Volume 24, Issue 103, May - June, 2020

Comparison of shoulder & chamfer finish line designs on marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations

Reza Godazpour¹, Asadollah Ahmadzadeh^1♦, Ali Rohani², Farnaz Jafarizadeh²

¹Assistant Professor, Department of Prosthodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
²Dentist, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

^♦Corresponding author
Assistant Professor, Department of Prosthodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

ABSTRACT

Background and Objective: Marginal accuracy is considered as a fundamental aspect in the success and longevity of indirect restoration. The aim of present study was to compare shoulder & chamfer finish line designs on marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations. Materials and methods: An extracted intact maxillary first premolar tooth was selected for the study. A chamfer finish line design (50°, 0.8 mm deep) was prepared using a cylinder round end diamond bur and impression was taken using polyvinyl siloxane impression material and a cast was fabricated. The impression process was repeated 20 times with the same coping. The 50 °chamfer margin then turned to 90° shoulder margin (1 mm deep). Resin dies were prepared and impressions of each epoxy resin die were made and poured with stone die. A total 20 IPS e.max Press and 20 IPS e.max ZirCAD were made on the stone dies and the marginal gap was assessed using scanning electron microscope (SEM). Data were analyzed using two-way ANOVA, SPSS ver, 19. Results: The marginal gap in chamfer ZirCAD was 21±43.54μ and in chamfer Press was 9±50.77μ and the marginal gap in shoulder ZirCAD was 21±67.12μ and in chamfer Press was 25±95.97μ. The differences were statistically significant (P<0.05). Conclusion: Marginal adaptation in chamfer finish line is preferred than shoulder finish line (P=0.000), as well as ZirCAD restoration produces a good marginal adaptation than Press restoration (P=0.011). The marginal gaps achieved by the restorations (<120 microns) is clinically acceptable.

Keywords: Finish Line Designs, Marginal Adaptation, Restorations

Medical Science, 2020, 24(103), 1514-1519

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