Effect of ionizing radiation on the microstructure and physical properties of endodontic gutta-percha points

Year 2024, Volume: 58 Issue: 3, 139 - 144, 20.09.2024

María Alejandra Narváez Rodríguez , Marina Vega González , Rafael Alberto Pedraza Neiza , Cesar López Cruz , León Francisco Espinosa Cristóbal , Rubén Abraham Domínguez Pérez

https://doi.org/10.26650/eor.20241355944

Abstract

Purpose: Patients undergoing radiotherapy for head or neck cancer often require root canal treatments, which can be compromised by the effects of radiation. This investigation aimed to determine whether ionizing radiation (IR), in doses similar to those used in conventional therapy, affects the surface and physicomechanical properties of various brands of endodontic gutta-percha points (EGPs).

Materials and Methods: One hundred and twenty-three EGPs from three brands (Meta-Biomed, Dentsply, and Hygenic) were divided into groups and either exposed or not exposed to IR at a total dose of 50 Gy, divided into 25 fractions. Tensile strength and microhardness tests were performed on all EGPs. Scanning electron microscopy was utilized to identify possible microstructural surface changes due to IR exposure. The proportion of organic to inorganic components in each brand was also determined.

Results: Exposure to IR resulted in significant changes only in the EGPs from the Meta-Biomed brand, including a notable decrease in tensile strength and an increase in microhardness. Furthermore, the surface microstructure of these EGPs displayed dark lines and striations over a large area, with some lines deeply embedded in the center and cavities of variable depths and extensions observed, leading to irregular and non-smooth surfaces. This brand had the highest proportion of organic components.

Conclusion: The physicomechanical properties and surface microstructure of Meta-Biomed brand EGPs were significantly affected by IR at doses used in conventional therapy for head or neck cancer, while the other brands were less affected or unaffected.

Keywords

radiotherapy, endodontic gutta-percha points, microstructure, head and neck cancer, root canal therapy

İyonlaştırıcı radyasyonun endodontik güta-perkaların mikro yapısı ve fiziksel özellikleri üzerine etkisi

Abstract

Amaç: Baş veya boyun kanserinde radyoterapi gören hastalar genellikle radyasyon etkileri nedeniyle kök kanal tedavilerine ihtiyaç duyarlar. Geleneksel tedavi sırasında kullanılanlara benzer dozlardaki iyonlaştırıcı radyasyonun (IR), farklı markalardaki endodontik güta-perka noktalarının (EGP’ler) yüzeyini ve fizikomekanik özelliklerini etkileyip etkilemediğinin belirlenmesi son derece önemlidir ve bu çalışmanın amacını oluşturmaktadır.

Gereç ve Yöntem: Üç markaya (Meta-Biomed, Dentsply ve Hygenic) ait 123 EGP, gruplara ayrılarak 25 fraksiyona bölünmüş toplam 50 Gy dozda IR’ye maruz bırakılıp bırakılmadı. Tüm EGP’lere çekme mukavemeti ve mikrosertlik testleri yapıldı. IR’ye maruz kalma nedeniyle olası mikroyapısal yüzey değişikliklerini tanımlamak için taramalı elektron mikroskobu gözlemleri kullanıldı. Her markanın organik-inorganik oranı belirlendi.

Bulgular: IR’ye maruz kaldıktan sonra yalnızca Meta-Biomed markasının EGP’leri önemli değişiklikler yaşadı, çekme mukavemetinde önemli bir azalma ve mikro sertlik arttı. Ayrıca yüzey mikro yapısında geniş bir yüzey alanını etkileyen koyu çizgiler görülüyordu; bu çizgilerden bazıları merkezde derindi ve düzensiz ve pürüzsüz olmayan yüzeyler oluşturan, değişken derinlik ve uzantılara sahip boşluklar gözlemlendi. Organik bileşen oranı en yüksek markaydı.

Sonuç: Test edilen markalardan biri olan Meta-Biomed’in fiziko-mekanik özellikleri ve yüzey mikro yapısı, konvansiyonel baş veya boyun kanseri tedavisi sırasında kullanılan dozlarda IR’den önemli ölçüde etkilenirken, diğer markalar daha az etkilendi veya hiç etkilenmedi.

Keywords

radyoterapi, endodontik güta-perka, mikro yapı, baş ve boyun kanseri

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