Synchrotron-based micro computed tomography investigation of the implant-abutment fatigue-induced microgap changes

Bagegni, Aimen; Zabler, Simon; Nelson, Katja; Rack, Alexander; Spies, Benedikt Christopher; Vach, Kirstin; Kohal, Ralf‐Joachim

doi:10.1016/j.jmbbm.2021.104330

Cited by 10 publications

(14 citation statements)

References 33 publications

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“…As a consequence, the risk of screw loosening and of potential mechanical complications may increase. According to the literature, the microgap between the implant and the abutment has a large impact on implant treatment success [ 4 , 20 , 51 , 57 , 58 , 59 ]. However, it should be mentioned that microgaps of 10 µm or less exert no harmful effects, either to hard or to soft tissues [ 54 , 55 , 56 ].…”

Section: Discussionmentioning

confidence: 99%

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Micro-CT Evaluation of Microgaps at Implant-Abutment Connection

et al. 2023

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The assessment of microgaps at the implant–abutment interface is an important factor that may influence clinical success. Thus, the aim of this study was to evaluate the size of microgaps between prefabricated and customised abutments (Astra Tech, Dentsply, York, PA, USA; Apollo Implants Components, Pabianice, Poland) mounted on a standard implant. The measurement of the microgap was performed using micro-computed tomography (MCT). Due to 15-degree rotation of samples, 24 microsections were obtained. Scans were performed at four levels established at the interface between the abutment and the implant neck. Moreover, the volume of the microgap was evaluated. The size of the microgap at all measured levels varied from 0.1 to 3.7 µm for Astra and from 0.1 to 4.9 µm for Apollo (p > 0.05). Moreover, 90% of the Astra specimens and 70% of the Apollo specimens did not exhibit any microgaps. The highest mean values of microgap size for both groups were detected at the lowest portion of the abutment (p > 0.05). Additionally, the average microgap volume was greater for Apollo than for Astra (p > 0.05). It can be concluded that most samples did not exhibit any microgaps. Furthermore, the linear and volumetric dimensions of microgaps observed at the interface between Apollo or Astra abutments and Astra implants were comparable. Additionally, all tested components presented microgaps (if any) that were clinically acceptable. However, the microgap size of the Apollo abutment was higher and more variable than that of the Astra one.

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Section: Discussionmentioning

confidence: 99%

“…It is worth emphasizing that due to the shadow effect, measurement error might occur [ 21 ]. In the MCT study, the Morse cone exhibited similar microgap values for the butt-joint connection (0.26–0.47 µm) [ 58 ].…”

Section: Discussionmentioning

confidence: 99%

Micro-CT Evaluation of Microgaps at Implant-Abutment Connection

et al. 2023

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“…Screw loosening of the conical connection group during the chewing simulation might be the result of the abutment "sinking" into the implant because of the chewing load. Studies have reported a vertical displacement of the abutment in relation to the implant [39,42,43]. This vertical displacement might cause slippage between the threads of the screw and the threads of the implant, resulting in the loss of the preload and screw loosening.…”

Section: Discussionmentioning

confidence: 99%

The Mechanical Behavior of a Screwless Morse Taper Implant–Abutment Connection: An In Vitro Study

et al. 2022

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The use of screwless Morse taper implant–abutment connections (IAC) might facilitate the clinician’s work by eliminating the mechanical complications associated with the retention screw. The aim of this study is to evaluate the effect of artificial chewing on the long-term stability of screwless Morse taper IACs. Thirty-two implant abutments restored with an upper central incisor zirconia crown were used and divided into four groups according to the implant–abutment assembling manner (C1,H: screw retained (20 Ncm); C2: tapped; or C3: torqued (20 Ncm; the screws were removed before the dynamic loading)). All specimens were subjected to a cyclic loading (98 N) for 10 million chewing cycles. The survived samples were exposed to a pull-off force until failure/disassembling of the connection. All the samples revealed a 100% survival. Regarding the pull-off test, the screw-retained internal hexagonal IAC revealed significantly higher resistance to failure/disassembling (769.6 N) than screwless conical IACs (171.6 N–246 N) (p < 0.0001). The retention forces in the Morse taper groups were not significantly different (p > 0.05). The screw-retained hexagonal IAC showed the highest retention stability. The screw preload/retention in the conical IAC was lost over time in the group where the screws were kept in place during loading. Nevertheless, the screwless Morse taper IACs were stable for an extended service time and might represent a valid form of treatment for single-tooth replacement.

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“…Bagegni et al 65 evaluated the impact of dynamic loading on the micro gap of the implant-abutment connection when various superstructure heights are selected. 48 dental implants divided two groups (butt-joint and internalchronic connection) each containing 24 implants, and also according to the height of the superstructure they were further divided into the subgroup.…”

Section: Evaluation Of Changes In the Implant-abutment Connectionmentioning

confidence: 99%

Protetik Diş Hekimliğinde Mikro Bilgisayarlı Tomografi Kullanımı

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2023

Cumhuriyet Dental Journal

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Today, the use of micro-computed tomography is becoming widespread in almost every field of dental research. When the national review articles on micro-computed tomography are examined, it is seen that the focus is on endodontic and surgical dental applications. As prosthodontists, our article, which was compiled in order to deepen the specific usage areas of micro-computed tomography applications and to review the studies done in this area, provides information about the use of micro-computed tomography method in prosthetic dentistry. Micro-computed tomography is a powerful in vitro research method. Micro-computed tomography was used; marginal and internal compatibility of restorations, cement spacing of restorations, adaptation of denture bases, accuracy of prosthetic measurements, effects of occlusal irregularities, volumetric changes in teeth due to dental post application, biomechanical evaluation of implant-abutment connection, and compatibility of maxillofacial prostheses.

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Synchrotron-based micro computed tomography investigation of the implant-abutment fatigue-induced microgap changes

Cited by 10 publications

References 33 publications

Micro-CT Evaluation of Microgaps at Implant-Abutment Connection

Micro-CT Evaluation of Microgaps at Implant-Abutment Connection

The Mechanical Behavior of a Screwless Morse Taper Implant–Abutment Connection: An In Vitro Study

Protetik Diş Hekimliğinde Mikro Bilgisayarlı Tomografi Kullanımı

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