Root repair after damage due to screw insertion for orthodontic miniplate placement

Marie A Cornelis; Michele Tepedino; Paolo M Cattaneo; Catherine Nyssen-Behets

doi:10.4317/jced.56472

Root repair after damage due to screw insertion for orthodontic miniplate placement

J Clin Exp Dent. 2019 Dec 1;11(12):e1133-e1138. doi: 10.4317/jced.56472. eCollection 2019 Dec.

Authors

Marie A Cornelis¹, Michele Tepedino², Paolo M Cattaneo³, Catherine Nyssen-Behets⁴

Affiliations

¹ Associate Professor,Section of Orthodontics, Department of Dentistry and Oral Health, Aarhus University, Faculty of HEALTH, Vennelyst Boulevard 9, 8000 Aarhus, Denmark.
² Associate lecturer, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, Via Vetoio 2, 67100 L'Aquila, Italy.
³ Associate Professor, Section of Orthodontics, Department of Dentistry and Oral Health, Aarhus University, Faculty of HEALTH, Vennelyst Boulevard 9, 8000 Aarhus, Denmark.
⁴ Professor, Pôle de Morphologie, Institut de Recherche expérimentale et clinique, Université catholique de Louvain, Avenue Mounier 52 bte B1.52.04, 1200 Brussels, Belgium.

Abstract

Background: The aim of this investigation was to describe the healing reactions following root damage caused by placement of a miniplate anchorage system.

Material and methods: In 4 beagle dogs, 4 titanium miniplates (2 self-tapping screws per miniplate) were placed in each maxilla, after drilling of pilot-holes. Six fixation screws were unintentionally inserted damaging the root of maxillary canines. Two weeks later, half of the miniplates were loaded with a coil spring. Two dogs were euthanized 7 weeks after placement of the miniplates, while the remaining two after 29 weeks. Histological sections were prepared, microradiographed, observed under U.V. light, then stained and analysed under ordinary light.

Results: Four screws caused direct root damage; one was damaged during the drilling process; one caused damage to the periodontal ligament only. Among these 6 screws, 2 were mobile and 4 were stable at sacrifice. Limited root damage showed some repair after 29 weeks, consisting in a thick layer of mineralized cementum including anchoring periodontal fibres. Tissue repair was not related to screw stability or loading status.

Conclusions: Limited root damage has shown potential to heal, while extensive root damage has not. Precise position of insertion of the miniplates is thus of utmost importance. Key words:Temporary anchorage devices, animal studies, root resorption.