Skip to main content
eScholarship
Open Access Publications from the University of California

UCLA

UCLA Electronic Theses and Dissertations bannerUCLA

The Effect of Implant Thread Design on Implant Stability in the Early Post-operative Period

  • Author(s): McCullough, Jeffrey
  • Advisor(s): Klokkevold, Perry
  • et al.
Abstract

Available literature suggests that there is a transient drop in implant stability from approximately week 0 to week 3-4 as a result of bone remodeling around the implant as it transitions from a primary, mechanical stability to a secondary, biologic stability. Minimal research has been conducted investigating the potential influence of macrothread design on this process.

Objective: to determine the role of macrothread design on implant stability in the early post-operative healing period through the use resonance frequency analysis (RFA).

Methods: 7 patients, each missing at least two posterior teeth in the same arch, were included in the study, resulting in 10 matched pairs available for analysis. All sites were healed sites (> 6 months post-extraction) with sufficient bone volume for implant placement and no history of prior augmentation. Each site in a matched pair was randomly selected to receive either the control implant (Megagen EZPlus Internal) or the test implant (Megagen AnyRidge). The test implant incorporates a novel thread design which includes rounded, non-cutting edges, wide thread depth, and increased thread pitch compared to a conventional thread design. Implants were placed using a standardized drilling protocol. RFA was used to determine implant stability quotient (ISQ) values for each implant at the time of placement and weekly for the first 8 weeks.

Results: Surgical placement of implants and subsequent healing was uneventful in all cases. At insertion, implants consistently achieved a relatively high insertion torque (30-45 Ncm-1) and high initial ISQ value (79.8 +/- 1.49). Similar baseline ISQ values were found for the test (AR; 79.55 +/- 1.61) and control (EZ; 80.05 +/- 1.37) implants. A general pattern of mean stability in mean ISQ values from baseline across all eight follow-up evaluations was seen for the test implant. A pattern of decreasing ISQ values was seen across the follow-up evaluations for the EZ implant up to week four, where the value plateaued. There was a statistically significant main effect due to implant type (p<0.01). The main effect for time was not statistically significant (p=0.21). However, there was a statistically significant interaction between implant type and time (p<0.01), indicating that the test and control implants performed differently at certain time points.

Conclusions: Within the limitations of this study, macrothread design does appear to play a role in implant stability in the early post-operative healing period as assessed by RFA. These findings may have important implications related to immediate or early loading protocols.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View