An in vitro comparative study of the marginal fit of six types of cervical finish lines

Authors

Keywords:

Dental Marginal Adaptation, Tooth Preparation, dental crowns, Dental Prosthesis Design, Chile

Abstract

Introduction: The design of tooth-supported fixed prostheses includes basic elements such as the cervical finish line, which represents the zone of the junction between the prepared tooth structures and the margin of a restorative material. The choice of the type of finish line is determined by several factors, therefore, the design of the cervical finish line determines the form and the tooth reduction, that is carried out in the marginal area.

Objective: To determine which cervical termination design achieves the lowest marginal fit.

Methods: A preliminary in vitro comparative study, using a convenience sampling, was carried out. Forty-eight complete peripheral preparations were carved from rolled steel cylinders. Then, the samples were divided into six groups, according to their finish line: knife edge, chamfer, straight shoulder, 45º beveled straight shoulder, 85º beveled straight shoulder, and sloped shoulder. Each group of samples with their cemented caps was embedded in transparent, self-polymerizing acrylic. The samples were sectioned axially and examined with a scanning electron microscope.

Results: The finish lines with the lowest absolute marginal discrepancy were the 45º beveled straight shoulder (54.3 μm ± 16.3), the sloped shoulder (73.6 μm ± 26.1), and the chamfer (76.1 μm ± 39.0).

Conclusions: There was no statistically significant difference among the three terminations with the lowest absolute marginal discrepancy. The 45° beveled straight shoulder was the cervical finish line with the best mean marginal fit, but the smallest absolute marginal discrepancy occurred at the chamfer.

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References

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Published

2025-06-07

How to Cite

1.
Zubicueta Gallardo ME, Romo Ormazábal FE, Chaple Gil AM, Cortés Rojas R, Dí­az Agurto L, Toro-González MA. An in vitro comparative study of the marginal fit of six types of cervical finish lines. Rev Cubana Estomatol [Internet]. 2025 Jun. 7 [cited 2025 Jul. 8];62:e5051. Available from: https://revestomatologia.sld.cu/index.php/est/article/view/5150

Issue

Vol. 62 (2025): In Press

Section

Research Article

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Copyright (c) 2025 María Eliana Zubicueta Gallardo, Fernando Ernesto Romo Ormazábal, Alain Manuel Chaple Gil, Ricardo Cortés Rojas, Leonardo Díaz Agurto, Mauricio Antonio Toro-González

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