title: In vitro and in vivo evaluation of a new Opaque system for metal ceramic restorations.
abstract: This study made an in vitro comparison of the shear strength in a corrosive solution, the scanning electron microscopy of the processing steps, and the x-ray powder diffraction analyses of a newly developed opaque system (Biopaque) with a traditional opaque-system (Opaque P). Clinically, two traditional opaque systems (Opaque P and Vita-VMK-Paint-On 88 opaque) were compared to Biopaque over a 4-year period. A total of 218 metal ceramic units were placed for 29 patients. One hundred ten were veneered with Biopaque, 50 with Opaque P, and 58 with Vita-VMK-Paint-On 88. The technical failure rate of the metal ceramic restorations was 9.6%, and the biological failure rate 5.5%. There was no significant difference of the shear strength in a corrosive solution between Biopaque and the traditional opaque system (Opaque). The x-ray powder diffraction analyses revealed that only the base paste of Biopaque was a newly developed material. In this study, the new opaque system (Biopaque) showed the same in vitro and in vivo results as the other conventional opaque systems. However, at least 5 years of clinical evaluation are necessary before this new opaque system can be completely recommended.
authors.affiliation: Department of Prosthodontics, School of Dentistry, Albert-Ludwigs-University, Germany.
authors.forename: M B
authors.initials: MB
authors.lastname: Hurzeler
authors.forename: R
authors.initials: R
authors.lastname: Kohal
authors.forename: C
authors.initials: C
authors.lastname: Fischer
authors.forename: J
authors.initials: J
authors.lastname: Fischer
authors.forename: J R
authors.initials: JR
authors.lastname: Strub
mesh_terms: D000328:Adult; D003343:Corrosion; D003442:Crowns; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry; D003830:Denture, Partial, Fixed; D005069:Evaluation Studies as Topic; D005260:Female; D005899:Glass Ionomer Cements; D006047:Gold Alloys; D006801:Humans; D008297:Male; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D010165:Palladium; D011475:Prosthesis Failure; D013499:Surface Properties; D014961:X-Ray Diffraction; D015036:Zinc Phosphate Cement
chemical_list: D005899:Glass Ionomer Cements; D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain; D010165:Palladium; D015036:Zinc Phosphate Cement