The purpose
The purpose of this study was to evaluate the debonding of feldspathic and lithium disilicate reinforced glass ceramic veneers using Erbium lasers with two different curing mode resin cement.]
Materials and Methods:
In this study, a total of 80 ceramic specimens were used. They were divided into two groups (n= 40/group) according to ceramic material used into: Group (A) lithium disilicate (IPS Emax), Group (B) Feldspathic porcelain. (VITA MARK II). Each group was further subdivided into two subgroups according to the cement curing mode (n= 20/subgroup): Subgroup (L) Light cured resin cement, Subgroup (D) Dual cured resin cement. Er,Cr:YSGG (turbo handpiece) was used on all subgroups. Scanning electron microscope and Profilometer were used to evaluate surface tomography & roughness. Data was analyzed statistically.
Results:
For surface roughness of two ceramics at base line and after debonding .There was no statistically significant difference between median (Ra) values of the two ceramics (P-value=0.754, Effect size=0.199), (P-value= 0.825, Effect size=0.155) and (P-value=0.117, Effect size=0.245). As for the curing mode: both materials showed no statistically significant effect of curing modes (P-value = 0.425, Effect size = 0.051) and (P-value = 0.543, Effect size = 0.065), respectively.
Conclusion:
Based on the limitation of the current study ; the following conclusions can be drawn:
-Er, Cr: YSGG fluid dynamic laser system is an effective clinical application for the debonding of resin-bonded all-ceramic restorations.
- the surface topography of both ceramic materials almost the same after debonding which make their future use possible