Retention

Question 1

After ortho is completed, there are short-term dental changes as soft tissue fibers reorganize. How long does this take for the PDL? Gingival fibers? Supracrestal fibers?

Answer 1

PDL = 3-4 months
Gingival fibers = 4-6 months
Supracrestal fibers = +1year

Question 2

Retainer that has:
- incisors retention –> labial bow from canine to canine
- Adam clasps –> undercuts for molar retention
- acrylic on palate
- occlusal surfaces of teeth are free to erupt

Answer 2

upper Hawley retainer

Question 3

Retainer that has:
- acrylic on lingual
- clip-on bar from canine to canine

Answer 3

lower Hawley retainer

Question 4

type of retainer in which a wire is bonded to the lingual surface of anterior teeth (usually mandibular canines or maxillary central incisors)

Answer 4

lingual bonded retainer

Question 5

retainers recommended to prevent open bite relapse

Answer 5

• Upper Hawley retainer with posterior bite block
• Vacuum-formed retainer with thicker plastic on posterior occlusal surfaces separates the jaw

Question 6

retainer used to prevent a deep bite relapse

Answer 6

upper Hawley retainer with anterior bite plate