Introduction: Digital scanners and software may be used to measure mesial-distal (MD) tooth width for orthodontic diagnosis and treatment planning. Although there have been many studies performed on different digital scanners, accuracy of mesial-distal tooth measurements using the Ortho Insight 3D scanner and its software (Motionview Software LLC) has not been reported. Purpose: The objective of this study was to determine if the MD tooth measurements from the digital models scanned by Ortho Insight 3D are accurate compared to the measurements taken directly from the teeth and models with a digital caliper. Material and Methods: Individual MD tooth measurements were taken with a digital caliper on maxillary and mandibular plastic teeth. These teeth were then set in wax, with varying degrees of crowding and scanned with the Ortho Insight 3D. The corresponding digital models were measured with the software. Impressions were then taken of the set ups, scanned and poured in dental stone. The resulting digital models from the scanned impressions and casts were measured. The dental stone models were also measured with a caliper. In total, three digital models were created for each of the set ups and a comparison was made between the individual, software, and cast measurements of teeth to determine the accuracy of the Ortho Insight 3D measurements. Statistical Analysis: An Intraclass correlation coefficient (ICC) was used to compare resulting MD measurements from the different digital models to the caliper measurements to determine agreement. The model teeth, digital models, and casts were re-measured for reliability using Cronbach's Alpha. Bland-Altman plots were used to visualize the results and illustrate whether or not the resulting measurements of Ortho Insight 3D were statistically and clinically accurate. Results: Measurements made from the Ortho Insight 3D showed a statistically and clinically significant correlation and agreement with reference measurements, accurate within two standard deviations per arch. Findings indicated that traditional measurements using calipers on stone models and digital measurements on scanned stone models were more accurate than digital measurements on scanned impressions. Conclusions: The accuracy of MD tooth widths measured with the Ortho Insight 3D scanner are clinically acceptable and can aid in orthodontic clinical diagnosis and treatment planning.

LLU Discipline

Orthodontics and Dentofacial Orthopedics


Orthodontics and Dentofacial Orthopedics


School of Dentistry

First Advisor

Leggitt, V. Leroy

Second Advisor

Caruso, Joseph

Third Advisor

Rungcharassaeng, Kitichai

Degree Name

Master of Science (MS)

Degree Level


Year Degree Awarded

January 2012

Date (Title Page)




Library of Congress/MESH Subject Headings

Tooth; Radiography, Dental, Digital; Tomography Scanners;

Subject - Local

Tooth measurements; Ortho Insight 3D Digital Scanner



Page Count

63 p.

Digital Format


Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.


Loma Linda University Electronic Theses & Dissertations

Collection Website



Loma Linda University. Del E. Webb Memorial Library. University Archives