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A total of 30 deep proximal cavities in posterior teeth were randomly assigned into two groups (<jats:italic>n<\/jats:italic>\u2009=\u200915); Thermacut Bur Gingivectomy (TBG) or Functional Crown Lengthening (FCL). Patient Satisfaction using a Visual Analog Scale (VAS) as a primary outcome. Bleeding on Probing (BoP), Probing Depth (PD), and Crestal Bone Level (CBL) as secondary outcomes, and Marginal Integrity using Modified USPHS Criteria as a tertiary outcome, were evaluated at the baseline, immediate postoperative, 6-month, and 1-year follow-up intervals. There was a statistically significant difference between the two groups regarding patient satisfaction in the immediate postoperative values, no statistically significant difference was found in the 6-month and 12-month intervals. Regarding BoP, no statistical significance was found between intervention and control groups at different time intervals. Regarding PD, Pre- and after 6 months, there was no significant difference in values measured in both groups, after 1 year, values measured in the intervention group were statistically significant, Regarding CBL, there was no significant difference in bone levels measured in both groups at baseline. However, in other intervals, values measured in the control group were significantly higher than those in the intervention group. Regarding Marginal Integrity, no significant differences were found between both groups at any time interval. Both Thermacut bur gingivectomy and functional crown lengthening techniques are valid treatments for the management of deep subgingival interproximal carious lesions in vital teeth. However, Thermacut bur was superior to functional crown lengthening in terms of preserving the alveolar bone crest. <jats:bold>Clinical Significance<\/jats:bold>: Thermacut bur gingivectomy is an alternative to solve the shortcomings of functional crown lengthening.<\/jats:p>","DOI":"10.1038\/s41598-025-99313-0","type":"journal-article","created":{"date-parts":[[2025,5,8]],"date-time":"2025-05-08T11:10:38Z","timestamp":1746702638000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Thermacut bur gingivectomy versus functional crown lengthening in management of subgingival interproximal carious lesions 12 months randomized controlled trial"],"prefix":"10.1038","volume":"15","author":[{"given":"Ahmed Khairy","family":"Elmorsy","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1047-124X","authenticated-orcid":false,"given":"Shereen Hafez","family":"Ibrahim","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hani Mohamed Essam","family":"El-Nahass","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nesma","family":"Shemais","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ahmed El","family":"Zohairy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,5,8]]},"reference":[{"issue":"1","key":"99313_CR1","first-page":"50","volume":"5","author":"M Veneziani","year":"2010","unstructured":"Veneziani, M. 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Written informed consent with an easy Arabic language as mother language of participants was signed by the recruited participants to permit the use of the clinical photos and other investigation data.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval and consent to participate"}},{"value":"The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient(s) has\/have given his\/her\/their consent for his\/her\/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published, and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed. Written informed consent with an easy Arabic language as mother language of participants was signed by the participant to permit the use of the clinical photos and other investigation data. All authors read and approved the submission and publication.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}}],"article-number":"16063"}}