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- Edman Tynelius, Gudrun, et al.
(författare)
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Five-year postretention outcomes of three retention methods : a randomized controlled trial
- 2015
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Ingår i: European Journal of Orthodontics. - : Oxford University Press. - 0141-5387 .- 1460-2210. ; 37:4, s. 345-353
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Tidskriftsartikel (refereegranskat)abstract
- Objective: Comparison of three different retention strategies 5 years or more postretention. Design, Setting, and Participants: Randomized, prospective, single-centre controlled trial. Forty-nine patients (33 girls and 16 boys) were randomly assigned to one of three retention methods during 2 years by picking a ballot shortly before start of retention treatment. Inclusion criteria were no previous orthodontics, permanent dentition, normal skeletal sagittal, vertical, and transversal relationships, Class I dental relationship, space deficiencies, treatment plan with extractions of four premolars followed by fixed straight-wire appliance. Maxillary and mandibular Little's irregularity index (LII), intercanine and intermolar width, arch length, and overbite/overjet were recorded in a blinded manner, altogether 10 measurements on each patient. Significant differences in means within groups assessed by t-test and between groups by one-way analysis of variance. Interventions: Retention methods: removable vacuum-formed retainer (VFR) covering the palate and the maxillary anterior teeth from canine-to-canine and bonded canine-to-canine retainer in the lower arch (group V-CTC); maxillary VFR combined with stripping of the lower anterior teeth (group V-S); and prefabricated positioner (group P). Results: Maxillary mean LII ranged from 1.8 to 2.6 mm, mean intercanine width 33.6-35.3 mm with a significant difference between groups V-S and P, mean intermolar width 46.8-47.4 mm and mean arch length 21.8-22.8 mm. Mandibular mean LII ranged from 2.0 to 3.4 mm with a significant difference between groups V-S and P, mean intercanine width from 25.4 to 26.6 mm, mean intermolar width from 40.8 to 40.9 mm and mean arch length from 16.9 to 17.3 mm. Mean overbite ranged from 1.8 to 2.7 mm and mean overjet from 3.7 to 4.1 mm. Limitations: A single centre study could be less generalizable. Conclusions: The three retention methods disclosed equally favourable clinical results.
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| 2. |
- Sonesson, Mikael, et al.
(författare)
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Reliability of Assessments of Apical Root Resorption during Treatment with Removable Orthodontic Appliance in Children
- 2018
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Ingår i: HSOA Journal of Dentistry: Oral Health & Cosmesis. - : Herald. - 2473-6783. ; 3:1
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Tidskriftsartikel (refereegranskat)abstract
- Apical Root Resorption (ARR) of the maxillary incisors is an adverse effect in patients during treatment with orthodontic appliance. Limited number of prospective investigations on ARR in patients with Removable Orthodontic Appliance (ROA) is available and the reliability of assessments of ARR in periapical radiographs has not been evaluated. The aims were to investigate 1) Observer agreement regarding assessment of ARR in radiographs obtained during treatment with ROA in children and 2) The extent and severity of ARR in children during treatment with ROA. Material and Methods One hundred ten children, with Angle class II malocclusion or anterior cross bite suitable for treatment with ROA were consecutively recruited. Periapical radiographs of maxillary incisors were obtained before (T0) and after six month of treatment (T1). The contour of the roots was scored as 0, 1, 2, 3 or 4 according to a modified Levander and Malmgren index, by five observers. Score 0 represent normal root contour, score 4 severe root resorption. Inter- and intra-observer agreement was calculated as overall agreement and kappa values. Results In the 110 patients, 49 females, 61 males, the mean age was 10.6 years. Totally 439 roots were available for assessment. Kappa values for pair wise inter-observer agreement during treatment ranged between -0.01 and 0.27. Kappa values for intra-observer agreement ranged between -0.09 and 0.45 before treatment and -0.22 and 0.48 after treatment. Conclusion Reliability in assessing root morphology/resorption in periapical radiographs obtained in children during treatment with removable appliance is low. ARR seems to be of minor extent, however, the low reliability indicates difficulties in evaluating the severity and thereby the clinical importance in this young patient group.
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