Retrospective Clinical Study of Marginal Bone Level Changes with Two Different Screw-Implant Types: Comparison Between Tissue Level (TE) and Bone Level (BL) Implant

Abstract

Aim The objective of this retrospective cohort study was to compare the amount of marginal bone loss (MBL) in a bonelevel and a soft-tissue-level implant system, both of which have similar intra-bony shape and surface composition. A subgroup analysis was done to compare the amount of MBL of each implant type in relation to the different vertical placement within the respective groups of implants. Materials and Methods Records of all patients who underwent implantation for replacement of teeth using comparable bone level (BL) and soft tissue level implants (TE) from 1st January 2006 to 31st December 2009 were scrutinized. Initial depth of implant placement (IDIP) was measured for all implants. Marginal bone loss was measured in patients whose records were available at time point corresponding to 12, 24 and 36 months post insertion. Results Out of a total of 384 implants, 337 implants were included for study. The mean MBL for the BL implants were 0.3, 0.38, 0.48 and for TE implant were 0.6, 0.54 and 0.93 for time periods 12, 24 and 36 months respectively.Although there was no statistically significant difference between the two groups at time periods at 6-12 months, in later time periods, there was a slightly greater amount of MBL around TE implants as compared to BL implants (p \ 0.001). When comparing the IDIP and MBL in the same implant type, there was a statistically significant (p \ 0.001) positive correlation between the depth of implant placement and the amount of MBL, with deeper placed implants having more bone loss. Conclusion Within the limitations of this retrospective cohort study design, one can conclude that BL implants had statistically significant lesser MBL as compared to TE in time periods above 12 months. Although the difference is statistically significant, the difference may not be clinically significant. The IDIP had an influence on the amount of MBL, with deeper placed implants and screw structure of the implant placed below the bone, having more MBL in the period of study.

Diagnostic Principles of Peri-Implantitis: a Systematic Review and Guidelines for Peri-Implantitis Diagnosis Proposal

“…No significant differences in bone loss were detected. Contradictorily, the clinical retrospective cohort study that aimed to compare the amount of marginal bone loss in bone- level and soft-tissue-level implant systems found no statistically significant difference between the two groups at time periods of 6 - 12 months, but in later time periods there was a slightly greater amount of marginal bone loss around tissue-level implants compared to bone-level implants [48]. …”

Clinical and Radiological Long‐Term Outcome of a Tapered Implant System with Special Emphasis on the Influence of Augmentation Procedures

“…However, if the radiograph is of high quality, Persson and colleagues and Akesson described the orthopantomogram as examination of choice for the evaluation of the marginal bone level around teeth. In the literature, peri‐implant bone resorption for the same tapered implant system ranged between 0.4 mm and 0.93 mm with a follow‐up between 16 and 60 months (Table ), indicating promising results concerning marginal bone stability . In a recent review, Abrahamsson and colleagues indicated that controlled prospective studies examining the effect of implant surface and designs on peri‐implant bone resorption with a follow‐up of ≥3 years are rare.…”

“…In the literature, peri-implant bone resorption for the same tapered implant system ranged between 0.4 mm and 0.93 mm with a follow-up between 16 and 60 months ( Table 2), indicating promising results concerning marginal bone stability. 28,32,46 In a recent review, Abrahamsson and colleagues 47 indicated that controlled prospective studies examining the effect of implant surface and designs on peri-implant bone resorption with a follow-up of 33 years are rare. One study showed significantly improved marginal bone preservation for implants with a conical and micro-threaded marginal collar compared with implants with a cylindrical and nonthreaded marginal portion after 3 years in function.…”

Sub-Periosteal Dissection with Denture-Guided Epithelial Regeneration: A Novel Method for Peri-Implant Soft Tissue Management in Reconstructed Mandibles

“…Additionally, since the dentures are removable, this greatly helps in oral hygiene maintenance and prevents malodor. The use of tissue level implants provides easier access to the abutment platform, which improves operator comfort as well as patient maintenance in such cases [23].…”