Vol. 14 No. 3 (2024): International Dental Research

DOI: https://doi.org/10.5577/idr.2024.vol14.no3

Published: 31.12.2024

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Original Article

Evaluation of biomechanical effects of different treatment procedures and materials used in teeth with incomplete root development using finite element analysis

Aim: The purpose of the present study is to evaluate, using finite element analysis (FEA), the stresses generated by the applications of partial pulpotomy, apexification, and regenerative endodontic procedure (REP), as well as the materials that can be used in these treatment procedures—calcium hydroxide (CH), mineral trioxide aggregate (MTA), BioAggregate (BA), and Biodentine (BD)—under functional forces on models of teeth having incomplete root development. Methodology: A maxillary incisor tooth model with complete root development and surrounding tissues was created three-dimensionally, utilizing tomography data in a computer environment. Based on this model, two healthy tooth models with complete and incomplete root development were created. In addition, 17 treatment procedure models were simulated, performing the applications of partial pulpotomy, apexification, and REP, using the materials CH, MTA, BA, and BD. Von Mises stress values that were generated in the tooth by applying functional mastication force were examined with FEA in three regions: apical, middle, and cervical. The results were evaluated using Altair Evolve structural analysis software and taking Von Mises criteria into consideration while the stress value range was limited from 0 to 10+ MP. Results: Completion of root development decreased the stresses in the teeth that had incomplete root development. In the partial pulpotomy models, the stresses that formed in the teeth decreased after completion of apexogenesis, and once again, completion of root development by formation of cement-like tissue following REP decreased the stresses that formed in the teeth. The highest stress values were detected in the apical and middle root regions of the models that simulated apexification, compared to other models. The evaluations of the materials used in these treatment procedures revealed that the highest stress values formed in the models that simulated the use of CH. MTA, BioAggregate, and Biodentine generated similar levels of stress, whereas the lowest level of stress was generated in the model that applied MTA. Conclusion: The selection of treatment procedures that stimulate root development is helpful in reducing stresses generated in teeth that have incomplete root development. Treatment models performed using MTA strengthened the tooth structure more than treatments performed using CH, BA, or BD.

Partial pulpotomy, apexification, finite element analysis, Mineral Trioxide Aggregate, Biodentine, BioAggregate

Elif Aslan, Buket Ayna
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93-104
Abstract Views: 1646 Download: 586 10.5577/intdentres.514
Evaluation of the effects of different surface treatments on the bond strength of recent CAD-CAM hybrid ceramics

Aim: The aim of this study was to evaluate the effect of different surface treatments (control, hydrofluoric [HF] acid, sandblasting with Al 2 O 3 particles, tribochemical silica coating, and fiber laser) on the surface structure and shear bond strength of ceramics. Methodology: A total of 120 specimens were used for the evaluation of shear bond strength and 10 specimens for SEM. The ceramics were divided into two groups according to ceramic type and further divided into five subgroups according to surface treatments. SEM images were taken from each group after the surface treatments. Clearfil Ceramic Primer Plus silane was applied to all specimens. Panavia V5 adhesive resin cement was applied to the samples. The bond strength was measured through a shear test using the universal testing machine. A stereomicroscope was used to analyze the surfaces for the failure type. To determine statistical significance, one-way analysis of variance (ANOVA), Tamhane Multiple Comparison, Kruskal-Wallis H, Mann-Whitney U, and Bonferroni-corrected Mann-Whitney U tests were used. Results: The highest bond strengths were obtained for the groups treated with HF acid and sandblasting with Al 2 O 3 . The bonding strength values of Vita Enamic were higher than those of Lava Ultimate Conclusion: HF acid was the best treatment to increase the bond strength between ceramic and cement.

Bond strength, CAD-CAM, hybrid ceramic, SEM analysis, surface treatments

Merve Tokgöz Çetindağ, Ayşe Meşe, Begüm Evran
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105-113
Abstract Views: 1520 Download: 313 10.5577/intdentres.421
YouTube as an information resource for early orthodontic treatment with clear aligners

Aim: The aim of this study is to evaluate the content, reliability, and quality of videos about early orthodontic treatment with clear aligners on YouTube. Methodology: Using the most frequently employed search terms—“Invisalign First” and “aligner for kids”—the authors searched YouTube for relevant videos and recorded the number of views, likes, comments, video duration, and days since uploading. An 11-point content score was employed to identify low- and high-quality videos, and the global quality scale (GQS) was used to examine the quality of the videos. This study adopted a modified version of the DISCERN tool for evaluating the reliability of health and medical information and used the Mann-Whitney U test to compare the video groups with high- and low-quality content. A p -value of <0.05 was deemed statistically significant. Results: A content analysis classified 26% of the YouTube videos as high-quality content and 74% as low-quality content. The most frequent topics in the videos were descriptions of the appliance (66%) and the types and mechanism of the appliance (51%), whereas the least mentioned topics were the cost of treatment (13%), the disadvantages of the appliance (5%), and comparisons of treatment options (15%). The quality of the videos was evaluated as moderate in 36% of the 61 videos, poor or generally poor in 28%, and good or excellent in 36%. The mean reliability score (2.49±1.29) indicates that the videos’ reliability was generally poor. The high-quality content group had a greater mean video length, viewing rate, and GQS and reliability score than the low-quality content group. A statistically significant positive correlation was identified between content score, GQS, and reliability score values ( p <0.05). Conclusion: YouTube video content relating to early orthodontic treatment with clear aligners was generally inadequate. The quality of the videos was moderate, but the reliability score indicated that they were not generally reliable. Orthodontists should be aware of the inadequacies of YouTube recordings and ensure that patients have access to accurate and reliable recordings. How to cite this article: Dursun D, Bilici Geçer R, Sadry S. YouTube as an information resource for early orthodontic treatment with clear aligners. Int Dent Res. 2024;14(3):114-121. https://doi.org/10.5577/intdentres.519

