title: Evaluation of hypersensitivity after the placement of metal-ceramic crowns cemented with two luting agents: Long-term results of a prospective clinical study.
abstract: BACKGROUND
  Different luting materials are available for the cementation of fixed dental prostheses. Postcementation hypersensitivity is an occasional complication in the definitive delivery. How the choice of luting agent affects long-term postcementation sensitivity is unknown.
  
  
  OBJECTIVE
  The purpose of this prospective, randomized, controlled, split-mouth clinical trial was to compare the hypersensitivity of 2 cementation methods for metal-ceramic crowns. The primary endpoint was the evaluation of differences in hypersensitivity between the study groups over a study period of 5 years.
  
  
  METHODS
  The study investigated 20 participants with 40 metal-ceramic crowns cemented with either zinc phosphate cement or a self-adhesive resin cement, each in nonantagonistic contralateral quadrants (observation period of 5 years). The data regarding postcementation hypersensitivity included continuous patient-related outcome variables assessed using a visual analog scale (sign test; primary endpoint, level of significance α/3=.0167; secondary endpoint, level of significance, α=.05) and categorical variables represented by yes/no replies (absolute and relative frequencies). The sensitivity of teeth was controlled in relation to mastication, air streams, and hot and cold temperatures.
  
  
  RESULTS
  The observation period was 5 years, with a dropout rate of 12.5% in the last 2 years. The results indicated no significant differences between the cement groups for patient- and clinical-related outcomes at any of the observed time points.
  
  
  CONCLUSIONS
  As no differences were found between the 2 different cementation modes with respect to developing hypersensitivity after 5 years, the choice of a luting agent remains an individual practitioner decision.
authors.affiliation: Doctor and Research Assistant, Department of Prosthodontics and Dental Technology, Faculty of Health, Witten/Herdecke University, Witten, Germany.
authors.forename: Carla
authors.initials: C
authors.lastname: Kozmacs
authors.affiliation: Research Assistant, Department of Medical Informatics, Biometry and Epidemiology (IMBE) Faculty of Health, Witten/Herdecke University, Witten, Germany.
authors.forename: Katharina
authors.initials: K
authors.lastname: Schaper
authors.affiliation: Professor and Chairman, Department of Prosthodontics, School of Dentistry, Johann Wolfgang Goethe University of Frankfurt/Main, Germany.
authors.forename: Hans-Christoph
authors.initials: HC
authors.lastname: Lauer
authors.affiliation: Professor and Chairman, Department of Prosthodontics and Dental Technology, Faculty of Health, Witten/Herdecke University, Witten, Germany. Electronic address: andree.piwowarczyk@uni-wh.de.
authors.forename: Andree
authors.initials: A
authors.lastname: Piwowarczyk
mesh_terms: D002484:Cementation / Q000379:methods*; D003442:Crowns; D005500:Follow-Up Studies; D006801:Humans; D006967:Hypersensitivity / Q000209:etiology*; D019279:Resin Cements / Q000009:adverse effects*; D015036:Zinc Phosphate Cement / Q000009:adverse effects*
chemical_list: D019279:Resin Cements; C095998:Adhesive cement; D015036:Zinc Phosphate Cement