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An extracted maxillary first premolar was prepared with chamfer (50°, 0.8 mm), impression and die fabrication were repeated 20 times, then margins were converted to 90° shoulder (1 mm). Marginal gaps were measured using SEM and analyzed by two-way ANOVA. Results showed clinically acceptable marginal gaps (\u003C120 microns) with statistically significant differences between designs and 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\nComparison of shoulder & chamfer finish line designs on marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations  \nReza Godazpour 1, Asadollah Ahmadzadeh 1􀀍 , Ali Rohani2, Farnaz Jafarizadeh2  \n1Assistant Professor, Department of Prosthodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.  \n2 Dentist, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran  \n􀀍 Corresponding author  \nAssistant Professor, Department of Prosthodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran  \nArticle History  \nReceived: 21 February 2020  \nReviewed: 22/February/2020 to 20/March/2020  \nAccepted: 21 March 2020  \nE-publication: 29 March 2020  \nP-Publication: May-June 2020  \nCitation  \nReza Godazpour, Asadollah Ahmadzadeh, Ali Rohani, Farnaz Jafarizadeh. Comparison of shoulder & chamfer finish line designs on marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations. Medical Science, 2020, 24(103), 1514-1519  \nPublication License  \n This work is licensed under a Creative Commons Attribution 4.0 International License.  \nGeneral Note  \n Article is recommended to print as color digital version in recycled paper.  \nABSTRACT  \nBackground 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  \nPage 1514  \n© 2020 Discovery Publication. Al[l Rights Reserved. www.discoveryjournals.org](l Rights Reserved. www.discoveryjournals.org)  \nOPEN ACCESS  \n\n| ANALYSIS | ARTICLE |\n| --- | --- |\n\nwas 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\u003C0 .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 (\u003C120 microns) is clinically acceptable.  \nKeywords: Finish Line Designs, Marginal Adaptation, Restorations  \n1. INTRODUCTION  \nAll ceramic restorations introduced in aesthetic dentistry provide the best optical and aesthetic properties including natural appearance, outstanding mechanical, optical, thermal, and chemical properties. The use of all-ceramic restorations due to biocompatibility, aesthetics, low thermal conductivity, abrasion resistance, and colour stability have become the basis of the modern practice of fixed prosthodontics. All-ceramic restorations (non-metallic compound) are favorable alternatives to metal-ceramic and all-metal restorations. The metallic component of restorations can be problematic due to chemical toxicity, Kerogen, gingival colour changes, and allergic reactions to certain metals such as nickel. As well as, achieving a close shade match in metal ceramic ","cbCaigK62qmM4zkL","https://ap.wps.com/l/cbCaigK62qmM4zkL","pdf",330193,"English","# ABSTRACT\n## Background and objective\n## Materials and methods\n## Results\n## Conclusion\n# INTRODUCTION\n## Rationale for all-ceramic restorations\n## Importance of marginal fit and finish line design\n# MATERIALS AND METHODS","[{\"question\":\"What was the aim of the study?\",\"answer\":\"To compare shoulder and chamfer finish line designs on the marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations.\"},{\"question\":\"How were the marginal gaps assessed?\",\"answer\":\"Marginal gaps were measured using scanning electron microscope (SEM) after impressions and die fabrication across repeated preparations.\"},{\"question\":\"Which design and material showed better marginal adaptation?\",\"answer\":\"Chamfer finish lines were preferred over shoulder finish lines, and ZirCAD restorations produced better marginal adaptation than Press restorations, with statistically significant differences.\"}]","Medical Science - Comparison of shoulder & chamfer finish line designs on marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations | PDF",1790540812,15]