| Summary: | 碩士 === 國立臺灣大學 === 臨床牙醫學研究所 === 107 === Research Goals
This study was designed for evaluating dental implant placement on the edentulous ridge with height discrepancy. The primary goal was to validate that the implant thread exposure on the ridge with height discrepancy was reduced by installing sloped-configured implants. The secondary goal was to evaluate the influence of implant stability and periodontal clinical parameters of adjacent teeth after sloped-configured implant installation.
Material and Methods
This single center randomized clinical trial recruited patients with prospective implant sites which presented ≥1 mm buccal-lingual ridge height discrepancy from the cone beam computed tomography (CBCT). Sites were randomly assigned to receive either received standard implants (control group) or sloped-configured implants (test group). Adjunctive guided bone regeneration was performed to ensure the full coverage of implant threads.
CBCT and periodontal clinical parameters assessments were performed at baseline. Thread exposure and implant stability quotient (ISQ) were measured immediately after implant installation. Thread exposure, ISQ and periodontal clinical parameters were assessed 6 months after implant placement.
Results
19 patients with 30 dental implants were included (17 standard implants and 13 sloped-configured implants). At baseline, the ridge height discrepancies were 1.84±0.73 mm and 1.85±0.58 mm in the control and test groups. After implant installation, thread exposure was significantly reduced in the test group (0.62±0.96 mm) relative to control (1.59±1.23 mm; p<0.05), and the prevalence of thread exposure was 70.59% and 38.46% of the control and test groups. After 6 months, thread exposure was 0.35±0.49 mm and 0.08±0.28 mm in the control and test groups, and the prevalence of thread exposure was 35.29% and 7.69% respectively.
The ISQ value showed no significant difference between two groups at implant placement and 6 months after implant placement. The gingival index at baseline was significantly higher in the test group relative to that in control. All the other periodontal clinical parameters showed no significant difference between two groups at baseline and 6 months after implant placement.
Conclusions
Compared with the standard implants, sloped-configurated implants could reduce both the amount and prevalence of thread exposure for the cases with ridge discrepancy.
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