Çakmak, Gülce; Güven, Mehmet Esad; Donmez, Mustafa Borga; Kahveci, Çiğdem; Schimmel, Martin; Abou-Ayash, Samir; Yilmaz, Burak (2023). Effect of internal connection type and screw channel angle on the screw stability of anterior implant-supported zirconia crowns. Clinical oral implants research, 34(11), pp. 1248-1256. Wiley-Blackwell 10.1111/clr.14165
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OBJECTIVES
To investigate the effect of implant-abutment connection and screw channel angle on screw stability by comparing a newly introduced and an established connection, before and after cyclic loading.
MATERIALS AND METHODS
Implants (N = 44) with Torcfit (TF) or Crossfit (CF) connection were divided to be restored with a straight (CFS and TFS) or an angled screw access channel (CFA and TFA) titanium-base abutment (n = 11). CFA and TFA received screw-retained crowns, whereas CFS and TFS received hybrid zirconia abutments and cement-retained crowns. The initial torque value (ITV) of each complex (ITVI ) and removal torque value (RTV) after 24 h (RTVI ) were measured. Screws were replaced with new ones, ITVs were recorded again (ITVF ), and crowns were cyclically loaded (2.4 million cycles, 98 N) to measure RTVs again (RTVF ). Percentage torque loss was calculated. Data were analyzed (α = 0.05).
RESULTS
ITVs were similar among groups (p ≥ .089). CF led to higher RTVs (p ≤ .002), while CFS had higher RTVI than CFA (p = .023). After 24 h, CFS had lower percentage torque loss than TF, while CFA had lower percentage torque loss than TFA (p ≤ .011). After cyclic loading, CF led to lower percentage torque (p < .001).
CONCLUSION
The implant-abutment connection affected the removal torque values. However, no screw loosening occurred during cyclic loading, which indicated a stable connection for all groups. Screw access channel angle did not affect screw stability after cyclic loading.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry 04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology 04 Faculty of Medicine > School of Dental Medicine |
UniBE Contributor: |
Cakmak, Gülce, Dönmez, Mustafa-Borga, Schimmel, Martin, Abou-Ayash, Samir, Yilmaz, Burak |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
0905-7161 |
Publisher: |
Wiley-Blackwell |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
15 Aug 2023 16:25 |
Last Modified: |
10 Nov 2023 00:13 |
Publisher DOI: |
10.1111/clr.14165 |
PubMed ID: |
37578653 |
Uncontrolled Keywords: |
angled screw channel implant-abutment connection screw stability torque loss |
BORIS DOI: |
10.48350/185464 |
URI: |
https://boris.unibe.ch/id/eprint/185464 |
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