Restorative procedures implemented by the dental management of caries
, fractures and loss of teeth may not be done without injury pulp. It is primarily the cutting action, which cause irritation of the tooth pulp, releasing the frictional heat using rotary tools. Because the thermal conductivity of the dentin is low, mainly lips that harm. Critical to this effect is insufficient water for irrigation (Fig. 2.15). Direct heat injury, as a rule, does not arise, if the procedure is performed far from the pulp. In addition, the frequent beating tooth incorrectly center tools can cause traumatic effects. All of these injuries produce neurovascular responses nature similar to those described above.
Preparation of injury rotary instruments is likely to injure odontoblast layer (71). Due to dehydration tubular content odontoblasts may even be involved in the dentinal tubules. This special effect is called odontoblast aspiration can be observed in tissue sections presence of their nuclear activities within the dentinal tubules.
Injury when preparing injury odontoblast layer opens the way for peripherally directional flow of tissue fluid along the tubules.
The fluid flow is possible due to the higher tissue pressure in flesh, than outside. In normal conditions it is 5-10 mm RT. senior above, in the pulp and paper (26). This corresponds quite well with the local blood pressure. Under the inflammation of the pulp t question, the pressure increases. On the contrary, it may be reduced during the flight-and-fight reaction, perception and use of anesthetic solution contains a vasoconstrictor (60).