Flowable Urethane Dimethacrylate-Based Filler for Root Canal Obturation in Primary Molars: A Pilot SEM and microCT Assessment.

Saulius Drukteinis,Luc C Martens,Lesbia Drukteinis,Audra Drukteiniene,Sivaprakash Rajasekharan

doi:10.3390/children8020060

Abstract

Pulpectomy in deciduous teeth involves endodontic access opening, root canal debridement and obturation with an appropriate filling material. EndoREZ (ER) is the urethane dimethacrylate-based filler, which can be used for root canal obturation in permanent and primary teeth. This observation aimed to evaluate the behavior of the ER as a filler in root canals of two primary molars after the physiological resorption process using the scanning electron microscopy (SEM) and micro-computed tomography (µCT) in second lower molars after their natural exfoliation. The SEM analysis revealed a non-uniform, porous and lacunary structure of ER, visually similar to the resorbed surface of the dentine. The µCT observations demonstrated the differences in the resorption level of the root and material surfaces. The preliminary observations suggest that ER is resorbed faster than root tissues and can therefore be a suitable material for the root canal filling in primary teeth. However, more investigations are needed to support these preliminary findings.

Highlights

The recent micro-computed tomographic studies discovered the complexity and anatomical diversity of the roots and root canals in primary teeth [1], making the endodontic treatment very challenging for the clinicians
Vital pulp therapy in primary teeth relies on pulpotomy procedures, including the recent use of hydraulic calcium silicate-based materials [4]
That pulpectomy outcomes differs significantly due to the material used for root canal filling: the lowest rates were detected when calcium hydroxide paste was used, while better rates were associated with iodoform, zinc oxide-iodoform or zinc oxide-eugenol formulations [17,18]

Summary

Introduction

The recent micro-computed tomographic (μCT) studies discovered the complexity and anatomical diversity of the roots and root canals in primary teeth [1], making the endodontic treatment very challenging for the clinicians. The ideal root canal filling material for primary teeth should be resorbable and have no effect on the physiological root resorption [7] It should be antibacterial and biocompatible while not having any harmful effect on the permanent tooth germ ifaenxdtrbuidoceodmpperaitaipbliecawllyhi[l8e].nToht ehawvhinoglearnayngheaormf pfuaslteef-fteycpteomn athteeripaelsrmwaansesnutgt-ooth germ if gested for roeoxttrcuadnaedl fpilelirniagpiincapllryim[8a]r.yThteeetwhh, osulechraansgezionfcpoaxsitdee-t-yepuegemnaotle(rZiaOlsEw),acsaslcuigugmested for root hydroxide wciathnaolrfiwlliitnhgoiuntpioridmoaforyrmte,eitohd, osufocrhmasbazisnecdoaxniddeo-ethuegresn. The material appeared deeper in the canal, demonstrating the different resorption levels of the ER and root dentine surfaces. Despite the oblique resorption nature and different resorption intensity for M and D roots (Figure 4B), the same predominance of more extensive ER material resorption over root structures was observed

Findings

Discussion

Conclusions