Rapid heat-cured acrylic resin has the highest linear shrinkage at 0.97%, which can affect the fit and stability of the denture.

The distance between the tip of the curing light and the tooth is important, as the intensity  of the light source is important. A minimum of 400-mW/cm2 is required. It is recommended that the tip be placed as close to the surface to be cured as is physically possible (within 1 to 2mm).

The intensity of light is inverselyproportional to the distance from the source. As a general rule each increment should be at most 1.5 to 2 mm thick. This will ensure complete penetration of the light and maximum curing of thecomposite at the bottom most portion of the cavity preparation.

Electronic devices are contraindicated in patients with pacemakers.

The success of a root canal filling is primarily assessed through clinical observation, which includes monitoring for signs of pain, swelling, and infection. While radiographs and the size of the gutta-percha cone used can provide additional information, the ultimate determinant of success is the patient's symptom resolution and the absence of pathology.

The role of sodium metabisulfite in local anaesthetic agent is as a preservative.