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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (5): 964-967. doi: 10.19723/j.issn.1671-167X.2019.05.029

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Influence of different mixing pads on physical and mechanical properties of glass ionomer cement

Jing-ying HU1,Li LI1,Qian-mei ZHOU1,Rui-yu DING2,△(),Ran SHANG2,Wei BAI3   

  1. 1. Department of General Dentistry Ⅱ, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
    2. Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
    3. Department of Dental Materials, Peking University School and Hospital of Stomatology &National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2019-02-28 Online:2019-10-18 Published:2019-10-23
  • Contact: Rui-yu DING E-mail:drydentist@163.com
  • Supported by:
    Supported by Youth Research Fund of Peaking University Hospital of Stomatology(PKUSS20160203)

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Abstract:

Objective: To analyze the influence of different mixing pads on the physical and mechanical properties of glass ionomer cement.Methods: Three different glass ionomer base cements were mixed with a plastic spatula on three different mixing pads including paper pad, glass pad and silicon pad whose HS were 40, 60 and 80. The GIC was packed into stainless steel molds to get specimens. Surface roughness、surface hardness and compressive strength were evaluated. Results: As for compressive strength, CF: There was the highest mean compressive strength that was significantly higher than those of silicon pad 60 group, paper 60 group and paper 20 group in silicon pad 40 group,the differences P values were 0.002 0.027, and 0.036, statistically significant difference between the above groups (P<0.05). IX:there was the highest mean compressive strength that was significantly higher than those of silicon pad 60 group in paper pad 20 group,the differences P value was 0.008, statistically significant (P<0.05). FX:there was the highest mean compressive strength that was no significantly higher than those of paper pad 20 group in silicon pad 40 group, but was significantly higher than those of the other groups. As for surface hardness, CF: there was the highest mean surface hardness that was significantly higher than those of silicon pad 60 and 80 group, paper 60 group in silicon pad 40 group, the differences P value was 0.021, 0.001, 0.032, 0.008 and 0.016, statistically significant difference between the above groups (P<0.05). IX and FX: there was no statistical significance between any two groups in surface hardness. As for surface roughness, CF: there was no statistical significance between any two groups in surface roughness. IX: there was the lowest mean surface roughness that was significantly lower than those of paper pad 40 and 60 group in glass pad group, the differences P values were 0.003 and 0.027, statistically significant difference between the above groups (P<0.05). FX: there was the lowest mean surface roughness that was significantly lower than those of paper pad 60 group in glass pad group, the differences P value was 0.018, showing a statistical difference (P<0.05). Conclusion:Mixing glass ionomer cement on silicon pad 40 results in higher compressive strength and lower surface roughness, worthy of clinical popularization.

Key words: Glass ionomer cement, Mixing board, Surface roughness, Surface micro-hardness, Compressive strength

CLC Number: 

  • R783.1

Table 1

Compressive strength of different mixing boards"

Group Sample size Type of cement/MPa, x?±s
CF IX FX Total
Paper 20 15 169.7±20.5 233.6±29.8 186.0±17.0 196.4±35.3
Paper 40 15 187.0±9.5 199.6±24.8 139.8±39.0 175.9±36.7
Paper 60 15 160.9±27.7 169.1±48.6 136.8±23.4 155.6±35.4
Silica gel 40 15 214.3±18.2 208.0±18.5 215.1±23.1 212.5±18.9
Silica gel 60 15 155.5±4.9 151.5±51.7 138.0±26.1 148.3±32.0
Silica gel 80 15 188.0±15.2 174.6±26.3 87.4±23.9 150.0±50.6
Glass plate 15 180.8±24.1 205.1±49.2 196.9±44.9 194.3±39.3

Table 2

Surface micro- hardness of different mixing boards"

Group Sample Size Type of cement/HV, x?±s
CF IX FX Total
Paper 20 15 67.1±8.2 6.8±3.4 61.4±9.8 63.1±8.0
Paper 40 15 53.1±9.7 76.3±7.2 59.6±16.2 63.0±15.2
Paper 60 15 51.4±3.2 67.2±6.2 68.4±3.2 62.3±8.9
Silica gel 40 15 72.9±13.3 64.2±7.4 64.6±4.8 67.2±10.0
Silica gel 60 15 51.4±3.2 70.2±18.0 48.3±12.2 56.6±16.0
Silica gel 80 15 43.9±7.2 56.9±9.2 51.2±8.2 50.7±9.8
Glass plate 15 52.8±10.2 61.8±7.2 68.3±3.1 61.0±9.8

Table 3

Surface roughness of different mixers"

Group Sample Size Type of cement/μm, x?±s
CF IX FX Total
Paper 20 15 2.1±0.8 1.2±0.5 0.5±0.1 1.3±0.9
Paper 40 15 2.5±1.0 2.1±0.4 1.2±0.6 1.9±0.9
Paper 60 15 1.4±0.5 2.1±0.9 2.6±0.4 2.0±0.8
Silica gel 40 15 1.3±0.7 1.4±0.6 0.7±0.5 1.1±0.7
Silica gel 60 15 2.0±0.7 0.9±0.2 0.8±0.1 1.2±0.7
Silica gel 80 15 1.6±0.7 1.3±0.6 0.8±0.4 1.3±0.7
Glass plate 15 1.5±0.7 0.52±0.2 0.3±0.1 0.8±0.6
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