title: [Stress releasing effect of tissue conditioning materials for interim dentures after implant installation].
abstract: OBJECTIVE
  The main objective of this study was to examine the influence of the thickness and its longitudinal change within the limited denture space on the stress releasing effect for installed implants during the healing period of a two-stage procedure.
  
  
  METHODS
  As for the tissue conditioning material, Tissue Conditioner (Shofu, Kyoto, Japan) with the designated powder liquid ratio was used. The force transmitted to the implant with the material 5 min after the mixing was measured by a miniature pressure sensor in the position of the implant head (Kyowa, Tokyo, Japan). Measurements were repeated with the material preserved in the water for one and two weeks. Load of 2 kg was applied with a 3-mm diameter round tip using a static loading machine for 2 min to the center of the flat type denture model. The model consisted of denture, mucosa, tissue conditioning material and implant where the first three variables were changed as in the oral cavity. Influence of thickness of each variable was examined longitudinally.
  
  
  RESULTS
  Force measured with any thickness of tissue conditioning material was smaller than that without the material. The stress releasing effect did not change with change of the longitudinal material property up to two weeks.
  
  
  CONCLUSIONS
  Within the limitations of our study, it was suggested that the stress releasing effect of the tissue conditioning material for the installed implant was not influenced by the thickness or change of longitudinal property.
authors.affiliation: Division for Interdisciplinary Dentistry, Osaka University Graduate School of Dentistry. k_yagi@dent.osaka-u.ac.jp
authors.forename: Kazutomo
authors.initials: K
authors.lastname: Yagi
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Maeda
authors.forename: Motofumi
authors.initials: M
authors.lastname: Sogo
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Tsugawa
authors.forename: Kazuo
authors.initials: K
authors.lastname: Ishii
mesh_terms: D015921:Dental Implants; D003764:Dental Materials; D003799:Dental Stress Analysis; D003778:Dentures; D003765:Models, Dental; D014016:Tissue Conditioning, Dental
chemical_list: D015921:Dental Implants; D003764:Dental Materials