title: [Measurement of periapical pressure created by occlusal loading].
abstract: The aim of this study was to develop an in vitro model in which the pressure in the periapical tissues can be measured during loading. Extracted human maxillary central incisors were embedded into resin blocks that had physical characteristics similar to bone and periodontal ligament. Each tooth was loaded with 20, 40, 50, 60, 75, 85, 100, 200, 300 and 450 N vertical forces from the incisal edge of the crown; this procedure was carried out three consecutive times. A minute resistor embedded in the periapical space was used to detect apical pressure changes during occlusal loading. The ratio of apical pressure changes (delta P) to the loading force changes (delta F) was calculated. The periapical pressure detected was in direct proportion to the loading force. The mean value of delta P/delta F was 5.994 kPa/N (SD = 2.04). Direct proportionality was found between the coronal loading and the apical hydrostatic pressure. The (delta P)/(delta F) ratio determined in this study makes it easier to estimate the apical hydrostatic pressure values during occlusal loading of single rooted teeth. In this study the apical pressure generated under occlusal loading was of the same magnitude as that estimated with the finite element method.
authors.affiliation: Semmelweis Egyetem, Fogpótlástani Klinika, Budapest.
authors.forename: Nagy Csaba
authors.initials: NC
authors.lastname: Dobó
authors.forename: Pál
authors.initials: P
authors.lastname: Fejérdy
authors.forename: János
authors.initials: J
authors.lastname: Angyal
authors.forename: Lajos
authors.initials: L
authors.lastname: Harasztosi
authors.forename: Lajos
authors.initials: L
authors.lastname: Daróczi
authors.forename: Dezsó
authors.initials: D
authors.lastname: Beke
authors.forename: Paul R
authors.initials: PR
authors.lastname: Wesselink
mesh_terms: D001732:Bite Force; D003766:Dental Occlusion; D003799:Dental Stress Analysis / Q000379:methods; D006801:Humans; D066298:In Vitro Techniques; D016382:Orthodontic Appliance Design; D010486:Periapical Tissue / Q000502:physiology; D011312:Pressure; D019228:Tooth Crown