Zirconia‐Based Screw‐Retained Prostheses Supported by Implants: A Retrospective Study on Technical Complications and Failures

Worni, Andreas; Kolgeci, Lumni; Rentsch-Kollar, Andrea; Katsoulis, Joannis; Mericske‐Stern, Regina

doi:10.1111/cid.12214

Cited by 45 publications

(42 citation statements)

References 35 publications

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“…Indeed, as yet, an assessment of the risk of complete failure has not been reported for implant-supported restorations [32,33]. A retrospective study of zirconia-based screw-retained prostheses supported by implants and including 65 SCs and 91 FDPs was recently made available [34]. The cumulative survival rate was 90.5 % after 5 years.…”

Section: Discussion Survival Estimatesmentioning

confidence: 99%

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

2015

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Objectives The aims of this study were set as follows:1. To provide verifiable criteria to categorize the ceramic fractures into non-critical (i.e., amenable to polishing) or critical (i.e., in need of replacement) 2. To establish the corresponding survival rates for alumina and zirconia restorations 3. To establish the mechanism of fracture using fractography Materials and methods Fifty-eight patients restored with 115 alumina-/zirconia-based crowns and 26 zirconia-based fixed dental prostheses (FDPs) were included. Ceramic fractures were classified into four types and further subclassified into "critical" or "non-critical." Kaplan-Meier survival estimates were calculated for "critical fractures only" and "all fractures." Intra-oral replicas were taken for fractographic analyses. Results Kaplan-Meier survival estimates for "critical fractures only" and "all fractures" were respectively: Alumina single crowns: 90.9 and 68.3 % after 9.5 years (mean 5.71 ± 2.6 years). Zirconia single crowns: 89.4 and 80.9 % after 6.3 years (mean 3.88±1.2 years). Zirconia FDPs: 68.6 % (critical fractures) and 24.6 % (all fractures) after 7.2 and 4.6 years respectively (FDP mean observation time 3.02±1.4 years). No core/framework fractures were detected. Conclusions Survival estimates varied significantly depending on whether "all" fractures were considered as failures or only those deemed as "critical". For all restorations, fractographic analyses of failed veneering ceramics systematically demonstrated heavy occlusal wear at the failure origin. Therefore, the relief of local contact pressures on unsupported ceramic is recommended. Occlusal contacts on mesial or distal ridges should systematically be eliminated. Clinical relevance A classification standard for ceramic fractures into four categories with subtypes "critical" and "noncritical" provides a differentiated view of the survival of ceramic restorations.

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Section: Discussion Survival Estimatesmentioning

confidence: 99%

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

2015

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“…Nevertheless, in the clinical reality, a framework is often screwed directly to the implants, avoiding the use of a screw‐retained abutment . This implant‐level (IL) setup is often used in cases due to limited vertical spaces and to reduce costs .…”

Section: Introductionmentioning

confidence: 99%

Implant vs abutment level connection in implant supported screw‐retained fixed partial dentures with cobalt‐chrome framework: 1‐year interim results of a randomized clinical study

Toia

Stocchero

Becktor

et al. 2019

Clin Implant Dent Rel Res

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Background Screw‐retained fixed partial dentures (FPD) have shown a lower incidence of biologic complications and an easier retrievability compared with cemented FPD. Purpose To compare the marginal bone loss at conical connection implant restored with a screw retained cobalt‐chrome FPD in an implant‐level (IL) or an abutment‐level (AL) setup. Materials and Methods Patients with at least two adjacent missing teeth were randomly allocated to be restored with IL or AL FPD. Periapical radiographs and clinical examination were taken at implant placement, prosthetic connection, 6 and 12 months to evaluate marginal bone loss (MBL), and soft tissue conditions. Complications were used to calculate prognostic indexes. Results Fifty patients were treated with 50 FPD supported by 119 implants. The difference of MBL between the IL and AL groups was statistically significant (P = 0.003). At 1 year, MBL was 0.086 ± 0.313 mm and 0.005 ± 0.222 mm in the IL and AL groups, respectively. The presence of BoP increased with time in IL, whereas it decreased in AL group (P < 0.001). A minor complication was encounted in one FPD. Conclusions A low grade of MBL was present after 1 year. IL showed greater amount of MBL and soft tissue inflammation indexes than AL. In FPD, AL may be a safer procedure than IL setup in order to preserve a healthy periimplant tissue.

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“…After milling, Y-TZP frameworks have to be veneered with feldspathic or glass ceramics by means of layering, the press or the digital veneering technique 2. However, clinical studies have reported failures such as chipping (cohesive failure of porcelain) and delamination (adhesive failure between the ceramic and framework 3456. Preis et al2 reported that different framework designs, veneer application techniques, and firing regimes influence the number and dimension of failures in zirconia-based all-ceramic crowns.…”

Section: Introductionmentioning

confidence: 99%

Shear bond strength of indirect composite material to monolithic zirconia

et al. 2016

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PURPOSEThis study aimed to evaluate the effect of surface treatments on bond strength of indirect composite material (Tescera Indirect Composite System) to monolithic zirconia (inCoris TZI).MATERIALS AND METHODSPartially stabilized monolithic zirconia blocks were cut into with 2.0 mm thickness. Sintered zirconia specimens were divided into different surface treatment groups: no treatment (control), sandblasting, glaze layer & hydrofluoric acid application, and sandblasting + glaze layer & hydrofluoric acid application. The indirect composite material was applied to the surface of the monolithic zirconia specimens. Shear bond strength value of each specimen was evaluated after thermocycling. The fractured surface of each specimen was examined with a stereomicroscope and a scanning electron microscope to assess the failure types. The data were analyzed using one-way analysis of variance (ANOVA) and Tukey LSD tests (α=.05).RESULTSBond strength was significantly lower in untreated specimens than in sandblasted specimens (P<.05). No difference between the glaze layer and hydrofluoric acid application treated groups were observed. However, bond strength for these groups were significantly higher as compared with the other two groups (P<.05).CONCLUSIONCombined use of glaze layer & hydrofluoric acid application and silanization are reliable for strong and durable bonding between indirect composite material and monolithic zirconia.

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Zirconia‐Based Screw‐Retained Prostheses Supported by Implants: A Retrospective Study on Technical Complications and Failures

Abstract: This study shows that zirconia-based implant-supported fixed prostheses exhibit satisfactory treatment outcomes and that screw-retention directly at the implant level is feasible.

Cited by 45 publications

References 35 publications

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

Implant vs abutment level connection in implant supported screw‐retained fixed partial dentures with cobalt‐chrome framework: 1‐year interim results of a randomized clinical study

Shear bond strength of indirect composite material to monolithic zirconia

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