title: The randomized shortened dental arch study: influence of two different treatments on interdental spacing over 5 years.
abstract: OBJECTIVE
  Being a secondary outcome in a multicenter randomized controlled trial, the present analysis focused on interdental spacing in the shortened dental arch (SDA). The aim was to evaluate changes in interdental spacing in dependence of two different treatments after an observation period of up to 5 years.
  
  
  METHODS
  Patients were either treated with a partial removable dental prosthesis (PRDP) for molar replacement (PRDP group) or according to the SDA concept aiming at a premolar occlusion (SDA group) in a randomized manner. Interdental spacing in the anterior region was measured with gauges and categorized as "0" (<0.1 mm), "1" (<0.5 mm), "2" (0.5-1 mm), and "3" (>1 mm). The statistical analysis was performed with analysis of variance models followed by linear contrast.
  
  
  RESULTS
  Ninety-one patients (SDA n = 41, PRDP n = 50) were included. Changes of interdental spacing were detected in 70.7 % of all cases. A significant difference between the mean score changes was found in the mandible comparing the PRDP group and the SDA group. The respective mean score changes from baseline to 5 years were 0.23 (SD 0.49) for the PRDP group and 0.02 (SD 0.30) for the SDA group (p = 0.023).
  
  
  CONCLUSIONS
  Major interdental spacing could be observed in neither of the groups. The SDA concept resulted in a slightly better outcome.
  
  
  CONCLUSIONS
  When deciding whether to replace missing molars, the present results give further support to the SDA concept.
authors: Department of Prosthodontics and Biomaterials, Center for Implantology, Uniklinik RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany. jkern@ukaachen.de.
authors: Jaana-Sophia
authors: JS
authors: Kern
authors: Department of Prosthodontics and Biomaterials, Center for Implantology, Uniklinik RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany.
authors: Stefan
authors: S
authors: Wolfart
authors: Department for Medical Statistics, Uniklinik RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany.
authors: Ralf-Dieter
authors: RD
authors: Hilgers
authors: Department of Prosthetic Dentistry, University Hospital Carl Gustav Carus, Dental School, Technische Universität Dresden, Fetscherstr. 74, 01307, Dresden, Germany.
authors: Birgit
authors: B
authors: Marré
authors: Department of Prosthetic Dentistry, Johannes-Gutenberg University of Mainz, Augustusplatz 2, 55131, Mainz, Germany.
authors: Herbert
authors: H
authors: Scheller
authors: Department of Prosthetic Dentistry, Albert-Ludwig University of Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany.
authors: Jörg
authors: J
authors: Strub
authors: Department of Prosthetic Dentistry, University Hospital Carl Gustav Carus, Dental School, Technische Universität Dresden, Fetscherstr. 74, 01307, Dresden, Germany.
authors: Klaus
authors: K
authors: Böning
authors: Center for Dental and Craniofacial Sciences Department of Prosthodontics, Geriatic Dentistry and Craniomandibular Disorders, Charité Universitätsmedizin Berlin, CC3, Campus Benjamin Franklin, Aßmannshauser Str. 4-6, 14197, Berlin, Germany.
authors: Wolfgang
authors: W
authors: Hannak
authors: Center of Dentistry, Department of Prosthetic Dentistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
authors: Ralph G
authors: RG
authors: Luthardt
authors: Department of Prosthodontics, University Medical Center Eppendorf, Martinistraße 52, 20246, Hamburg, Germany.
authors: Guido
authors: G
authors: Heydecke
authors: Department of Prosthetic Dentistry, Julius-Maximilians University of Würzburg, Pleicherwall 2, 97070, Würzburg, Germany.
authors: Jan
authors: J
authors: Huppertz
authors: Center for Dental and Craniofacial Sciences Department of Prosthodontics, Geriatic Dentistry and Craniomandibular Disorders, Charité Universitätsmedizin Berlin, CC3, Campus Benjamin Franklin, Aßmannshauser Str. 4-6, 14197, Berlin, Germany.
authors: Peter
authors: P
authors: Pospiech
authors: Department of Prosthetic Dentistry, Justus-Liebig University of Giessen, Schlangenzahl 14, 35392, Gießen, Germany.
authors: Bernd
authors: B
authors: Wöstmann
authors: Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr. 17, 53111, Bonn, Germany.
authors: Helmut
authors: H
authors: Stark
authors: Department of Prosthodontics, Gerodontology and Biomaterials, University Medicine Greifswald, Rotgerberstr. 8, 17487, Greifswald, Germany.
authors: Torsten
authors: T
authors: Mundt
authors: Department of Prosthetic Dentistry and Dental Material Science, Friedrich-Schiller University of Jena, An der alten Post 4, 07740, Jena, Germany.
authors: Florentine
authors: F
authors: Jahn
authors: Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Germany.
authors: Matthias
authors: M
authors: Kern
authors: Department of Prosthodontics, University Hospital of Munich, Goethestr. 70, 80336, Munich, Germany.
authors: Daniel
authors: D
authors: Edelhoff
authors: Department of Prosthetic Dentistry, University Hospital Carl Gustav Carus, Dental School, Technische Universität Dresden, Fetscherstr. 74, 01307, Dresden, Germany.
authors: Michael H
authors: MH
authors: Walter
mesh_terms: D003724:Dental Arch / Q000473:pathology*; D003766:Dental Occlusion; D003834:Denture Precision Attachment; D003832:Denture, Partial, Removable; D005260:Female; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000534:rehabilitation*; D008297:Male; D008963:Molar; D009811:Odontometry; D012307:Risk Factors; D016388:Tooth Loss
keywords: Interdental spacing; Partial removable prosthesis; Premolar occlusion; Shortened dental arch; Tooth migration