Angle Orthod. 2018 Jan 16. doi: 10.2319/061917-399.12. [Epub ahead of print]
Abstract
OBJECTIVES:
To
investigate the incidence of and contributing factors to open gingival
embrasures between the central incisors after orthodontic treatment.
MATERIALS AND METHODS:
One
hundred posttreatment patients (29 men and 71 women; mean age, 24.7
years) were divided retrospectively into occurrence and nonoccurrence
groups based on intraoral photographs. Based on the severity, the
occurrence group was further divided into mild, moderate, and severe
groups. Parameters from periapical radiographs, superimposed lateral
cephalograms, and study models were compared between the occurrence and
the nonoccurrence groups by using independent t-tests and were also
analyzed on the basis of severity via analysis of variance. Logistic
regression analysis was performed to identify the contributing factors
to open gingival embrasures.
RESULTS:
The
incidence of open gingival embrasures between the central incisors was
22% and 36% in the maxilla and the mandible, respectively. Lingual
movement of the incisors, distance from the contact point to the
alveolar crest after treatment, antero-posterior overlap of the two
central incisors before treatment in the maxilla, and distance from the
contact point to the alveolar crest after treatment in the mandible were
significantly associated with the occurrence of open gingival
embrasures ( P < .05). In the mandible, the amount of intrusion was
significantly related to severity ( P < .05).
CONCLUSIONS:
The
incidence of open gingival embrasures following orthodontic tooth
movement is high. Therefore, attention should be paid to the
contributing factors to prevent or reduce the occurrence of open
gingival embrasures.
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