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. 2023 Sep 4:12:49.
doi: 10.4103/jos.jos_14_23. eCollection 2023.

Quantitative assessment of root resorption in TAD-aided anchorage with and without RAP: A CBCT study on en masse retraction cases

Amala Rita Jose  1 , Nillan K Shetty  2 , Sneha Shalu  3 , K Amritha Prasad  1 , Thankam C Susan  4 , Suhani Sudhakar Shetty  5
Affiliations

Quantitative assessment of root resorption in TAD-aided anchorage with and without RAP: A CBCT study on en masse retraction cases

Amala Rita Jose et al. J Orthod Sci. .

Abstract

Introduction: The purpose of this study was to evaluate the amount of root resorption with mini implant-aided anchorage, with and without inducing the regional acceleratory phenomenon (RAP) in en masse retraction cases using cone-beam computed tomography (CBCT).

Methods: Thirty patients requiring therapeutic extraction of all first premolars were included in the study and randomly divided into two groups of fifteen patients each (groups I and II). Patients of both groups underwent retraction using mini implants. In patients of group II, the RAP was initiated before starting retraction. For each patient, CBCT of the maxillary and mandibular anterior region was taken before treatment and after retraction to evaluate root length changes.

Results: The amount of root resorption post-retraction was lesser in group II as compared to group I for the maxillary canine, mandibular canines, and mandibular lateral incisors. When the amount of root resorption was scored according to the Malmgren index, a greater percentage of teeth in group I (17.8%) showed root resorption of score of 3 as compared to group II (6.1%).

Conclusion: The results of the study show that the RAP caused reduced root resorption, but its effect was localized to the area where it was induced. When mini implants are used for absolute anchorage during en masse retraction, the RAP can be induced to reduce the root resorption that results from increased treatment time associated with implant-aided retraction.

Keywords: Mini implants; regional acceleratory phenomenon; root resorption.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
Undermining of interdental bone and retraction: (a) position of grooves, (b) placement of grooves to initiate RAP, and (c) the placement of crimpable hooks and retraction using TADs
Figure 2
Figure 2
Image analysis for root length measurement: (a) axial view, perpendicular to the long axis of maxillary right central incisor; (b) coronal view; (c) sagittal view; (d) reference line 1; (e) reference line 2; (f) corresponding sagittal view; and (g) perpendicular distance
Figure 3
Figure 3
Malmgren index score
See this image and copyright information in PMC

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