JVD 2020 #2 The Incidence of Radiographic Lesions of Endodontic Origin Associated with UCF of the MX 4th Premolar in Canine Patients; Goodman

Question 1

What did the retrospective study population include?

Answer 1

111 UCF’s & 500 nonfractured (control) MX 4th PMs

Question 2

What was the frequency of lesions of endodontic origin (LEO) in the UCF population versus the control?

Answer 2

24.3% of UCF (27/111)

None, 0% in control

Question 3

What percentage of fractured teeth is the PM4?

Answer 3

29% of fractured teeth is a 4th PM

Question 4

What other factors were found to be significantly associated with tooth fracture?

Answer 4

Weight- avg w UCF 21.5kg, control 14.9kg
Increasing age (for every yr, increased 4.9% chance of having fractured tooth)

Question 5

What is the enamel wall thickness in dogs? And how many dentin tubules per mm square?

Answer 5

0.1-1mm thickness, 50-100K dentinal tubules

Question 6

What are “Lesions of Endodontic Origin? (LEO)”

Answer 6

Radiographic periapical lucency (due to osteoclastic resorption/reduced radiodensity)
increased width of the apical periodontal ligament space
changes in the trabecular bone pattern around the root apex
root resorption

Question 7

What were the most common breeds in the study population?

Answer 7

Mixed breed (144)
Miniature/toy Poodle (33)
Labradors (31)
Chihuahua (27)
Golden Ret. (20)
Dachshunds (20)
Yorkies (20)

Question 8

What is the hydrodynamic theory of dentin sensitivity based on?

Answer 8

Movement of the dentinal tubule fluid surrounding the odontoblastic process that activates pulpal nerve endings resulting in sensitivity or discomfort. If tubules are exposed, small variation in Temp, dehydration, hypertonic solutions and pressure can cause sensivity.