Repetition Improves Precision and Trueness of Digital Intraoral Scans

Seoul National University Gwanak Dental Hospital

Status: Completed

Conditions: Tooth Diseases

Treatments: Other: impression data from reference scanner; Device: Trios; Device: iTero

Study type: Interventional

Funder types: Other

Identifiers

NCT02868957

ECT14-02A-27

10053907 (Other Grant/Funding Number)

NRF-2013R1A1A1076022 (Other Grant/Funding Number)

Details and patient eligibility

About

The objectives of this study were to compare the precision of two digital intraoral scanners from a series of repeat scan images, and to investigate the effect of the learning curve on changes in trueness when scanning the full arch of the oral cavity in actual patients.

Full description

Study Participants: This study was approved by the institutional review board of Ehwa Womans University Medical Center Mokdong Hospital, and dental hygienists who were suitable for the purpose of the study were selected (ECT14-02A-27). Participants were assigned one of four patients, and subsequently scanned the oral cavity of a single patient 10 times repeatedly over 4 days.

Study Design: The participants visited the dental clinic and performed scanning for 4 days. In order to investigate the difference in the precision and trueness of two types of intraoral scanners, the participants scanned the dental arch of a single patient 10 times using an assigned digital intraoral scanner. On the first day, either of the two types of scanners (iTero and Trios), and a patient were assigned. Then, the participants were trained in theory and practices of the assigned scanner, and subsequently, using it, scanned the dental arch of the assigned patient twice. On the second and third days, the dental arch of the same patient was scanned 3 times respectively, and on the fourth day, the experiment was finished after scanning the same patient twice.

Statistical Analyses: Collected data were analyzed using the SPSS Ver. 20.0 statistical package. For the determination of differences in the deviations according to the scanner, the independent two-sample t-test was conducted to examine the significance of the precision data. For comparisons of trueness according to repeated learning, the repeated measure ANOVA was used to test for differences between the scanners, clinical experience of the participants, and the scanning region within the same scanner group. The significance of time-dependent changes, and the interaction between the scanner group and time variables, were examined by within-subject tests. Differences between the scanner groups were examined by between-subject tests. The significance of the 10 consecutive scans and four visits within the scanner group, and the difference between the scanner groups at each time point, were examined by the post-hoc test, which was performed using the Bonferroni method as a multiple comparison (α= 0.05).

Enrollment: 20 patients

Sex: Female

Ages: 20 to 35 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• The selection criteria for the participants were as follows: they had the clinical experiences between 3 - 11 years, understood the purpose of the study well, gave their consent, and were able to carry out a 4-day learning course. Those who were inadequate to carry out the study mentally or physically.

Exclusion criteria

• Applicant who was considered inappropriate .for this study by the principal investigator was excluded from the selection

Trial design

Primary purpose: Health Services Research

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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20 participants in 3 patient groups

Impression data from reference scanner

Active Comparator group

Description:

desktop scanner was used as a reference scanner. According to the data of the manufacturer, the accuracy is less than 20 µm and the scan points more than 100,000.

Treatment:

Device: Trios

Device: iTero

Trios

Experimental group

Description:

Trios is a scanner with real time rendering type adopting the confocal principle, and scans the object while showing the scanned area on a screen. Interventions: Assigned intervention to participants in this clinical study was in the form of repetitive learning of Trios intra-oral scanner.

Treatment:

Other: impression data from reference scanner

Device: Trios

iTero

Experimental group

Description:

iTero captures teeth and periodontal soft tissue using a red laser beam and parallel confocal imaging technology. This system with a focal depth of 300 can capture up to 100,000 of laser points, and each of such laser points is separated at a 50 mm gap. Interventions: Assigned intervention to participants in this clinical study was in the form of repetitive learning of iTero intra-oral scanner.

Treatment:

Other: impression data from reference scanner

Device: iTero