European Journal of Prosthodontics and Restorative Dentistry

Cutting Efficiency of Diamond Burs with Different Coatings on Ceramic and Resin Composite Materials after Multiple Use

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Cover Date

June 2025

Print ISSN

0965-7452

Vol

33

Issue

2

Abstract

Objectives: This study evaluated the cutting efficiency of dental burs with different surface coatings on various reconstruction materials and analyzed the microscopic changes after multiple uses. Methods: Thirty block specimens (N=35, n=7) were prepared from various materials: CAD/CAM PMMA, direct resin composite, lithium disilicate, CAD/CAM nano-hybrid composite, and zirconia (12x4x4 mm³). The specimens were randomly assigned to cut under water cooling with one of seven bur types: Bur 1 (FG 307 CB), Bur 2 (6881.314.016), Bur 3 (FG 307 C), Bur 4 (ZR6881.314.016), Bur 5 (Prototype), Bur 6 (Prototype), and Bur 7 (Prototype). Each bur was used 10 times with a cutting depth of 3 mm. Images were taken of unused, used, and ultrasonically cleaned burs prior to data analysis (α=0.05). Results: Cutting efficiency varied significantly by material and bur type (p<0.05). Bur 3 and Bur 5 were most effective for PMMA, while Burs 5, 6, and
7 excelled with direct resin composite. Bur 7 was best for CAD/CAM composite, Bur 3 for lithium disilicate, and Bur 6 for zirconia. Burs 1 and 2 consistently performed poorly. Significance: Bur selection is important for efficient cutting, reducing chair time, material wear, and costs while improving restoration precision and bur longevity.

Keywords
CAD/CAM
Dental Burs
Dental Materials
Lithium Disilicate
Nano-Hybrid Composite
Zirconia