title: An In Vitro Study of Condylar Displacement Caused by Interocclusal Records: Influence of Recording Material, Storage Time, and Recording Technique.
abstract: OBJECTIVE
  To evaluate the condylar displacement after mounting working casts using different interocclusal recording materials and to analyze the influence of the storage time and the recording technique on the displacement caused by the interocclusal record.
  
  
  METHODS
  Eight interocclusal records were made in each of the following groups: G1: Aluwax (aluminum wax), G2: Beauty Pink wax (hydrocarbon wax compound), G3: Futar D Fast, G4: Futar Scan (G3, G4: vinylpolysiloxane), G5: Ramitec (polyether), G6: LuxaBite (composite resin based on bis-acryl), G7: LuxaBite corrected with Aluwax. A condylar-positioning indicator measured the condylar displacement in the three planes after storage of the records for two periods of 1 and 48 hours. Two-way ANOVA was used to determine the influences of recording materials and each of the following factors: (1) region (record and non-record side), (2) storage time, and (3) recording technique. The statistical significance level was set at p < 0.05.
  
  
  RESULTS
  The vertical displacement caused by the interocclusal records in the record side after storage time of 1 hour ranged between 0.29 mm (Aluwax) and 0.14 mm (Futar Scan). The lateral displacement ranged between 0.13 mm (Aluwax) and 0.02 mm (Ramitec) while the anteroposterior displacement ranged between 0.15 mm (Ramitec) and 0.04 mm (Futar Scan). The corrected resin record showed generally lower displacement values than other materials tested (0.03, 0.02, and 0.07, respectively). On the non-record side, the values were lower than that on the record side. The condylar displacement increased after a storage time of 48 hours for all materials. Both factors, storage time and recording technique, had statistically significant influence on the condylar displacement.
  
  
  CONCLUSIONS
  Based on the results, the vertical displacement of the condyle caused by the interocclusal records was higher than the lateral or the anteroposterior displacement. Elastomers caused statistically significantly less condylar displacement than waxes or uncorrected composite resin. Corrected LuxaBite records with Aluwax showed significantly less condylar displacement than all other materials.
authors.affiliation: Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany.
authors.forename: Muhamad
authors.initials: M
authors.lastname: Ghazal
authors.affiliation: Institute of Medical Informatics and Statistics, Christian-Albrechts University at Kiel, Kiel, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Hedderich
authors.affiliation: Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Kern
mesh_terms: D003725:Dental Articulators / Q000009:adverse effects; D003735:Dental Casting Technique; D006801:Humans; D066298:In Vitro Techniques; D007574:Jaw Relation Record / Q000379:methods; D008335:Mandibular Condyle / Q000473:pathology*; D013997:Time Factors
keywords: Wax; articulator; composite resins; maxillomandibular relationships; polyether; vinylpolysiloxane