Orthodontic Articles and Wiggs

Question 1

How much force is put on the teeth by the lips vs the tongue?

Answer 1

5g for lip and 5-10 for tongue

Source - JVD 2016`

Question 2

In “Treatment of Bignathic Malocclusions with Multistage Active Force Orthodontic Movements in a Cat” By Lothamer and Soukup in JVD 2016

what is a brief summary?

Answer 2

6 month old cat with mesioverted 104 and labioverted 403 and 404. Used active force to pull 104 back – developed a root dilaceration otherwise fine. Moved within 2 weeks, left in retention for 4. Used lingual arch bar attached to molars to linguovert 404- once moved maintained in position for 3 weeks.

*unclear whether the persistent deciduous canine was 504 or 804 so unclear if it contributed

Question 3

What force is recommended for a tipping movement?

Answer 3

30-60 g

In “Treatment of Bignathic Malocclusions with Multistage Active Force Orthodontic Movements in a Cat” By Lothamer and Soukup in JVD 2016

Question 4

For elastomeric chains, the strength in ounces will be achieved when the material is stretched ____________.

Answer 4

Twice the length of its diameter size.

e.g. a 2 oz 1/4 inch material will reach 2 ounces when it is stretched 1/2 and inch.

Question 5

In Wiggs there are 3 asymmetrical mandibular/maxillary (class 4) malocclusions. What are they and how are they defined?

Answer 5

Maxillary-mandibular asymmetry in rostrocaudal
—one side of face has an over/under bite and other side normal

Maxillary-mandibular asymmetry in side-to-side
–Loss of midline alignment

Maxillary-mandibular asymmetry in dorsoventral
–open bite, abnormal vertical space between arches when mouth is closed

Abbreviations:
Mal4/DV
Mal4/RC
Mal4/STS

Question 6

What is embrication?

Answer 6

Irregularly arranged teeth within an arch due to crowding– tipping, rotation, supraeruption, infraeruption and displaced teeth are all common

Question 7

How are the terms facioversion, labioversion, and buccoversion related
?

Answer 7

Facioversion can be used for any teeth. Labioverison usually used for rostral teeth and buccoversion used for caudal teeth!

Question 8

Continuous force should be limited to remain below that of capillary blood pressure which is what?

Answer 8

20-26 g/cm2 of tooth root surface

Question 9

What are the recommended retainer periods per some articles in JVD and in wiggs?

Answer 9

2-6 weeks for simple movements

4-12 weeks for complex movements

Question 10

Can endodontically treated teeth be moved ?

Answer 10

Yes– a vital pulp is not required, all you need is a healthy PDL

Question 11

Assessment of Temporary Crown Extensions to Correct Linguoverted Mandibular Canine Teeth in 72 Client-Owned Dogs (2012-2016)

JVD 2018, Storli, Reiter

Overview

Answer 11

• 72 Dogs with crown extensions, mean age 6 mos
• No sig. diff in classes of malocclusion
• Mean overall treatment time 42 days
  
  • Graded on severity as well 1-3. 1 required only mild tipping, 2 required moderate tipping, but only tipping!, 3 required more complicated movements.

Question 12

Assessment of Temporary Crown Extensions to Correct Linguoverted Mandibular Canine Teeth in 72 Client-Owned Dogs (2012-2016)

JVD 2018, Storli, Reiter

What was the success rate?

Answer 12

• 77.8% had self retaining functional occlusion
• 20.8% required permanent crown extensions
• Failure in 1 dog, relapsed after TCE removal (8 mos at appliance installation)

Question 13

Assessment of Temporary Crown Extensions to Correct Linguoverted Mandibular Canine Teeth in 72 Client-Owned Dogs (2012-2016)

JVD 2018, Storli, Reiter

what was the complication rate?

Answer 13

• Overall 25% (18 dogs)
  
  • Most common was fractured TCE (12.5%) followed by ulceration, one enamel fracture, and pneumonia

Question 14

Assessment of Temporary Crown Extensions to Correct Linguoverted Mandibular Canine Teeth in 72 Client-Owned Dogs (2012-2016)

JVD 2018, Storli, Reiter

How many dogs needed multiple adjustments/procedures?

Answer 14

• 39% - no adjustment
• 52% - 1 adjustment
• 7% - 2 adjustments
• 1.4% (1 dog) - 3 adjustments

Question 15

Assessment of Temporary Crown Extensions to Correct Linguoverted Mandibular Canine Teeth in 72 Client-Owned Dogs (2012-2016)

JVD 2018, Storli, Reiter

What percent of dogs had persistent deciduous canines?

Answer 15

37. 5% persistent canines
38. 8% had persisent mandibular specifically
39. 7% only had persistent maxillary

Suggesting that factors other than persistent mandibular canines cause LMC.

26% of dogs had LMC extracted.