Feldspathic and Lithium Disilicate Onlays with a 2-Year Follow-Up: Split-Mouth Randomized Clinical Trial

Abstract

The present study was a prospective, controlled, randomized, clinical short-term trial aiming to evaluate the clinical performance of adhesively luted, lithium disilicate and feldspathic glass-ceramics onlays over a period up to 2 years. A total of 11 patients (7 female, 4 male; age range: 18-60 years, mean age: 39 years) were selected for this study. Each patient received a maximum of two restorations per group in a split-mouth-design. LD: Eleven onlays, performed with lithium disilicate-based ceramic (IPS e.max CAD, Ivoclar Vivadent, Schaan, Liechtenstein), and FP: Eleven onlays, performed with feldspathic ceramic (Vita Mark II, Vita Zanhfabrik, Bad Säckingen). Recalls were performed at 2 weeks (baseline = R1), 1 year (R2) and 2 years (R3) after the cementation by three calibrated blinded independent investigators using mirrors, magnifying eyeglasses, probes and bitewing radiographs. The postoperative sensitivity, secondary caries, marginal integrity, marginal discoloration, color match, surface roughness, tooth integrity, and restoration integrity were evaluated. The Friedman test was used to determine if there was a statistically significant difference in time-to-time comparison of the parameters in the ceramics restorations. A total of 95.4% of the restorations were clinically acceptable at the 2-year recall, without a difference for any evaluation parameter for both ceramic materials. Based on the 2-year data, the CAD-CAM onlays manufactured with feldspathic and lithium-disilicate based ceramics showed similar clinical performance.

Clinical performance comparison between lithium disilicate and hybrid resin nano-ceramic CAD/CAM onlay restorations: a two-year randomized clinical split-mouth study

“…The null hypothesis of the current study cannot be rejected, as no significant difference was observed in the clinical performance of restorations made from lithium disilicate (IPS e.max CAD) or RNC (Voco Grandio) after a 2-year clinical follow-up. A thorough review of the published literature revealed several clinical studies that assessed the clinical performance of glass–ceramics [ 11 , 14 , 28 – 35 , 40 – 42 ]. However, there is a scarcity of data evaluating the clinical performance of RNC restorations, and few studies have directly compared different materials within the same study [ 5 , 12 , 13 , 36 ].…”

“…The modified USPHS criteria have been widely regarded as reliable and standard methods for evaluating the clinical performance of ceramic restorations in various published literature [ 12 , 35 ]. Moreover, a previous clinical study over ten years assessed the clinical performance of 200 feldspathic ceramic inlay and onlay restorations using the modified USPHS criteria [ 66 ].…”

“…These blocks exhibit hardness and modulus of elasticity (18.28 GPa), similar to those of natural tooth structures [ 17 , 27 ]. After an extensive search for published evidence, numerous studies evaluating the clinical performance of glass–ceramic restorations have been conducted [ 11 , 13 , 28 – 35 ]. However, limited information exists regarding the clinical performance of RNC restorations [ 12 , 13 , 36 ].…”

Two‑year clinical performance of indirect restorations fabricated from CAD/CAM nano hybrid composite versus lithium disilicate in mutilated vital teeth. A randomized controlled trial

“…[ 32 , 33 ]. However, it is worth noting that several published studies have suggested that the modified USPHS criteria are less practical and less relevant, with limited sensitivity and categories that may not comprehensively reflect the clinical success of restorations compared to the FDI criteria [ 34 , 35 ].…”

Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study

“…The lithium disilicate for dental restorations was introduced in 2006 and is marketed in a pre-crystalline phase that, after machining, undergoes a firing process to reach the final selected color [1]. Several clinical studies with full and partial overlay restorations have been carried out with this material, showing promising results [2][3][4]. In a literature review conducted by Pieger et al, including research conducted on lithium disilicate glass-ceramic, a 97.8% survival rate was observed in the five-year follow-up [5].…”