A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties

Different types of intraradicular posts are available to restore the endodontically-treated teeth. However, debonding of the post is still the main drawback till date. In this study, we developed a porous titanium dental post with porosity to increase the flexibility of the post, and with porous sur...

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Main Author:	Al-Hajj, Mohammed Nasser Ahmed
Format:	Thesis
Language:	English
Published:	2022
Subjects:	RK1-715 Dentistry
Online Access:	http://eprints.usm.my/57761/1/MOHAMMED%20NASSER%20AHMED%20AL-HAJJ-FINAL%20THESIS%20P-SGD000419%28R%29%20-24%20pages.pdf
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spelling	my-usm-ep.577612023-04-11T01:40:47Z A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties 2022-08 Al-Hajj, Mohammed Nasser Ahmed RK1-715 Dentistry Different types of intraradicular posts are available to restore the endodontically-treated teeth. However, debonding of the post is still the main drawback till date. In this study, we developed a porous titanium dental post with porosity to increase the flexibility of the post, and with porous surface to improve the micro-interlocking with the luting cement. In the first part, pure titanium powder was mixed with wax binder (as space holder) in three different percentages (85%, 90%, and 95% wt. titanium powder). The samples were exposed to heating temperature through two phases. In the first phase (air heating), the samples were heated in an open-air environment for 2 hours (at 380◦C) to remove the wax binder. In the second phase, the samples were sintered in a tube furnace with argon environment for 10 hours (at 1100◦C) to complete the process. The samples were then characterized and tested to select the best mixture for further investigation. The field-emission scanning electron microscopy (FESEM) showed good roughness of the surface and thorough porosity of the structure, with better melting of the titanium particles in the 85% group. The energy dispersive X- ray spectrometry (EDX) analysis showed higher percentages of titanium within the material. The density values were close to the theoretical ones, and the porosity revealed good distribution with less than half of the volume (40%). The compressive and flexural strength tests revealed higher values of 85% group than other groups. The 85% group was then selected to fabricate the porous titanium post (PTP). In the second part, 96 extracted human teeth were collected to investigate the push-out bond strength of the porous post. Two different luting cements (RelyX U200TM 3M ESPE and ParaCore® Coltene Whaledent) were used and the roots were sectioned at the coronal and middle levels (3.00 ± 0.2 mm thickness). The push-out bond strength of the PTP was compared to other dental posts (Coltene Whaledent) namely commercially-pure titanium post (CTP) (ParaPost® XP), stainless steel post (SSP) (ParaPost® XP), and fiber glass post (FGP) (ParaPost® Fiber Lux). The push-out bond strength values of PTP were comparable to that of the other posts, with no significant differences (P> 0.05) in RelyX U200 group at both sections of the root. The adhesion of PTP was better than the other posts, with no prevalence of post-cement failure in PTP. FESEM images on the post-cement-dentin interface showed better adhesion of PTP to both types of cements, with no visible separating line between post and cement. The findings of this study provide a possibility to use the porous titanium post as alternative option for dental post systems. 2022-08 Thesis http://eprints.usm.my/57761/ http://eprints.usm.my/57761/1/MOHAMMED%20NASSER%20AHMED%20AL-HAJJ-FINAL%20THESIS%20P-SGD000419%28R%29%20-24%20pages.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Pergigian
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	RK1-715 Dentistry
spellingShingle	RK1-715 Dentistry Al-Hajj, Mohammed Nasser Ahmed A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties
description	Different types of intraradicular posts are available to restore the endodontically-treated teeth. However, debonding of the post is still the main drawback till date. In this study, we developed a porous titanium dental post with porosity to increase the flexibility of the post, and with porous surface to improve the micro-interlocking with the luting cement. In the first part, pure titanium powder was mixed with wax binder (as space holder) in three different percentages (85%, 90%, and 95% wt. titanium powder). The samples were exposed to heating temperature through two phases. In the first phase (air heating), the samples were heated in an open-air environment for 2 hours (at 380◦C) to remove the wax binder. In the second phase, the samples were sintered in a tube furnace with argon environment for 10 hours (at 1100◦C) to complete the process. The samples were then characterized and tested to select the best mixture for further investigation. The field-emission scanning electron microscopy (FESEM) showed good roughness of the surface and thorough porosity of the structure, with better melting of the titanium particles in the 85% group. The energy dispersive X- ray spectrometry (EDX) analysis showed higher percentages of titanium within the material. The density values were close to the theoretical ones, and the porosity revealed good distribution with less than half of the volume (40%). The compressive and flexural strength tests revealed higher values of 85% group than other groups. The 85% group was then selected to fabricate the porous titanium post (PTP). In the second part, 96 extracted human teeth were collected to investigate the push-out bond strength of the porous post. Two different luting cements (RelyX U200TM 3M ESPE and ParaCore® Coltene Whaledent) were used and the roots were sectioned at the coronal and middle levels (3.00 ± 0.2 mm thickness). The push-out bond strength of the PTP was compared to other dental posts (Coltene Whaledent) namely commercially-pure titanium post (CTP) (ParaPost® XP), stainless steel post (SSP) (ParaPost® XP), and fiber glass post (FGP) (ParaPost® Fiber Lux). The push-out bond strength values of PTP were comparable to that of the other posts, with no significant differences (P> 0.05) in RelyX U200 group at both sections of the root. The adhesion of PTP was better than the other posts, with no prevalence of post-cement failure in PTP. FESEM images on the post-cement-dentin interface showed better adhesion of PTP to both types of cements, with no visible separating line between post and cement. The findings of this study provide a possibility to use the porous titanium post as alternative option for dental post systems.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Al-Hajj, Mohammed Nasser Ahmed
author_facet	Al-Hajj, Mohammed Nasser Ahmed
author_sort	Al-Hajj, Mohammed Nasser Ahmed
title	A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties
title_short	A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties
title_full	A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties
title_fullStr	A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties
title_full_unstemmed	A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties
title_sort	novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Pergigian
publishDate	2022
url	http://eprints.usm.my/57761/1/MOHAMMED%20NASSER%20AHMED%20AL-HAJJ-FINAL%20THESIS%20P-SGD000419%28R%29%20-24%20pages.pdf
_version_	1776101209124372480

A novel moldless sintering porous titanium for dental post system: development, characterization and evaluation of mechanical properties

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