.  2021 Dec;25(4):158-169. 10.32542/implantology.2021017.

A Retrospective Study on the Factors Affecting the Early Marginal Bone Loss of Tissue-Level Implants

• Koo SM
• Kang DY
• Hieu PD
• Shin HS
• Park JC

• KMID: 2524042
• DOI: http://doi.org/10.32542/implantology.2021017

Abstract

Purpose
Marginal bone loss (MBL) around dental implants adversely affects long-term implant treatment outcomes. The purpose of this study was to investigate the risk factors of MBL in tissuelevel implants.
Materials and Methods
The study included 42 patients with 69 tissue-level implants placed between May 2015 and January 2020 at the Department of Periodontology of Dankook University Dental Hospital. Patient and implant data were collected f rom medical records and panoramic and periapical radiographs. MBL was measured as the distance f rom the apex of the implant fixture to the most coronal point where the implant and bone meet, and calibration was performed using the actual length of the implant. Student’s t -test was used to compare the groups by age (< 60 or ≥ 60 years), sex (male or female), hypertension status, diabetes status, implant diameter (< 5.0 or 5.0 mm), implant length (7.0 or ≥ 8.5 mm), position of implants (maxilla or mandible), collar height (≤ 2.0 or 2.8 mm), splinted implant prosthesis, and bone graf ting on MBL. One-way ANOVA was used to compare the MBL of the three groups by implant insertion depth less than 0.5 mm, between 0.5 to 1.0 mm, and more than 1.0 mm. The chi-square test for linear trend was used to determine whether the implant insertion depth affected the thread exposure.
Results
There was no statistically significant difference between the groups in terms of sex, age, hypertension, diabetes, diameter, length, location, collar height, splinted implant prosthesis, and bone graf ting. One-way ANOVA showed that the MBL was signif icantly higher in the group with implant insertion depth ≥ 1.0 mm than in the other groups. However, the f requency of thread exposure decreased as the implant insertion depth increased.
Conclusion
There were no statistically significant factors associated with MBL, except for implant insertion depth. As the implant insertion depth increased, the amount of MBL increased, but the f requency of thread exposure decreased.

Keyword

Bone resorption; Dental implants; Retrospective studies