Dual wavelength spectrophotometry
Ø This method measures oxygenation changes in capillary bed rather than in supply vessels & hence is independent of pulsatile flow.
Ø It is useful in pulp tissue as there are arterioles rather than arteries in pulp ,encapsulated in firm dentin , making it difficult to detect pulse in pulp space.
Ø DWLS detects the presence or absence of oxygenayed blood at 760 & 850nm
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