hawley retainer

1. Prepared and Presented by:
WRia S. Rasheed

2.  Howley retainer
- Uses
- Components:
- Advantages:
- Disadvantages:
 Vacuum retainer:
- Advantages
- Disadvantages

3.  There are three basic types of retainers:
 Hawley Retainers
 Vaccum (Essix)Retainers
 Permanent Retainers

4.  Hawley retainer: it is labially situated
component of removable appliance which
could be active or passive , made of 0.7 mm
stainless steel wire.

5.  Uses:
Passive Hawley : used to retain incisors and
canines in their position after active orthodontic
treatment .

6.  Components:
A
B
C

7.  Advantages:
1. This retainer is fabricated in a lab. So, chair
time is negligible.
2. Due to its versatility, it is very easy to
modify and adjust. (adjustability )
3. This retainer can serve needs for
years.(durability )

8.  Disadvantages:
1. Needs patients compliance
2. Visible (un_esthetic)
3. Interproximal wire may cause spaces
4. High incidence of breakage
5. It may have a slight negative effect on the
speech.

10.  Essix (Vaccum) Retainers:
- are removable retainers that are made entirely of
transparent plastic.
- These retainers are designed to maintain the new
position of your teeth, It is 0.2 or 0.3 mm thick .

15.  Advantages:
1. Esthetic
2. No interference with speech
3. High strength
4. Minimal bulk
5. Inexpensive
6. Quick fabrication

16.  Disadvantages:
1. At first, It may induce salivation
2. Breakage ( in patients that have bruxism)
3. Non-adjustable
4. They can affect speech
5. They can get distorted by heat. This can
cause cracks or tears.