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


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


  1. P. Gle, E. Gourdon & L. Arnaud. (2011). Acoustical properties of materials made of vegetable particles with several scales of porosity. Appl. Acoust. 72, 249-259. DOI : 10.1016/j.apacoust.2010.11.003
  2. F. Asdrubali, S. Schiavoni & K. V. Horoshenkov. (2012). A review of sustainable materials for acoustic applications. Build. Acoust, 19(4), 283-312. DOI : 10.1260/1351-010X.19.4.283
  3. G. Iannace, L. Maffei & P. Trematerra. (2012). On the use of green materials for the acoustic correction of classrooms. In Proceedings of EURONOISE (pp. 89-94). DOI : 10.5755/j01.sace.3.4.4708
  4. G. S. Gil, S. B. Lee, J. G. Jeon, K. H. Cho & Y. H. Jo. (2018). Acquisition the Property of Cushioning Material with the Drop Test and Verification with Finite Element Shock Analysis. Trans. Korean Soc. Noise Vib. Eng, 28(5), 526-533. DOI : 10.5050/KSNVE.2018.28.5.526
  5. J. Schellenberg & M. Wallis. (2010). Dependence of Thermal properties of expandable polystyrene particle foam on cell size and density. J Cell Plast, 46, 209-22. DOI : 10.1177/0021955X09350803
  6. H. E. Naguib, C. B. Park & N. Reichelt. (2004). Fundamental foaming mechanisms governing the volume expansion of extruded polypropylene foams. Journal of applied polymer science, 91(4), 2661-2668. DOI : 10.1002/app.13448
  7. Y. Guo, N. Hossieny, R. K. M. Chu, C. B. Park & N. Zhou. (2013). Critical processing parameters for foamed bead manufacturing in a lab-scale autoclave system. Chemical engineering journal, 214, 180-188. DOI : 10.1016/j.cej.2012.10.043
  8. D. Rapsa, N. Hossieny, C. B. Park & V. Altstadta. (2015). Past and present developments in polymer bead foams and bead foaming technology. Polymer, 56, 5-19. DOI : 10.1016/j.polymer.2014.10.078
  9. D. W. Jung, J. H. Jeong, C. B. Park & B. S. Shin. (2013). UV Laser Aided Micro-Cell Opening of EPP Foam for Improvement of Sound Absorption. International Journal of Precision Engineering and Manufacturing, 14(7), 1127-1131. DOI : 10.1007/s12541-013-0153-4
  10. D. W. Jung, E. K Lee & C. B. Park. (2011). Study on properties of EPP bead foam. Transactions of the Korean Society of Mechanical Engineers A, 35(9), 991-997. DOI : 10.3795/KSME-A.2011.35.9.991
  11. J. Y. Oh & B. S. Shin. (2007). Photothermal and Photochemical Investigation on Laser Ablation of the Polyimide by 355 nm UV Laser Processing. Journal of the Korean Society for precision Engineering, 24(4), 147-152. DOI : 10.1016/j.microrel.2006.01.013
  12. J. Y. Oh & B. S. Shin. (2007). A Study on Laser Ablation of Copper Thin Foil by 355 nm UV Laser Processing. Journal of the Korean Society for Precision Engineering, 24(2), 134-139. DOI : 10.7735/ksmte.2012.21.5.773
  13. J. Y. Oh, B. S. Shin, J. H. Lee, S. H. Park, & C. B. Park. (2012). A Fundamental Study on UV Laser Micro Machining of Micro Porous Polymeric Foams using Laser. Journal of the Korean Society for Precision Engineering, 29(5), 572-577. DOI : 10.7735/ksmte.2012.21.5.773
  14. J. M. Yon, J. H. Lee, D. H. Kim & O. K. Lee. (2016). Influence of stress and pure tone audiometry on noise-exposeddental laboratory technicians by dental instrument. Journal of Digital Convergence, 14(4), 363-370. DOI : 10.14400/JDC.2016.14.4.363
  15. M. S. Choi & D. H. Ji. (2009). A Study on the Dental Hygienists' Reactions to Noise When Occurred in Dental Clinic. Journal of Dental Hygiene Science, 9(4), 453-459.
  16. H. L. Jang, A. Y. Jeong & J. S. Kim. (2017). Establishment of Regulatory Standards for Noise in a High-Noise Workshop using Acoustic Psychological Analysis. J. of the Korean Society for Environmental Technology, 18(6), 526-534.
  17. J. S. Kim. (2016). The Characteristics of Noise Generated at High Noise Workshop. J. of Korean Society of Environmental Technology, 17(4), 362-370.