Do Type and Shape of Scan Bodies Affect Accuracy and Time of Digital Implant Impressions?

Page Start
Page End
  • Dr. Maryam Moslemion
  • Dr. Leila Payaminia
  • Dr. Hamid Jalali
  • Prof. Marzieh Alikhasi


Objectives: Reports concerning the accuracy of intraoral digital impression systems
are limited. This study aimed to assess the effects of scan body types and shapes on
digital impression accuracy and scanning time in all-on-four restorations. Methods: This
in vitro study was conducted with two acrylic maxillary models. Two implant systems
with different connection types (internal trilobe and external hexagon connection) were
inserted according to the all-on-four design. Scanning was performed using Doowon,
NT-Trading, and DESS scan bodies. Changes in implants’ positions (∆R) and angulation
(∆A), and the implants’ distance from the reference pin (∆D) compared with the actual
model were determined. Scanning times were also measured and compared. Results:
The effects of implant connections and scan bodies on ∆R and ∆A were significant (p
<0.05). Implant angulation could also affect ∆A (p=0.019). ∆D was only affected by scan
body (p <0.001). The three scan bodies were significantly different in terms of scanning
time (p=0.001). Conclusion: The results showed that scan body type and shape, and implant connection and angulation could affect digital impression accuracy in all-on-four
restorations. For both internal and external connections, the NT-Trading and DESS scan
bodies had the shortest and longest scanning times, respectively.

Dental Implants
Dental Impression Technique
Dental Models