Root Dentin Strain and Temperature Rise During Endodontic Treatment and Post Rehabilitation

Abstract

This study investigated the effects of endodontic treatment procedures and different post systems rehabilitation steps on the strain and temperature rise on apical and cervical root dentin regions. Twenty-one extracted human canine teeth had two strain gages attached to the distal root surface and two thermocouples attached to the mesial root surface (cervical and apical). The strain and temperature rise were recorded during the following procedures: root canal preparation, final rinse and drying, root canal filling and canal relief. Then the teeth were divided into three groups (n=7), according to the type of post system: CPC, cast post and core; FGP, fiberglass post; and PSP, prefabricated steel post. Data continued to be recorded during the post space preparation, post modeling (only for CPC), post trying and post cementation. Data were subjected to a two-way ANOVA followed by Tukey's test (α=0.05). The post-space preparation caused the highest temperature rise (4.0-14.9 °C) and the highest strain in the apical region during irrespective of post type. The resin cement light-activation resulted in significant temperature increases in the cervical region for all of the groups. The canal relief and the post-space preparation produced highest temperature rises. The CPC post modeling resulted in higher root strain level similarly the level of post preparation. The PSP resulted in highest strain during post trying and post cementation.

Longevity of bond strength of resin cements to root dentine after radiation therapy

“…The qualitative analysis by SEM in the present study revealed the presence of fractures and microfractures in the root dentine of irradiated teeth (Fig. 1), which may be related to the deformation generated in the tooth structure during the endodontic treatment and preparation of the post space (Amade et al 2013, Versiani et al 2015. During the chemical-mechanical preparation of the root canal, the reciprocating instrument R50 (Reciproc, VDW GmbH) was used, which has been associated with the formation of microfractures in root dentine (Li et al 2015), because of the kinematics which gives the counter-clockwise movement (cutting action) and clockwise (release of the tool) developed to avoid cyclic fatigue (Al-hadlaq et al 2010), plus the cross-sectional transportation of debris from apical areas of tension that can generate defects in root dentine (Gergi et al 2015).…”

“…), which may be related to the deformation generated in the tooth structure during the endodontic treatment and preparation of the post space (Amade et al . , Versiani et al . ).…”

Effect of Resin Cement Porosity on Retention of Glass-Fiber Posts to Root Dentin: An Experimental and Finite Element Analysis

“…Root canal openings were filled with resin modified glass ionomer cement (Vitremer; 3M-ESPE, St Paul, MN, USA), and the samples were stored at 37 °C in distilled water for 1 week. After this period, the canal relief was performed immediately after filling, using a heated instrument (GP heater; Dentsply Maillefer) to remove the gutta-percha to a depth of 10 mm (16). The post spaces were prepared to a depth of 10 mm with special preparation drills supplied by the manufacturer of the fiber posts (Exacto #3; Angelus, Londrina, PR, Brazil).…”

How biomechanics can affect the endodontic treated teeth and their restorative procedures?

“…Endodontic treatment followed by direct composite restoration was an effective method to reestablish oral biomechanical performance. 17,18 The performance of endodontic treated teeth is strongly related to the biomechanics events involved during all the phases of the endodontic treatment 19,20 and also during the restorative procedure of these teeth. 9,20 Therefore, this review article will focus on biomechanics effect involved on tooth structurers influenced by endodontic treatment, on the root instrumentation and obturation, on the restorative procedure used, and their consequences to the clinical longevity of the restored endodontic treated teeth.…”