Photoelastic analysis of stress generated by a silorane-based restoration system

Lopes, Murilo Baena; Valarini, Natália; Moura, Sandra Kiss; Guiraldo, Ricardo Danil; Júnior, Alcides Gonini

doi:10.1590/s1806-83242011000400004

Cited by 10 publications

(9 citation statements)

References 22 publications

(30 reference statements)

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“…The stress generated by each component of the restorative systems (Filtek P90, Filtek Z350, Filtek Z350 flow, composites, primers and adhesives) was tested individually 13 . A higher contraction stress was observed for the adhesive of the Filtek Silorane system compared to the methacrylates.…”

Section: Discussionmentioning

confidence: 99%

Six-month evaluation of a resin/dentin interface created by methacrylate and silorane-based materials

Sampaio¹,

Wang

Carvalho³

et al. 2013

J. Appl. Oral Sci.

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Objectives:This study aimed to compare the micro-tensile bond strength of methacrylate resin systems to a silorane-based restorative system on dentin after 24 hours and six months water storage.Material and Methods:The restorative systems Adper Single Bond 2/Filtek Z350 (ASB), Clearfil SE Bond/Z350 (CF), Adper SE Plus/Z350 (ASEP) and P90 Adhesive System/Filtek P90 (P90) were applied on flat dentin surfaces of 20 third molars (n=5). The restored teeth were sectioned perpendicularly to the bonding interface to obtain sticks (0.8 mm2) to be tested after 24 hours (24 h) and 6 months (6 m) of water storage, in a universal testing machine at 0.5 mm/min. The data was analyzed via two-way Analysis of Variance/Bonferroni post hoc tests at 5% global significance.Results:Overall outcomes did not indicate a statistical difference for the resin systems (p=0.26) nor time (p=0.62). No interaction between material x time was detected (p=0.28). Mean standard-deviation in MPa at 24 h and 6 m were: ASB 31.38 (4.53) and 30.06 (1.95), CF 34.26 (3.47) and 32.75 (4.18), ASEP 29.54 (4.14) and 33.47 (2.47), P90 30.27 (2.03) and 31.34 (2.19).Conclusions:The silorane-based system showed a similar performance to methacrylate-based materials on dentin. All systems were stable in terms of bond strength up to 6 month of water storage.

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Section: Discussionmentioning

confidence: 99%

Six-month evaluation of a resin/dentin interface created by methacrylate and silorane-based materials

Sampaio¹,

Wang

Carvalho³

et al. 2013

J. Appl. Oral Sci.

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“…The photos were visually examined to quantify and identify the location of stress throughout the endodontic post. Fringes were quantified considering a value of 1.00 (blue region) for a full fringe and intermediate values for incomplete fringes as follows: 0.25, red; 0.50, yellow and 0.75, green (25). Specimens were divided into six locations: the palatal cervical third (P1), palatal middle third (P2), palatal apical third (P3), vestibular cervical third (V4), vestibular middle third (V5), vestibular apical third (V6).…”

Section: Methodsmentioning

confidence: 99%

Stress Generated by Customized Glass Fiber Posts and Other Types by Photoelastic Analysis

et al. 2015

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Endodontic posts are necessary to provide adequate retention and support when no sufficient remaining structure is available to retain the core. There are different materials and techniques to construct post-and-core, but there is no consensus about which one promotes better stress distribution on the remaining tooth structure. This study aimed to quantify and evaluate the distribution of stress in the root produced by customized glass fiber posts compared to different endodontic posts. Twenty-five simulated roots from photoelastic resin were made and divided into 5 groups: CPC, cast post-and-core; SP, screw post; CF, carbon fiber post; GF, glass fiber post; and CGF, customized glass fiber post. After cementing CPC and SP posts with zinc phosphate cement, and CF, GF and CGF posts with resin cement, resin cores were made for groups 2-5. Specimens were evaluated with vertical or 45° oblique loading. To analyze the fringes, the root was divided into 6 parts: palatal cervical, palatal middle, palatal apical, vestibular cervical, vestibular middle, and vestibular apical. The formed fringes were photographed and quantified. Data were recorded and subjected to two-way ANOVA and Tukey's test (5%). SP (1.95±0.60) showed higher stress (p<0.05) compared to the others (CPC-0.52±0.74; CF-0.50±0.75, GF-0.23±0.48 and CGF-0.45±0.83). All posts showed high stress in apical third (CPC-1.40±0.65; SP-2.30±0.44, CF-1.80±0.45, GF-1.20±0.45, CGF-1.70±1.03) Low stress was found in cervical third (CPC-0.20±0.45; CF-0.00±0.00, GF-0.00±0.00, CGF-0.00±0.00), except by SP (1.90±0.65), which showed statistical difference (p<0.05). Customized post showed high stress concentration at the root and conventional glass fiber posts showed more favorable biomechanical behavior.

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“…Photoelasticity has been widely used in Dentistry, especially in Orthodontics, 16 , 19 , 20 Oral and Maxillofacial Surgery, 21 Restorative Cosmetic Dentistry, 22 , 23 Prosthodontics, 24 Periodontology 25 and Implantology, 26 to evaluate occlusion recovery. To this end, models with specific photoelastic resins are manufactured to simulate the effects of mechanotherapy on the structures to be studied.…”

Section: Introductionmentioning

confidence: 99%

Photoelastic analysis of stress generated by Connecticut Intrusion Arch (CIA)

Schwertner

Almeida

Gonini

et al. 2017

Dental Press J. Orthod.

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Objective: The present in vitro study evaluated, by means of the photoelastic technique, the effects generated by the Connecticut Intrusion Arch (CIA), with a 90o bend on the distal surface of molar tubes and using the 4 x 2 appliance on the anterior and posterior regions of the upper dental arch. Methods: Five models were manufactured, in which two different clinical situations were correlated: 1) use of intrusion arch not cinched back and transpalatal bar for anchorage (Group 1); 2) use of intrusion arch cinched back and transpalatal bar for anchorage (Group 2). Stress generated in the apical and middle regions of tooth roots of maxillary anterior teeth and maxillary first molars was evaluated.Results: Taking a reference value of 1.0 MPa = 100%, qualitative descriptive analysis was performed, which showed uniformity between stress values in the apical region of anterior teeth of both groups (G1 and G2). In the posterior region, for models with the arch cinched back (G2), stress remained within 100%. As for G1 models (with the arch not cinched back), variations in the mesial surface of first molars were observed, with an increase of 20% in the generated stress. The apical region did not undergo any changes, while in the distal region of molars there was a decrease of 20% in stress.Conclusion: Laboratory results revealed differences in stress between Groups 1 and 2 in the molar region, thereby indicating that there was a tendency towards mesial root tipping of first molars when the distal end of the CIA was not cinched back.

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Photoelastic analysis of stress generated by a silorane-based restoration system

Cited by 10 publications

References 22 publications

Six-month evaluation of a resin/dentin interface created by methacrylate and silorane-based materials

Six-month evaluation of a resin/dentin interface created by methacrylate and silorane-based materials

Stress Generated by Customized Glass Fiber Posts and Other Types by Photoelastic Analysis

Photoelastic analysis of stress generated by Connecticut Intrusion Arch (CIA)

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