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Peer-reviewedCC BYInternational journal of implant dentistry

Internal fit of cobalt-chromium and zirconia implant abutments fabricated using different techniques: a micro-computed tomography study.

  • Pedro Molinero-Mourelle1,2,3
  • Seyed Ali Mosaddad1,4
  • Rocio Cascos-Sanchez1
  • Margarita Chevalier Del Río5
  • Gülce Çakmak6,7,8
  • Andrea Roccuzzo9,10
  • Miguel Gómez-Polo1
10 affiliations
  1. 1Department of Conservative Dentistry and Prosthodontics, Faculty of Dentistry, Complutense University of Madrid, Madrid, Spain.
  2. 2Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
  3. 3Complutense University of Madrid, Ramon y Cajal Research Institute (IRYCIS), Madrid, Spain.
  4. 4Department of Research Analytics, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospitals, Saveetha University, Chennai, India.
  5. 5Departament of Radiology, Rehabilitation and Physiotherapy, Faculty of Medicine, Complutense University of Madrid, Madrid, Spain.
  6. 6Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland. [email protected].
  7. 7Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Corporate Member of Freie Universität Berlin and Humboldt- Universität zu Berlin, Charité-Universitätsmedizin Berlin, Berlin, Germany. [email protected].
  8. 8Department of Prosthodontics, Faculty of Dentistry, Biruni University, Istanbul, Turkey. [email protected].
  9. 9Shanghai Perio-Implant Innovation Center, Institute of Integrated Oral, Craniofacial and Sensory Research, Shanghai Ninth People's Hospital, College of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
  10. 10Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
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Abstract

Purpose

To evaluate the internal fit at the implant-abutment interface of zirconia and cobalt-chromium abutments fabricated using different techniques by micro-computed tomography (micro-CT).Methods

Twenty screw-retained abutments were divided into 4 groups (n = 5): milled zirconia (ZrCAD), milled cobalt-chromium (Co-CrMill), laser-sintered cobalt-chromium (Co-CrLS), and cast cobalt-chromium (Co-CrCL). Specimens were subjected to cyclic loading (300,000 cycles, 200 N) and thermocycling (10000 cycles, 5 to 50 °C). Internal fit was assessed by micro-CT at 3 regions and 3 spatial planes (180 measurements). Data were analyzed with Kruskal-Wallis and Bonferroni-Holm tests (α = 0.05).Results

Significant differences in internal fit were found (p < 0.05). Co-CrLS showed the highest internal gap values (26.75 ± 7.05 μm, 87.00 ± 3.26 μm, 86.50 ± 5.76 μm). Significant differences were observed between Co-CrLS and ZrCAD (Region 1, p = 0.003), Co-CrMill (Regions 1 and 2, p = 0.003-0.004), and Co-CrCL (Regions 1 and 3, p = 0.003-0.001). Total values also differed between Co-CrMill and Co-CrLS (p = 0.012) and Co-CrCL and Co-CrLS (p = 0.002).Conclusions

Internal fit differed among the evaluated workflows. Laser-sintered cobalt-chromium abutments showed the least favorable adaptation, whereas milled and cast cobalt-chromium showed lower gap values; zirconia showed intermediate descriptive values. The clinical significance of these differences remains uncertain.Clinical trial number

Not applicable.

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Cite

BibTeXRIS
BibTeX
@article{molineromourelle2026internal,
  title = {{Internal fit of cobalt-chromium and zirconia implant abutments fabricated using different techniques: a micro-computed tomography study.}},
  author = {Pedro Molinero-Mourelle and Seyed Ali Mosaddad and Rocio Cascos-Sanchez and Margarita Chevalier Del Río and Gülce Çakmak and Andrea Roccuzzo and Miguel Gómez-Polo},
  journal = {International journal of implant dentistry},
  year = {2026},
  month = oct,
  doi = {10.1186/s40729-026-00718-x},
  url = {https://europepmc.org/article/MED/42895618},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Internal fit of cobalt-chromium and zirconia implant abutments fabricated using different techniques: a micro-computed tomography study.
AU  - Pedro Molinero-Mourelle
AU  - Seyed Ali Mosaddad
AU  - Rocio Cascos-Sanchez
AU  - Margarita Chevalier Del Río
AU  - Gülce Çakmak
AU  - Andrea Roccuzzo
AU  - Miguel Gómez-Polo
PY  - 2026
DA  - 2026/10/13
JO  - International journal of implant dentistry
DO  - 10.1186/s40729-026-00718-x
UR  - https://europepmc.org/article/MED/42895618
AB  - Purpose  To evaluate the internal fit at the implant-abutment interface of zirconia and cobalt-chromium abutments fabricated using different techniques by micro-computed tomography (micro-CT).Methods  Twenty screw-retained abutments were divided into 4 groups (n = 5): milled zirconia (ZrCAD), milled cobalt-chromium (Co-CrMill), laser-sintered cobalt-chromium (Co-CrLS), and cast cobalt-chromium (Co-CrCL). Specimens were subjected to cyclic loading (300,000 cycles, 200 N) and thermocycling (10000 cycles, 5 to 50 °C). Internal fit was assessed by micro-CT at 3 regions and 3 spatial planes (180 measurements). Data were analyzed with Kruskal-Wallis and Bonferroni-Holm tests (α = 0.05).Results  Significant differences in internal fit were found (p < 0.05). Co-CrLS showed the highest internal gap values (26.75 ± 7.05 μm, 87.00 ± 3.26 μm, 86.50 ± 5.76 μm). Significant differences were observed between Co-CrLS and ZrCAD (Region 1, p = 0.003), Co-CrMill (Regions 1 and 2, p = 0.003-0.004), and Co-CrCL (Regions 1 and 3, p = 0.003-0.001). Total values also differed between Co-CrMill and Co-CrLS (p = 0.012) and Co-CrCL and Co-CrLS (p = 0.002).Conclusions  Internal fit differed among the evaluated workflows. Laser-sintered cobalt-chromium abutments showed the least favorable adaptation, whereas milled and cast cobalt-chromium showed lower gap values; zirconia showed intermediate descriptive values. The clinical significance of these differences remains uncertain.Clinical trial number  Not applicable.
SN  - 2198-4034
ER  -