Implants

Question 1

(CBCT metal artifacts — Freitas 2018)
How do kVp and MAR settings affect CBCT artifacts?

Answer 1

↑ kVp = ↓ artifacts on CBCT
(+) metal artifact reduction (MAR) setting = ↓ artifacts on CBCT

Question 2

(Luangchana 2015 — vertical measurements)
What issue is noted with 2D radiographs in vertical measurement assessment?

Answer 2

However issue with patient positioning of 2D radiographs

Question 3

(Luangchana 2015 — vertical measurements)
How do CBCT and panoramic radiograph vertical measurements compare to physical measurements?

Answer 3

Both measurements comparable to physical measurements

Question 4

(Vertical measurements in implant planning)
Which imaging modalities are used to obtain vertical measurements?

Answer 4

CBCT and panoramic radiograph

Question 5

(Implant Imaging Goals — Quantitative, volumetric)
Name volumetric measurements relevant to implant imaging (part 2).

Answer 5

Sinus floor lift
Extraction socket
Ridge augmentation

Question 6

(Implant Imaging Goals — Quantitative)
Which spatial relationships are assessed in quantitative implant imaging?

Answer 6

Relationship to occlusion, other structures & implants

Question 7

(Implant Imaging Goals — Quantitative)
What does quantitative implant imaging assess regarding angular relationships?

Answer 7

Angular measurements
Planned drilling trajectory

Question 8

(Implant Imaging Goals — Quantitative)
What does quantitative implant imaging assess in terms of linear dimensions?

Answer 8

Linear measurements
Bone length & width

Question 9

(Implant Imaging Goals — Qualitative)
List the qualitative goals of implant imaging (part 2).

Answer 9

Trabecular pattern
Pathology
Bone density (HU)

Question 10

(AAOMR 2012 — immediate post-op concern)
When is CBCT indicated immediately after implant placement?

Answer 10

CBCT if immediately following placement, patient is symptomatic

Question 11

(AAOMR 2012 — post-operative monitoring)
Is CBCT recommended for periodic post-operative review?

Answer 11

NO CBCT for periodic review

Question 12

(Bone density and implant stability)
What relationship between HU and primary implant stability was reported?

Answer 12

Hounsfield units correlated to primary implant stability

Question 13

What HU value was reported for implant sites?

Answer 13

HU = 556 +/- 80

Question 14

(CBCT data export)
What slice thickness is recommended relative to the voxel size when exporting data?

Answer 14

Data should be exported at a slice thickness equal to the voxel size.

Question 14

(CBCT parameters and detection)
Did increasing kVp and mA improve detection of the mandibular canal?

Answer 14

Did not improve detection of the mandibular canal

Question 15

(CBCT parameters and exposure)
What is the impact on radiation exposure when kVp and mA are increased?

Answer 15

BUT ↑ radiation exposure

Question 16

(CBCT parameters and image quality)
When kVp and mA are increased, what happens to image noise?

Answer 16

↑ kVp and mA = ↓ image noise

Question 17

(Mandibular canal visibility on CBCT)
What sex-based difference in canal visibility was reported?

Answer 17

Less visible in females compared to males

Question 18

(Mandibular canal visibility on CBCT)
In what proportion of cases was the mandibular canal visible?

Answer 18

Visible in just over 50% of all cases

Question 19

(Mandibular canal variations — prevalence)
What is the reported frequency for this variation?

Answer 19

up to 16% of all cases (1 in 6 patients)

here you can see bifid mandibular canal??