TECHNICAL DESCRIPTION

 

This invention concerns new and biocompatible inorganic cement (OP3), for treatment and sealing of dental root canal after pulp removal. As its competitors, this cement can be easily spinned into the canal with a lentulo spiral and is radio-opaque as requested by norms. This cement presents also some major advantages over products actually marketed for these indications.

Compared with calcium hydroxide-based pastes or cements

it has the same antimicrobial effect

it releases strontium besides calcium ions for better apical plug induction,

it hardens in situ and is expansive (definitive material and not only temporary).

Compared with zinc oxide-eugenol-based cements (ZOE)

besides instantaneous antimicrobial activity, it presents also a long term antimicrobial activity;

It could also be used for treatment of periapical lesions;

Its expansion properties allow better sealing water tightness without necessarily resorting to gutta-percha points.

CEMENT CHARACTERISTICS

-Initial setting time at 37°C (standard NF EN ISO 6876, Vicat needle 2 mm in diameter and 100g  mass) = 12 min

-Final setting time at 37°C (Vicat needle 1 mm in diameter and 400 g mass) = 16 min

-Compressive strength (cylindrical samples 4 mm diameter, 6 mm height) at 1 day = 2-3 MPa 

-Film thickness < 50 µm (standard NF EN ISO 6876)

-Warping > 20 mm (NF EN ISO 6876)

-Working time = 8 ± 1 min (NF EN ISO 6876)

-Time during which the paste well attaches the lentulo » 10 min

-Radio-opacity equivalent to 3,2- 5 mm Aluminium

-Removing: with an ultrasonic instrument.

BENEFITS

An instantaneous and long term antimicrobial effect:

Due to diffusion of hydroxyl ions ( OH-) through dentinal tubules

Efficiency of long term antimicrobial activity