Volume 17, Issue 5 pp. 871-878
ARTICLE

Fresh-Socket Implants of Different Collar Length: Clinical Evaluation in the Aesthetic Zone

Roberto Crespi MD, MS

Corresponding Author

Roberto Crespi MD, MS

Clinical professor

Department of Dentistry, Vita Salute University, San Raffaele Hospital, Milan, Italy

Corresponding Author: Dr. Roberto Crespi, Department of Dentistry, Vita Salute University, San Raffaele Hospital, Via Olgettina N.48, 20123 Milano, Italy; e-mail: [email protected]Search for more papers by this author
Paolo Capparè MD, DMD

Paolo Capparè MD, DMD

Adjunct professor

Department of Dentistry, Vita Salute University, San Raffaele Hospital, Milan, Italy

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Elisabetta Polizzi DH

Elisabetta Polizzi DH

Adjunct professor

Department of Dentistry, Vita Salute University, San Raffaele Hospital, Milan, Italy

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Enrico Gherlone MD, DMD

Enrico Gherlone MD, DMD

Full professor and chairman

Department of Dentistry, Vita Salute University, San Raffaele Hospital, Milan, Italy

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First published: 07 February 2014
Citations: 16

Abstract

Background

The aim of this clinical study was to compare clinical evaluations of implants in the aesthetic zone with smooth collars of different length.

Materials and Methods

Sixty-six patients requiring extractions of one, two, or three teeth in the aesthetic zone of the maxilla were enrolled in this study. Ninety-four implants were positioned and were loaded immediately after tooth extraction. Forty-seven implants with a short smooth collar of 0.5 mm (SCI) and 47 implants with a long smooth collar of 1.8 mm (LCI) were utilized in this study and were placed using a nonsubmerged approach. Clinical (gingival index, modified plaque index, modified bleeding index, probing depth, gingival recession) and intraoral digital radiographic parameters were measured at baseline and after 6, 12, 24, and 36 months of healing to evaluate crestal bone loss levels over time.

Results

After a follow-up period of 36 months, a survival rate of 100% was reported. The SCI group showed a mean bone loss of 1.07 ± 0.38 mm at 12 months and 1.09 ± 0.38 mm at 36 months. The LCI group showed a mean bone loss of 0.46 ± 0.14 mm at 12 months and 0.53 ± 0.12 mm at 36 months. After the 36-month follow-up period, both groups showed stable bone levels over time. Statistically significant differences were found between groups (p < .05).

No statistically significant differences were found between SCI and LCI groups with regard to clinical parameters over time.

Conclusions

This study revealed significant differences in radiographically observed marginal bone loss between the two types of implant with different smooth-collar lengths, but no differences in gingival vestibular margin outcome were observed.

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