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Open Access 01-03-2021 | Original Article

Accuracy of fully guided orthodontic mini-implant placement evaluated by cone-beam computed tomography: a study involving human cadaver heads

Authors: Kristian Kniha, Maximilian Brandt, Anna Bock, Ali Modabber, Andreas Prescher, Frank Hölzle, Golamreza Danesh, Stephan Christian Möhlhenrich

Published in: Clinical Oral Investigations | Issue 3/2021

Abstract

Objectives

The aim of this study was to evaluate the accuracy of fully guided orthodontic mini-implant (OMI) placements supported by tooth- (TBGs) or gingiva-borne silicone guides (GBGs) based on virtually superimposed lateral cephalograms on virtual plaster models.

Materials and methods

Lateral cephalograms and corresponding plaster models were virtually superimposed for the planning of OMI positions; fully guided TBGs and GBGs were fabricated (each, n = 10). A total of 40 OMIs were inserted in a paramedian position into the palate of 20 human cadavers. Postoperative cone-beam computer tomographies (CBCTs) were carried out, and an accuracy evaluation was performed by comparing preoperative planning models and postoperative CBCTs. Deviations of the axis, tip, centre of the shoulder and vertical position of each of the implants were evaluated. Furthermore, the transfer accuracy measured by postoperative CBCT scans were compared with the accuracy determined using an intraoral scanner.

Results

A significant deviation between TBGs (2.81° SD 2.69) and GBGs (6.22° SD 4.26) regarding implant angulation was evaluated (p = 0.005). Implant tip and implant shoulder deviations revealed no statistical differences between the guides. Accuracy values of oral scans regarding vertical deviations were significantly more inaccurate when compared with CBCTs (p < 0.001).

Conclusions

The accuracy of an OMI position can be significantly increased by using a guide extension over the teeth. Vertical implant positions presented the lowest deviations. Postoperative oral scans and CBCTs represent diverging accuracy measurements when compared with virtual planning.

Clinical relevance

Users must keep in mind that despite virtual planning deviations, inaccuracies of a few millimetres may occur.

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Title: Accuracy of fully guided orthodontic mini-implant placement evaluated by cone-beam computed tomography: a study involving human cadaver heads
Authors: Kristian Kniha
Maximilian Brandt
Anna Bock
Ali Modabber
Andreas Prescher
Frank Hölzle
Golamreza Danesh
Stephan Christian Möhlhenrich
Publication date: 01-03-2021
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 3/2021
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-020-03436-9

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Accuracy of fully guided orthodontic mini-implant placement evaluated by cone-beam computed tomography: a study involving human cadaver heads

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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