A 1-year randomised controlled trial comparing zirconia versus metal-ceramic implant supported single-tooth restorations (original) (raw)
The International Journal of Prosthodontics
To assess and compare the clinical outcomes of three different types of all-ceramic posterior monolithic tooth-supported crowns. Materials and Methods: A total of 71 patients received 90 all-ceramic crowns randomized to be either high-translucency zirconia (ZC), high-translucency zirconia with a partial buccal veneer (ZC-V), or lithium disilicate glassceramic (LDS). All treatments were performed by four general dentists. Choice of material was blinded. Baseline and subsequent annual evaluation were based on modified California Dental Association (CDA) criteria. A questionnaire was used to include patient-reported outcomes and to compare them to the crown quality rating performed by dentists. Results: A total of 66 patients with 84 crowns were examined after 3 years. The survival rate was 98.8%. No crowns fractured during the observation period. One ZC-V crown failed due to loss of retention, and three complications were noted: loss of retention occurred in one ZC crown, and two ZC crowns needed to be endodontically treated. There was no significant difference between the different crowns regarding marginal integrity, surface, or anatomical form. Both patients and examining dentists rated the crowns favorably regarding esthetics, patients more than dentists. Conclusion: Posterior lithium disilicate glass-ceramic crowns and translucent zirconia crowns with or without a partial buccal veneer show excellent and promising clinical outcomes from a short-term perspective. Patients and dentists rate the restorations favorably concerning esthetics and function.
The International journal of prosthodontics, 2004
PURPOSE This prospective clinical study evaluated an experimental implant abutment made of densely sintered zirconia with respect to peri-implant hard and soft tissue reaction as well as fracture resistance over time. MATERIALS AND METHODS Twenty-seven consecutively treated patients with 54 single-tooth implants were included. Zirconia abutment ingots were individually shaped and set on the implants with gold screws. All-ceramic (Empress I) crowns were cemented using a composite cement. At the 1- and 4-year examinations, reconstructions were evaluated for technical problems (fracture of abutment or crown, loosening of abutment screw). Modified Plaque and simplified Gingival Indices were recorded at implants and neighboring teeth, and peri-implant bone levels were radiographically determined. RESULTS All but 1 of the 27 patients with 53 restorations could be evaluated at 1 year, and 36 restorations in 18 patients were evaluated 4 years after abutment and crown insertion. The median o...
Practice-based clinical evaluation of metal-ceramic and zirconia molar crowns: 3-year results
Journal of Oral Rehabilitation, 2013
This practice-based study evaluates the clinical performance of conventionally luted metalceramic and zirconia molar crowns fabricated with pronounced anatomical core design and a prolonged cooling period of the veneering porcelain. Fifty-three patients were treated from 07/2008 until 07/2009 with either metal-ceramic crowns (MCC) (high-noble alloy + low-fusing porcelain) or zirconia crowns (Cercon System, DeguDent, Germany). Forty-nine patients (30 women/19 men) with 100 restorations (metalceramic: 48/zirconia: 52, mean observational period: 36Á5 AE 6 months) participated in a clinical follow-up examination and were included in the study. Time-dependent survival (in situ criteria), success (event-free restorations) and chipping rates (defects of the veneering ceramics) were calculated according to the Kaplan-Meier method and analysed in relation to the crown fabrication technique, using a Cox regression model (P < 0Á05). Three complete failures (metal-ceramic: 1, zirconia: 2) were recorded (survival rate after 3 years: metalceramic: 97Á6%, zirconia: 95Á2%). Of the metalceramic restorations, 90Á9% remained event-free (two ceramic fractures, one endodontic treatment), whereas the success rate for the zirconia was 86Á8% (two ceramic fractures, one endodontic treatment, one secondary caries). No significant differences in survival (P = 0Á53), success (P = 0Á49) and ceramic fracture rates (P = 0Á57) were detected. The combination of a pronounced anatomical core design and a modified firing of the veneering porcelain for the fabrication of zirconia molar crowns resulted in a 3-year survival, success and chipping rate comparable to MCC.
