0312 Clinical long-term behavior of Zirconia-based bridges (LAVA): Five years results
F.P. NOTHDURFT1, P.R. ROUNTREE2, and P.R. POSPIECH1, 1Saarland University, Homburg/Saar, Germany, 2Private Practice, Munich, Germany

CAD/CAM-processed zirconia ceramics can be used for the fabrication of all-ceramic bridges. The strength of the material allows the conventional cementation, which simplifies the daily clinical life. Some in-vitro studies on three- and four-unit posterior bridges revealed that the strength is high enough to run controlled clinical studies. OBJECTIVES: The purpose of this prospective study was to observe the clinical performance of zirconia posterior bridges for the replacement of molars. MATERIAL AND METHODS: Since October 2000 a total of 31 bridges were placed. All abutment teeth were prepared for full crowns with a maximum 1.2 mm chamfer. Impressions were made with a polyether material. The axial wall-thicknesses of the zirconia-cores were constant 0.6 mm, the connector area was designed with a cross-sectional plane of minimum 9 mm2. All restorations were cemented conventionally with the glass-ionomer cement Ketac Cem. Recalls took place in March 2006 after an observation time of five years. 15 bridges could be evaluated clinically at that time. Judgements were made on the fit of the bridges on the abutment teeth, discoloration of the marginal gingiva, the quality of the surface, failures and allergenic reactions. Furthermore the survival of 6 bridges could be proved by questioning the patients by phone. 1 bridge was lost for endodontic reasons. One patient wearing 2 bridges died. 7 patients moved to unknown adresses. RESULTS: No changes in fit or secondary caries were observed. No total failures regarding the restoration's integrity happened. Slight chipping of the veneering material took place in single cases, but there was no need for retreatment. No allergenic reactions and negative influences on the marginal gingiva could be observed. CONCLUSION: After five years of clinical service one can conclude a high performance of zirconia based posterior bridges. This study was supported by 3M Espe, Seefeld, Germany.

Seq #37 - A. Dental Materials Poster Session II
2:00 PM-5:00 PM, Thursday, 14 September 2006 Trinity College Dublin Hamilton Building Lower Ground I

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