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About Retroplast


The history of Retroplast

Retroplast was developed in 1984 by Cand. scient Erik Christian Munksgaard at the Dental School in Copenhagen together with dentist Jørgen Rud.  


From its inception, Retroplast has been produced in Denmark and predominantly utilized by Danish dentists. What sets Retroplast apart from other retrograde root filling materials is its foundation in adhesive technology, eliminating the necessity for a pre-prepared cavity for material application. This advantageous feature allows for the effective sealing of teeth with long posts or parietal perforations using Retroplast. Consequently, Retroplast can cover all facets of endodontic surgery.


Retroplast's suitability for treating very narrow and small roots is enhanced by the absence of cavity requirements, which sets it apart from cement-based materials. This contrasts with the potential weakening of roots by a 3 mm deep preparation with ultrasonic tips, as some authors have noted. Additionally, it's worth mentioning that challenging-to-access roots, such as palatal roots on teeth 4+,+4 or 6+,+6, can be effectively treated without the need for cavity preparation.

Since it is a composite resin, the solubility is very low and Retroplast fillings have shown durability for up to 30-35 years after surgery.

The method can be initiated without the need for any specialized equipment. All that's necessary is a minor hollowing of the desired root to be sealed using a large rose drill. While an ultrasonic device is not mandatory, the procedure can be carried out visually without magnification, though it is advisable to utilize magnifying glasses or a microscope for enhanced visibility and superior outcomes.

Research on Retroplast has consistently demonstrated success rates of up to 90%, comparable to those of MTA, as documented in numerous articles over time.


See an overview of these below:

  1. MUNKSGAARD EC, RUD J, Asmussen E: Retrograde root filling with plastic and dentin binder. I. Adaptation and bond strength. The Dental Journal 1989;93:157-160.

  2. ANDREASEN JO, RUD J, MUNKSGAARD EC: Retrograde root filling with plastic and dentin binder. II. Preliminary histological studies of tissue reactions in monkeys. The Dental Journal 1989;93:195-197.

  3. RUD J, RUD V, MUNKSGAARD EC: Retrograde root filling with plastic and dentin binder. III. Indication and possible uses. The Dental Journal 1989;93:223-229.

  4. RUD J , ANDREASEN JO, RUD V: Retrograde root filling with plastic and dentin binder. IV. Healing rate compared to retrograde amalgam. The Dental Journal 1989;93:267-273.

  5. RUD J, MUNKSGAARD EC: Retrograde root filling with plastic and dentin binder. V. Analysis of failed cases. The Dental Journal 1989;93:343-350.

  6. RUD J, RUD V, MUNKSGAARD EC: Retrograde root filling with plastic and dentin binder. WE. Surgical technique. The Dental Journal 1989;93:401-405.

  7. RUD J, MUNKSGAARD EC, RUD V: Retrograde root filling with dentin binder and plastic. In: Odontologi 90' (E. Hjørting-Hansen, Ed.) Munksgaard, Copenhagen 1990, pp 141-153.

  8. RUD J, MUNKSGAARD EC, ANDREASEN JO, RUD V, ASMUSSEN E: Retrograde root filling with composite and a dentin bonding agent I. Endod Dent Traumatol.1991; 7: 118–125.

  9. RUD J, MUNKSGAARD EC, ANDREASEN JO, RUD V: Retrograde root filling with composite and a dentin bonding agent II. Endod Dent Traumatol. 1991;7:126-131.

  10. AMBUS C, MUNKSGAARD EC: Dentin bonding agents for retrograde filling. Am J Dent 1993;6:35-38.

  11. ANDREASEN JO, MUNKSGAARD EC, FREDEBO L, RUD J: Periodontal tissue regeneration including cementogenesis adjacent to dentin bonded retrograde composite fillings in humans. J Endodon 1993;19:151-153.

  12. RUD J, RUD V, MUNKSGAARD EC: Long term evaluation of retrograde root filling with dentin-bonded resin composites. J Endodon 1996;22:90-93.

