IADR Abstract Archives
Strain Distribution on Heat-Polymerized, Milled and 3D-Printed Maxillary Denture Base
Objectives: This study was to evaluate the strain distribution on heat-polymerized, milled and 3D-printed maxillary denture bases. And the strain change after artificial aging by water immersion up to 28 days.
Methods: An edentulous maxillary test model with artificial gingiva 2mm in thickness was fabricated. Denture bases with 2mm even thickness were designed and fabricated by following 3 process ( 6 materials in total ): (1) heat-polymerized resin process ( injection molded, compression molded ); (2) milled process (CCM group); (3) 3D-printed process (3DP group ). Seven Strain gauges were then attached on the labial notch (Ch1) , 1st premolar(Ch2, Ch4), post-dam(Ch3) across denture midline, left buccal notch (Ch5), ridge crest around 1st premolar(Ch6) and tuberosity(Ch7) on each testing denture base. A static 50N axial load was applied on each denture base for 3 times. Mean strain values (MSV) were collected for comparison. Then denture bases was immersed in the 37 degree Celsius constant temperature water bath, the same loading procedure was applied at 14 and 28 days on each denture bases.
Results: The strain distribution of CCM group and 3DP group was similar, and the CCM group presented lesser MSV than 3DP group. Moreover, the 3DP group showed divergent result. Almost the MSVs increased in each group after 14-days water immersion. However, the MSVs decreased in each group after 28-days water immersion. The difference among each group became smaller, except 3DP group.
Conclusions: (1) Hight MSV presented in labial notch (CH1 ), post dam (CH3) and tuberosity(CH7) in each group, but 3DP group exhibits the largest strain deviation. (2) After artificial aging, CCM group had the smallest changes, followed by heat polymerized process. The 3DP group had the largest changes for 28 days.
Supported by STSP EX-03-17-29-108
Methods: An edentulous maxillary test model with artificial gingiva 2mm in thickness was fabricated. Denture bases with 2mm even thickness were designed and fabricated by following 3 process ( 6 materials in total ): (1) heat-polymerized resin process ( injection molded, compression molded ); (2) milled process (CCM group); (3) 3D-printed process (3DP group ). Seven Strain gauges were then attached on the labial notch (Ch1) , 1st premolar(Ch2, Ch4), post-dam(Ch3) across denture midline, left buccal notch (Ch5), ridge crest around 1st premolar(Ch6) and tuberosity(Ch7) on each testing denture base. A static 50N axial load was applied on each denture base for 3 times. Mean strain values (MSV) were collected for comparison. Then denture bases was immersed in the 37 degree Celsius constant temperature water bath, the same loading procedure was applied at 14 and 28 days on each denture bases.
Results: The strain distribution of CCM group and 3DP group was similar, and the CCM group presented lesser MSV than 3DP group. Moreover, the 3DP group showed divergent result. Almost the MSVs increased in each group after 14-days water immersion. However, the MSVs decreased in each group after 28-days water immersion. The difference among each group became smaller, except 3DP group.
Conclusions: (1) Hight MSV presented in labial notch (CH1 ), post dam (CH3) and tuberosity(CH7) in each group, but 3DP group exhibits the largest strain deviation. (2) After artificial aging, CCM group had the smallest changes, followed by heat polymerized process. The 3DP group had the largest changes for 28 days.
Supported by STSP EX-03-17-29-108
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