Wennstrôm et al. conducted a 5-10 years follow-up study with implants which possessed less than 2 mm keratinized gingival tissue. In this study he concludes that the width of keratinized gingival tissue, or the mobility found in soft tissues are not essential to the preservation of tissue surrounding the implant.
Por otra parte Wennström y col., hacen un seguimiento de 5-10 años de implantes con menos de 2 mm de encía queratinizada y concluye que el ancho de encía queratinizada, o la movilidad de los tejidos blandos, no es esencial para preservar la salud periimplantar.