<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root>
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Dentistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Dentistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский стоматологический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1728-2802</issn><issn publication-format="electronic">2413-2934</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">681671</article-id><article-id pub-id-type="doi">10.17816/dent681671</article-id><article-id pub-id-type="edn">JGHYAC</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original Study Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные исследования</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Influence of root wall thickness on stress distribution in dentin following endodontic treatment</article-title><trans-title-group xml:lang="ru"><trans-title>Роль толщины стенок корня в распределении напряжений в дентине после эндодонтического лечения</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0380-0575</contrib-id><contrib-id contrib-id-type="spin">4291-2151</contrib-id><name-alternatives><name xml:lang="en"><surname>Nekrasova</surname><given-names>Ekaterina A.</given-names></name><name xml:lang="ru"><surname>Некрасова</surname><given-names>Екатерина Андреевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>ekaterina233@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4511-6317</contrib-id><contrib-id contrib-id-type="spin">5767-9158</contrib-id><name-alternatives><name xml:lang="en"><surname>Olesova</surname><given-names>Emilia A.</given-names></name><name xml:lang="ru"><surname>Олесова</surname><given-names>Эмилия Артёмовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>emma.olesova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9825-4935</contrib-id><contrib-id contrib-id-type="spin">5304-9137</contrib-id><name-alternatives><name xml:lang="en"><surname>Glazkova</surname><given-names>Elena V.</given-names></name><name xml:lang="ru"><surname>Глазкова</surname><given-names>Елена Валерьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine), Associate Professor</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент</p></bio><email>pozharskaya_lena@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9165-2554</contrib-id><contrib-id contrib-id-type="spin">8924-3520</contrib-id><name-alternatives><name xml:lang="en"><surname>Olesov</surname><given-names>Egor E.</given-names></name><name xml:lang="ru"><surname>Олесов</surname><given-names>Егор Евгеньевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Professor</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор</p></bio><email>olesov_georgiy@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">State Research Center—Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency</institution></aff><aff><institution xml:lang="ru">Государственный научный центр Российской Федерации — Федеральный медицинский биофизический центр имени А.И. Бурназяна</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-07-09" publication-format="electronic"><day>09</day><month>07</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2025-08-29" publication-format="electronic"><day>29</day><month>08</month><year>2025</year></pub-date><volume>29</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>340</fpage><lpage>344</lpage><history><date date-type="received" iso-8601-date="2025-05-30"><day>30</day><month>05</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-23"><day>23</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Эко-Вектор</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2028-08-29"/></permissions><self-uri xlink:href="https://rjdentistry.com/1728-2802/article/view/681671">https://rjdentistry.com/1728-2802/article/view/681671</self-uri><abstract xml:lang="en"><p><bold><italic>BACKGROUND:</italic></bold> Predicting complications such as root fractures or cracks necessitates investigation of stress distribution in tooth roots under various biomechanical conditions, particularly with alterations in dimensional and mechanical properties of the tooth.</p> <p><bold><italic>AIM:</italic></bold> This study aimed to model functional stress distribution in the root of a devitalized tooth using three-dimensional mathematical simulation based on varying dentin wall thickness.</p> <p><bold><italic>METHODS:</italic></bold> A mathematical modeling approach was used to analyze the magnitude and distribution of stresses in the root of a devitalized tooth under an oblique load of 150 N at a 30°. The study compared stress levels across three tooth models with root wall thicknesses of 1.0 mm, 1.5 mm, and 2.0 mm.</p> <p><bold><italic>RESULTS:</italic></bold> A direct relationship was established between decreasing root wall thickness and increasing stress levels in dentin of devitalized teeth. This effect was most pronounced in the model with a 1.0-mm wall, where stresses approached the ultimate strength of dentin. Stress distribution patterns revealed the cervical region as the site of maximum concentration.