ABSTRACT

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 = .283). Favorable PDC position at trial end was seen in 64% (16/25) of the DEG vs 57% (13/23) of the SEG (P = .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 = .008) and space conditions at T0 (P = .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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Author notes

a

Research Fellow, Public Dental Health Service Competence Centre of Northern Norway, Tromsø, Norway.

b

Associate Professor, Institute of Clinical Dentistry, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.

c

Orthodontist, Public Dental Health Service Competence Centre of Northern Norway, Tromsø, Norway.

d

Orthodontist, Private Practice, Bryne, Norway.

e

Associate Professor, Institute of Clinical Dentistry, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.

f

Professor, Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu, Oulu, Finland.

g

Professor, Institute of Clinical Dentistry, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.

h

Associate Professor, Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu, Oulu, Finland.