Abstract:
Background: Sectional veneers constructed from different glass ceramic can show
variations in the marginal adaptation before and after thermocycling.
Methodology: 20 human central incisors were used to fabricate sectional laminate
veneers SLV with preparation depth 0.5mm cervically and 0.7mm incisally. Samples
were divided equally into groups according to material Group 1: Lithium disilicate
Glass-Ceramic (IPS e-max press, Ivoclar, Schaan Liechtenstein) (n=10) and Group 2:
zirconia reinforced lithium silicate Glass-Ceramic (Celtra Press, Dentsply Sirona)
(n=10). SLV were bonded to the teeth using lightcure resin cement (Relyx veneer) (3M
ESPE, Seefeld, Bayern, Germany). The samples were then subjected to 10,000 thermal
cycles, the marginal adaptation was measured before and after thermocycling using
stereomicroscope under magnification 40X using 8 measurement points for each
margin (incisal, proximal, cervical and mid labial in two different positions) with total
of 40 point per sample.
Results: The results of ANOVA showed a significant interaction between material and
thermocycling. Before thermocycling, e.max samples showed statistically significant
higher gap values with (p<0.001) Mean and standard deviation (SD) values
(34.80±0.71) than Celtra samples with (p<0.001) (26.33±2.28). While after
thermocyling, Celtra samples had significantly higher gap values (53.77±6.67) than
e.max samples (42.81±1.67).
Conclusions: IPS e.max Press SLV showed better marginal adaptation compared to
that of Celtra Press after thermocycling. Insufficient sealing between restoration and
tooth may lead to leakage and marginal discoloration in sectional veneers after years of
service.
© 2022 MSA. All rights reserved.
∗ Corresponding author. E-mail address: drahmedamer@outlook.com
1 Master Degree in Faculty of Dentistry, October
University for Modern Sciences and Arts
2 Professor of Fixed Prosthodontics, Faculty of Dentistry,
October University for Modern Sciences and Arts
3 Lecturer of Fixed Prosthodontics, Faculty of Dentistry,
October University for Modern Sciences and Arts
