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Abstract
Purpose
In this study, the retrospective radiographic study is executed to evaluate amount of bone loss of various conditions in patients using customized abutment for 4 years of follow-up.
Materials and methods
The subjects of this study were implant fixed dental prosthesis using CAD/CAM customized abutments. CAD/CAM customized abutment and fixed dental prosthesis were manufactured by the Prosthodontics Department of Chosun University Dental Hospital from August 1, 2011 to July 31, 2012. Radiological assessments were performed on the patients who were treated by the fixed prosthodontics. After each treatment, a retrospective study was performed for a total of 4 years at 3 months, 6 months, 1 year, 2 years, 3 years, and 4 years.
Results
As a result of the study, the customized abutment using CAD/CAM showed less bone loss than the results of existing research. There was no statistically significant differences at alveolar bone loss between splinting group and non-splinting group (respectively 0.27 mm, 0.5 mm). Also, there were statistically significant differences at alveolar bone loss in mx. anterior, mx. posterior, mn. anterior and mn. posterior part (respectively 1.37 mm, 0.39 mm, 0.00 mm, 0.30 mm).
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Fig. 1.
Number of implants placed in each location (eg. 26 maxillary right 1st molar were replaced with implant supported single tooth prostheses).
Table 1.
Causes of missing tooth
| Group | Periodontal disease | Caries | Trauma | Congenital missing | Periodontal disease & Caries | Total |
|---|---|---|---|---|---|---|
| No. of patient | 89 | 32 | 18 | 7 | 24 | 170 |
| No. of tooth | 207 | 62 | 31 | 10 | 47 | 357 |
Table 2.
Number of implant classified by implant company
| Classification of implant fixture | ||||||
|---|---|---|---|---|---|---|
| Astra | Biomet 3i | Zimmer | Dentis | Osstem | Total | |
| No. of fixture | 80 | 83 | 34 | 53 | 107 | 357 |
Table 3.
Total number of dental archs, number of fixtures and splinted fixtures
| No. of dental arch | No. of fixture | No. of splinted fixtures | Proportion of splinted fixtures | |
|---|---|---|---|---|
| Mx. | 85 | 199 | 161 | 81.0% |
| Mn. | 79 | 158 | 119 | 75.3% |
Table 4.
Vertical bone loss of around the implants classified by splinting
Table 5.
Vertical bone loss of around the implants classified by location of implant
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