{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T12:24:14Z","timestamp":1786969454621,"version":"build-2736575974"},"reference-count":39,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T00:00:00Z","timestamp":1786924800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Iuliu Ha\u021bieganu University of Medicine and Pharmacy"},{"id":[{"id":"https:\/\/ror.org\/051h0cw83","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Funct. Biomater.","JFB"],"abstract":"<jats:p>Background: This in vitro study compared the effectiveness of polytetrafluoroethylene (PTFE) tape and a conventional cotton retraction cord for gingival displacement and evaluated the mechanical and microstructural characteristics of PTFE tape. Methods: Eight standardized prepared teeth with artificial gingiva were evaluated under three conditions: control, cotton retraction cord, and PTFE tape. After each condition, impressions were digitized using a CAD\/CAM system. Sulcular width was measured at four predefined locations and averaged for statistical analysis. PTFE tape was also evaluated by tensile testing before and after sterilization and by scanning electron microscopy (SEM). Results: Mean sulcular widths were 0.716 \u00b1 0.118 mm (control), 0.851 \u00b1 0.140 mm (cotton cord), and 0.907 \u00b1 0.099 mm (PTFE). Repeated-measures ANOVA showed a significant effect of the displacement method (p &lt; 0.001), with PTFE producing significantly greater sulcular enlargement than cotton cord. Qualitative SEM analysis revealed a more homogeneous impression surface morphology following PTFE removal. Sterilization did not significantly affect the tensile properties or microstructural integrity of PTFE tape. Conclusions: Under standardized in vitro conditions, PTFE tape produced the highest gingival sulcular enlargement and maintained favorable mechanical and microstructural properties, supporting its potential as an alternative gingival displacement material. Further clinical studies are required to confirm these findings.<\/jats:p>","DOI":"10.3390\/jfb17080408","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T11:00:05Z","timestamp":1786964405000},"page":"408","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Evaluation of Polytetrafluoroethylene (PTFE) Tape for Gingival Displacement Using CAD\/CAM Analysis and Scanning Electron Microscopy (SEM)"],"prefix":"10.3390","volume":"17","author":[{"given":"Laura Monica","family":"Rusu","sequence":"first","affiliation":[{"name":"Dental Materials Discipline, Department of Prosthodontics and Dental Materials, Faculty of Dental Medicine, \u201cIuliu Ha\u021bieganu\u201d University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Pop","sequence":"additional","affiliation":[{"name":"Dental Materials Discipline, Department of Prosthodontics and Dental Materials, Faculty of Dental Medicine, \u201cIuliu Ha\u021bieganu\u201d University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9812-695X","authenticated-orcid":false,"given":"Stanca","family":"Cuc","sequence":"additional","affiliation":[{"name":"\u201cRaluca Ripan\u201d Institute of Research in Chemistry, \u201cBabe\u0219 Bolyai\u201d University, 400294 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mircea Aurelian","family":"Rusu","sequence":"additional","affiliation":[{"name":"Department of Manufacturing Engineering, Machine Building, Technical University of Cluj-Napoca, 400641 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2417-2651","authenticated-orcid":false,"given":"Sorina","family":"Sava","sequence":"additional","affiliation":[{"name":"Dental Materials Discipline, Department of Prosthodontics and Dental Materials, Faculty of Dental Medicine, \u201cIuliu Ha\u021bieganu\u201d University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anca","family":"Labunet","sequence":"additional","affiliation":[{"name":"Dental Materials Discipline, Department of Prosthodontics and Dental Materials, Faculty of Dental Medicine, \u201cIuliu Ha\u021bieganu\u201d University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cristina","family":"Iosif","sequence":"additional","affiliation":[{"name":"Dental Materials Discipline, Department of Prosthodontics and Dental Materials, Faculty of Dental Medicine, \u201cIuliu Ha\u021bieganu\u201d University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2573-8592","authenticated-orcid":false,"given":"Adriana","family":"Objelean","sequence":"additional","affiliation":[{"name":"Dental Materials Discipline, Department of Prosthodontics and Dental Materials, Faculty of Dental Medicine, \u201cIuliu Ha\u021bieganu\u201d University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/0022-3913(90)90144-2","article-title":"Gingival esthetics","volume":"64","author":"Goodacre","year":"1990","journal-title":"J. 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