Long-term Survival of Cerec Restorations: A 10-year Study

Abstract

SUMMARYThis clinical retrospective study assessed the longevity of CAD-CAM ceramic restorations (Cerec) inserted into the cavities of 95 patients in a private practice in Berlin, Germany.Three hundred and eight ceramic restorations were inserted into cavities in the posterior teeth of 95 patients between 1992 and 1994. One operator placed all restorations in a single sitting. Seventy-four patients, including 226 restorations, returned to the practice for a final examination at the end of 10 years. Reasons for non-attendance include relocation (15), death (2) and personal reasons (4). Again, all examinations were performed by a single examiner, however, not the same dentist who initially treated the patients. Out of the 226 restorations, 39 had been inserted in Class I cavities and 187 in Class II cavities (84 two-surfaces, 103 three or more surfaces). In the latter group, one cusp was replaced in 20 cases and two cusps in three cases. All the restorations were fabricated using Cerec 1 ( The results of the current study show that the survival rate of Cerec 1 restorations, as applied in this study, are comparable with the survival rates of cast gold restorations.

Marginal adaptation of fixed prosthodontics

“…The restorations in this study were mainly class I, class II, and one and two cusps restorations. Cerec1 was not able to fabricate crowns when this study began [3].…”

“…The low sintering shrinkage and porosity are given by the combination of these two processes that are responsible for the excellent adaptation and high strength of the material [3]. Some authors have pointed out the importance to evaluate the effect of the finish line on the marginal gap of allceramic crowns [4].…”

Influence of surrounding wall thickness on the fatigue resistance of molars restored with ceramic inlay

“…3,4 However, a recurrent question regarding inlay restorations relates to cavity design, especially regarding the occlusal isthmus extension, and to when the cusps should be overlapped. 5,6,7,8,9 In the literature, recommendations can be found indicating that when the limits of the inlay cavity preparations are closer than 1.5 mm to the functional cusp, or when there is a less than 2 mm remaining thickness, an onlay preparation should be included, with a 2 mm axial reduction.…”

Marginal adaptation of ceramic and composite inlays in minimally invasive mod cavities

“…As an indirect technique, CAD/CAM restorations such as the Cerec restoration process, come into consideration [24], showing a survival rate comparable to casted gold restorations [4,[25][26][27]. To date, special industrially fabricated ceramic blocks are used with the Cerec System.…”