Effect of Re-Pressing of Lithium Disilicate Ceramic with different weight percentages on Colour, Translucency & Shear Bond Strength to veneering material | ||||
| Egyptian Dental Journal | ||||
| Article 1, Volume 66, Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), July 2020, Page 1627-1636 PDF (1.53 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2020.35039.1169 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Shereen Kotb Salem   1; Mohammed Moustafa Shalaby 2
| ||||
| 1Fixed Prosthodontics October 6 University, Giza, Egypt | ||||
| 2Fixed prosthodontics department, Faculty of dentistry, Minia University, Minia | ||||
| Abstract | ||||
| Aim:Investigate effect of repressing of Lithium disilicate ceramic with different weight percentages on color,translucency & bond strength with veneering material. Materials & Methods:Thirty discs were constructed & divided according to weight percentage of newly pressed & repressed ceramic.Group1 samples were 100%new ceramics. Group2 discs were 75%new,25% repressed ceramic. Group3 samples were 50% new,50%repressed ceramic. Group4 samples were 25%new,75%repressed ceramic. Group5 discs were 100%repressed ones.One sample from each group was randomly selected for SEM test.The remaining discs in each group(5 samples)were used to test color & translucency, then these samples were veneered with porcelain & subjected to shear bond strength test. Results:Results showed ΔE of the tested groups were in the clinical accepted range except the 100%repressed group.There was no significant difference between all tested groups as related to translucency.As regard bond strength, there was no significant difference between 100%new group & the 75%new+25%repressed group. No significant difference was recorded between the 75%new+25%re-pressed group and the 50%new+50%re-pressed group.There was a significant difference between 100%new group & 50%new + 50%repressed group which was also different than 25%new+75%re-pressed group.There was a significant difference between the 100%re-pressed group & the 25%new+75%re-pressed group. Conclusions:The mix of new ingot with repressed ceramic are in the clinical acceptance range as regard ΔE.The 100 % re-pressing ceramic can affect the final colour.Ceramic repressing has no significant effect on translucency.Weight percent of repressed ceramic has a direct effect on bond strength to veneering material as increasing the percentage of repressed ceramic led to a decrease of bond strength values. | ||||
| Keywords | ||||
| Colour; microstructure; Repress; Shear bond strength; translucency | ||||
|
Statistics Article View: 333 PDF Download: 555 |
||||
