Influence of root embedment material and periodontal ligament simulation on fracture resistance tests

Soares, Carlos José; Pizi, Eliane Cristina Gava; Fonseca, Rodrigo Borges; Martins, Luís Roberto Marcondes

doi:10.1590/s1806-83242005000100003

Cited by 266 publications

(273 citation statements)

References 12 publications

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“…The simulation of the periodontal ligament should be done with an elastomeric material that is able to undergo elastic deformation and reproduce the accommodation of the tooth in the alveolus, providing no concentration of stresses in the cervical region of the tooth (10). Moreover, simulation of the periodontal ligament is highly influential on the fracture pattern (10). In this experiment, a polyether impression material was used in association with a polystyrene resin as an adequate method for fracture strength tests (10,16).…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, simulation of the periodontal ligament is highly influential on the fracture pattern (10). In this experiment, a polyether impression material was used in association with a polystyrene resin as an adequate method for fracture strength tests (10,16). The method used for loading is another important factor.…”

Section: Discussionmentioning

confidence: 99%

“…A distance between both teeth was established at 11.0 mm, which represent the mean mesiodistal length of a first human molar. Periodontal ligaments were simulated inside the cylinder using a polyether impression material (Impregum F; 3M/ESPE, St. Paul, MN, USA) to simulate physiological tooth mobility (10).…”

Section: Methodsmentioning

confidence: 99%

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Fracture strength of composite fixed partial denture using bovine teeth as a substitute for human teeth with or without fiber-reinforcement

et al. 2010

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This study evaluate the use of bovine teeth as a substitute for human teeth on fracture strength tests of composite fixed partial dentures (Cpd), with and without fiberglass reinforcement (Fg). Eighty teeth were selected, being 40 bovine incisors, 20 human premolars and 20 molars. Bovine incisors were ground to get a platform, simulating an occlusal surface of human molar. Teeth in pairs were embedded in polystyrene resin, simulating the periodontal ligament and divided in 4 groups: B-Cpd-Fg: bovine teeth restored with Cpd with Fg; B-Cpd-NFg: bovine teeth restored with Cpd without Fg; H-Cpd-Fg: human teeth restored Cpd with Fg; and H-Cpd-NFg: human teeth restored with Cpd without Fg. The Cpd were adhesively fixed and submitted to an axial compression load at the pontic center with a crosshead speed of 0.5 mm/min until fracture. Failure modes were assessed and classified. Data were subjected to two-way ANOVA and Tukey's HSD test (α=0.05). The tooth type had no influence on fracture strength and fracture mode. The inclusion of fiberglass increased significantly the fracture strength. The failure modes were more reparable in groups with fiber-reinforcement. Bovine teeth can be used as a substitute for human teeth in these types of fracture strength tests.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Fracture strength of composite fixed partial denture using bovine teeth as a substitute for human teeth with or without fiber-reinforcement

et al. 2010

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“…This would then result in displacement of the tooth during testing. Previous studies even showed that periodontal ligament simulation could change the fracture strength results and failure modes in a positive way in that the ligament could serve as a shock absorber [28,29]. In previous studies while some did not fill the canal [30], others did fill the canals with endodontic filling materials [3,6,16].…”

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confidence: 99%

Fracture strength, failure type and Weibull characteristics of lithium disilicate and multiphase resin composite endocrowns under axial and lateral forces

