1. 3M True Definition Dental Scanner Field Evaluation
AADR Annual Meeting
Charlotte, NC. Mar 19, 2014
3M True Definition Dental Scanner Field Evaluation
Dr. Zhisheng Yun – Sr. Optical Specialist
Paul Sevcik – Sr. Commercialization Manger

2. Disclosure
Zhisheng Yun and Paul Sevcik are employees of 3M ESPE. We do have a financial interest in the producer of the products represented in the slides.

3. Review of Technologies for Dental 3D Scanner
Active Triangulation Method
Structured Light 3D Technology
Confocal Microscope 3D Technology
Quick 3M/ESPE history - Shared this presentation with a lot of people who don’t know ESPE History – Here for 2 years, but I’m sure Seefeld knows this well.
Sirona Appollo
Sirona Omincam
E4D Nevo
Trios 3Sahpe Scanner

5. 3M Wavefront Sampling Technologies
Wavefront Sampling by Multiple Channel Imaging
A(X,Y, Z)
A1(x1 ,y1)
A2(x2 ,y2)
Image Space f B
Object Space
Disparity
x=x1-x2
Pinhole Camera Model X Y Z
A(X,Y, Z) f
A(x ,y)
Image Space
Object Space

6. Pinhole Camera Model
By pinhole camera model, object space 3D points (X,Y,Z) can be retrieved by the projected points on the image plane (x, y) using a perspective transformation equation: or
(X, Y, Z) are the coordinates of a 3D point in the object space
(x, y) are the coordinates of the projection points in image space
A is a camera matrix, or a matrix of intrinsic parameters
(cx, cy) is a principal point that is usually at the image center
fx, fy are the focal lengths expressed in pixel units

7. Technologies in the 3M True Definition Scanner
3D-in-motion stereo imaging by sophisticated aspheric optics
Employed the latest accelerometer & gyroscope to enable double-tap to start/stop the scan to avoid openings for switches.
Computer vision technologies to create the 3D point cloud.
F-150 Test

8. True Definition Scanner Field Evaluation
Tracking total cases scanned, restorative units, units completed, scan time per quadrant and scan time per full arch from Apr. 2 to Dec. 10, 2012
We are tracking the data of the scans during our filed evaluation

9. True Definition Scanner Field Evaluation
Restoration Tooth Type Tracking
We can see what tooth type did more restorations…

10. True Definition Scanner Field Evaluation
Scan Time Tracking of Mandible Scan, Maxilla Scan, and Bite Scan (Total) for Full Arch Scans
Software improvement domain the scan time.

11. True Definition Scanner Field Evaluation
Case Success Rate (Total: 768 cases)
For 95% Confidence Interval(CI), the lower limit is 99.1% and the upper limit is 100%

12. True Definition Scanner Accuracy Evaluation
Accuracy comparison of Cerec-Bluecam, iTero-Cadent, Trios-3Shape and 3M True Definition Scanner 1 2 3
Upper control limit and lower control limit, Empirical Rule 99.7% Empirical Rule ( 99.7% fall in 3 Standard Deviations)
References:
1) Joerd van der Meer, etc Application of Intra-Oral Dental Scanners in the Digital Workflow of Implantology, PLOS, Vol. 7, P2-8. Department of Orthodontics, University Medical Center Groningen, The Netherlands.
2) J Graham, etc. Evaluation of 3M True Definition Scanner, IADR 2013, Poster 682

13. Acknowledgment We would like to acknowledge the contributions of:
Dave Stegall, Shannon Scott, Jim Graham, Kelly Reff, Todd Deckard, Eric Hansen, Alberto Alvarez and many others
Our co-workers in many locations of the 3M ESPE- this design could not have become a product without their commitment and dedication to excellence, reliability, quality, manufacturing, and marketing