Objectives: The objective of this study is compare the rate of marginal bone resorption around hydroxyapatite-coated implants given different loading times in order to evaluate their stability. Materials and Methods: The study was conducted retrospectively for one year, targeting 41 patients whose t...
Objectives: The objective of this study is compare the rate of marginal bone resorption around hydroxyapatite-coated implants given different loading times in order to evaluate their stability. Materials and Methods: The study was conducted retrospectively for one year, targeting 41 patients whose treatment areas were the posterior maxilla and the mandible. Osstem TS III HA (Osstem Implant Co., Busan, Korea) and Zimmer TSV-HA (Zimmer Dental, Carlsbad, CA, USA), which employ the new hydroxyapatite coating technique, were used. The patients were divided into two groups - immediate and delayed loading - and the bone level at the time of loading commencement and after one year of loading was measured using periapical radiography. Differences between the groups were evaluated using Mann-Whitney (${\alpha}$=0.05). Results: For all patients as a single group, the survival rate of the implants was 100%, and the mean marginal bone loss was $0.26{\pm}0.59mm$. In comparison of the differences by loading, mean marginal bone loss of $0.32{\pm}0.69mm$ was recorded for the immediate loading group whereas the delayed loading group had mean marginal bone loss of $0.16{\pm}0.42mm$. However, the difference was not significant (P>0.05). Conclusion: Within the limited observation period of one year, predictable survival rates can be expected when using immediately loaded hydroxyapatite-coated implants.
Objectives: The objective of this study is compare the rate of marginal bone resorption around hydroxyapatite-coated implants given different loading times in order to evaluate their stability. Materials and Methods: The study was conducted retrospectively for one year, targeting 41 patients whose treatment areas were the posterior maxilla and the mandible. Osstem TS III HA (Osstem Implant Co., Busan, Korea) and Zimmer TSV-HA (Zimmer Dental, Carlsbad, CA, USA), which employ the new hydroxyapatite coating technique, were used. The patients were divided into two groups - immediate and delayed loading - and the bone level at the time of loading commencement and after one year of loading was measured using periapical radiography. Differences between the groups were evaluated using Mann-Whitney (${\alpha}$=0.05). Results: For all patients as a single group, the survival rate of the implants was 100%, and the mean marginal bone loss was $0.26{\pm}0.59mm$. In comparison of the differences by loading, mean marginal bone loss of $0.32{\pm}0.69mm$ was recorded for the immediate loading group whereas the delayed loading group had mean marginal bone loss of $0.16{\pm}0.42mm$. However, the difference was not significant (P>0.05). Conclusion: Within the limited observation period of one year, predictable survival rates can be expected when using immediately loaded hydroxyapatite-coated implants.
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제안 방법
Both the IL group and DL group visited our hospital on the initial day of loading and 1 year later for periapical radiography and to evaluate the clinical symptoms, mobility of implant, radiolucency around the implant, and status of soft tissue to determine the implants’ survival rate.
대상 데이터
In this study, all surgeries and prosthesis treatments were performed by 1 surgeon and 1 prosthodontist. Implants were placed according to each manufacturer’s guidelines, and bone graft was performed when a small defect around the implant was noted.
The 1-year retrospective study involved a total of 41 patients (74 implants, 22 males and 19 females with mean age of 53.10±10.70) who had 1 or 2 implants placed consecutively in their posterior maxilla or mandible and immediate or delayed loading between September 2010 and April 2011.
데이터처리
After placing the HA-coated implants, data was examined to determine whether there is significant relationship between initial loading time, initial loading time by implant system, initial loading time by maxilla and mandible, and change of crestal bone’s height after 1 year of loading using Mann-Whitney (α=0.05) of IBM SPSS Statistics ver. 20.0.0 (IBM Co., Armonk, NY, USA).
성능/효과
3) Regarding bone loss of the IL group and delayed group receiving the Osstem TS III HA, bone loss was 0.52±1.00 mm and 0.11±0.20 mm, respectively, but the difference was not statistically significant (P =0.556).
4) For patients receiving the Zimmer TSV-HA, bone loss of the IL group and DL group was 0.17±0.21 mm and 0.17± 0.21 mm, respectively, but the difference was not statistically significant (P =0.338).
5) In comparing the bone loss of IL group and DL group in the maxilla and the mandible, bone loss in the maxilla was 0.41±0.82 mm and 0.10±0.16 mm in the IL group and DL group, respectively, but the difference was not statistically significant (P=0.526).
6) Likewise, in the mandible, bone loss of the IL group was 0.27±0.61 mm, and that of the DL group was 0.39±0.84 mm; the difference was not statistically significant (P=0.620).
Initial stability following implantation was not measured in all cases using Ostell Mentor (Integration Diagnostics AB, Göteborg, Sweden) or others; neither were bone resorption rates by type of prosthesis compared because we reviewed medical records and radiographs of patients who had previously received implant treatment. Another limitation of this study was its insufficient control of statistical data because each patient received a different number of implants; the location of implant placement and its length and diameter also differed. The results of this study demonstrated no significant difference, but this may be due to a number of factors in this study design.
Considering the fact that the crystallization rate of the Steri-Oss implant (Nobel Biocare AB, Göteborg, Sweden) is 73.3%, both products used in this study have high crystallization rates.
Marginal bone level was measured on the mesial and distal sides of the implant, with the mean of two values regarded as representative value. Considering the fact that the distance between the threads of fixture (thread pitch) was 0.8 mm (4.5 mm in diameter) or 0.9 mm (5 mm in diameter) for TS III HA and 0.6 mm for TSV, the distance from the implant platform to the first bone-implant contact (BIC) in radiographs was measured and calculated by enlargement ratio. Marginal bone loss was calculated as the difference between the values taken on the initial day of loading and values taken at 1-year prosthetic loading.
For the comparison based on loading time, mean bone loss of the IL group was 0.32±0.69 mm, and that of the DL group was 0.16±0.42 mm, but the difference was not statistically significant (P=0.260).
In this retrospective research, HA-coated implant placed in the maxillary and mandibular posterior areas recorded short-term clinical success regardless of the loading time; the amount of marginal bone resorption also met the criteria for successful implantation.
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