et al. 2016

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OBJECTIVE Multiphase resin composite materials have been advocated as an alternative to reinforced ceramics but limited information is available to date on their stability. This in vitro study evaluated the effect of axial and lateral forces on the strength of endocrowns made of Li2Si2O5 and multiphase resin composite. METHODS Sound human molars (N=60, n=10 per group) were randomly divided into 6 groups: Group C: Control, no preparation or restoration; Group LI: Endocrown made of Li2Si2O5 (IPS e.max CAD) and Group LA: Endocrown made of multiphase resin composite material (Lava Ultimate). After decapitation and endodontic preparation, immediate dentin sealing was performed. Following CAD/CAM fabrication, their cementation surfaces were silica coated (CoJet System) and silanized (ESPE-Sil). Endocrowns were then adhesively cemented (Variolink II). All specimens were thermocycled (×10,000 cycles). While half of the specimens in each group were subjected to axial (C(A), LI(A), LA(A)), the other half was subjected to lateral static (C(L), LI(L), LA(L)) loading (1mm/min). Failure type and location after debonding/fracture were classified. Data were analyzed using ANOVA and Tukey's post hoc test ( =0.05). Two-parameter Weibull distribution values including the Weibull modulus, scale (m) and shape (0), values were calculated. RESULTS Under axial loading, mean fracture strength (N) did not show significant difference between groups: LAA (2675±588)(a), LIA (2428±566)(a), CA (2151±672)(a) (p>0.05) and under lateral loading, LAL (838±169)(A) presented significantly lower mean values than those of other groups: CL (1499±418)(B), LIL (1118±173)(B) (p<0.05). Both endocrown materials and the control group were more vulnerable to lateral loading than axial loading. Under axial loading, Weibull distribution presented higher shape (0) for Groups LIA (5.35) and LAA (5.08) than that of the control (3.97) and under lateral loading LIL (7.5) showed higher shape (0) than those of other groups (4.69-6.46). After axial loading, failure types were mainly cohesive in the material and after lateral loading primarily adhesive between the material and dentin for both LI and LA, most of which were repairable. SIGNIFICANCE Under axial loading, molars restored with endocrowns performed similar with both Li2Si2O5 and multiphase resin composite but the latter was less durable under lateral loading. loading LI L (7.5) showed higher shape ( 0 ) than those of other groups (4.69-6.46). After axial loading, failure types were mainly cohesive in the material and after lateral loading primarily adhesive between the material and dentin for both LI and LA, most of which were repairable.Significance. Under axial loading, molars restored with endocrowns performed similar with both Li 2 Si 2 O 5 and multiphase resin composite but the latter was less durable under lateral loading.Keywords: CAD/CAM; Composite; Ceramic; Endocrowns; Endodontics; Hybrid materials; Lithium disilicate IntroductionSevere coronal tooth structure loss due to extensive caries o...

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“…20 The coronal portion of each tooth was sectioned 15 mm coronally from the root apex, using a diamond double-faced disk # 7020 (KG Sorensen, Barueri, Brazil).…”

Section: Methodology Sample Preparationmentioning

confidence: 99%

Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

et al. 2013

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The aim of this study was to evaluate the effect of parallel and tapered threaded post placement on the strain and stress distribution of endodontically treated teeth. Fifteen bovine incisors were sectioned 15 mm from their apices, endodontically treated, and divided into three groups (n = 5) according to three different threaded posts: parallel threaded post (Radix-Anker, RA); tapered threaded post (Euro-Post, EP) and tapered threaded post (Reforpost II, RII). A strain-gauge was fixed on the proximal surface perpendicular to the long root axis, 2 mm from the cervical limit. Strain generated during post placement was recorded and compared using one-way ANOVA and Tukey's test (α = .05). A scanning electron microscope was used to examine the longitudinal root sections. Stress was evaluated for each group in a two-dimensional finite element analysis. The models were meshed with tetrahedron elements and loaded with 2 N at an angle of 135° to the lingual face. The equivalent Von Mises stress was calculated. The one-way ANOVA showed significant difference among the groups. The RA group (150.0 ± 12.2 A) produced higher external strain than the RII (80.0 ± 12.2 B) and the EP (70.0 ± 6.1 B) groups. The inner strain was approximately five times greater than the external dentin strain. High stress concentrations in each thread of the posts were observed. Scanning electron micrographs showed cracks that started in the threads of the posts. The threaded post placement induced root strain mainly on the parallel side post. Root strain and stress concentration on the post threads tended to create cracks in the inner root canal dentin.

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Influence of root embedment material and periodontal ligament simulation on fracture resistance tests

Cited by 266 publications

References 12 publications

Fracture strength of composite fixed partial denture using bovine teeth as a substitute for human teeth with or without fiber-reinforcement

Fracture strength of composite fixed partial denture using bovine teeth as a substitute for human teeth with or without fiber-reinforcement

Fracture strength, failure type and Weibull characteristics of lithium disilicate and multiphase resin composite endocrowns under axial and lateral forces

Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

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