Abstract
This study objectives to evaluate the fracture strength of upper central incisors (UCI) restored with composite resin (CR) in Class III cavities and endodontically treated teeth with or without glass fiber post (GFP), analyzing their failure mode. Sixty human UCI were randomly divided into four experimental groups: endodontically treated teeth without GFP (G1), endodontically treated teeth with GFP (G2), teeth with mesial/distal Class III cavities restored with CR without GFP (G3), and teeth with mesial/distal Class III cavities restored with CR with GFP (G4). The samples were submitted to the fracture strength test in a universal testing machine with a compression shear load applied at speed of 1.0 mm/min until fracture occurred. The data were submitted to one-way ANOVA (α=0.05) and the samples were analyzed for failure mode. The analysis did not show a significant statistical difference in fracture strength between the groups (p>0.05). The results showed that only endodontically treated teeth (G1) (753.4N) presented behavior similar to teeth with GFP (G2) (702.1N). The same occurred when comparing teeth with Class III cavities without GFP (G3) (670.2 N) and with GFP (G4) (746.1N). It can be concluded that glass fiber posts do not change the fracture strength of incisors with endodontic treatment and Class III cavities.
Highlights
Treated teeth with little remaining crown structure are considered more fragile than healthy teeth due to the loss of healthy dental structure (KARZOUN et al, 2015)
The one-way ANOVA showed a value of p=0.6426, meaning there was no statistical difference between the groups evaluated (Table 1)
Glass fiber posts (GFP) are widely used to restore anterior teeth (NAUMANN et al, 2012; STERZENBACH et al, 2012) because they present a modulus of elasticity similar to that of dentin (LASSILA et al, 2004; DIETSCHI et al, 2007; ZICARI et al, 2013), contrary to the cast metal cores (CMC) that require higher root dentin wear, a greater number of clinical sessions for preparation, and present a modulus of elasticity around 200 GPa, which increases the chances of fracture of the dental element (ARTOPOULOU et al, 2006; SARKISONOFRE et al, 2014)
Summary
Treated teeth with little remaining crown structure are considered more fragile than healthy teeth due to the loss of healthy dental structure (KARZOUN et al, 2015) In such cases, the use of an intraradicular post is indicated to promote retention to the future restoration. Glass fiber posts (GFP) have advantages over metal posts because they provide better aesthetics and dentin-like biomechanical properties (GORACCI et al, 2007; MARTELLI et al, 2008; SANTOS-FILHO et al, 2008; MOSHARRAF et al, 2012; AMARNATH et al, 2015) Their retention is related to specific characteristics such as post length, type of cement used, and amount of remaining tooth structure (ALOMARI et al, 2011; MAKADE et al, 2011; INAGAKI et al, 2014; KHOROUSHI et al, 2016)
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