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Journal of Peking University (Health Sciences) ›› 2022, Vol. 54 ›› Issue (1): 140-145. doi: 10.19723/j.issn.1671-167X.2022.01.022

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Marginal features of CAD/CAM laminate veneers with different materials and thicknesses

LI Yi1,WONG Lai U2,LIU Xiao-qiang1,△(),ZHOU Ti3,LYU Ji-zhe1,TAN Jian-guo1   

  1. 1. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, China
    2. Stomatological College of Nanjing Medical University, Nanjing 210029, China
    3. Department of Prosthodontics, Fushan Clinical Division, Yantai Stomatological Hospital, Yantai 264001, Shandong, China
  • Received:2021-10-08 Online:2022-02-18 Published:2022-02-21
  • Contact: Xiao-qiang LIU E-mail:liuxiaoqiang@bjmu.edu.cn
  • Supported by:
    National Clinical Key Discipline Construction Project(PKUSSNMP-201901);Program for New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology(PKUSSNCT-21B01)

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Abstract:

Objective: To analyze the marginal roughness and marginal fitness of chairside computer-aided design and computer-aided manufacturing (CAD/CAM) laminate veneers with different materials and thicknesses, and to provide a reference for the clinical application of laminate veneers. Methods: The butt-to-butt type laminate veneers were prepared on resin typodonts, the preparations were scanned, and the laminate veneers were manufactured by chairside CAD/CAM equipment. The laminate veneers were divided into four groups (n=9) according to the materials (glass-matrix ceramics and resin-matrix ceramics) and thickness (0.3 mm and 0.5 mm) of the veneers, with a total of 36. The marginal topo-graphies of each laminate veneer were digitally recorded by stereomicroscope, and the marginal rough-nesses of the laminate veneers were determined by ImageJ software. The marginal fitness of the laminate veneers was measured by a fit checker and digital scanning and measuring method. At the same time, the mechanical properties of glass-matrix ceramic and resin-matrix ceramic bars (n=20) were tested by a universal testing device. Results: The marginal roughness of 0.3 mm and 0.5 mm glass-matrix ceramic laminate veneers was (24.48±5.55) μm and (19.06±5.75) μm, respectively, with a statistically significant difference (P<0.001). The marginal roughness of 0.3 mm and 0.5 mm resin-matrix ceramic laminate veneers was (6.13±1.27) μm and (6.84±2.19) μm, respectively, without a statistically significant difference (P>0.05). The marginal roughness of the glass-matrix ceramic laminate veneers was higher than that of the resin-matrix ceramic laminate veneers with a statistically significant difference (P<0.001). The marginal fitness of 0.3 mm and 0.5 mm glass-matrix ceramic laminate veneers were (66.30±26.71) μm and (85.48±30.44) μm, respectively. The marginal fitness of 0.3 mm and 0.5 mm resin-matrix ceramic laminate veneers were (56.42±19.27) μm and (58.36±8.33) μm, respectively. There was no statistically significant difference among the 4 groups (P>0.05). For glass-matrix ceramics, the flexural strength was (327.40±54.25) MPa, the flexural modulus was (44.40±4.39) GPa, and the modulus of resilience was (1.24±0.37) MPa. For resin-matrix ceramics, the flexural strength was (173.71±16.61) MPa, the flexural modulus was (11.88±0.51) GPa, and the modulus of resilience was (1.29±0.27) MPa. The flexural strength and modulus of glass-matrix ceramics were significantly higher than those of resin-matrix ceramics (P<0.001), but there was no statistically significant difference in the modulus of resilience between the two materials (P>0.05). Conclusion: The marginal roughness of CAD/CAM glass-matrix ceramic laminate veneers is greater than that of resin-matrix ceramic laminate veneers, but there was no statistically significant difference in marginal fitness among them. Increasing the thickness can reduce the marginal roughness of glass-matrix ceramic laminate veneers, but has no effect on the marginal roughness of resin-matrix ceramic laminate veneers.

Key words: Dental veneers, Ceramics, Computer-aided design, Dental marginal adaptation, Materials testing

CLC Number: 

  • R783.1

Table 1

Information of four groups of laminate veneers"

Material Thickness/mm Color Composition
Glass-matrix ceramics 0.3 LT/A2 SiO2 58.5%-72.5%, Li2O 13%-15%, K2O 3%-5%, other oxides 7.5%-25%
Glass-matrix ceramics 0.5 LT/A2 SiO2 58.5%-72.5%, Li2O 13%-15%, K2O 3%-5%, other oxides 7.5%-25%
Resin-matrix ceramics 0.3 LT/A2 Resin polymer 13%-43%, inorganic filler 55%-85%, additives <1%, colorant <1%
Resin-matrix ceramics 0.5 LT/A2 Resin polymer 13%-43%, inorganic filler 55%-85%, additives <1%, Colorant <1%

Figure 1

Resin typodont used in this study"

Figure 2

Measurement of marginal roughness of laminate veneers (Marginal curve of laminate veneer was marked by white line, marginal roughness was measured by green line)"

Figure 3

Annotation points for marginal fitness of laminate veneers"

Figure 4

Schematic diagram of 3-point flexural test"

Figure 5

Marginal topography of laminate veneers A, macrophotograph of laminate veneers, dashed box represents area observed under stereomicroscope; B-E, stereomicrograph of laminate veneers at ×50 magnification (B, 0.3 mm glass-matrix ceramics; C, 0.5 mm glass-matrix ceramics; D, 0.3 mm resin-matrix ceramics; E, 0.5 mm resin-matrix ceramics)."

Figure 6

Marginal roughness of laminate veneers * P<0.05, vs. 0.3 mm glass-matrix ceramics; # P<0.05, vs. 0.5 mm glass-matrix ceramics."

Figure 7

Marginal fitness of laminate veneers"

Table 2

Mechanical properties of ceramics"

Material Flexural strength/MPa Flexural modulus/GPa Modulus of resilience/MPa
Glass-matrix ceramics 327.40±54.25 44.40±4.39 1.24±0.37
Resin-matrix ceramics 173.71±16.61* 11.88±0.51* 1.29±0.27
P value <0.001 <0.001 0.632
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