Duplicate complete dentures made by general digital devices: Evaluation of material properties and clinical trial

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  • Kurahashi Kosuke
    Department of Oral and Maxillofacial Prosthodontics, Tokushima University Graduate School of Biomedical Sciences
  • Iwawaki Yuki
    Department of Oral and Maxillofacial Prosthodontics, Tokushima University Graduate School of Biomedical Sciences
  • Matsuda Takashi
    Department of Oral and Maxillofacial Prosthodontics, Tokushima University Graduate School of Biomedical Sciences
  • Goto Takaharu
    Department of Oral and Maxillofacial Prosthodontics, Tokushima University Graduate School of Biomedical Sciences
  • Ishida Yuichi
    Department of Oral and Maxillofacial Prosthodontics, Tokushima University Graduate School of Biomedical Sciences
  • Ito Teruaki
    Tokushima University Graduate School of Technology, Industrial and Social Sciences
  • Ichikawa Tetsuo
    Department of Oral and Maxillofacial Prosthodontics, Tokushima University Graduate School of Biomedical Sciences

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Other Title
  • 汎用デジタル機器を用いて製作した複製義歯：材料特性と臨床評価
  • ハンヨウ デジタル キキ オ モチイテ セイサク シタ フクセイ ギシ : ザイリョウ トクセイ ト リンショウ ヒョウカ

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<p>Purpose: The purpose of this study was to investigate the validity of the process of duplicating complete dentures using general digital devices through the following tests: cytotoxicity test of materials used, adhesion test of materials to a silicone impression material and a self-curing resin, and questionnaires to operators on duplicate dentures in clinical situations.</p><p>Methods: The cell viability of mouse fibroblast-like cells in acrylonitrile- butadiene-styrene (ABS) and polylactic acid (PLA) were evaluated as a cytotoxicity test. The tensile strength between the silicone impression material/self-curing resin and ABS/PLA specimen was measured as adhesive strength using a universal testing machine. Six practitioners who used duplicate PLA complete dentures in 7 patients were asked to evaluate the duplicate denture using the original questionnaire.</p><p>Results: The cytotoxicity test showed that the cell viabilities in ABS and PLA were similar to that in acrylic resin at the cell culture times of 24, 48 and 72 hours. The adhesion test showed that the adhesive strength between the ABS/PLA and silicone impression material was significantly lower than that between the conventional self-curing resin and silicone impression material. Although the adhesive strength between the PLA and self-curing resin was low, there was no significant difference between the ABS and self-curing resin. The results of the questionnaire showed that the duplicate denture made of PLA would be of similar value compared to the conventional duplicate denture made of acrylic resin.</p><p>Conclusions: The present study suggests that the duplicate complete dentures made by our proposed digital process are clinically effective.</p>

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