Browsing by Autor "Rodrigo Oyonarte"

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Mechanical Properties of Thermoformed and Direct- Printed Aligner Materials After Immersion in 37 °C Water: A 14-Day In Vitro Study
(2025) Rodrigo Oyonarte; Isabel Lagos; F. L.; С. Б. Цыбенова; Alberto Real; Seung Soon Jang; Hi Won Jeong; Jiho Lee; Jin Hong Min; Tarek M. Elshazly
<title>Abstract</title> This study compared the mechanical properties of direct-printed dental aligner materials made from 3D-printed resins TC-85, TR-07, and TA-28 with those of two conventional thermoformed materials—Zendura-A and Zendura-Flx—to evaluate their performance under simulated physiological conditions. Test specimens were immersed in a 37°C water bath for 12 different durations: 0, 5, and 30 min; 1, 3, 6, and 9 h; and 1, 3, 7, and 14 d. Tensile tests were performed using a universal testing machine (Zwick Z010, Zwick, Ulm, Germany) to measure the Young’s modulus (MPa), elongation at break (%), and tensile force (N) at strains of 1%, 2%, and 3%. After 14 d of immersion, TC-85, TA-28, and TR-07 exhibited forces in the range of 4.04–7.24 N at 1% strain and 7.30–13.48 N at 3% strain, while Zendura A and Zendura FLX exhibited forces of 26.26–32.91 N at 1% strain and 32.91–65.23 N at 3% strain. The Young’s modulus and UTS results exhibit a trend similar to that of the tensile force. Direct-printed aligners exhibited a 25.3% (TC-85) increase in elongation at break after 30 min, whereas thermoformed aligners exhibited a 5.5% reduction. Direct-printed resins, such as TC-85, TA-28, and TR-07, with temperature-responsive viscoelastic behavior, exhibited statistically significant differences from thermoformed aligner materials, delivering lower mechanical loads that could favor a more suitable orthodontic force profile for clear aligners.
Orthodontic Movement After Regenerative Endodontic Procedure in Mature Permanent Tooth Associated With Dens Invaginatus: A Case Report With 3-year Follow-Up
(2024) I. Ruiz Martínez; Rodrigo Oyonarte; Guillermo Concha; Claudia Brizuela
<title>Abstract</title> Background Regenerative endodontic procedures (REPs) are innovative treatments aimed at restoring damaged dental structures. However, the effect of orthodontic movement on REP-treated teeth is not well understood and may have significant long-term consequences. This study aimed to evaluate the impact of orthodontic movement on a mature permanent tooth associated with dens invaginatus that has undergone a regenerative endodontic procedure (REP). Case presentation: This case involves a preliminary investigation into the effects of orthodontic movements on a mature REP-treated tooth. This could have the potential to enrich our collective understanding and guide treatment planning, leading to the development of clinical guidelines. This report describes the case of a 13-year-old male with a noncontributory medical history who presented with pulp necrosis and a chronic apical abscess (tooth number 2.2). Following REP according to the American Association of Endodontists' guidelines, the patient began orthodontic treatment after 9 months. Subsequent follow-ups at 9 months, 2 years, and 3 years post-REP revealed an asymptomatic state with minimal cervical discolouration and diminished cold sensitivity. Radiographic analyses revealed periapical healing, dentin wall thickening, and consistent root length. The treated tooth displayed a positive response to both REP and orthodontic treatment, yet further research is necessary to determine the long-term effects of orthodontic forces on REP-treated teeth. Conclusion Our findings suggest that orthodontic movement following REPs in mature permanent teeth is feasible and may also act as a protective factor against apical root resorption. Our experience indicates that a 9-month healing period permits successful orthodontic outcomes following REPs. Nonetheless, the predictability of outcomes and the ideal healing period before orthodontic movement is initiated remain to be established.