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<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" article-type="research-article" dtd-version="1.1d1" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher">Problems of Social Hygiene, Public Health and History of Medicine</journal-id><journal-title-group><journal-title>Problems of Social Hygiene, Public Health and History of Medicine</journal-title></journal-title-group><issn publication-format="print">0869-866X</issn><issn publication-format="electronic">2412-2106</issn><publisher><publisher-name>Joint-Stock Company Chicot</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">314</article-id><article-id pub-id-type="doi">10.32687/0869-866X-2020-28-3-471-475</article-id><article-categories><subj-group subj-group-type="heading"><subject>Научная статья</subject></subj-group></article-categories><title-group><article-title>The morphometric parameters of projection triangle of visceral cranium and infratemporal fossa under various degree of integrity of upper dentition</article-title></title-group><contrib-group><contrib contrib-type="author"><name name-style="western"><surname>Gayvoronsky</surname><given-names>I. V.</given-names></name><bio></bio><email>I.v.gaivoronsky@mail.ru</email><xref ref-type="aff" rid="aff-1"/><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Gayvoronskaya</surname><given-names>M. G.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-1"/><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Tcimbalistov</surname><given-names>A. V.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Ponomarev</surname><given-names>A. A.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-4"/></contrib></contrib-group><aff id="aff-1">The St. Petersburg State University</aff><aff id="aff-2">The Federal State Budget Military Educational Institution of Higher Education “The S. M. Kirov Military Medical Academy”</aff><aff id="aff-3">The Federal State Budget Educational Institution “The V. A. Almazov Federal Medical Research Center of Minzdrav of Russia</aff><aff id="aff-4">The Federal State Autonomous Educational Institution of Higher Education “The Belgorod State National Research University”</aff><pub-date date-type="epub" iso-8601-date="2020-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2020</year></pub-date><volume>28</volume><issue>3</issue><fpage>471</fpage><lpage>475</lpage><history><pub-date date-type="received" iso-8601-date="2021-04-06"><day>06</day><month>04</month><year>2021</year></pub-date></history><permissions><copyright-statement>Copyright © 2020,</copyright-statement><copyright-year>2020</copyright-year></permissions><abstract>In order to study the change in the morphometric parameters of projection triangles of the facial skull during tooth loss in adult patient, 185 categorized skulls were studied from the craniological collection of the Museum of the Department of Normal Anatomy of the Military Medical Academy. The skulls belonged to adults aged from 22 to 75 years and were separated into two groups - with complete set of teeth and complete absence of teeth on the upper jaw (100 and 85 skulls respectively). Based on standard points, the following projection triangles were developed: lateral front triangle, anterior maxillary triangle, lateral maxillary triangle, lateral infratemporal triangle. It was established that the morphometric characteristics of the proposed projection triangles of the facial skull and infratemporal fossa reliably change with tooth loss. In this case, only those sides that pass through the points located on the alveolar process of the upper jaw change. It is proved that the sides drawn through the alveolar point and the most lateral and posterior points on the alveolar process are most affected. The selection of the proposed projection triangles and the study of their features depending on the degree of preservation of the upper dentition is important for planning and anatomical justification of surgical access on the structures of the middle zone of the face.</abstract><kwd-group xml:lang="en"><kwd>facial skull</kwd><kwd>upper jaw</kwd><kwd>midface</kwd><kwd>infratemporal fossa</kwd><kwd>projection triangles</kwd><kwd>tooth loss</kwd><kwd>morphometry</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>лицевой череп</kwd><kwd>верхняя челюсть</kwd><kwd>средняя зона лица</kwd><kwd>подвисочная ямка</kwd><kwd>проекционные треугольники</kwd><kwd>потеря зубов</kwd><kwd>морфометрия</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Nash P. G., Macefield V. G., Klineberg I. J., Gustin S. M., Murray G. M., Henderson L. A. Changes in human primary motor cortex activity during acute cutaneous and muscle orofacial pain. J. 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