage, inhibition of adhesive bonding, gingival irritation

complications/risks of bleaching

follow manufactures instructions

to avoid risks when bleaching the dentist should

attrition

flattened incisal edges indicates

attrition

wear that occurs from tooth to tooth contacts

grinding

key cause of attrition

abrasion

cervical defects with gingival recession, occlusion is fine

abrasion

mechanical wear that occurs from anything other than tooth to tooth contact

erosion

loss of tooth structure through chemical processes not involving bacteria

GERD, vomiting, bulimia

intrinsic causes of erosion

soda, wine, citrus

extrinsic causes of erosion

abfraction

loss of hard tissue attributed to biomechanical loading forces in stress concentration

true

T/F the cause of abfraction reemains controversial

true

T/F tooth wear is a multifactorial condition

attrition and erosion

with what causes of tooth wear would occlusion be compromised?

attrition

wear facets of oposing anterior teeth match

erosion

presents with irregular incisal edges

labial and palatal

erosion affecets ____ and _____ surfaces as well as incisal edges

attrition

wear facets tend to be shiny

erosion

presents with chamfer margins on palatal surface

attrition

fracture and flattened occluding surfaces tend to be seen with?

erosion

raised restoration and cupping of posterior occlusal surfaces tend to be seen with?

true

T/F material selection in terms of function may not be a major factor when treating worn dentition from erosion

attrition

with which type of tooth wear is material selection most important

monolithic zirconia

what is the material of choice for a patient with buxism

tooth display at rest and gingival display at smile

what are the important aspects of esthetic analysis

tooth and gingiva

components of esthetics

true

T/F maxillary central tooth display decreases with age

3mm

average patient preference for tooth display at rest

-2mm older individual, 0mm younger individuals

average patient preference for gingival display at smile

static, dynamic

functional rehabiliation manages the _____ and ____ occlusal force

maxillary

which arch is mounted first on the articulator

transfer position of maxilla relative to cranial base

what do the earbow facebow and kois dento facial analyzer do?

MIP

single crown is mounted in

centric occlusion

most reproducible position when establishing patient occlusal scheme

custom incisal guide table

how are anterior guidance and condylar guidance mounted in harmony on the articulator

freeway space

arbitrarily subtracting 3mm from VDR, estimates the space between teeth

closest speaking space

measured during fricative and sibilant sounds

esthetic analysis and functional rehabilitation

treatment planning involes

0.6mm

when using a multilayered zirconia of 3Y/4Y/5Y zirconia what is the minimum cervical finish line size

1mm

occlusal reduction necessary for 3Y zirconia

1.5mm

occlusal reduction necessary for 5Y zirconia

provisional

any adjustments to occlusal scheme should be done at ____ phase

true

T/F studies are needed to asses the accuracy of optical jaw tracking systems when recording CR and condyle guidance

large restoration, caries, unideal shape and angulation

when would a surveyed crown be considered for RPD

tissue undercuts, evaluate long axis of abutment teeth, determine path of insertion

purposes of surveying diagnostic cast

path of insertion

most important factor in determining how much tooth reduction is needed to meet mechanical and esthetic requirements for RPD

true

T/F path of placement is more important than long axis of tooth when determining tooth reduction needed for surveyed crowns

survey diagnostic cast, design RPD, prep guide planes GOC and rests, survey check cast, prep surveyed crowns, full arch PVS impression, definitive cast and die, final impression, evaluate surveyed crown wax up, framework try-in, interocclusal record, tooth set up, wax tryin, RPD delivery

sequence of fabricating retainers for RPD

full arch PVS

which type of impressions are used for surveyed crowns

tripod marks, RPD specification, approved RPD design form

what information is given to the lab for surveyed crown fabrication

true

T/F the lab sends a wax up of the surveyed crowns to evaluate PRIOR to framework try-in

before

tooth modification on abutments teeth are made ____ the final impression for surveyed crown

guide planes, height of contour, rest seat, surveyed crown

order of preparations for RPD

after

surveyed crown preparations are done ______ path of pacement is determined and enamel modification are made

1mm

minimum metal thickness of metal crown between rest seat and prepared tooth

true

T/F including the rest seat into the surveyed crown preparation is more conservative but it means the lab is not able to alter the position of the rest seat

side needing greatest amount of reduction

which side of tooth should be prepared first for surveyed crown

true

T/F to resist risk of porcelain fractur an occlusal rest seat should not be placed directly on porcelain

1mm

thickness required between lateral wall of rest seat and porcelain metal junction of metal ceramic surveyed crown

after

rest seats and guide planes in surveyed crown are done _____ full contour wax up

after

framework is cast _____ the fabrication of surveyed crowns

1.5mm

for metal ceramic restorations functional cusp reduction should be _____

2mm

interocclusal space required for surveyed crown prep at location of rest seat

1/4 MD and 1/2 BL

size of rest seat for molar

1/3 MD and 1/2 BL

size of rest seat for premolar

full arch impression with PVS

next step after tooth preparation for surveyed crown

IV

definitive cast for surveyed crown is poured in type ___ dental stone

true

T/F a new record base should be made from definitive impression and should not be reused from diagnostic cast

establishing sufficient space

what is the highest priority when preparing rest seats in existing cast restorations

direct

technique for fabricating crown under existing RPD in which pattern of restoration is formed directly on tooth preparation

direct-indirect

technique for fabricating crown under existing RPD in which impression taken of crown and pattern is fabricated exraorally and contour is built up intraorrally

indirect

technique for fabricating crown under existing RPD in which tooth is prepared and RPD is picked up with impression of surveyed crown and sent to lab

indirect

which technique for fabricating crown under existing RPD leaves patient without RPD while crown is being fabricated

less fracture, less bulky, more esthetic, better retention, less food stagnation

advantages of attatchments for RPD

4-6mm

minimum abutment height for attachment for RPD

true

T/F In general, whenever a conventional clasp arm direct retainer can be used, it is

the design of choice

stress on abutments and difficult oral hygiene

disadvantages of extracoronal attachments

extracoronal attachment

Any prefabricated attachment for support and retention of an RPD in which the

“male” and “female” components are positioned outside the normal contour of

the abutment tooth

crown, framework

for RPD attachments the female part is incoprotated into the ___ and the male part s incorporated into the _____.

intracoronal attachment

“Male” and “female” components positioned within the abutment tooth's

normal contour

1mm

intercoronal attachments should be at least ___ from the metal ceramic junction

true

T/F most labaroatory made attachments require the use of lingual retentive clapss for positive retention

true

T/F laboratory made attachments tend to have less frictional retention than comercially available precision attachments

radicular attachment

attachment cemented into RCT tooth to retain overdenture

2mm

for BAR radicular attachmenets, the bar should be positioned about ___ away from soft tissues

1mm

Attachments and occlusal rest seats in metal-ceramic restorations should be

placed at least ____ from the metal-ceramic interface

raw

higher quality, larger files, with more flexibility in post production

jpeg

smaller compressed file, ready to be used immediately, limited post production

shutter speed, aperture, ISO

what factor affect exposure control

shutter speed

the length of time your camera's shutter remains open, determining how long light strikes the camera sensor

blurry and birght

a SLOW shutter speed (1/4s) will produce an image that is ____ and ____

fast

what shutter speed is recommended in dentistry