Changes in mucogingival junction after an apically positioned flap with collagen matrix at sites with or without previous guided bone regeneration: A prospective comparative cohort study

Kyung A. Ko, Jung Seok Lee, Jang Hyun Kim, Ji Man Park, Reinhard Gruber, Daniel S. Thoma

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Aim: To assess changes in the position of the mucogingival junction (MGJ) after an apically positioned flap (APF) with collagen matrix performed at sites with or without previous guided bone regeneration (GBR). Materials and Methods: Dental implants were placed with or without GBR (group GBR or non-GBR) depending on the available ridge width in 30 patients with a limited width of keratinized mucosa (MGJ placed more coronally than the expected prosthetic margin). An apically positioned flap with collagen matrix was performed in both groups. Changes in the position of the MGJ from the day of an apically positioned flap up to 1, 3, and 12 months thereafter were assessed on digital scans (primary endpoint). Secondary endpoints were the width and thickness of the keratinized mucosa, and the position of the mucosal margin. Results: The position of the MGJ changed significantly from baseline to the first month, by 5.25 ± 2.10 and 4.40 ± 1.41 mm in groups GBR and non-GBR, respectively. Thereafter, the position remained stable in both groups up to 1 year (changes from baseline of 5.46 ± 2.28 and 4.58 ± 1.92 mm, respectively; p =.34). The position of the mucosal margin did not differ between groups GBR and non-GBR (–1.57 ± 2.04 and –1.75 ± 2.08 mm, respectively; p =.84), nor did the width of the keratinized mucosa (1.20 ± 1.03 and 0.99 ± 0.66 mm, p =.91) or its thickness (1.28 ± 0.44 and 1.40 ± 0.78 mm, p =.87). Conclusion: Apically positioned flap combined with a collagen matrix results in a more apical position of the MGJ at sites with or without GBR. Following a coronal shift during the first month after the apical positioning of the flap, the level of the MGJ remained stable.

Original languageEnglish
Pages (from-to)1199-1206
Number of pages8
JournalClinical Oral Implants Research
Volume31
Issue number12
DOIs
Publication statusPublished - 2020 Dec

Bibliographical note

Funding Information:
This study was supported by a fund from Geistlich Pharma AG and the National Research Fund of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF‐2019R1A2C4069942).

Funding Information:
This study was supported by a fund from Geistlich Pharma AG and the National Research Fund of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2019R1A2C4069942).

Publisher Copyright:
© 2020 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd

All Science Journal Classification (ASJC) codes

  • Oral Surgery

Fingerprint

Dive into the research topics of 'Changes in mucogingival junction after an apically positioned flap with collagen matrix at sites with or without previous guided bone regeneration: A prospective comparative cohort study'. Together they form a unique fingerprint.

Cite this