Deformation of implant retaining screws—Study with stereoscopic microscopy and microCT

Batista, Ricardo; Moreira, André; Oliveira, Sofia Castro; Mesquita, Pedro; Sampaio-Fernandes, J.C.; Figueiral, Maria Helena

doi:10.1111/jerd.12959

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…Apart from applying 2D or 3D bone models in the numerical simulations, microCT has been also used in analyzing the osseointegration as the untightening of the prosthetic screw is the most common problem in oral rehabilitation with implants. Batista et al determined that the torque applied is crucial to the head deformation in titanium screws which fix the prostheses to the implant [21]. In other study, authors used microCT analysis to determine the effect of fixing grafted bone with an adhesive, screw and their combination.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Thread Engagement in Screw-Plate Interface of Polyaxial Locking System Using X-ray Computed Tomography

Bartkowiak,

Madalińska,

Mietliński

et al. 2023

Materials

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This study demonstrates a new method for quantifying thread engagement in mechanical connections and verifies its applicability using biomedical implants under push-out tests. The focus is on orthopedic plate implants employed for bone fracture fixation, which, by design, allow off-axis screw insertion to accommodate different contact conditions. Thread engagement is crucial in determining connection strength and stability. In medical practice, off-axis screw placement is usually necessary due to bone geometries and implant plate rigidity. To address this, the study proposes a quantification method using non-destructive testing with X-ray micro-computed tomography and automated image processing, although tuning the image processing parameters is vital for accurate and reliable results. This enables detailed 3D models of screw-plate interfaces for precise thread engagement measurement. The results show that thread engagement decreases with both, increased off-axis insertion angles and higher torque during insertion. Correlation analysis reveals a strong relationship (R2 > 0.6) between average thread engagement and push-out strength, underscoring the importance of proper screw placement for stable fixation.

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Section: Introductionmentioning

confidence: 99%

Quantification of Thread Engagement in Screw-Plate Interface of Polyaxial Locking System Using X-ray Computed Tomography

Bartkowiak,

Madalińska,

Mietliński

et al. 2023

Materials

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Comparative in vitro evaluation of microgap in titanium stock versus cobalt–chrome custom abutments on a conical connection implant: Effect of crown cementation and ceramic veneering

Herrero‐Climent,

Martínez‐Rus,

Salido

et al. 2024

Clinical Oral Implants Res

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ObjectiveTo compare the implant–abutment connection microgap between computer‐aided design and computer‐aided manufacturing (CAD/CAM) milled or laser‐sintered cobalt–chrome custom abutments with or without ceramic veneering and titanium stock abutments with or without crown cementation.Material and MethodsSix groups of six abutments each were prepared: (1) CAD/CAM cobalt–chrome custom abutments: milled, milled with ceramic veneering, laser‐sintered, and laser‐sintered with ceramic veneering (four groups: MIL, MIL‐C, SIN, and SIN‐C, respectively) and (2) titanium stock abutments with or without zirconia crown cementation (two groups: STK and STK‐Z, respectively). Abutments were screwed to the implants by applying 30 Ncm torque. All 36 samples were sectioned along their long axes. The implant–abutment connection microgap was measured using scanning electron microscopy on the right and left sides of the connection at the upper, middle, and lower levels. Data were analyzed using the Kruskal–Wallis test (p < .05).ResultsMean values (μm) of the microgap were 0.54 ± 0.44 (STK), 0.55 ± 0.48 (STK‐Z), 1.53 ± 1.30 (MIL), 2.30 ± 2.2 (MIL‐C), 1.53 ± 1.37 (SIN), and 1.87 ± 1.8 (SIN‐C). Although significant differences were observed between the STK and STK‐Z groups and the other groups (p < .05), none were observed between the milled and laser‐sintered groups before or after ceramic veneering. The largest microgap was observed at the upper level in all groups.ConclusionsTitanium stock abutments provided a closer fit than cobalt–chrome custom abutments. Neither crown cementation nor ceramic veneering resulted in significant changes in the implant–abutment connection microgap.

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Modern Scientific Conceptions About the Factors Influencing the Success of Dental Implantation

Serebryanyy,

Dymnikov

2024

Actual Problems in Dentistry

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For the full-fledged work of a dentist-implantologist working in the field of replenishment of dentition with the help of dental implants and prostheses based on them in the modern realities of excessive variability of implant systems and suprastructures for them, the clinician needs to understand the criteria that various structural elements must meet, regardless of whether the structure is a single tooth, a bridge, or a full dentition restored with the above structure. In accordance with modern scientific concepts, the long-term survival of implants and teeth restored with their help is influenced by various mechanical and biological factors, such as: switching platforms, the type of connection of the abutment to the implant body, including the cone, its angle, internal or external polyhedron, the type and shape of the thread, the coating of the screw fixing the superstructure to the shaft of the dental implant (DI), the condition of the soft tissues and other factors disclosed in this article. The article will be useful for dentists involved in the restoration of dentition using various types of prostheses based on DI to become familiar with modern trends and scientifically proven facts about various elements of the implant-prosthesis complex. The article will also be useful for the clinician to select an implantological system that meets modern criteria of reliability and efficiency among the many variations presented on the medical device market. The team of authors recommends that the article be read by senior students and residents studying at the dental faculties of medical universities for a deeper understanding of the conditions that in the near future they will have to take into account when following the path of an orthopedic dentist or dental surgeon.

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Deformation of implant retaining screws—Study with stereoscopic microscopy and microCT

Cited by 4 publications

References 20 publications

Quantification of Thread Engagement in Screw-Plate Interface of Polyaxial Locking System Using X-ray Computed Tomography

Quantification of Thread Engagement in Screw-Plate Interface of Polyaxial Locking System Using X-ray Computed Tomography

Comparative in vitro evaluation of microgap in titanium stock versus cobalt–chrome custom abutments on a conical connection implant: Effect of crown cementation and ceramic veneering

Modern Scientific Conceptions About the Factors Influencing the Success of Dental Implantation

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