title: Evaluation of proximal contact strength by postural changes.
abstract: BACKGROUND
  Proper proximal contact is important for maintaining and stabilizing the dental arch. However, the proximal contact strength (PCS) is not a constant value and can be affected by a variety of factors.
  
  
  OBJECTIVE
  This study examined the influences of postural changes on the posterior PCS.
  
  
  METHODS
  Twelve adults with a normal occlusion and had not undergone prosthetic treatment or proximal restoration were participated in this study. A metal strip was inserted into the proximal surface and removed at a constant velocity. The contact strength was measured in every contact point between canine to second molar in both arches. The PCSs were obtained initially in the upright position, secondly in the supine position and finally in the upright position again. All measurements were repeated after a 2 hour period. Statistical analysis was carried out using the Friedman test (P < .05).
  
  
  RESULTS
  Generally, a decrease in PCS occurred when the posture was changed from the initial upright to supine position, while it increased when the posture was changed from the supine to upright position. A significant change was observed in all areas except for between the canine-first premolar in the maxilla and between the first molarsecond molar in the mandible areas.
  
  
  CONCLUSIONS
  The posterior PCS, which dentists generally believe to be a static feature of occlusion, is affected significantly by posture.
authors.affiliation: Graduate Student, Department of Prosthodontics, School of Dentistry, Chosun University, Gwangju, Korea.
authors.forename: Hee-Sun
authors.initials: HS
authors.lastname: Kim
authors.forename: Hyun-Joon
authors.initials: HJ
authors.lastname: Na
authors.forename: Hee-Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Dong-Wan
authors.initials: DW
authors.lastname: Kang
authors.forename: Sang-Ho
authors.initials: SH
authors.lastname: Oh