Probe Angulation

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Probe angulation Few studies have assessed the effect of the probe angulation on the results of LDF. A study by Odor TM et al (1996) reported that probe angulation did not affect the pattern of light transmission within the tooth. 107 Probe position Hartmann A. et al. (1996) have noted higher Flux values being obtained from vital teeth as the probe was moved closer to the gingival margin, but moving the probe closer to this area may increase the possibility of including nonpulpal signals from the periodontal tissues. Akpinar al. (2004) placed the probe on the cervical third of tooth crown, taking the crown sizes of the teeth into account. One reason for this sampling site is that the output signal for transmitted laser light is minimal…show more content…
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. Signal contamination may arise from the blood flow in the palatal or the buccal gingiva. Akpinar K.E. et al. (2004) evaluated the effect of labial and palatinal gingiva on laser doppler pulpal blood flow measurements. They collected measurements without any gingival covering, and under three conditions: after application of an opaque paste on the labial gingiva, the palatal gingiva, or both the labial and palatal gingiva. The measurement values decreased 46% when there was opaque paste on labial gingiva, 10% on palatinal gingiva, and 63% on both. The decrease in the values when there was an opaque paste on palatinal gingiva was not statistically significant (p > 0.05). They concluded that, in the PBF measurements, the contribution of labial gingiva to signal is more than that of palatial gingiva. Furthermore, the use of an opaque periodontal paste that is easy to apply, in combination with a rigid splint, increases the accuracy of PBF

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