title: Influence of different luting agents on the marginal discrepancy of Procera Allceram alumina crown copings--an experimental study.
abstract: Two maxillary first molars and two central incisor typhodont teeth were prepared with 0.8 mm chamfer, 2.0 mm occlusal reduction, and 6 degree taper. The prepared teeth were duplicated 9 times to obtain 36 die stone models and divided into three groups (n = 12). Luting agents tested were zinc phosphate, glass ionomer and resin cement. Procera AllCeram 0.6 mm coping was fixed with a calibrated finger force of 50 N. The absolute marginal discrepancy was measured using the scanning electron microscope on four axial walls with 4 measurements on each wall to obtain a total of 16 readings for one tooth. Mann Whitney U test was applied to find significant differences between luting cements and Kruskal Wallis tests among groups. Results The absolute marginal discrepancies of cements were in reducing order zinc phosphate (AZ) 53 microm; resin (AR) 44.5 microm, glass ionomer (AG) 29 microm. There was a significant difference among luting cements AG V/s AZ (p = 0.001) and AR V/s AG (p = 0.003), except AR V/s AZ (p = 0.213). All axial surfaces except mesial showed a significant difference. Conclusion The study concluded that different luting media have a definite effect over the final fit of AllCeram coping. Absolute marginal discrepancy was within the accepted level of 100 microm. Distal axial surface demonstrated a wider gap among all the luting agents.
authors.affiliation: Department of Prosthodontics, Charles University in Prague, Faculty of Medicine, University Hospital in Hradec Králové, Czech Republic. shreeharsha_70@yahoo.co.in
authors.forename: Shriharsha
authors.initials: S
authors.lastname: Pilathadka
authors.forename: Radovan
authors.initials: R
authors.lastname: Slezák
authors.forename: Dagmar
authors.initials: D
authors.lastname: Vahaloá
authors.forename: Marina George
authors.initials: MG
authors.lastname: Kudiyirickal
authors.forename: Sujith
authors.initials: S
authors.lastname: Sukumar
mesh_terms: D000537:Aluminum Oxide; D003442:Crowns; D003738:Dental Cements; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain; D005899:Glass Ionomer Cements; D006801:Humans; D066298:In Vitro Techniques; D016876:Metal Ceramic Alloys; D019279:Resin Cements; D014025:Titanium; D015036:Zinc Phosphate Cement
chemical_list: C105314:AllCeram; D003738:Dental Cements; D005899:Glass Ionomer Cements; D016876:Metal Ceramic Alloys; C077451:Procera; D019279:Resin Cements; D003776:Dental Porcelain; D015036:Zinc Phosphate Cement; D014025:Titanium; D000537:Aluminum Oxide