J Korean Assoc Oral Maxillofac Surg.  2022 Jun;48(3):159-166. 10.5125/jkaoms.2022.48.3.159.

Marginal bone loss around crestal or subcrestal dental implants: prospective clinical study

• Sargolzaie N
• Zarch HH
• Arab H
• Koohestani T
• Ramandi MF

• KMID: 2531052
• DOI: http://doi.org/10.5125/jkaoms.2022.48.3.159

Abstract

Objectives
The stability of crestal bone has been reported as a major factor in the success of dental implants. Implants can be placed in an equicrestal (crestal) or subcrestal position. The aim of this study was to evaluate the effect of implant depth placement on marginal bone loss.
Materials and Methods
The study was created in a split-mouth design. Immediately after implant surgery, digital parallel radiographs were prepared and levels of bone were measured where marginal bone loss and bone level changes occurred. These measurements were repeated at 3-month and 6-month follow-up periods.
Results
In this interventional study, 49 implants were evaluated in 18 patients. Primary bone height was not significant between the intervention and control groups in both mesial and distal aspects at 3 months and 6 months from the baseline. The mean marginal bone loss on the mesial side was 1.03 mm in the subcrestal group and 0.83 mm in the crestal group. In addition, mean marginal bone loss on the distal side was 0.88 mm and 0.81 mm in the subcrestal and crestal groups, respectively. Marginal bone loss was not significantly different between sexes, the maxilla or mandible, and in the anterior or posterior regions as well as between different lengths and diameters of implants.
Conclusion
Based on the results of this study, there was no significant difference in terms of marginal bone loss between crestal and subcrestal implants.

Keyword

Marginal bone loss; Implant; Crestal; Subcrestal

Figure

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  Fig. 1 Measurement of the bone crest to the apex of the fixture in both mesial and distal aspects. Baseline radiographic image.

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  Fig. 2 Measurement of the bone crest to the apex of the fixture at both mesial and distal aspects. Three-month radiographic image.

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  Fig. 3 Mesial bone level change.

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  Fig. 4 Distal bone level change.

Reference

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