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Multibracket appliance: impression defaults and their reduction by blocking-out  -  a three-dimensional study.

Abstract：

OBJECTIVES:This study examines accuracy of dental impressions and following plaster models taken during treatment with fixed appliances. MATERIALS AND METHODS:A maxillary typodont was provided with brackets. Three examiners took impressions three times each of the variants: brackets only, archwire fixed by alastics, ligatures or Kobayashi-hooks, and brackets and archwire covered completely or just on the gingival side by protection or impression wax. Casts were scanned using Activity102(®). Virtual models were compared to the scan of the typodont using Comparison(®). Differences were measured and descriptively analyzed. Estimated means with 95% confidence intervals were computed. Significance was assessed using linear mixed models. RESULTS:While pyramidal reference blocks had a mean difference of 0.019 mm (95% CI = 0.017-0.021 mm) to the master model, teeth without attachments showed 0.097 mm (95% CI = 0.082-0.111 mm), and teeth with brackets 0.169 mm (95% CI = 0.156-0.182 mm) (p < 0.001). Smallest mean was found when using protection wax only on the gingival bracket side (0.152 mm (95% CI = 0.113-0.192 mm)). Incisors deviated most (0.258 mm (95 % CI = 0.239-0.277 mm)). CONCLUSIONS:Teeth with brackets make impressions more inaccurate because of undercuts. Removing the archwire before taking the impression or covering the brackets on the gingival side shows tendencies toward better precision. CLINICAL RELEVANCE:Taking impressions during treatment with fixed appliances, some inaccuracy has to be taken into account.

journal_name

Clin Oral Investig

journal_title

Clinical oral investigations

authors

Wriedt S,Foersch M,Muhle JD,Schmidtmann I,Wehrbein H

doi

10.1007/s00784-015-1514-4

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

365-72

issue

2

eissn

1432-6981

issn

1436-3771

pii

10.1007/s00784-015-1514-4

journal_volume

20

pub_type

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