ERIN lecture 12 Rotational Dual Path

Question 1

Describe the direction of rotational path placements?

Answer 1

• lateral
• Posterior anterior (PA)
• Anterior posterior

Question 2

what are claps replaced with when it comes to dual retainers?

Answer 2

clasps replaced by RIGID retainers

Question 3

what engages the undercuts?

Answer 3

RIGID retainers, struts or plates engage the .01 undercuts

Question 4

is the path of placement straight?

Answer 4

no

Question 5

do you need facial undercuts for K IVs?

Answer 5

NO! you don’t want them!

Question 6

would distortion be more likely in dual or regular?

Answer 6

regular with clasps because with dual you have rigid retainers

Question 7

describe lateral path of placement?

Answer 7

-for Class IIs and IIIS without mod spaces. You need ONE DENTATE SIDE basically
-Palatal or lingual plating ENGAGE .01 undercuts on the FULLY DENTATE side
-Occlusal rest is connected to retentive plating or struts
-

Question 8

where is the occusla rest connected to on the lateral path of placement?

Answer 8

occlusal rest conencting to retentive plating or struts

Question 9

is a reciprocal element required?

Answer 9

no

Question 10

what engages first to stabilize?

Answer 10

rest,

then retentive plate or strut rotates into the undercut without any deformation or pressure on the abutment teeth

Question 11

Indications for rotational path PRDPs in the sagittal plane???

Answer 11

Use for Mx/MN class IVs without mod spaces where visible clasping is not an option. AP Path
-MN class IIIs with medially tipped molar abutments and bilateral edentulous segments. (PA PATH)

Question 12

indications for the FRONTAL plane?

Answer 12

for MX/MN class IIs (lateral path)
-Class IIIs (unilateral) with no mod spaces (lateral path)
LATERAL path? = frontal plane)

SO BASICALLY if I say frontal or lateral I am talking bout II and III with no mod spaces? you need one dentate side.

Question 13

insertion and removal for a lateral ?

Answer 13

left to right,

right to left. remove in the opposite ways

Question 14

Describe the POSTERIOR –> Anterior path of insertion?

Answer 14

-Use for MAN class III with medially tipped molars (you would obviously want to seat on the oddly shaped molar first)
-the mesial plate is on THAT mesial tipped moral (.01) with NO CLASPS
-specially designed occlusal rests…
— extent the oxxluasal (CHANNEL) rest of the MN molar abutments. Depth should be 1.5-2 mm
The floor of rest is PERPENDICULAR to the long axis of the tooth.
-length should be greater than the facial lingual dimension of abutment tooth.
Asymmetric outline
-Faciala nd lingual walls are parallel- intimate contact of rest and the minor connector

–rests are first to engage and stabilize.
retentive palte or strut rotates into undercut.

Question 15

when would you use AP path of placement?

Answer 15

this is for MX/MN class IV!

• NO need for anterior clasping
• anterior abutments: canines or 1st/2nd premolar with .01 mesial undercuts
• place cingulum rests on canines
• YOU might be able tp lace bicuspid occlusal rests?
• –these would be on the mesiaoocclusal of abutment teeth (1st and 2nd premolars) OR messy occlusal of 2nd premolars with 1st premolar abutments…..

Question 16

where are the Anterior abutments on class IV?

Answer 16

put them on the canines or 1st/2nd premolar with .01 mesial undercuts.

Question 17

what are the options for occlusal rests for MX/MN class IV PRPDS?

Answer 17

you can place them either on the MO of the abutment teeth (1st/2nd premolars)
or MO of the 2nd pre molar with 1st PM abutment!

Question 18

describe the cingulum rest preparation for MX canines if using AP path of placement?

Answer 18

you will have depth of 1.5
prep may require restorations
CHEVRON shaped strug

Question 19

describe the path of insertion for AP ?

Answer 19

initial straight path of insertion prior to rotation. the retentive plate and STRUT ENGAGE SIMULTANEOUSLY! unlike the other two

-no requirement for reciprocation due to rest seat configuration

Question 20

describe the posterior abutments for AP path of placement in class IV?

Answer 20

-you will have abutments on the 1st or 2nd molar with mesial OR distal rests bilaterally and circumferential clasps

Question 21

what kind of major connector would you use for class IV?

Answer 21

horseshoe on the MX

Lingual bar on the MN