Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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The effects of gingival blood flow on pulpal blood flow detection using ultrasound Doppler flowmetry: animal study

  • Dohyun Kim (Department of Conservative Dentistry, Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Hyoung-Seok Ko (Department of Conservative Dentistry, Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Soo-Yeon Park (Department of Conservative Dentistry, Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Seung-Yeon Ryu (Department of Conservative Dentistry, Oral Science Research Center, College of Dentistry, Yonsei University) ;
  • Sung-ho Park (Department of Conservative Dentistry, Oral Science Research Center, College of Dentistry, Yonsei University)
  • Received : 2022.10.04
  • Accepted : 2022.10.27
  • Published : 2023.02.28
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Abstract

Objectives: This study evaluated the effect of adjacent gingival blood flow on detection of pulpal blood flow (PBF) using ultrasound Doppler flowmetry (UDF) through animal study. Materials and Methods: The study included 36 right and left maxillary the third incisors and canines in 9 experimental dogs. The study included 2 main steps: In the first step, the pulse sound level (PSL) was recorded on the cervical part of each tooth without flap elevation (Group 1), with flap elevation (Group 2), and after it was repositioned in place (Group 3). In the second step, the PSL was recorded on the cervical part of each tooth (Group 4), after pulpotomy (Group 5), after partial pulp extirpation (Group 6), after complete extirpation (Group 7), and after canal filling (Group 8). In Groups 5-8, the study was performed with and without flap elevation in the left and right teeth, respectively. The PSL was graded as follows: 0, inaudible; 1, heard faintly; and 2, heard well. The difference between each group was analyzed using Friedman's test with Wilcoxon signed-rank tests (α = 0.05). Results: In step 1, the PSL results were Group 1 > 2 and 3. In step 2, there was no significant difference between the groups when the flap was not elevated, while PSL results were Group 4 > 5 ≥ 6 and 7 ≥ 8 when the flap was elevated. Conclusions: PBF is affected by gingival blood flow when measured with UDF. UDF measurements require isolation of gingiva from the tooth.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT; MSIT) (No. 2020R1H1A210120011).

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