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  • 1.
    Konakovic, Damir
    Malmö högskola, Faculty of Odontology (OD).
    Orthodontic diagnostics and measurements on digital study models made with an intraoral scanner2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Introduction: Model analysis has traditionally been carried out on physical plaster models. New technology allows the production of digital models without the need for conventional impressions. The purpose of this study was to evaluate the validity of digital models made with an intraoral scanner, patient experience and different time aspects associated with this technology. Methods: A sample of 20 adults was selected. Plaster models and digital models were obtained from conventional impressions and an intraoral scanning (TRIOS, 3Shape) respectively. The clinical time required for impression taking and intraoral scanning was recorded and the subjects were asked to answer a questionnaire regarding their experience of both methods. Four independent examiners diagnosed malocclusions and performed measurements with a digital caliper on plaster models and by using OrthoAnalyzer Orthodontics (3Shape, Denmark) for digital models. Time required for digital- and conventional model analysis respectively, was recorded. Statistical analysis was performed by using Paired samples t test, crosstabs and frequency analysis. Results: Diagnostics of horizontal-, vertical- and transversal malocclusions with digital models showed high validity. Few statistically significant differences were found for measurements made on digital models compared to direct measurements on plaster models. For a majority of the examiners, digital model analysis was more time consuming than conventional model analysis. Also, clinical time required for intraoral scanning was significantly greater than for conventional impression taking. The subjects preferred conventional impression taking. Conclusions: Digital models made with an intraoral scanner are a reliable method for orthodontic diagnostics and treatment planning. The technique has a number of advantages and is constantly improving but its acceptance depends ultimately on the cost-effectiveness ratio to the individual practitioner.

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