An In Vitro Evaluation of the Loosening of Different Interchangeable Abutments in Internal-Connection-Type Implants.

Park, Ji-Man; Baek, Chang-Hyun; Heo, Seong-Joo; Kim, Seong-Kyun; Koak, Jai-Young; Kim, Shin-Koo; Belser, Urs (2017). An In Vitro Evaluation of the Loosening of Different Interchangeable Abutments in Internal-Connection-Type Implants. The international journal of oral & maxillofacial implants, 32(2), pp. 350-355. Quintessence Publishing 10.11607/jomi.5295

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PURPOSE

The aim of this study was to compare the loosening of interchangeable one-piece abutments connected to internal-connection-type implants after cyclic loading.

MATERIALS AND METHODS

Four implant abutment groups (n = 7 in each group) with Straumann tissue-level implants were assessed: Straumann solid abutment (group S), Southern Implants solid abutment (group SI), Implant Direct straight abutment (group ID), and Blue Sky Bio regular platform abutment (group BSB). The implant was firmly held in a special jig to ensure fixation. Abutment screws were tightened to manufacturers' recommended torque with a digital torque gauge. The hemispherical loading members were fabricated for the load cell of a universal testing machine to evenly distribute the force on the specimens and to fulfill the ISO 14801:2007 standard. A cyclic loading of 25 N at 30 degrees to the implant's long axis was applied for a duty of a half million cycles. Tightening torques were measured prior to the loading. Removal torques were measured after cyclic loading. The data were analyzed with one-way analysis of variance (ANOVA), and the significance level was set at P < .05.

RESULTS

The mean removal torques after cyclic loading were 34.0 ± 1.1 Ncm (group S), 25.0 ± 1.5 Ncm (group SI), 23.9 ± 2.1 Ncm (group ID), and 27.9 ± 1.3 Ncm (group BSB). Removal torques of each group were statistically different in the order of group S > group BSB > groups SI and ID (P < .05). The mean reduction rates were -2.9% ± 3.2% (group S), -21.9% ± 4.8% (group SI), -20.2% ± 7.2% (group ID), and -6.9% ± 4.3% (group BSB) after a half million cycles, respectively. Reduction rates of groups S and BSB were statistically lower than those of groups SI and ID (P < .01). The standard deviation of group S was lower than group BSB.

CONCLUSION

The removal torque of the original Straumann abutment was significantly higher than those of the copy abutments. The reduction rate of the groups S and BSB abutments was lower than those of the other copy abutments.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > School of Dental Medicine > Department of Oral Surgery and Stomatology 04 Faculty of Medicine > School of Dental Medicine 04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology
UniBE Contributor:	Belser, Urs Christoph
Subjects:	600 Technology > 610 Medicine & health
ISSN:	1942-4434
Publisher:	Quintessence Publishing
Language:	English
Submitter:	Vanda Kummer
Date Deposited:	24 Jul 2019 13:48
Last Modified:	02 Mar 2023 23:31
Publisher DOI:	10.11607/jomi.5295
PubMed ID:	28291853
URI:	https://boris.unibe.ch/id/eprint/123736