Dental erosion is a non-carious lesion that causes progressive tooth wear of structure through chemical processes that do
not involve bacterial action. Its origin is related to eating habits or systemic diseases involving tooth contact with
substances that pose a very low pH. This work demonstrates a new methodology to quantify the erosion by coherent light
scattering of tooth surface. This technique shows a correlation between acid etch duration and laser speckle contrast map
(LASCA). The experimental groups presented a relative contrast between eroded and sound tissue of 17.8(45)%, 23.4
(68)% 39.2 (40)% and 44.3 (30)%, for 10 min, 20 min, 30 min and 40 min of acid etching, respectively.
The pressure measured in the intervertebral discs is a response to the loads acting on the spine. External loads, such as the reaction forces resulting from locomotion, manual handling and collisions are probably the most relevant in studying spine trauma. However, the physiological functions such as breathing and hearth rate also participate in subtle variations of intradiscal pressure that can be observed only in vivo at resting. Present work is an effort to measure the effect of breathing on intradiscal pressure of an anesthetized sheep.