Volumetric variation of peri-implant soft tissues in convergent collar implants and crowns using the biologically oriented preparation technique (BOPT)

• Guillermo Cabanes-Gumbau ^[1] ; Agustín Pascual-Moscardó ^[2] ; David Peñarrocha-Oltra ^[3] ; Berta García-Mira ^[4] ; Javier Aizcorbe-Vicente ^[5] ; María Peñarrocha-Diago ^[6]
  1. [1] MD, DDS, MS, PhD. Collaborating Professor of the Master of Oral Surgery and Implantology. Valencia University Medical and Dental School. Valencia, Spain
  2. [2] DDS, MS, PhD. Assistant Professor of Dental Materials. Valencia University Medical and Dental School. Valencia, Spain
  3. [3] DDS, MS, PhD. Collaborating Professor and Doctor of Oral Surgery. Valencia University Medical and Dental School. Valencia, Spain. Investigator of the Patología y Terapéutica Odontológica y Maxilofacial group of the Instituto de Investigación Biomédica de Bellvitge (IDIBELL). Barcelona, Spain
  4. [4] DDS, MS, PhD. Collaborating Professor and Doctor of Oral Surgery. Valencia University Medical and Dental School. Valencia, Spain
  5. [5] DDS. Resident of the Master of Oral Surgery and Implantology. Valencia University Medical and Dental School. Valencia, Spain
  6. [6] DDS, MS, PhD. Assistant Professor of Oral Surgery. Valencia University Medical and Dental School. Valencia, Spain. Investigator of the Patología y Terapéutica Odontológica y Maxilofacial group of the Instituto de Investigación Biomédica de Bellvitge (IDIBELL). Barcelona, Spain

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• Localización: Medicina oral, patología oral y cirugía bucal. Ed. inglesa, ISSN-e 1698-6946, Vol. 24, Nº. 5 (September), 2019
• Idioma: inglés
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• Resumen

  • To evaluate the changes in the peri-implant soft tissues of convergent collar implants with biologically oriented preparation technique (BOPT) crowns, 10 months after loading.

    A pilot study was carried out from January 2016 to October 2017 involving 14 patients with one or two implants in the posterior mandibular sector. A total of 32 convergent collar implants were placed using a non-submerged protocol. Three months later the provisional cemented crowns were fitted using the BOPT approach with the finish line 1-1.5 mm below the gingival margin, simulating coronal emergence of a natural tooth. The soft tissue changes were measured with an intraoral scanner at two different timepoints: a) on the day of provisionalization, before prosthetic loading; and b) 10 months later without the provisional prosthesis. The STL files were superimposed and the soft tissue changes were recorded using a color scale with measurement of the volumetric changes in mm3.

    A mean increase in peri-implant mucosal volume of 64.7 mm3 was observed in 29 implants. The zones with the greatest increase in soft tissue volume were the papillae of implants with adjacent teeth and the peri-implant buccal margin. Three implants showed a mean decrease in soft tissue volume of -25.1 mm3.

    The fitting and design of crowns using the biologically oriented preparation technique (BOPT) over convergent collar implants affords a significant increase in peri-implant soft tissue volume both at the level of the papillae and in the buccal margin.