Effect of repeated millings on the surface integrity of diamond burs and roughness of different CAD/CAM materials.
Bur wear
CAD/CAM
Dental materials
Digital dentistry
Prosthodontics
Surface roughness
Surface topography
Tribology
Journal
Clinical oral investigations
ISSN: 1436-3771
Titre abrégé: Clin Oral Investig
Pays: Germany
ID NLM: 9707115
Informations de publication
Date de publication:
Aug 2022
Aug 2022
Historique:
received:
01
11
2021
accepted:
13
04
2022
pubmed:
23
4
2022
medline:
19
8
2022
entrez:
22
4
2022
Statut:
ppublish
Résumé
This study evaluated the surface integrity of two types of diamond burs and their effect on the roughness of different CAD/CAM materials. CAD/CAM materials, Vita Mark II (VM), IPS e.max CAD (EM), Celtra Duo (CD), G-Ceram (GC), and Lava Ultimate (LU) blocks were milled with CEREC MCXL. Five pairs of pointed cylinder burs (CB) and step burs (SB) were used repeatedly. The wear rate of burs was analyzed before and after milling with a scanning electron microscope (SEM) and weighing the burs. The milling time of the blocks at different milling stages was recorded from 2 (M2) to 8 times (M8) of use. The surface roughness (Ra) of blocks was measured with a profilometer. Data from the differences in surface roughness were analyzed using univariate analyses of variance and Kruskal-Wallis tests (alpha = 0.05). For M2, the highest roughness (2.12 ± 0.1 μm) was observed with the VM block. EM blocks presented the highest roughness values (1.82 ± 0.3 μm, 1.85 ± 0.1 μm, and 1.86 ± 0.04 μm) at M4, M6, and M8, respectively. While the highest Ra values were observed for VM (2.12 to 1.43 µm), LU provided the lowest mean Ra (1.62 to 1.33 µm) among the tested materials. After the repeated use of burs up to 8 times, the surface roughness of all the tested materials decreased. Milling of LU resulted in chip deposits on the CB surface in SEM images. The duration of cutting was higher for CD and EM materials than those of other materials, but the milling duration for VM, GC, and LU blocks was similar. SB burs exhibited more wear than CB after repeated milling. A repeated number of millings more than 4 times decreased the surface integrity of the milling burs, increased the surface roughness of CAD/CAM blocks except for LU, and increased the milling duration. Increased material hardness was more detrimental on bur surface integrity. During milling CAD/CAM blocks, clinicians should note that the surface integrity of milling burs decreases after 4 times of use as a function of material hardness where step burs wear quicker than pointed cylinder burs.
Identifiants
pubmed: 35449245
doi: 10.1007/s00784-022-04500-2
pii: 10.1007/s00784-022-04500-2
doi:
Substances chimiques
Composite Resins
0
Dental Materials
0
Dental Porcelain
12001-21-7
Diamond
7782-40-3
Types de publication
Journal Article
Langues
eng
Pagination
5325-5337Informations de copyright
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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