JVD 2016, Issue 4 (MD)

Question 1

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

When pathology is found with unerupted teeth, ______ is the most common clinical finding

Answer 1

Incomplete dentition

Question 2

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

The three most commonly unerupted teeth in dogs are:

Answer 2

mandP1, mandC, maxC

Question 3

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Definition of impacted teeth:
Definition of embedded teeth:

Answer 3

1st blank: physical obstruction to eruption process

2nd blank: insufficient eruptive force to clear alveolar bone margin

Question 4

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

In humans, the most common type of cyst associated with unerupted teeth is _____, and the most common neoplasm is _____

Answer 4

1st blank: dentigerous cyst

2nd blank: ameloblastoma

Question 5

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

In humans, pericoronal radiolucencies greater than _____ mm considered abnormal

Answer 5

2.5 mm

Question 6

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

True or false: cystic oral lesions typically present with oral pain

Answer 6

False

Question 7

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

What are the 5 criteria proposed for identification of clinically significant, radiographically apparent lesions associated with unerupted teeth?

Answer 7

1. Periocoronal lucency >3x width of normal canine tooth PDL
2. Pericoronal lucency that extends apically beyond CEJ
3. Lucency with thin sclerotic rim of bone surrounding it
4. Expansion of bone lingually, buccally, or above alveolar margin
5. Root resorption/loss of lamina dura of adjacent teeth

Question 8

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Percentage of unerupted teeth that met criteria for cystic lesion

Answer 8

29.1% (62 of 213 teeth)

Question 9

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Age of dogs with cystic lesions of unerupted teeth: range and average

Answer 9

Range: 6 mo- 17 years
Average: 4.33 years

Question 10

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Most commonly unerupted tooth. What percent of all unerupted teeth were this particular tooth?

Answer 10

mandP1; 68.5% (146 of 613)

Question 11

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Percentage of lesions consistent with dentigerous cyst

Answer 11

71.4% (20 of 28)

Question 12

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Other histopath diagnoses obtained

Answer 12

Ameloblastic odontoma (5 and 6 mo), invasive squamous papilloma (10mo) , cystic POF, oronasal cyst, non-diagnostic

Question 13

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

4 most common breeds found to have radiographically diagnosed cystic lesions associated with unerupted teeth

Answer 13

Boxer, pug, shih tzu, boston terrier

These accounted for 85% of all dentigerous cysts

Question 14

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Define the REE (reduced enamel epithelium) and describe its importance in formation of dentigerous cysts

Answer 14

Part of the dental follicle; attached to the CEJ and covers crown of tooth; serves as protective layer and is lost during mastication after eruption; composed of inner layer of ameloblasts which turn into squamous epithelial lining of the cyst if the tooth does not erupt

Question 15

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

Define dentigerous cyst

Answer 15

Cysts associated with the crown of unerupted teeth with a stratified squamous
epithelial lining and lack of keratinization

Question 16

Incidence of Radiographic Cystic Lesions
Associated With Unerupted Teeth in Dogs

True or false: incidence of cystic lesions associated with unerupted mandP1 is higher than for other unerupted teeth

Answer 16

False: incidence is the same but mandP1 is more likely to be unerupted than other teeth

Question 17

Step-by-step: Segmental mandibulectomy in the dog

What is the most common complication associated with the surgery and what are 2 ways to prevent this complication and 2 ways to address this complication after it has already occurred?

Answer 17

Malocclusion due to mandibular drift

1. Elastic training (buccal ipsilateral maxP4 to lingual intact side mandC)
2. Crown extension contralateral mandC
3. Crown heigh reduction + VPT of contralateral mandC
4. Extraction of contralateral mandC

Question 18

Step-by-step: Segmental mandibulectomy in the dog

Using a diamond bur to provide a ____ degree taper of the alveolar margin at the edges of the remaining mandible can help prevent dehiscence.

Answer 18

30-60 degrees

Question 19

Dental implants and incisor bridge placement in a dog

What is an endosseous implant?

Answer 19

Endosseous implant is a surgical component that interfaces with the bone of the jaw or skull to support a dental prosthesis (not taken from the article)

Question 20

Dental implants and incisor bridge placement in a dog

How many phases was this procedure performed in and, in general, what were the phases called?

Answer 20

3 phases (4 anesthetic episodes)

1. Extractions and bone grafting
2. Implant placement
3. Restorative phase
   a. healing abutments placed, impressions taken
   b. prosthesis applied