Clinical Evaluation of In-Ceram Crowns

Abstract

In recent years, the demand for esthetics in restorative dentistry has been increasing. While many allceramic systems have been developed over the years, few long-term clinical data for these systems are available. In this study, we conducted a retrospective clinical evaluation of In-Ceram crowns placed at the Tsurumi University Dental Hospital, at 54 to 64 months after the crown placement. Of the total of 70 In-Ceram crowns fitted, 57 could be followed up. Five crowns were missing, of which two were removed due to fracture problems. Thus, the cumulative survival rate of the In-Ceram crowns was 91.2%, which indicate the clinical acceptability of the In-Ceram crowns. We believe that these results would be useful in clinical practice. AbstractPurpose: The purpose of this study was to evaluate InCeram crowns after 5 years' use in vivo. Methods:A total of 70 In-Ceram crowns were placed at the Tsurumi University Dental Hospital, Department of Prosthetic Dentistry, during the period from May 1995 to April 1996. A follow-up study was conducted 5 years later, from December 2000 to January 2001. We first examined whether the In-Ceram crowns were still functioning. In cases where the abutment tooth was missing, we asked the patients when and how it was lost. In addition, each crown was evaluated by two examiners according to the modified USPHS (US Public Health Service) criteria, which include marginal integrity, shade compatibility, secondary caries, and wear of the occlusal surface. Then, the examiners calculated the period of functioning of each crown from the date of placement to the present (or the date of failure). The survival curve of the In-Ceram crowns was analyzed using the nonparametric Kaplan -Meier method.Results: A total of 57 of 70 In-Ceram crowns were examined after a mean of 60 months following their placement, and the remaining 13 were lost to followup. Fifty-two of the 57 In-Ceram crowns were found to be still functional, while the remaining five crowns were missing. Two of the five missing crowns had been removed due to fracture after 33 and 53 months, respectively. Another of the missing crowns had been removed because of periodontal disease after 29 months. The remaining two of the five missing crowns had been removed because of dislodgement of the dowel and core after 39 months in one case, and because a fixed partial denture including this tooth was fabricated after 55 months in the other case. According to the five categories of the modified USPHS (US Public Health Service) criteria, most crowns were assessed as Alpha, while both shade match and wear were rated as Charlie in 3.8% of the crowns. The cumulative survival rate was 91.2% (standard error: 0.038). Conclusion:Out of the 70 crowns placed in 1995/ 1996, 57 In-Ceram crowns were available for followup at the end of an average of 5 years after their placement, and the survival rate of the In-Ceram crowns was 91.2%. Within the framework of the limitations of this clinical evaluation, the In-Ceram crowns were found to be clinically acceptable, ...

Clinical evaluation of Procera AllCeram crowns in Japanese patients: results after 5 years

“…Until now, the only clinical studies dealing with the longevity of Procera AllCeram crowns have been conducted in Europe (6)(7)(8)(9). In contrast to other studies in Japan involving all-ceramic crown systems, Kokubo et al (10) evaluating 70 In-Ceram crowns showed that their survival rate was 91AE2% after a follow-up exceeding 5 years. In addition, they reported that the cumulative survival rate of 101 In-Ceram crowns with copings fabricated using a computer-aided design ⁄ computer-aided manufacturing system was 93AE9% after 39 months of function (11).…”

Five-year clinical evaluation of In-Ceram crowns fabricated using GN-I (CAD/CAM) system

“…The potential for fractures is also present under laboratory conditions. In this report, earlier fracture, which may be related to processing defects, was not observed, and later fractures may be related to fatigue effects, which means that the copings fabricated using the GN‐I system may have fewer processing defects, whereas conventional In‐Ceram crowns had early fractures (11). Two canine crown fractures could have been caused by a fatigue effect applied by guidance during articulation.…”

“…All-ceramic crowns are now popular options to restore decayed teeth for both anterior and posterior regions. One of the major systems, the VITA In-Ceram System*, was first introduced in 1989 (1) and has been successfully used as an alternative to conventional porcelainfused-to-metal crowns (2)(3)(4)(5)(6)(7)(8)(9)(10)(11).…”

Clinical Evaluation of In-Ceram Crowns Fabricated Using GN-I System: Preliminary Results after 24-39 Months of Use

“…This means that the copings fabricated using the GN-I system may have fewer processing defects than conventional In-Ceram crowns that had early fractures. 11 Kelly 33 also reported that the structural durability of all-ceramic crowns is affected by the type of ceramic materials, luting system, and occlusal load.…”

“…The In-Ceram system was first introduced in 1990 1 and has been used successfully as an alternative to conventional porcelain-fused-to-metal crowns. [2][3][4][5][6][7][8][9][10][11] Originally, a slip-cast aluminum oxide ceramic was used in In-Ceram crowns. Recently, many computer-aided design/computer-aided manufacturing (CAD/CAM) systems have been developed for use in dentistry.…”