Machine needles with a safety spring for filling canals with pastes and cements Safety Spring Fill Needles (PFL), also known as Lentulo needles,
are instruments designed for filling canals with semi-liquid materials (paste and cement).
Their working part has the shape of an elongated cone
and is made of a loosely wound spiral made of thin wire.
The safety spring placed at the handle increases the flexibility of the needles
and protects them against breaking during rotational movements in the canal. 

The golden color of the handles allows you to quickly distinguish the needles
from other instruments.

Material is inserted only when moving to the right (clockwise),

allowable rotational speed of the contra-angle: below 800 rpm, cross-section.