IADR Abstract Archives
Stability of Silane to Lithium Disilicate in Extreme Environmental Conditions
Objectives: Application of silane to lithium disilicate restorations by the dental laboratory prior to shipping the ceramic restoration to the dentist may protect the intaglio surface from contamination prior to bonding. The objective of this study is to determine if temperature and light storage conditions encountered during shipping will affect bond between silane-covered lithium disilicate (e.max) and resin cement.
Methods: 80 e.max coupons were polished (320-grit SiC/15 sec/90° rotation/total 1min), ultrasonicated (distilled water/5min), and coated with silane (RelyX Silane or Monobond Etch and Bond following manufacturers’ instructions. With RelyX Silane, e.max was etched (5% HF/20sec), rinsed, and dried for 5sec. Silane was applied for 20sec and dried for 10sec. Monobond Etch and Prime, with an ammonium polyfluoride etchant (contains acid) was applied for 20sec, left to react on the surface for 40sec, rinsed, and dried for 10sec. E.max specimens coated with silane were placed in direct light (1hr/22°C), cold (48hrs/-21°C), hot (48hrs/37°C), or immediately bonded (control). Variolink Esthetic DC cement-filled tubes (d=1.5mm) were bonded and light polymerized (Elipar S10/713mW/cm2). Bonded samples were stored in an incubator (saline/24hrs/37°C) and debonded in shear using a universal testing machine (1mm/min). Data were analyzed using a 2-way ANOVA for silane material and storage condition.
Results: Obtained data is presented in Table 1. No significant difference was found in storage conditions (p=0.144) and between storage condition and material (p=0.145). RelyX Silane produced significantly greater SBS than Monobond Etch and Prime (p=0.026).
Conclusions: Exposure of silane to light, extreme cold, and extreme heat did not adversely affect the stability of silane on e.max. Both RelyX Silane and Monobond Etch and Prime performed well under 24hrs storage conditions.
Methods: 80 e.max coupons were polished (320-grit SiC/15 sec/90° rotation/total 1min), ultrasonicated (distilled water/5min), and coated with silane (RelyX Silane or Monobond Etch and Bond following manufacturers’ instructions. With RelyX Silane, e.max was etched (5% HF/20sec), rinsed, and dried for 5sec. Silane was applied for 20sec and dried for 10sec. Monobond Etch and Prime, with an ammonium polyfluoride etchant (contains acid) was applied for 20sec, left to react on the surface for 40sec, rinsed, and dried for 10sec. E.max specimens coated with silane were placed in direct light (1hr/22°C), cold (48hrs/-21°C), hot (48hrs/37°C), or immediately bonded (control). Variolink Esthetic DC cement-filled tubes (d=1.5mm) were bonded and light polymerized (Elipar S10/713mW/cm2). Bonded samples were stored in an incubator (saline/24hrs/37°C) and debonded in shear using a universal testing machine (1mm/min). Data were analyzed using a 2-way ANOVA for silane material and storage condition.
Results: Obtained data is presented in Table 1. No significant difference was found in storage conditions (p=0.144) and between storage condition and material (p=0.145). RelyX Silane produced significantly greater SBS than Monobond Etch and Prime (p=0.026).
Conclusions: Exposure of silane to light, extreme cold, and extreme heat did not adversely affect the stability of silane on e.max. Both RelyX Silane and Monobond Etch and Prime performed well under 24hrs storage conditions.