Efficacy of zirconia crowns: A 3 year retrospective and clinical follow up study
Journal of Advanced Medical and Dental Sciences Research, 2016
Background: All-ceramic crowns have become increasingly used also in the posterior regions, but there are only few studies documenting the clinical outcome of these restorations. The aim was therefore to present the 3-year outcome of zirconia single crowns. Materials & Methods: All patients treated with porcelain-veneered zirconia single crowns in prosthodontic department. The patient records were scrutinized for data on the restorations and the supporting teeth. Information was available for 152 patients and 260crowns. At the 3-year recall appointments, a sample of 22 patients with 40 crowns was clinically examined and interviewed regarding patient satisfaction. Results: Most crowns (78%) were placed on premolars and molars. The clinical outcome of crowns was favourable. No zirconia core fractured and no caries was observed on the abutment teeth. Patient satisfaction with the zirconia crowns was in general high. Conclusions: The porcelain-veneered zirconia crowns showed good clinical results, were well accepted by the patients, and only few complications were reported over the 3-year follow-up period. Zirconia crowns can be alternative for metal-porcelein crowns in posterior teeth.
International Journal of Prosthodontics, 2015
The purpose of this retrospective study was to evaluate the 5-year clinical performance and failure rate of single-or multiple-unit zirconia-based crowns. Materials and Methods: A total of 148 patients (39 men and 109 women, mean age: 46.9 ± 10.6 years) treated in university and private practices with 618 single-or multiple-unit zirconia-based (Lava) crowns made on natural teeth from January 2007 to December 2008 were included. Two hundred fifty-nine anterior and 359 posterior crowns were examined. A core and/or veneer fracture that required replacement of the restoration was considered to be a failure. The cumulative survival rate (CSR) was described with Kaplan-Meier survival functions. The crowns replaced for other reasons were deemed lost to follow-up, and esthetic, functional, and biologic complications were rated. Results: At the 5-year follow-up, no zirconia core fractures were observed. Twelve veneer fractures that required crown replacement were detected. The CSR was 98.1%. There was a statistically significant difference between survival of the anterior and posterior restorations (P < .001). In total, 116 crowns experienced biologic and technical complications. The most common complications were smooth veneer fracture (4, 0.6%), loss of retention (7, 1%), staining because of smoking (24, 4%), and gingival recession (48, 8%). Conclusions: According to the 5-year CSR (98.1%) observed in this study, zirconia-based single or multiple crowns may be considered an acceptable treatment modality for the replacement of anterior and posterior teeth. Results from the current study should be supported by additional randomized clinical trials.
Al-Azhar Dental Journal for Girls
Statement of problem. Treatment of tooth loss in the anterior maxilla can involve difficult functional, esthetic, and psychological problems, especially in young patients with otherwise good dentition. Purpose. The purpose of this study was to provide a comparative evaluation of two different implant system (Biohorizons and Dentium) with zirconia abutment in cemented single-tooth restorations. Material and methods. This prospective study of 45 single-tooth replacements with 22 Biohorizons and 23 Dentium dental implants was performed in 30 patients. The patients were selected from the outpatients' clinic, Faculty of Dental Medicine, Al-Azhar University during the period October 2010 to October 2013. The custom zirconia abutments were fabricated. The restoration was an all ceramic crown for cementation with a framework in zirconia. The first clinical and radiographic follow up was performed one week after crown placement for all patients (baseline examination) then at four, eight and twelve months after crown placement, all patients were recalled and participated in the annual examination. Results. The clinical parameters (plaque and peri-implant gingival indexes) measured at the baseline and 1-year follow-up examination showed non significant differences in Biohorizons and Dentium and gave a satisfactory results. There is a significant difference in probing depth where the Biohorizons gave better result. The bone loss in Biohorizons was lesser than that in Dentium. The mean marginal bone loss was slightly higher (non significant) in the maxilla for both implant systems. During the 1-year follow up period, the survival rate was 100% in Biohorizons implant system and 95.6% in Dentium implants. The titanium screws that attached the abutment to implant were loosened within a few months of insertion of the permanent crown in two cases of Dentium implant. Subjectively all patients were satisfied with their single-tooth restorations supported by both dental implants. Conclusion. Within the limitation of the present study, favorable results obtained with the application of the Biohorizons implant system that supported cemented single-tooth crowns with custom zirconia abutment especially in the anterior region of the maxilla. Further studies are necessary to evaluate the long-term success.
Clinical outcome of single porcelain-fused-to-zirconium dioxide crowns: A systematic review
Statement of problem. The increasing demand by patients for esthetic and metal-free restorations has driven the development of ceramic restorations with good esthetic and mechanical stability. Recent clinical studies have investigated the use of zirconium dioxide as a core material for complete crowns and computer-aided-design/computer-aided-manufacturing fabricated restorations.