Tutein Nolthenius, H.E. (2011) The accuracy of the digital Lava COS scanner for tooth width measurements in Orthodontics : A Pilot Study. thesis, Dentistry.
![[img]](https://umcg.studenttheses.ub.rug.nl/style/images/fileicons/text.png) |
Text
Tutein.pdf Restricted to Registered users only Download (19MB) |
Abstract
Introduction: The purpose of this pilot-study was to determine the accuracy of the Lava COS scanner. This was done by comparison of the results of tooth width measurements for Bolton analyses obtained by digital Lava COS models and Digimodel. These measurements were compared with measurements made on the plaster models (golden standard). Methods: Two alginate impressions of both arches of 10 patients were taken; one was used to make the conventional plaster model, the other to scan and produce the DigiModel. With the Lava COS scanner an additional digital model was made. The mesio-distal widths of these three models were measured to the nearest 0. 01 mm by three different examiners. Reproducibility was assessed with the Intraclass Correlation Coefficient. The difference between the methods was calculated, and a paired samples t-test was used to analyze the data. Also the scanning time of the Lava Cos was recorded. Results: The Intraclass Correlation Coefficient values all exceeded 0.75, demonstrating a good interobserver correlation. The average difference of the tooth width between measurements of the DigiModel and the plaster models was 0.004 mm, and for the Lava COS model it was 0.04 mm. Most of the mean differences in tooth-size measurements were not statistically significant (P>0.05). The difference in Anterior Bolton Ratio was statistically not significant, for both the Lava COS model as well as the DigiModel. But the differences in the Overall Bolton Ratio were statistically significant; however comparison of absolute measurements of Overall Bolton Discrepancies showed no statistical difference and these were considered not to be clinically significant. The average time needed to scan a patient with the Lava COS was 27.3 minutes. The last measurement took 18 minutes. The fastest scan took 14 minutes. Since there was a learning curve, at the end the needed scanning time seems practically comparable the time needed to make two alginate impressions. Conclusion: It appears that the Lava COS scanner is an accurate, reproducible and efficient method for recording, storing and measuring dental study models that eventually may replace the use of conventional plaster models and Digimodels in Orthodontics.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Supervisor: and Wiranto, M.G. D.D.S. |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:44 |
| Last Modified: | 25 Jun 2020 10:44 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/537 |
Actions (login required)
 |
View Item |