Implant Restorations 2

Question 1

What are the options for completely edentulous patients?

Answer 1

Overdenture

Fixed prosthesis

Complete denture

Question 2

What are the problems with complete dentures?

Answer 2

Dentures hurt

No retention

With bone resorption less contact points between denture and soft tissue

Denture can compress the metnal nerve in the case where it appears on the alveolar crest

Gag reflex (2 - 3 mm into the soft palate)

Question 3

How does resorption differ between maxillary and mandibular arch?

Answer 3

Centripetal resorption on maxillary arch (Buccally to lingually)

Centrifugal resorption on mandibular arch (Lingually to buccally)

Question 4

What happens to the mental foramen after a lot of mandibular resorption?

Answer 4

It starts to show up on the alveolar crest causing pain in lip and chin due to compression.

Question 5

What are the advantages of implants for completely edentulous patients?

Answer 5

Improved retention and stability

Greater biting forces

Prevents further bone loss (implants stimulate further bone loss)

Question 6

What are the types of implant retained prostheses used in edentulous patients?

Answer 6

Implant-retained overdenture:

Can be supported by mucosa and implant

Can be supported fully by implants

Can be fully supported by mucosa

Question 7

How can overdentures be retained adequately?

Answer 7

Clip-bar

O’ring

Locator

Magnetic

Question 8

What are the types of clip-bars?

Answer 8

Circumferential: Used when you have just 2 implants in the anterior region and posteriorly the overdenture is supported by mucosa.

Parallel wall and ovoid more ideal for full support of overdenture by the implants.

Question 9

What is an O-ring attachment?

Answer 9

A metal ball and rubber ring

Question 10

How often should the rubber ring in an O-ring be chaged?

Answer 10

Ever 6 months because it wears and loses retention over time.

Question 11

When is an O-ring indicated?

Answer 11

Little distance between implants

Large distance between implants

Low vertical space

Question 12

When is an O-ring contraindicated?

Answer 12

Implants not parallel

Mucosa with variable resilience

Implants at different levels

Question 13

What are the parts of a locator?

Answer 13

External retentive element and internal retentive element

Question 14

What are the indications and contraindications for locators?

Answer 14

Same as O’ ring

Question 15

What are hybrid dentures?

Answer 15

Metal bar attached to fake gingiva and teeth.

Question 16

When are hybrid dentures contraindicated?

Answer 16

When oral hygiene isn’t good because they rely on being cleaned in the mouth

Question 17

Why is lip support more achievable on a removable denture compared to an implant retained overdenture?

Answer 17

The buccal flange of the denture fills the space to support the lip.

In an implant retained overdenture, the prosthesis doesn’t have a buccal flap.

Question 18

What factors should be assessed with hybrid dentures?

Answer 18

Lip support

Smile line

Bone volume available

Economic factors

Manual dexterity

Question 19

How can cleaning be made easier for the patient with hybrid dentures?

Answer 19

Convex gingival surface