title: Metal-ceramic crowns cemented with two luting agents: short-term results of a prospective clinical study.
abstract: A prospective, randomized, controlled, split-mouth trial was performed to evaluate the cementation modes for metal-ceramic crowns. A total of 40 fully veneered metal-ceramic crowns were delivered in the posterior jaw segments of 20 patients using either a self-adhesive resin cement (RelyX Unicem Aplicap, 3M ESPE; n = 20) or a zinc oxide phosphate cement (Hoffmann's Cement, Hoffmann; n = 20). Thirteen parameters related to the abutment teeth and their periodontal status were evaluated. A visual analog scale was used to assess the sensitivity of the abutment teeth by patient-based outcomes. Data were statistically analyzed by a single-classification ANOVA (α = 0.05) and logistic regression analysis. The results presented were obtained after a mean observation period of 1.8 years. The dropout rate was 0%. None of the abutment teeth exhibited secondary caries at the restoration margins. No significant differences were demonstrated between the luting agents based on visual analog scale (p > 0.05), hypersensitivity (OR = 1.31), abutment mobility (p > 0.05), or probing depths (p > 0.05). Based on the sulcus fluid flow rates, a significantly greater mean difference was obtained with zinc oxide phosphate cement than with self-adhesive resin cement (9.2 units; p = 0.0006). Significant differences between the baseline examination and the follow-up examinations for sulcus bleeding index (p = 0.0013) and plaque index (p < 0.0001) were observed regardless of the luting agent used. The two cement types showed scarcely any differences between the parameters investigated. The outcomes of cementing fully veneered metal-ceramic crowns were equally good with self-adhesive resin cement as with the clinically proven zinc oxide phosphate cement.
authors.affiliation: Department of Prosthodontics, School of Dentistry, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany. piwowarczyk@gmx.de
authors.forename: Andree
authors.initials: A
authors.lastname: Piwowarczyk
authors.forename: Karina
authors.initials: K
authors.lastname: Schick
authors.forename: Hans-Christoph
authors.initials: HC
authors.lastname: Lauer
mesh_terms: D000704:Analysis of Variance; D002484:Cementation / Q000379:methods*; D003442:Crowns; D000044:Dental Abutments; D003807:Dentin Sensitivity; D005883:Gingival Crevicular Fluid / Q000502:physiology; D006801:Humans; D057446:Hydrodynamics; D016015:Logistic Models; D016876:Metal Ceramic Alloys; D008875:Middle Aged; D011446:Prospective Studies; D019279:Resin Cements; D016037:Single-Blind Method; D015036:Zinc Phosphate Cement
chemical_list: D016876:Metal Ceramic Alloys; D019279:Resin Cements; D015036:Zinc Phosphate Cement