Scholarlink

<p>The present study reports the development of Novel Tooth colored dental brackets in net shape out of alumina ceramic, adopting micro-ceramic injection molding technique. The brackets are developed from alpha alumina powder having 0.3-0.4&#xa0;µm average particle size, with the help of an inorganic binder system consisting of high-density polyethylene and paraffin wax. Multi-cavity micro-injection mold is used to manufacture green compact of brackets, wherefrom eight brackets of similar or different dimensional details can be manufactured from one injection shot. Mold filling simulations are performed to optimize the die geometry as well as injection conditions of bracket development, in line with the Taguchi l9 orthogonal experimental design. After injection molding, green compacts are debound using one step thermal debinding technique and then finally sintered at 1600&#xa0;°C to develop alumina dental brackets in net shape with average density of approx. 3.8gm/cc (98% of theoretical density of alumina). The sintered, polycrystalline alumina brackets show bimodal grain structure having grain sizes ranging between 0.8 and 2&#xa0;µm, minimum presence of microporosity as well as adequate hardness, surface finish, bio compatibility, and fracture toughness. Moreover, the sintered white colored alumina brackets attain tooth colored appearance under exposure to the daily consumable beverages like tea, coffee, coke, etc. for approx. 72&#xa0;hours, as evidenced in the colorimetric study.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Development of Novel Tooth Colored Micro-Ceramic Injection Molded Alumina Orthodontic Brackets

  • 期刊论文

  • 发表日期：

    2024年12月31日

查看全文
  • Prosenjit Das,
  • Astik Kumar,
  • Adrika Maji

摘要

The present study reports the development of Novel Tooth colored dental brackets in net shape out of alumina ceramic, adopting micro-ceramic injection molding technique. The brackets are developed from alpha alumina powder having 0.3-0.4 µm average particle size, with the help of an inorganic binder system consisting of high-density polyethylene and paraffin wax. Multi-cavity micro-injection mold is used to manufacture green compact of brackets, wherefrom eight brackets of similar or different dimensional details can be manufactured from one injection shot. Mold filling simulations are performed to optimize the die geometry as well as injection conditions of bracket development, in line with the Taguchi l9 orthogonal experimental design. After injection molding, green compacts are debound using one step thermal debinding technique and then finally sintered at 1600 °C to develop alumina dental brackets in net shape with average density of approx. 3.8gm/cc (98% of theoretical density of alumina). The sintered, polycrystalline alumina brackets show bimodal grain structure having grain sizes ranging between 0.8 and 2 µm, minimum presence of microporosity as well as adequate hardness, surface finish, bio compatibility, and fracture toughness. Moreover, the sintered white colored alumina brackets attain tooth colored appearance under exposure to the daily consumable beverages like tea, coffee, coke, etc. for approx. 72 hours, as evidenced in the colorimetric study.