en Research Paper Research Paper <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif"><span lang="EN" style="font-size:12.0pt"><span style="line-height:107%"><span new="" roman="" style="font-family:" times="">ZrO₂ is commonly incorporated into ceramic glass substrates to enhance radiopacity, mechanical strength, and chemical durability. Experience has shown that the crystallization of tetragonal zirconia in glass will have a greater effect on the mechanical properties of ceramic glass. To achieve optimal properties in zirconia, stabilizing oxides are often added to enhance its structural and mechanical qualities. In this research, in order to stabilize the tetragonal phase of zirconia, MgO and CeO₂ were added to the glass ceramic composition of the Li₂O-SiO₂-ZrO₂ system and the desired dental substrate was synthesized through the sinter process. The behavior of sintering and crystallization of basic and optimized glass was investigated using HSM and DTA thermal analysis, respectively. The results showed that the optimal sinter temperature, heat press and heat treatment are equal to 730&deg;C, </span></span></span><span lang="EN" style="font-size:12.0pt"><span style="line-height:107%"><span style="font-family:Symbol">900</span></span></span><span lang="EN" style="font-size:12.0pt"><span style="line-height:107%"><span new="" roman="" style="font-family:" times="">&deg;C and 825&deg;C, respectively. Then, in order to determine the crystallization behavior of the prepared samples, X-ray diffraction and microstructure images were used. The results also showed that the presence of the main Li₂ZrSi₆O₁₅ phase crystallizes at a temperature of 825&deg;C in the base sample and the sample containing ceria. Also, due to early formation of MgSiO₃ crystals, magnesia prevents sintering and formation of Li₂ZrSi₆O₁₅phase and stability of tetragonal zirconia phase. In the sample containing ceria, during crystallization, ZrO₂ entered its crystal structure and led to the stability of the tetragonal zirconia phase at room temperature.</span></span></span><span dir="RTL" lang="AR-SA" style="font-size:12.0pt"><span style="line-height:107%"><span style="font-family:"Times New Roman",serif"></span></span></span></span></span></span> Glass ceramic,Dental glass ceramic,stabilized zirconia,IPS Empress Cosmo. 163 167 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5545-3&slc_lang=en&sid=1 Zahra Ghoreishy zahra.12.ghoreishy@gmail.com 1800319475328460019087 1800319475328460019087 Yes Iran University of Science and Technology bijan eftekhari yekta beftekhariyekta@iust.ac.ir 1800319475328460019088 1800319475328460019088 No Iran University of Science and Technology