University of Oulu

Sigurd Hadler-Olsen, Anders Sjögren, Jeanett Steinnes, Mari Dubland, Napat Limchaichana Bolstad, Pertti Pirttiniemi, Heidi Kerosuo, Raija Lähdesmaki; Double vs single primary tooth extraction in interceptive treatment of palatally displaced canines:A randomized controlled trial. Angle Orthod 1 November 2020; 90 (6): 751–757. doi:

Double vs single primary tooth extraction in interceptive treatment of palatally displaced canines : a randomized controlled trial

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Author: Hadler-Olsen, Sigurd1; Sjögren, Anders2; Steinnes, Jeanett3;
Organizations: 1Public Dental Health Service Competence Centre of Northern Norway, Postboks 2406, 9271 Tromsø, Norway
2Institute of Clinical Dentistry, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
3Public Dental Health Service Competence Centre of Northern Norway, Tromsø, Norway
4Private Practice, Bryne, Norway
5Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: EH Angle Education and Research Foundation, 2020
Publish Date: 2021-03-11


Objectives: To compare the impact of primary canine and primary first molar extractions with extractions of only the primary canine regarding correction of palatally displaced canines (PDCs).

Materials and Methods: Thirty-two children aged 9.5–13.5 years with 48 PDCs were randomly allocated to either the double-extraction group (DEG) or single-extraction group (SEG). Clinical and radiographic examinations were performed at baseline and at 6-month intervals until the canine emerged or orthodontic treatment was started. Outcome measures were: emergence of maxillary canine (yes/no), emergence of maxillary canine into a favorable position (yes/no), and maxillary canine positional change (angulation and sector). Factors influencing PDC emergence were analyzed using logistic regression.

Results: In the DEG, 64% (16/25) of canines emerged into the oral cavity vs 78% (18/23) in the SEG (P = 0.283). Favorable PDC position at trial end was seen in 64% (16/25) of the DEG vs 57% (13/23) of the SEG (P = 0.600). Significant distal movement of PDCs was recorded in the DEG and SEG, though no significant difference was observed between groups. Significant predictors of canine emergence were initial canine angulation (Angle A) (P = 0.008) and space conditions at T₀ (P = 0.030).

Conclusions: Double or single primary tooth extraction procedures are equivalent in supporting PDC eruption into the oral cavity and into a favorable position in the dental arch. Initial canine angulation and space assessments may be used as predictors of successful PDC eruption.

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Series: Angle orthodontist
ISSN: 0003-3219
ISSN-E: 1945-7103
ISSN-L: 0003-3219
Volume: 90
Issue: 6
Pages: 751 - 757
DOI: 10.2319/031920-196.1
Type of Publication: A1 Journal article – refereed
Field of Science: 313 Dentistry
Copyright information: © 2020 by The EH Angle Education and Research Foundation, Inc. The Foundation invites users to read, download, copy, distribute, print, search, or link to the articles published in The Angle Orthodontist, provided all use is for non-commercial purposes and proper attribution is made to the source as being "The Angle Orthodontist.