L11 RPD Clasps and Biomechanics

Supraburge

arises (above or below) the survey line

push or pull retention

covers small or large tooth area?

does it display significant amount of metal?

above

pull

large

yes

does supraburge

• disrupt natural food flow over gingival margin?

• is it easy or difficult to adjust?

yes it disrupts food flow over gingival margin

difficult to adjsut because multiple bends are required

what are thee advantages of supraburge

• it has excellent —- , — .—-

excellent bracing, reciprocation, retention

infraburge arises above or below the survey line?

does it have more or less tooth contact?

does it have increased or reduced caries risk

does it have superior esthetics or no

how do you reduce metal display for infraburge

less tooth contact

decreased caries risk as a result

superior esthetics

you do distal placement of metal display

is infraburge simpler or more complex to adjust than circumferential

more simple

what are the contraindications of infraburge

frenum shallow vestibule large tissue undercut high survey line

Akers Clasp and akers arm is different

aker ___ is the one with two arms and one rest seat , one being retentive arm and the other is bracing arm

akers circumferential clasp

ring clasp is another type of supraburge

you use it when the retention undercut is on the —- as the rest seat

when the undercut is on the same side as the rest seat.

the ring clasp goes all the way around and engages tip where needed

embrausre clasp is two —- back to back

akers

Infraburge clasps include what

Y bar

I bar

T bar

½ T bar

the retention for Y and T bar are — because they have —-

double, two tips

when are stress releasing clasps needed

kennedy class I and II when there is no distal support

RPI

does it have a lingual arm?

it has minimal —- contact which ——

is it easier or harder to adjust than circumferential clasp

it satisfies the —- requirement (>180 degrees)

no lingual arm

tooth, decreases caries perio risk

easier

encirclement

what are the rpi components

mesial rest, proximal palte, i bar retentive arm

RPA you do this when

— is contraindicated due to —-, —-, —-,

and if the survey line is ——

and if patient has —-

tissue undercut

shallow vestibule

frenulum interference

close to the oclcusal surface (not correctable with enameloplastiy or restoration)

poor manual dexterity who might have difficulty maniupulating an i bar prosthesis

Stress releasing clasp - combination clasp

has retention from —- which is flexible and as a result it doesnt —- the abutment

its called combination because it has two metals : — —-

wrought wire , thin wire flexible

doesnt torque or tip the abutment

metal chrome and wire?

whend o you make a dimple preparation

when you dont have an undercut

what are the dimensions of rest seat`

2.5 × 2.5

what is the thickness vertical depth

1.5mm

embrasure clasp what are the two numbers semi circleto semi circle . and then that rectangle part to rectantle

2,5

what is the dimension of cingulum rest for canine

2.5-3 width and then 1.5 mm flat bottom