Measurement of facial blood flow with laser doppler flowmeter. II. Alteration of facial blood flow by position change.

Shimazaki, Toshiharu; Shimada, Jun; Okitsu, Mitsuhisa; Hiranuma, Y; Eba, Mitsuyoshi; Sakamoto, E; Yamamoto, Yoshiro

doi:10.5794/jjoms.35.2848

Cited by 3 publications

(5 citation statements)

References 2 publications

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“…However, the significantly higher pulp perfusion found in the first few minutes following movement to the supine position indicates that the equilibration of the sys temic circulation takes some time to be completed. These results are in agreement with the results of other investiga tors [17,18] who reported increases in oral mucosal blood perfusion after subjects changed from a sitting to a supine position and decreases in laser-Doppler flux after a change from supine to upright body posture.…”

Section: Discussionsupporting

confidence: 83%

Measurement of Blood Perfusion in the Dental Pulp with Laser Doppler Flowmetry

Firestone

Wheatley²,

Thüer³

1997

Int J Microcirc

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The reproducibility of laser Doppler flowmetry (LDF) in measuring the perfusion of the dental pulp was investigated. A second aim was to establish if the LDF signal from the dental pulp can be influenced by physiological stimuli, e.g. postural changes. A third aim was to apply the technique to clinical measurements of pulp perfusion in patients undergoing orthodontic therapy. A custom splint to position the probe was fabricated for 10 subjects, and measurements of pulpal perfusion in the maxillary six anterior teeth were repeated on eight occasions with the subject seated. Further, measurements of the dental pulp perfusion in one tooth were repeated with the subject in a standing and supine position. Mean perfusion (arbitrary perfusion units) for individual teeth varied from 2.7 for a central incisor to 15.5 for a lateral incisor. Perfusion was greatest for lateral incisors and least for central incisors. Pulpal perfusion was significantly higher in a supine than in a standing or sitting position. Initial clinical experience with LDF encourages further investigation of its potential as a diagnostic tool for determining pulp vitality. Preliminary experimental results suggest that LDF will be a valuable source indicating pulpal response to orthodontic therapy with fixed appliances.

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Section: Discussionsupporting

confidence: 83%

Measurement of Blood Perfusion in the Dental Pulp with Laser Doppler Flowmetry

Firestone

Wheatley²,

Thüer³

1997

Int J Microcirc

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“…Previous investigations using LDF demonstrated a variety of factors that can have impact on accuracy of PBF measurements, such as patient position and resting state, room temperature and the location of the measurement probe (Shimazaki et al . , Öberg , Ramsay et al . , Firestone et al .…”

Section: Discussionmentioning

confidence: 99%

“…Some of the main causes for the low acceptance of LDF in the dental community are economics and issues related to the design of the laser probe holder, the influence of the recording site and tooth isolation (Hartmann et al 1996). Previous investigations using LDF demonstrated a variety of factors that can have impact on accuracy of PBF measurements, such as patient position and resting state, room temperature and the location of the measurement probe (Shimazaki et al 1989, Ö berg 1990, Ramsay et al 1991, Firestone et al 1997. Signal contamination may arise from the blood flow in the palatal or the buccal gingiva (Amess et al 1993).…”

Section: Discussionmentioning

confidence: 99%

Effect of tooth isolation on laser Doppler readings

et al. 2012

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“…1995), the temperature of the environment, the position and the resting status of the patient, the position of the probe (Edwall et al. 1987, Shimazaki et al. 1989, Oberg 1990, Ramsay et al.…”

Section: Factors Influencing the Resultsmentioning

confidence: 99%

“…The LDF assessment of PBF may be highly susceptible to environmental and technique-related factors. Variables such as probe design (Ingólfsson et al 1993, Hartmann et al 1996, probe holder characteristics , Wilder-Smith 1988, Ramsay et al 1991b, McDonald & Pitt Ford 1994, Hartmann et al 1996, Musselwhite et al 1997, gingival isolation devices (Hartmann et al 1996, Vongsavan & Matthews 1996, Soo-ampon et al 2003, 2005b, flowmeter characteristics (Ingólfsson et al 1994b, Hartmann et al 1996, Odor et al 1996a,c, Roebuck et al 2000, mineralization of enamel and dentine (Vaarkamp et al 1995), the temperature of the environment, the position and the resting status of the patient, the position of the probe (Edwall et al 1987, Shimazaki et al 1989, Oberg 1990, Ramsay et al 1991b, Ingólfsson et al 1994b, Hartmann et al 1996, Odor et al 1996b), heartbeat-synchronous oscillations, tooth discolouration, stress, intake of drugs, agerelated changes, etc, may significantly influence LDF results (Okabe et al 1989, Olgart et al 1989, Heithersay & Hirsch 1993, Matthews & Vongsavan 1993, Chng et al 1996, Musselwhite et al 1997, Verdickt & Abbott 2001, Ikawa et al 2003. These factors can be categorized as below.…”

Section: Factors Influencing the Resultsmentioning

confidence: 99%

Laser Doppler flowmetry in endodontics: a review

Jafarzadeh

2009

Int Endodontic J

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Vascular supply is the most accurate marker of pulp vitality. Tests for assessing vascular supply that rely on the passage of light through a tooth have been considered as possible methods for detecting pulp vitality. Laser Doppler flowmetry (LDF), which is a noninvasive, objective, painless, semi-quantitative method, has been shown to be reliable for measuring pulpal blood flow. The relevant literature on LDF in the context of endodontics up to March 2008 was reviewed using PubMed and MEDLINE database searches. This search identified papers published between June 1983 and March 2008. Laser light is transmitted to the pulp by means of a fibre optic probe. Scattered light from moving red blood cells will be frequency-shifted whilst that from the static tissue remains unshifted. The reflected light, composed of Doppler-shifted and unshifted light, is returned by afferent fibres and a signal is produced. This technique has been successfully employed for estimating pulpal vitality in adults and children, differential diagnosis of apical radiolucencies (on the basis of pulp vitality), examining the reactions to pharmacological agents or electrical and thermal stimulation, and monitoring of pulpal responses to orthodontic procedures and traumatic injuries. Assessments may be highly susceptible to environmental and technique-related factors. Nonpulpal signals, principally from periodontal blood flow, may contaminate the signal. Because this test produces no noxious stimuli, apprehensive or distressed patients accept it more readily than current methods of pulp vitality assessment. A review of the literature and a discussion of the application of this system in endodontics are presented.

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Measurement of facial blood flow with laser doppler flowmeter. II. Alteration of facial blood flow by position change.

Cited by 3 publications

References 2 publications

Measurement of Blood Perfusion in the Dental Pulp with Laser Doppler Flowmetry

Measurement of Blood Perfusion in the Dental Pulp with Laser Doppler Flowmetry

Effect of tooth isolation on laser Doppler readings

Laser Doppler flowmetry in endodontics: a review

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