</p> <p><bold><italic>CONCLUSION:</italic></bold><bold> </bold>Reduced dentin wall thickness in devitalized teeth leads to increased functional stress, with peak values localized in the cervical region. Root dentin with a thickness of 1.0 mm may be subjected to stresses exceeding its structural integrity.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование.</bold> Прогнозирование возможных осложнений в виде перелома и трещины корня зуба делает актуальным изучение распределения напряжений в корне зуба в разных биомеханических обстоятельствах, в частности при изменениях размерных и механических параметров зуба.</p> <p><bold>Цель.</bold> Трёхмерное математическое моделирование функциональных напряжений в корне зуба в зависимости от толщины дентинной стенки.</p> <p><bold>Методы.</bold> С использованием математического моделирования проведён анализ величины и распространения напряжений в корне девитализированного зуба под наклонной нагрузкой 30 ° усилием 150 Н. Для целей данного исследования сравнивали напряжения в трёх моделях зуба: с толщиной стенки корня 1,0; 1,5 и 2,0 мм.</p> <p><bold>Результаты.</bold> Установлена закономерность увеличения напряжений в дентине девитализированного зуба в зависимости от уменьшения толщины стенки корня. Особенно указанная закономерность проявляется при моделировании стенки корня толщиной 1,0 мм, где напряжения становятся предельными для прочности дентина. Картины распределения напряжений показывают локализацию максимальных величин в области шейки зуба.</p> <p><bold>Заключение. </bold>Получено доказательство увеличения функциональных напряжений в дентине девитализированного зуба при уменьшении толщины стенки корня. Выявлена основная локализация максимальных напряжений — шейка зуба. Установлено, что девитализированный дентин подвержен напряжениям сверх предела прочности при толщине корня 1,0 мм.</p></trans-abstract><kwd-group xml:lang="en"><kwd>tooth root</kwd><kwd>dentin thickness</kwd><kwd>mathematical modeling</kwd><kwd>functional stress</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>корень зуба</kwd><kwd>толщина дентина</kwd><kwd>математическое моделирование</kwd><kwd>функциональные напряжения</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Aksamit LA, Arutjunov SD, Atrushkevich VG, et al, Therapeutic dentistry: National guidelines. 2nd edition. Dmitrieva LA, Maksimovskij JuM, editors. Мoscow: GJeOTAR-Media; 2015. (In Russ.) EDN: VCUWPT</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Akulovich AV, Anisimova EN, Anisimova NJu, et al. Orthopedic dentistry: National guidelines. Lebedenko IJu, Arutjunov SD, Rjahovskij AN, editors. Мoscow: GJeOTAR-Media; 2022. (In Russ.) doi: 10.33029/9704-6367-3-OD2-2022-1-416 EDN: ULMYYK</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Olesova EA, Ilyin AA, Arutyunov SD, et al. Risk factors for the appearance of cracks and fractures of teeth according to a survey of dentists. Russian Journal of Dentistry. 2024;28(6):562–568. doi: 10.17816/dent634360 EDN: HFEBPX</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Tabulated values of physical and mechanical properties. Appendix A. In: O’Brien WJ, editor. Dental materials and selection. 3nd edition. Chicago, Berlin, London, Tokyo, Paris, Barcelona, Sao Paolo, Moscow, Prague, Warsaw; 2022. P. 503.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Muslov SA, Arutjunov SD. Mechanical properties of teeth and periodontal tissues. Мoscow: Izdatel’skij dom «Prakticheskaja medicina»; 2020. 256 с. (In Russ.) EDN: ITZXLG</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Olesova EA, Ilyin AA, Em AV, et al. Effect of biomechanical load factors on the stress-strain state of teeth and underlying bone tissue. Russian Journal of Dentistry. 2024;28(5):462–468. doi: 10.17816/dent634253 EDN: HVIETH</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Rozov RA, Trezubov VN, Gvetadze RSh, et al. Experimental design of the lower jaw functional loading for implant-supported restoration in unfavorable clinical conditions. Stomatology. 2022;101(6):28–34. doi: 10.17116/stomat202210106128 EDN: KKPPHB</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Zaslavsky RS, Olesova VN, Povstyanko YuA, et al. Three-dimensional mathematical modeling of functional stresses around a dental implant in comparison with a single-root tooth. Russian Bulletin of Dental Implantology. 2022;(3-4):4–10. EDN: JHRTIG</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Abakarov SI, Sorokin DV, Lapushko VYu, Abakarova SS. Stress-deformed state of a non-removable prosthesis on implants under mustering load depending on the angle of abutment wall tilt. Clinical Dentistry (Russia). 2023;26(1):147–157. doi: 10.37988/1811-153X_2023_1_147 EDN: KBFJYD</mixed-citation></ref></ref-list></back></article>
