Attachments in Removable Partial Dentures

Question 1

A mechanical device for the retention and stabilization of a prosthesis.

Answer 1

Attachment

Question 2

What is the attachment component on an RPD?

Answer 2

Retainer

Question 3

Why are attachments used?

Answer 3

1) Better esthetics.

2) Increase retention and stability.

Question 4

Housed in the acrylic of the denture.

Answer 4

Patrix

Question 5

Located in the root or an implant.

Answer 5

Matrix

Question 6

Direct retainers are what type of attachment?

Answer 6

Extracoronal

Question 7

Intracoronal direct retainers must be placed parallel to what?

Answer 7

1) Path of Insertion

2) Each other.

Question 8

Kennedy classes where you use an intracoronal direct retainer.

Answer 8

3 and 4

Must be tooth-supported in order to have enough rigidity.

Question 9

Types of intraocoronal direct retainers.

Answer 9

Precision or Semiprecision attachments

Question 10

Type of intracoronal attachment that’s prefabricated and machined.

Precisely fitting components, tolerance to 0.01 mm.

Answer 10

Precision attachment

Question 11

A type of intracoronal attachment that’s cast from plastic/wax patterns by the lab tech.

Answer 11

Semiprecision attachment.

Question 12

What are semiprecision attachments often used for?

Answer 12

As stress-breakers, like in a pier abutment to allow for some rotation on a long-span bridge.

Question 13

Positioned WITHIN the normal contours of the abutment.

Answer 13

Intracoronal attachments.

Question 14

Positined OUTSIDE the normal contours of the abutment.

Answer 14

Extracoronal attachment.

Question 15

Resilient definition

Answer 15

Allows for movement of the prosthesis.

Question 16

This provides retention, but no stability or support.

Answer 16

Extracoronal attachments

Question 17

Attachments used for Class I and II’s.

Answer 17

Extracoronal attachments

Question 18

Rigid or non-rigid connector needed when you have TWO anterior implants connected by a bar?

Answer 18

Non-rigid

Allows the prosthesis to rotate anterior-posteriorly.

Question 19

Rigid or non-rigid connector needed when you have FOUR implants connected by a bar?

Answer 19

Rigid!

Question 20

This attachment allows for 0.4 mm of vertical resiliency.

Answer 20

ERA attachment

Extracoronal Radicular attachment

Question 21

Weird looking attachment.

Answer 21

Dalbo attachment

Question 22

These attachments can direct forces closer to the center of the tooth.

Answer 22

Intracoronal attachments.

Question 23

Disadvantages of attachments.

Answer 23

1) The abutments rewuire crowns.
2) Additional reduction is needed to fir the components (intracoronal).
3) Require a LOT of INTEROCCLUSAL space (4-6 mm).
4) More expensive.

Question 24

How much interocclusal space is needed for attachments?

Answer 24

4-6 mm

Question 25

T/F:

Whenever a conventional clasp assembly can be used, it should be considered as the direct retainer of choice.

Answer 25

True

Question 26

Contraindications for Attachments:

Answer 26

• Poor periodontal health.
• Poor crown to root ratio.
• Compromized endo or restorative conition.
• Poor oral hygiene.
• Inadequate manual dexterity of the patient.