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Journal of Peking University (Health Sciences) ›› 2023, Vol. 55 ›› Issue (1): 78-81. doi: 10.19723/j.issn.1671-167X.2023.01.011

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Influence of paper mixing pads thickness on the compressive strength of glass ionomer cement

Qian-mei ZHOU1,Rui-yu DING2,Li LI1,Wei BAI3,Jing-ying HU1,*()   

  1. 1. Department of General Dentistry Ⅱ, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering and Technology for Computerized Dentistry & NMPA Key Laboratory for Dental Materials, Beijing 100081, China
    2. Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering and Technology for Computerized Dentistry & NMPA Key Laboratory for Dental Materials, Beijing 100081, China
    3. Department of Dental Materials, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering and Technology for Computerized Dentistry & NMPA Key Laboratory for Dental Materials, Beijing 100081, China
  • Received:2022-10-10 Online:2023-02-18 Published:2023-01-31
  • Contact: Jing-ying HU E-mail:hjingying@sina.com
  • Supported by:
    Youth Research Fund of Peaking University Hospital of Stomatology(PKUSS20160203)

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Abstract:

Objective: To explore the influence of the thickness of mixed cardboard on the compressive strength of glass ionomer cement and the associated factors. Methods: Three different types of glass ionomer cements were mixed on the top of 60, 40, 20 and 1 pieces of paper (P60, P40, P20 and P1), respectively. The compressive strength of the materials was tested after solidification, and the bubble rate was calculated with the assistance of scanning electron microscope. Results: (1) Compressive strength: ① ChemFil Superior glass ionomer (CF): The average compressive strength of P1 group was the highest, which was significantly different from that of P40 and P60 groups (P values were 0.041 and 0.032 respectively); ② To Fuji IX GP glass ionomer (IX): The average compressive strength of P1 group was the highest, which was statistically different from that of P40 and P60 groups (P values were 0.042 and 0.038 respectively); ③ Glaslonomer FX-Ⅱ glass ionomer cement (FX): The average compressive strength of P1 group was the highest, which was statistically different from that of P20, P40 and P60 groups (P values were 0.031, 0.040 and 0.041 respectively), but there was no statistical difference among the other groups. All the three materials showed that the compressive strength of glass ions gradually increased with the decrease of the thickness of the blended paperboard, and the two materials had a highly linear negative correlation, the correlation coefficients of which were CF-0.927, IX-0.989, FX-0.892, respectively. (2) Scanning electron microscope: P1 group had the least bubbles among the three materials. Conclusion: It indicates that the thickness of mixed cardboard has a negative correlation with the compressive strength of glass ions. The thicker the mixed cardboard is, the greater the elasticity is. Excessive elasticity will accelerate the mixing speed when the grinding glass ions. Studies have shown that the faster the speed of artificial mixing is, the more bubbles is produced.The thicker ther mixed cardboard is, the more bubblesn are generated by glass ionomer cement, and the higher the compressive strength is. Using one piece of paper board to mix glass ionomer cement has the least bubbles and can obtain higher compressive strength.

Key words: Glass ionomer cement, Mixing board, Compressive strength, Porosity

CLC Number: 

  • R783.1

Table 1

Compressive strength of different paperboard thicknesses"

Group Sample size Type of cement/MPa, ${\bar x}$±s
CF IX FX Total
P1 5 202.9±24.2 205.0±32.3 206.0±31.2 204.3±22.4
P20 5 192.6±23.1 200.1±26.9 193.5±24.6 189.0±27.5
P40 5 185.1±22.9 197.9±26.3 184.1±18.8 191.4±27.3
P60 5 185.2±22.9 195.4±25.3 186.3±18.7 194.7±23.6

Figure 1

Scanning electron microscope of material CF CF, ChemFil Superior glass ionomer; A, P1; B, P20; C, P40; D, P60. Group P1 has the least bubbles."

Figure 2

Scanning electron microscope of material FX IX, To Fuji IX GP glass ionomer; A, P1; B, P20; C, P40; D, P60. Group P1 has the least bubbles."

Figure 3

Scanning electron microscope of material IX FX, Glaslonomer FX-Ⅱ glass ionomer cement; A, P1; B, P20; C, P40; D, P60. Group P1 has the least bubbles."

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[1] Jing-ying HU,Li LI,Qian-mei ZHOU,Rui-yu DING,Ran SHANG,Wei BAI. Influence of different mixing pads on physical and mechanical properties of glass ionomer cement [J]. Journal of Peking University(Health Sciences), 2019, 51(5): 964-967.
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