Experimental polyethylene–hydroxyapatite carrier‐based endodontic system: an in vitro study on dynamic thermomechanical properties, sealing ability, and measurements of micro‐computed tomography voids
Abstract:The dynamic thermomechanical properties, sealing ability, and voids formation of an experimental obturation hydroxyapatite-reinforced polyethylene (HA/PE) composite/carrier system were investigated and compared with those of a commercial system [GuttaCore (GC)]. The HA/PE system was specifically designed using a melt-extrusion process. The viscoelastic properties of HA/PE were determined using a dynamic thermomechanical analyser. Human single-rooted teeth were endodontically instrumented and obturated using HA… Show more
“…Many scholars have employed different designs for investigating voids 15 , 16 , 24 , 25 , 26 in the root canals ( Table 4 ). In this study, images of the roots were divided into three intervals, namely 2–4, 4–6, and 6–8 mm intervals; these intervals corresponded to three cross-sections of the roots, namely the apical 1/3, middle 1/3, and coronal 1/3, respectively.…”
“…Many scholars have employed different designs for investigating voids 15 , 16 , 24 , 25 , 26 in the root canals ( Table 4 ). In this study, images of the roots were divided into three intervals, namely 2–4, 4–6, and 6–8 mm intervals; these intervals corresponded to three cross-sections of the roots, namely the apical 1/3, middle 1/3, and coronal 1/3, respectively.…”
“…More to the point, dental applications of apatites include direct pulp capping [306,[386][387][388][389][390], dentin hypersensitivity treatments [164-166], using in endodontics [391][392][393][394][395][396][397][398][399][400][401][402][403][404][405][406][407][408], orthodontics [409][410][411][412][413][414][415][416][417], oral and maxillofacial surgery [290,336,, orthognathic surgery [445][446][447][448][449], prosthodontics [450][451][452][453][454][455][456][457]…”
“…Dental restorative materials contribute to restoring the anatomical form and function of tooth structure; however, new restorative materials should have bioactive functions to provide a therapeutic effect (Imazato, 2009; Khan & Syed, 2019). Bioactive materials included bioactive glass (BG) (Fernando et al, 2017; Sauro et al, 2018; Tezvergil‐Mutluay et al, 2017), calcium phosphate (Ibrahim et al, 2018; Zhao et al, 2011), hydroxyapatite (HA) (Alhashimi et al, 2016; Toledano et al, 2020), and calcium silicate (Niu et al, 2014). These bioactive materials have the effect of stimulating living tissues to regenerate tissue and they are chemically similar to bone and teeth (Epple et al, 2010).…”
Aim
To fabricate and characterize nano‐hydroxyapatite (nHA) grafted and non‐grafted glass fibre‐based endodontic posts.
Methodology
Experimental glass fibre posts were fabricated using silanized nHA grafted (ex‐HA) and non‐grafted glass fibre (ex‐P) reinforced resins. The structural analysis and morphological patterns were analysed with Fourier transform infrared spectroscopy and scanning electron microscopy, respectively. EverStick® glass fibre posts (eS) were used as a control group. The degree of conversion, flexural strength, and flexural modulus was investigated and the fractured structure was evaluated with a scanning electron microscope. Root canals were prepared in human extracted teeth restored with experimental and control posts. The push‐out bond strength was evaluated with radicular dentine at days 7, 30, and 90, and the presence of voids at the interface were measured at day 1, 7, 30, and 90 with micro‐computed tomography. The Shapiro–Wilk test and one‐way ANOVA post‐hoc Tukey's test were performed. The level of significance was set at 0.05.
Results
The SEM and FTIR confirmed the presence of a silane‐coupling agent on the glass fibres. The ex‐HA post had a significantly lower degree of conversion compared to the ex‐P post (p = .0008), but a significantly higher conversion than the eS post (p = .0014). The maximum flexural strength value was obtained with the ex‐HA post with an insignificant difference (p = .366) compared to ex‐P post and a significant difference (p = .029) compared to the eS post. The flexural modulus of ex‐HA, ex‐P, and eS posts were significantly different (p = .037). Similarly, the ex‐HA post had a significantly higher push‐out bond strength at days 7 and 30 (p = .037) compared to the ex‐P and eS posts. The volume of voids had a nonlinear behaviour amongst the groups with no significant difference between the posts.
Conclusion
The fabrication of the experimental posts was successful and the ex‐HA post had greater flexural strength and push‐out bond strength compared to the ex‐P post. The degree of conversion of the ex‐HA post was lower than the ex‐P and eS posts. The volume of voids of ex‐HA and ex‐P posts was lower than that of eS posts.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.