Product description


Retroplast   -   a resin composite  for retrograde sealing of roots

Retroplast is a radiopaque, two-component chemical curing composite, which has been developed specially for retrograde endodontic sealing of roots. The product is used after pretreatment with a dentin bonding system. The polymerization time after mixing is  2 - 3  minutes.

Retroplast has been developed in close collaboration between clinicians and  dental material laboratories. Thousands of operations with Retroplast over the last 20 years show an impressive success rate.

Tight, gap-free contact between Retroplast and root-dentin

Resin composite will contract during polymerisation and, especially in box shaped cavities, this contraction may pull the material away from the cavity walls resulting in gaps. To prevent contraction gaps, the Retroplast is placed on a flat or slightly hollowed resection of the root, treated with a dentin bonding agent. The contraction of the Retroplast will then take place only as a depression of the free surface leading to absence of gaps. Retroplast will seal root canals, apical deltas, anastomosis between root canals, accessory and lateral canals, as well as infractions and exposed dentin tubules.

Section of filling and tooth.

Composite without gaps. In addition, the design

increases the possibility to seal both primary and secondary canals.

Section through filling and adjacent tissue

from a restored tooth after few months in


Newly formed tissue, apparently normal,

is seen in close contact to the polymerised


Etching and dentin bonding

Etching with an Na-EDTA-gel 0,5 M followed by an application of GLUMA® Desensitizer (Heraeus Kulzer G.m.b.H., Werheim, Germany) as bonding agent has been used as pretreatment before application of Retroplast since the introduction of the product. Applied on exposed dentin, Gluma Desensitizer will act as a disinfectant and furthermore obliterate the dentinal tubules and thereby block bacterial flow before sealing with Retroplast.

Application of Retroplast

Retroplast is flowable which secures a tight contact with the resected root-end. It is applied accurately in small quantities using the smallest excavators as carriers in order to secure correct placement. In addition of being flowable, Retroplast is tixotropic to preventing flowing of the material when placed on a vertical positioned surface. 

The working time after mixing is between 1½ and 2 minutes.


Radiolucency provided by Ytterbiumtrifluoride content, corresponds to 3-6 mm Al, is necessary for later observation of the healing result. Radiolucency allows observation of surplus, is helpful for the diagnosis in the few cases where a seal becomes loose and permits monitoring of previous root treatments.

Stability of Gluma Desensitizer-Retroplast seals

The stability of Gluma Desensitizer-Retroplast seals is confirmed in studies with observation periods longer than 10 years. For uncomplicated cases, a success rate about 90% has been observed. Retroplast is biocompatible. Histological examinations of apical tissues from monkeys reveal normal tissue formation close to the seal.

Reformation of an apical periodontal membrane

It is important to avoid covering of the periodontal ligament space with Retroplast. If the ligaments are free, root-cement will grow covering the Retroplast seal. This is how apical periodontal ligament space is formed, including formation of Sharpey's fibres.


Retroplast Trading recognizes its responsibility to replace products with proven deficiency. Retroplast Trading does not accept liability for any damages or loss, either direct or consequential, stemming from the use of or inability to use the products as described. Before using, it is the responsibility of the user to determine the suitability of the product for its intended use. The user assumes all risk and liability in connection therewith.