YouTube, early orthodontic treatment, clear aligners, DISCERN, global quality scale

Derya Dursun, Rümeysa Bilici Geçer, Sanaz Sadry
- PDF
114-121
Abstract Views: 2747 Download: 559 10.5577/idr2024.545
Antibacterial effects of different low-level doses of double antibiotic paste on multispecies biofilms in regenerative endodontics: A confocal laser scanning microscopy study

Aim: This research aimed to assess the comparative efficacy of various concentrations of double antibiotic paste used on multispecies biofilms in regenerative endodontic procedures. Methodology: Seventy caries-free human teeth with a single root that were extracted for orthodontic purposes were gathered. A total of 900 μL of bacterial suspension was prepared, comprising three bacterial species: E. faecalis (ATCC 43146), A. naeslundii (ATCC 10556), and S. sanguinis (ATCC 29212). Six experimental groups (n=10/group) were randomly created with the infected dentin slices: 0.125 mg/ml, 0.25 mg/ml, 0.5 mg/ml, 1 mg/ml, 5 mg/ml, 10 mg/ml of double antibiotic paste and a control group. Confocal laser scanning microscopy (CLSM) analysis was conducted to evaluate the antimicrobial activity. Two samples from each group were analyzed with a scanning electron microscope. The live/dead bacteria percentages were analyzed via the Kruskal–Wallis test. The tests were conducted with a significance level of 5%. Results: Greater live/dead bacteria ratios were observed in the control group, and the differences compared to other groups were statistically significant. Additionally, the numbers of live/dead bacteria observed after the 0.5 mg/mL and 1 mg/mL DAP doses were applied were significantly higher compared to the 10 mg/mL DAP concentration. All DAP doses exhibited some degree of antibiofilm activity; however, 5 mg/mL and 10 mg/mL were the most effective. Conclusion: In regenerative endodontics, the 5 mg/mL and 10 mg/mL doses of DAP demonstrated more effective activity against multispecies biofilms than lower doses. How to cite this article: Türkoğlu Kayacı Ş, Keleştemur S, Solmazgül Yazıcı Z, Ülger N. Antibacterial effects of different low-level doses of double antibiotic paste on multispecies biofilms in regenerative endodontics: A confocal laser scanning microscopy study. Int Dent Res. 2024;14(3):122-128. https://doi.org/10.5577/intdentres.539

Antibacterial agents, biofilm, regenerative endodontics, regenerative medicine, confocal laser scanning microscopy

Şükriye Türkoğlu Kayacı, Seda Keleştemur, Zeynep Solmazgül Yazıcı, Nurver Ülger
- PDF
122-128
Abstract Views: 1953 Download: 535 10.5577/intdentres.539
Evaluation of the effect of shelf life of different universal bond systems on dentin bonding

Aim: The aim of this study was to investigate changes in dentin bonding caused by the expiry of shelf life of five universal bond systems. Methodology: According to the manufacturer’s instructions, both expired and non-expired samples of five universal bond agents [Prime&Bond (Dentsply), Solare Bond (GC), OptiBond (Kerr), Clearfil S Bond (Kuraray), and G-Premio Bond (GC)] were applied to 10 human teeth. Composite blocks measuring 4–5 mm in thickness were then created on the teeth following the application of the bond. The teeth were cut to obtain samples in the form of square sectioned rods approximately 1.0 × 1.0 mm in width and 8–9 mm in length. These samples were then subjected to microtensile bond strength testing, and the results were statistically analyzed ( p <0.05). Results: When evaluating the difference in microtensile bond strength between expired and non-expired adhesive agent groups of the same brand at different shelf life stages, there was a significant decrease between the Kerr, Clearfil, and G-Premio groups ( p <0.05), while no significant difference was found in the Prime&Bond and Solare groups ( p >0.05). When microtensile bond strength values were assessed among different groups based on shelf life, no significant difference was observed ( p >0.05). Among expired adhesive agents, Solare exhibited the highest microtensile bond strength, while among non-expired adhesive agents, G-Premio showed the highest microtensile bond strength. Conclusion: Universal bond systems should be used in accordance with the manufacturer’s instructions under appropriate storage conditions and considering the shelf life. However, it has been shown that there is no difference in bond strength of universal bond systems within the first six months following the expiration date indicated; they can be used during this period if stored under appropriate conditions. How to cite this article: Bas A, Çelikel P. Evaluation of the effect of shelf life of different universal bond systems on dentin bonding. Int Dent Res. 2024;14(3):129-134. https://doi.org/10.5577/intdentres.579

Bonding agents, shelf life, universal bond system, microtensile bond strength

Aybike Bas, Periş Çelikel
- PDF
129-134
Abstract Views: 1673 Download: 565 10.5577/intdentres.579

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Vol. 14 No. 3 (2024): International Dental Research

Full Issue

Original Article

Evaluation of biomechanical effects of different treatment procedures and materials used in teeth with incomplete root development using finite element analysis

Evaluation of the effects of different surface treatments on the bond strength of recent CAD-CAM hybrid ceramics

YouTube as an information resource for early orthodontic treatment with clear aligners

Antibacterial effects of different low-level doses of double antibiotic paste on multispecies biofilms in regenerative endodontics: A confocal laser scanning microscopy study

Evaluation of the effect of shelf life of different universal bond systems on dentin bonding