Journal List > J Korean Acad Prosthodont > v.55(3) > 1034929

Yun, Lee, Chung, and Kim: Radiographic evaluation of computer aided design/computer aided manufacturing (CAD/CAM) customized abutment of implant



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.


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).


The customized abutment using CAD/CAM showed less bone loss than the results of existing research, there were statistically significant differences at alveolar bone loss in implant positions. (J Korean Acad Prosthodont 2017;55:258-63)


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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).
Fig. 2.
Periapical X-ray taking at final setting of implant prosthesis.
Fig. 3.
Panoramic X-ray taking at final setting of implant prosthesis.
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
  Mean of vertical bone loss of around the implants (mm)
  3-month recall 6-month recall 1-year recall 2-year recall 3-year recall 4-year recall Total
No Splinting 0.00 0.00 0.00 0.03 0.09 0.15 0.27
Splinting 0.00 0.00 0.00 0.12 0.19 0.19 0.50
P1) .571 .385 .165 .094 .362 .732 .350

1) Statistically significant difference (α = .05) (Independent t-test)

Table 5.
Vertical bone loss of around the implants classified by location of implant
  Mean of total vertical bone loss of around the implants (mm)
Anterior part of maxilla Posterior part of maxilla Anterior part of mandible Posterior part of mandible
Total vertical bone loss 1.37a) 0.39b) 0.00b) 0.30b)

a), b) Statistically significant difference between a) and b) (α= .05) (ANOVA test)

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