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Fundamental study on sound absorption of a dental hand piece using micro-porous EPP substrate processed by UV laser

UV 레이저응용 마이크로 다공성 EPP 기판의 치과용 핸드피스 흡음성능에 관한 기초연구

  • You, Dong-Bin (Department of Cogno-mechatronics engineering, Pusan National University) ;
  • Shin, Myung-Ho (School of Mechanical Engineering, Pusan National University) ;
  • Byun, Hyo-Jin (School of Mechanical Engineering, Pusan National University) ;
  • Choi, Do-Jung (School of Mechanical Engineering, Pusan National University) ;
  • Sung, Kuo-Won (REACH dental clinic) ;
  • Ma, Yong-Won (Interdisciplinary Department for Advanced Innovative Manufacturing Engineering, Pusan National University) ;
  • Shin, Bo-Sung (Department of Optics and Mechatronics Engineering, Pusan National University)
  • 유동빈 (부산대학교 인지메카트로닉스공학과) ;
  • 신명호 (부산대학교 기계공학부) ;
  • 변효진 (부산대학교 기계공학부) ;
  • 최도정 (부산대학교 기계공학부) ;
  • 성규원 (리치 치과) ;
  • 마용원 (부산대학교 첨단혁신제조협동과정) ;
  • 신보성 (부산대학교 광메카트로닉스 공학과)
  • Received : 2019.03.18
  • Accepted : 2019.05.20
  • Published : 2019.05.28

Abstract

Recently many studies to reduce the noise of dental hand piece which generate inevitably mechanical sound to offend to the ear of a patient have been spotlighted. Generally, methods of adding a sound absorbing material inside the exhaust valve, air pump of machine or automobile are widely reported as optimal way to reduce the mechanical noise. In this paper we studied a new UV laser aided manufacturing of micro-porous structure of EPP substrate and applied dental hand piece to improve the efficiency of sound absorption. A lot of micro-sized pores were fabricated with UV laser processing on the surface of sliced EPP substrate. From fundamental experiments, more high-performance of micro-porous EPP substrate has finally demonstrated for sound-absorbing structure of the micro muffler inside dental hand piece, which actually has the excellent potential to apply a lot of potable machine.

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Fig. 1. SEM photographs of EPP beads withdifferent expansion ratio(a : X 15, b : X 30, c: X 45)

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Fig. 2. Frequency response of PP samples of at HF Range

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Fig. 3. Schematic of dental hand piece and its operating principle

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Fig. 4. UV laser aided micro-cell opened EPP Foam

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Fig. 5. Comparison of SEM images with (a) original EPP foam and (b) cell-opened EPP foam

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Fig. 6. Micro muffler

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Fig. 7. Sound absorption test for a hand piece with micro muffler

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Fig. 8. Comparison graph of experimental data

Table 1. Experimental data of sound absorption test

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Acknowledgement

Supported by : Institute for Information & communications Technology Promotion(IITP), Korea Institute for Advancement of Technology(KIAT), Ministry of Trade, Industry &Energy (MOTIE)

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