Acquisition of a Digital Intraoral Scanning Device: An Examination of Practice Volume Changes and the Economic Impact via an Interrupted Time Series Analysis.

Objectives: To evaluate the impact of digital scanning in general dental practices and orthodontic practices to determine the percentage of lift, i.e., the percent increase in gross receipts, of Invisalign® treatment starts following the introduction of an iTero® intraoral scanner.

Methods: An interrupted time series analysis was conducted on 48 months (24 pre- and 24 post-scanner introduction) of Invisalign receipt data from 1,871 general practitioner (GP) and orthodontic practices located worldwide. Analyses also explored the presence of a longer shift in the trend of monthly Invisalign receipts after scanner introduction (i.e., pre-post slope change), and projected the impact of the introduction of the scanner within a specific subset of practices (n = 319) that represented North American GPs with low initial practice volumes (i.e., 5 or fewer receipts in the 12 months prior to acquiring the scanner).

Results: For the entire sample, introduction of the iTero intraoral scanner at month 25 showed a significant and abrupt increase in receipts for Invisalign therapy (b = 0.49; p < 0.001). When compared to the counterfactual regression line prediction without the scanner, in month 25 Invisalign practice receipts increased from the predicted value of 2.38 to 2.88, an increase of 20.71%. When the analysis was conducted using only low-volume GP practices in North America, the introduction of the scanner at month 25 also led to a significant and abrupt increase in practice receipts (b = 0.28; p < 0.001), and this increase was still evident 24 months after scanner introduction.

Conclusions: The results show that acquiring an iTero intraoral scanner as a precursor to Invisalign therapy is associated with a significant increase in Invisalign practice receipts. When projected across the first 12 months, this increase amounts to an additional 5.92 receipts for the entire sample (i.e., 1,871 GP and orthodontic practices worldwide) and an additional 3.41 receipts for the subset of 319 low-volume, North American GPs.