Marginal Adaptation and Internal Fit of All Ceramic Crowns Fabricated with Pressed
Versus Milled Zirconia Reinforced Lithium Silicate (An In-vitro study)
Fahmi Y1*, Taymour M2 and El Naggar G3
1MSc Degree Student, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
2Associate Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Cairo, Egypt and Associate Professor, Fixed Prosthodontics Division, School of Dentistry, Newgiza University, Giza, Egypt
3Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
*Corresponding Author: Fahmi Y, MSc Degree Student, Fixed Prosthodontics
Department, Faculty of Dentistry, Cairo University, Cairo, Egypt.
Received: March 14, 2022; Published: March 21, 2022
Aim: Evaluate the marginal adaptation and internal fit of Zirconia reinforced Lithium silicate crowns fabricated with heat pressed “Celtra Press” ingots compared to crowns fabricated with milled “Celtra Duo” blocks.
Methodology: Ten zirconia reinforced lithium silicate crowns were studied and divided into two groups according to fabrication method; heat pressed group and milled group. A stainless-steel die was prepared according to the all-ceramic tooth preparation criteria. The metal die was scanned by intraoral scanner (CEREC Omnicam). Group I (n = 5) was constructed by means of heat pressing of milled wax patterns into Celtra Press ingots. Group II (n = 5) was milled from Celtra DUO blocks. Each crown was placed on the metal die and the vertical marginal adaptation was measured by direct viewing method using a stereomicroscope. The internal fit of crowns was measured using silicone replica technique. Data were statistically analysed by 1-way ANOVA, followed by the Tukey honestly significant difference test (P < 0.05).
Results: The mean values of vertical marginal gap were 24.69 ± 1.28 μm for the heat-pressed group and 24.23 ± 1.26 μm for the milled group, with statistically non-significant difference between both groups. The mean values of internal gap were 60.77 ± 6.3 μm for the heat-pressed group and 93.94 ± 1 μm for the milled group. There was statistically significant difference between both groups in terms of internal fit.
Conclusions: Within the limitations of this in-vitro study, it can be concluded that the manufacturing technique of zirconia reinforced lithium silicate has no effect on the vertical marginal adaptation of the crowns. Heat pressing of zirconia reinforced lithium silicate crowns produced more favorable internal fit compared to milling technique. The marginal and internal gaps achieved by the crowns across all groups were within a clinically acceptable range.
Keywords: Zirconia Reinforced Lithium Silicate; Milled; Heat Pressed; Marginal Adaptation; Internal Fit
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