Date of Graduation


Document Type


Degree Name

Bachelor of Science in Biomedical Engineering

Degree Level



Biomedical Engineering


Ungar, Peter


This study sought to develop a novel method to quantitatively characterize non-carious cervical lesions (NCCLs) using an intraoral scanner (IOS) paired with Geomagic Wrap mesh software. The goal was to compare results with those obtained using an optical profilometer and Proscan superimposition software for clinical application. Comparisons were made using a previously published dataset aimed at measuring tooth loss associated with differing toothbrush and toothpaste types. Results show good comparability between methods and confirm that variation in brush stiffness and paste abrasivity result in significantly and predictably different levels of NCCL development. Extracted human maxillary premolars were assigned to one of twelve different treatment groups that consisted of three different toothbrush stiffnesses (soft, medium, hard) and four kinds of toothpaste/slurries of varying abrasivity (none, lower, medium, higher). Premolars were mounted in groups of two (left and right) and a portion of their root surfaces was covered with acrylic resin to simulate the gingiva while leaving ~2mm of surface apical to the cementoenamel junction (CEJ) exposed to serve as the brushing surface. Specimens were then brushed according to their assigned group parameters for 35,000 and 65,000 double- strokes (forward and backward motion). Impressions of the unbrushed specimens were taken to serve as baselines and again after both brushing intervals which were subsequently scanned using an IOS. Volume loss was analyzed using Geomagic Wrap 3D by both an experienced and inexperienced observer. The data were then analyzed using a log-linear statistical model. Data from the experienced and inexperienced observers showed good repeatability and the results of the ANOVA tests showed similar effects of treatment when compared to the original study. An IOS paired with Geomagic Wrap is a viable and clinically relevant method to characterize the development and progression of NCCLs.


non-carious cervical lesion, abfraction, intraoral scanner, toothbrush, dentifrice, abrasivity