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. 2017 Sep;47(3):141-147.
doi: 10.5624/isd.2017.47.3.141. Epub 2017 Sep 21.

Diagnostic efficacy of a modified low-dose acquisition protocol for the preoperative evaluation of mini-implant sites

Affiliations

Diagnostic efficacy of a modified low-dose acquisition protocol for the preoperative evaluation of mini-implant sites

Aditya Tadinada et al. Imaging Sci Dent. 2017 Sep.

Abstract

Purpose: The objective of this study was to compare the outcomes of surgical mini-implant placement when potential mini-implant sites were scanned using a lower-dose 180° acquisition protocol versus a conventional 360° acquisition protocol.

Materials and methods: Ten dentate human skulls were used to provide sites for potential mini-implant placement. The sites were randomly divided into 2 groups: 360° and 180° cone-beam computed tomography (CBCT) acquisition protocols. A small-volume 180° CBCT scan and a 360° CBCT scan of each site were acquired using a Morita Accuitomo-170 CBCT machine and then a mini-implant was placed. A follow-up 360° CBCT scan was done as a gold standard to evaluate the location of the mini-implant and root perforation. Two raters evaluated the scans.

Results: Ninety-eight percent of the mini-implants placed did not perforate any root structure. Two percent of the sites had an appearance suggestive of perforation. On a Likert scale, both raters agreed that their subjective evaluation of the diagnostic quality of the protocols, ability to make and read measurements of the sites, and preferences for the specified diagnostic task were comparable. The Cohen kappa showed high inter-rater and intra-rater agreement.

Conclusion: In this ex vivo study, we found that the 180° rotational acquisition was as effective as the conventional 360° rotational acquisition for the preoperative evaluation of potential mini-implant sites.

Keywords: Cone-Beam Computed Tomography; Dental Implant.

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Figures

Fig. 1
Fig. 1. Play-Doh on the maxilla and mandible simulating soft tissue density.
Fig. 2
Fig. 2. A. Preoperative 360° small volume cone-beam computed tomography (CBCT) rotational scan of the mini-implant placement site. B. Preoperative 180° rotational small-volume CBCT scan of the mini-implant placement site.
Fig. 3
Fig. 3. A. Preoperative volumetric rendering of the 360° small-volume cone-beam computed tomography (CBCT) scan of the mini-implant placement site. B. Preoperative volumetric rendering of the 180° small-volume CBCT scan of the mini-implant placement site.
Fig. 4
Fig. 4. A. Preoperative 360° small-volume cone-beam computed tomography (CBCT) rotational scan of the mini-implant placement site. B. Preoperative 180° small-volume CBCT rotational scan of the mini-implant placement site.
Fig. 5
Fig. 5. Mini-implant site measurements on an axial section of a cone-beam computed tomgraphy scan.
Fig. 6
Fig. 6. Bleeding point simulation on the modelling compound (Play-Doh).
Fig. 7
Fig. 7. Mini-implant in the safe zones in the maxilla and mandible.
Fig. 8
Fig. 8. Postoperative 360° cone-beam computed tomography rotational scan after mini-implant placement.

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