EVALUATION OF ADAPTATION AND WEAR SIMULATION OF INNOVATIVE TOOTH-COLORED PRIMARY POSTERIOR CROWNS
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Abstract
Purpose: The aim of this study was to evaluate the adaptation and wear simulation of innovative tooth-colored primary posterior crowns, specifically comparing ceramic (Zirconia) crowns and glass-reinforced fiber composite (FRC) crowns.
Material and methods: Fourteen posterior crowns from two manufacturers were used: Elephant Plus Zirconia crowns (Ceramic) and Figaro Glass-reinforced fiber composite crowns (FRC). Crowns were cemented to their respective master dies and the vertical marginal gaps were measured using a digital microscope and analyzed with Image J software. A wear simulation was performed utilizing a programmable logic controlled four-station multimodal ROBOTA chewing simulator, which included a thermocyclic protocol , simulating 3 months of clinical chewing conditions. Surface roughness was measured using optical profilometry and analyzed with WSxM software.
Results: The FRC group showed a significantly greater vertical marginal gap mean score (69.36 ± 8.84 µm) compared to the Ceramic group (26.44 ± 7.05 µm) (p < 0.0001). Surface roughness results indicated no significant difference between the groups before wear simulation, with the Ceramic group at 0.2496 ± 0.03 µm and the FRC group at 0.2395 ± 0.22 µm (P=0.494). After wear simulation, the roughness remained statistically non-significant between the Ceramic group (0.2609 ± 0.025 µm) and the FRC group (0.2533 ± 0.023 µm) (P=0.5667).
Conclusion: Ceramic crowns demonstrated superior marginal adaptation compared to FRC crowns, making them a preferable choice for scenarios requiring high precision. However, both materials exhibited similar wear resistance and surface roughness characteristics, indicating their viability for long-term restorative solutions in pediatric dentistry. Further research with larger sample sizes and long-term clinical trials is recommended to validate these findings.
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Mahmoud El-Said Ahmed Abd El-Aziz
Lecturer of Dental Biomaterials, Faculty of Dental Medicine (Assiut), Al-Azhar University, Assiut, Egypt.
Mohamed Aboelkasme Wakwak
lecturer of pedodontics and oral health, Faculty of Dental Medicine (Assiut), Al-Azhar University, Assiut, Egypt.
Yousef Hamed Abokhlifa
Assistant Professor of Paediatrics Dentistry and Dental Public Health, Faculty of Dental Medicine Al-Azhar University, Cairo, Egypt.
Alaa Nabil Abbas
Lecturer of Pedodontics and Oral Health Department Faculty of Dental medicine (Cairo -Boys) Al-Azhar University, Egypt.
Salam Mohamed EL Araby
Lecturer of Pedodontics and Oral Health department, Faculty of Dental Medicine Girls branch AL -Azhar University, Egypt.
Abdelhamid Abuelyazid Eissa
Lecturer of pedodontics and public health department faculty of dental medicine Al-Azhar University, Egypt.
Mohamed Galal Aboelsoud
Lecturer of pedodontics and public health department faculty of dental medicine Al-Azhar university, Egypt.
Ashraf Marawan El Azzazy
Lecturer, Department of Dental Biomaterial, Faculty of Dental Medicine, Assiut, Al- Azhar University, Egypt.
Waled Omar Ameen Kadour
Lecturer of pedodontics and public health department faculty of dental medicine Al-Azhar university, Egypt.
Alaa N. Syam
Assistant Professor of Dental Biomaterial, Faculty of Dental Medicine, Assiut, Al- Azhar University, Egypt.