Mechanical Properties of Polylactic Acid Composites and Root Dentin of Primary Anterior Teeth

doi:10.13701/j.cnki.kqyxyj.2021.02.011

Abstract

Abstract: Objective: To test the mechanical properties of different proportions of polylactic acid/hydroxyapatite (PLLA/HA) composites and root dentin of primary anterior teeth. Methods: PLLA/HA composites with different proportions were prepared by melt blending method. PLLA/HA composites were divided into PLLA, PLLA-1%HA, PLLA-3%HA, PLLA-5%HA, and PLLA-7%HA groups according to different HA mass percentages. The tensile and flexural properties were tested by electronic universal tester, and the impact strength of the composites was tested by pendulum impact tester. 16 primary anterior teeth were collected in vitro, and the compressive modulus and strength of root dentin were tested. Results: There was no significant difference in flexural modulus and impact strength among the five groups (P>0.05), but there were significant differences in tensile strength and flexural strength (P<0.05). The tensile strength and flexural strength of PLLA/HA composites in PLLA-1%HA, PLLA-3%HA, and PLLA-5%HA groups were lower than those in PLLA group, but there was no significant difference among three groups (P>0.05). The mean compressive modulus and strength of the root dentin were 3.63 GPa and 128.03 MPa, respectively. Conclusion: PLLA-1%HA, PLLA-3%HA, and PLLA-5%HA composites are expected to be the materials of root canal post in primary teeth due to the certain mechanical properties, but their mechanical properties need to be further improved.

Key words: polylactic acid, hydroxyapatite, root dentin, root canal post of primary teeth, mechanical properties

GAO Li, WANG Rui, ZHANG Hui, LIU Wentao, MA Ning. Mechanical Properties of Polylactic Acid Composites and Root Dentin of Primary Anterior Teeth[J]. Journal of Oral Science Research, 2021, 37(2): 139-143.

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