Open Access Study protocol

Influence of time after extraction on the development of gingival invagination: study protocol for a multicenter pilot randomized controlled clinical trial

Christoph Reichert1*, Eric Kutschera1, Manuel Nienkemper2, Sven Scharf3, Martin Mengel4, Rolf Fimmers5, Christine Fuhrmann4, Christina Plötz1, Lina Gölz1, Dieter Drescher2, Bert Braumann3 and Andreas Jäger1

Author Affiliations

1 Department of Orthodontics, University Hospital Bonn, Welschnonnenstraße 17, 53111, Bonn, Germany

2 Department of Orthodontics, University Hospital Düsseldorf, Moorenstraße 5, 40225, Düsseldorf, Germany

3 Department of Orthodontics, University Hospital Cologne, Kerpener Straße 32, 50931, Köln, Germany

4 Clinical Study Support Core, University Hospital Bonn, Sigmund-Freud-Straße 25, 53015, Bonn, Germany

5 Institute for Medical Biometry, Informatics and Epidemiology Bonn, Sigmund-Freud-Straße 25, 53015, Bonn, Germany

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Trials 2013, 14:108  doi:10.1186/1745-6215-14-108

Published: 24 April 2013

Abstract

Background

Gingival invaginations are a common side effect of orthodontic therapy involving tooth extraction and subsequent space closure. Consequences of gingival invaginations are a jeopardized stability of the space closure and hampered oral hygiene. In a retrospective study, the factor time until initiation of orthodontic space closure after tooth extraction has been identified as a potential risk factor for the development of gingival invaginations. The aim of this pilot study is to proof this hypothesis and to enable a caseload calculation for further clinical trials. The referring question is: is it possible to reduce the number of developing gingival invaginations by initiation of orthodontic space closure after tooth extraction at an early point of time?

Design

The intended pilot study is designed as a multicenter randomized controlled clinical trial, comparing the impact of two different time intervals from tooth extraction to initiation of orthodontic space closure on the development of gingival invaginations.

Forty participants, men and women in the age range of 11 to 30 years with orthodontically related indication for tooth extraction in the lower jaw, will be randomized 1:1 in one of two treatment groups. In group A the orthodontic tooth movement into the extraction area will be initiated in a time interval 2 to 4 weeks after tooth extraction. In group B the tooth movement will be initiated in a time interval >12 weeks after extraction. A possible effect of these treatment modalities on the development of gingival invaginations will be documented at the moment of space closure or 10 months +/- 14 days after initiation of space closure respectively, by clinical documentation of the primary (reduced number of gingival invagination) and the secondary endpoint (reduction of the severity of gingival invaginations).

Trial registration

Universal Trial Number U1111-1132-6655; German Clinical Trials Register DRKS00004248

Keywords:
Gingival invagination; Tooth extraction; Orthodontic tooth movement; Space closure; Time; Clinical trial