  13. RUD J, RUD V, MUNKSGAARD EC: Retrograde root filling with dentin-bonded modified resin composite. J Endodon 1996;22:477-480.

  14. RUD J, RUD V, MUNKSGAARD EC: Effect of root canal contents on healing of teeth with dentin-bonded resin composite retrograde seal. J Endodon. 1997;23:535-541. 

  15. RUD J, RUD V: Surgical endodontics of upper molars: Relation to the maxillary sinus and operation in acute state of infection. J Endod 1998;24:260-261.

  16. RUD J, RUD V, MUNKSGAARD EC: Retrograde sealing of accidental root perforations with dentin-bonded composite resin. J Endodon 1998;24:671-677.

  17. RUD J, RUD V, MUNKSGAARD EC: Periapical healing of mandibular molars after retrograde sealing with dentine-bonded composite. Int Endod J 2001;34:285-292.

  18. JENSEN SS, TOFT PG, SCHOU S, NATTESTAD A: Selection of material for retrograde root canal filling. A literature review. Tandlægebladet 2000;104:138-146.

  19. JENSEN SS, NATTESTAD A, EGDØ P, SEVERING I, MUNKSGAARD EC SCHOU S: A prospective, randomized, comparative study of resin composite and glass ionomer cement for retrograde root filling. Clin Oral Invest 2002;6:236-243.

  20. JENSEN SS, SCHOU S: Retrograde root filling with composite plastic or glass ionomer cement. A prospective randomized clinical trial. Tandlægebladet 2004;108:412-417.

  21. VON ARX T, JENSEN SS, HÄNNI S: Clinical and radiographic assessment of various predictors for healing outcome 1 year after periapical surgery. J Endodon 2007;33:123-128.

  22. YAZDI PM, SCHOU S, JENSEN SS, STOLTZE K, KENRAD B, SEWERIN I: Dentine-bonded resin composite (Retroplast) for root-end filling: a prospective clinical and radiographic study with a mean follow-up period of 8 years; Int Endod J 40;7:493-503

  23. VON ARX T, HÄNNI S, JENSEN SS: Apical surgery with root-end filling. Clinical results with mineral trioxide aggregate (MTA) and an adhesive resin composite (Retroplast). J Endodon 2010;36:1122-1129.

  24. VON ARX T, JENSEN SS, HÄNNI S: Five-year longitudinal assessment of the prognosis of apical microsurgery. J Endodon 2012;38:570-579.

  25. SAXENA P: Biocompatibility of root-end filling materials_ recent update   Restor Dent Endod. 2013 Aug; 38(3): 119-127

  26. VON ARX T, HÄNNI S, JENSEN SS: 5-year results comparing mineral trioxide aggregate (MTA) and adhesive resin composite (COMP) for root-end sealing in apical surgery. J Endodon 2014;40:1077-1081.

  27. VON ARX T: Die Retroplast Technique, Schweiz Monatsschr Zahnmed 2005

  28. KRAUS RD, VON ARX T, GFELLER D DUCOMMUN J, JENSEN SS: Assessment of the non-operated root after apical surgery of the other root in mandibular molars. J Endodon 2015;41:442-446.

  29. HC SEEDAT, PJ VAN DER VYVER, FA DE WET. Micro-endodontic surgery part 2. Root-end filling materials – A literature review, SADJ 2018;73:336-342

  30. FRIEDMANN, S: The prognosis and expected outcome of apical surgery. Endodontic Topics 2005. Vol 11, 219-262

  31. RUD V. MUNKSGAARD EC: Healing after retrograde root sealing of molars in the lower jaw Tandlægebladet 2002, 106, 11,  p882-888

  32. MEETUR et al. Outcome of endodontic surgery, a metaanalysis of the Literature—Part 3: Comparison of Endodontic Microsurgical Techniques with 2 Different Root-end Filling Materials. J Endodon 2018, 44, 923-931

Do you want to know more?
Scientific articles about Retroplast:

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