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

Q: What was the aim of the study?

To compare shoulder and chamfer finish line designs on the marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations.

Q: How were the marginal gaps assessed?

Marginal gaps were measured using scanning electron microscope (SEM) after impressions and die fabrication across repeated preparations.

Q: Which design and material showed better marginal adaptation?

Chamfer finish lines were preferred over shoulder finish lines, and ZirCAD restorations produced better marginal adaptation than Press restorations, with statistically significant differences.

Sep 27, 2026

Uploaded by Đào

Marginal accuracy is a fundamental factor for the success and longevity of indirect restorations. This study compared two finish line designs—shoulder and chamfer—regarding marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations. 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 (<120 microns) with statistically significant differences between designs and materials.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

ABSTRACT

Background and objective

Materials and methods

Results

Conclusion

INTRODUCTION

Rationale for all-ceramic restorations

Importance of marginal fit and finish line design

MATERIALS AND METHODS

ANALYSIS ISSN 2321–7359 EISSN 2321–7367 24(103), May-June, 2020 Medical Science Comparison of shoulder & chamfer finish line designs on marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations Reza Godazpour 1, Asadollah Ahmadzadeh 1􀀍 , Ali Rohani2, Farnaz Jafarizadeh2 1Assistant Professor, Department of Prosthodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. 2 Dentist, 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 Article History Received: 21 February 2020 Reviewed: 22/February/2020 to 20/March/2020 Accepted: 21 March 2020 E-publication: 29 March 2020 P-Publication: May-June 2020 Citation Reza 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 Publication License This work is licensed under a Creative Commons Attribution 4.0 International License. General Note Article is recommended to print as color digital version in recycled paper. 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 Page 1514 © 2020 Discovery Publication. Al[l Rights Reserved. www.discoveryjournals.org](l Rights Reserved. www.discoveryjournals.org) OPEN ACCESS | ANALYSIS | ARTICLE | | --- | --- | 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 1. INTRODUCTION All 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

FAQs

What was the aim of the study?

To compare shoulder and chamfer finish line designs on the marginal adaptation of IPS e.max Press and IPS e.max ZirCAD restorations.

How were the marginal gaps assessed?

Marginal gaps were measured using scanning electron microscope (SEM) after impressions and die fabrication across repeated preparations.

Which design and material showed better marginal adaptation?

Chamfer finish lines were preferred over shoulder finish lines, and ZirCAD restorations produced better marginal adaptation than Press restorations, with statistically significant differences.

Sep 27, 2026

Uploaded by Đào