implant design and characteristics

Question 1

What are the 3 parts which make up the body design of an implant?

Answer 1

1. The Endosseous Part - lies within the bone.
2. Transmucosal Section - lies in the soft tissues between the bone and oral cavity.
3. Prosthodontic Interface

Question 2

What is the primary function of an implant?

Answer 2

To serve as anchorage for prosthodontic reconstruction.

Question 3

What is the definition of an abutment?

Answer 3

Serves as support/retention for a dental prosthesis.

Question 4

What are one-piece implants?

Answer 4

Implants that provide all or part of the prosthesis platform.

Question 5

What are 3 features of a one-piece implant?

Answer 5

1. Transmucosal section which extends into the oral cavity.
2. Fixed neck design.
3. Built-in emergence profile.

Question 6

What is a two-piece implant?

Answer 6

Implants where the prosthodontic platform is provided by a separate abutment component.

Question 7

Where is the two piece implant designed to stop?

Answer 7

At bone level.

Question 8

In what areas of the mouth would a two-piece implant be useful in?

Answer 8

In sites with limited dimensions and aesthetic concerns.

Question 9

What are the 2 types of implant connection?

Answer 9

Internal and External Connections.

Question 10

Internal connections vary from straight-sided to tapered. What is the advantage of a tapered internal connection?

Answer 10

1. Greater intimacy of fit to the abutment.
2. Provides greater stability under load.

Question 11

External connection implants generally offer a flat shoulder for a butt fit against the abutment. What are some potential disadvantages of this?

Answer 11

Less precision of abutment fit and stability under load.

Question 12

How far above the bone crest does the prosthodontic interface sit in one-piece implants?

Answer 12

2-3mm

Question 13

What is the distance to the bone crest from the prosthodontic interface in one piece implants known as?

Answer 13

Vertical Offset

Question 14

What type of connection is created when the implant and abutment have matching diameters?

Answer 14

Butt Joint

Question 15

When a 2 piece implant contains an implant and abutment with non-matching diameters, what is this known as?

Answer 15

Horizontal Offset

Question 16

Which type of implant prosthodontic interface avoids inflammation at the bone crest and allows for stable bone levels?

Answer 16

Vertical Offset

Question 17

A matching diameter (butt joint) is associated with an inflammatory response and how many mm of bone loss?

Answer 17

1.5-2mm

Question 18

Which implant prosthodontic interface moves the bacterial infiltrate away from the bone crest and reduces bone loss to 0.5mm?

Answer 18

Horizontal Offset

Question 19

Key Learning Points for Variations in Implant Prosthodontic Interface:

Answer 19

1. One-Piece implants provide all or part of the prosthodontic platform and their transmucosal design offers a vertical offset which promotes stable bone levels.
2. Two-Piece implants are designed to stop at bone level and the prosthodontic platform is provided by a separate abutment to offer more prosthodontic flexibility.
3. A matching diameter is associated with greater crystal bone loss than a horizontal offset.
4. An Internal Tapered Connection to the abutment offers a more intimate fit and stability under load than straight side and external connections.