Publications by authors named "Christoph Ratka"

Objectives: Analysis of the in vitro efficacy of non-surgical and surgical dental implant surface decontamination with or without suprastructure.

Materials And Methods: Three hundred and sixty implants were dipped in indelible red and distributed to 30°, 60°, or 90° angulated bone defect models. One hundred and twenty implants were used for each bone defect, 40 of which were assigned to a decontamination method (CUR: curette; SOSC: soundscaler; APA: air powder abrasion).

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Objective: To compare the in vitro decontamination efficacy of two electrolytic cleaning methods to diode laser, plasma, and air-abrasive devices.

Material And Methods: Sixty sandblasted large-grit acid-etched (SLA) implants were incubated with 2 ml of human saliva and Tryptic Soy Broth solution under continuous shaking for 14 days. Implants were then randomly assigned to one untreated control group (n = 10) and 5 different decontamination modalities: air-abrasive powder (n = 10), diode laser (n = 10), plasma cleaning (n = 10), and two electrolytic test protocols using either potassium iodide (KI) (n = 10) or sodium formate (CHNaO) (n = 10) solution.

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The tightening torque applied to a screw in a provisional restoration immediately after implant placement in a fresh extraction socket is often too low to gain sufficient preload force. Therefore, abutment screw loosening is a common complication. The aim of this study was to investigate whether it is possible to increase the preload force of a given tightening torque by anodizing parts of the implant-abutment complex.

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Purpose: Assessment of in vitro efficacy of three different nonsurgical implant surface decontamination methods in three peri-implant bone defect simulation models.

Materials And Methods: A total of 180 implants were allocated to differently angulated (30, 60, and 90 degrees) peri-implant bone defect resin models, each covered by a mucosa mask. All implants were stained with indelible red color and assigned to one of the three defect models.

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Statement Of Problem: Screw loosening is a common problem in implant dentistry; however, information is sparse on the influence of different fluids on the screw threads.

Purpose: The purpose of this in vitro study was to investigate the influence of 4 different fluids and agents (saliva, blood, chlorhexidine [CHX] gel, and special sealing silicone) on the preload force of abutment screws.

Materials And Methods: The test specimens (N=50) consisted of a thread sleeve resembling the implant, an abutment analog, and an abutment screw.

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Objectives: Evaluation of surgical and non-surgical air-polishing in vitro efficacy for implant surface decontamination.

Material And Methods: One hundred eighty implants were distributed to three differently angulated bone defect models (30°, 60°, 90°). Biofilm was imitated using indelible red color.

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Objectives: The present randomized clinical trial assesses the six-month outcomes following surgical regenerative therapy of periimplantitis lesions using either an electrolytic method (EC) to remove biofilms or a combination of powder spray and electrolytic method (PEC).

Materials And Methods: 24 patients with 24 implants suffering from peri-implantitis with any type of bone defect were randomly treated by EC or PEC. Bone defects were augmented with a mixture of natural bone mineral and autogenous bone and left for submerged healing.

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Purpose: The aim of this study is to record material- and surface-dependent heat dissipation during the process of inserting implants into native animal bone.

Materials And Methods: Implants made of titanium and zirconium that were identical in macrodesign were inserted under controlled conditions into a bovine rib tempered to 37 °C. The resulting surface temperature was measured on two bone windows by an infrared camera.

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Purpose: Bacterial biofilms are a major problem in the treatment of infected dental and orthopedic implants. The purpose of this study is to investigate the cleaning effect of an electrolytic approach (EC) compared to a powder-spray system (PSS) on titanium surfaces.

Materials And Methods: The tested implants (different surfaces and alloys) were collated into six groups and treated ether with EC or PSS.

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Objectives: Evaluation of in vitro efficacy of three different implant surface decontamination methods in a peri-implant bone defect model.

Material And Methods: A total of 180 implants were stained with indelible red color and distributed to standardized peri-implant bone defect resin models with a circumferential defect angulation of 30°, 60°, or 90° (supraosseous defect). Sixty implants were assigned to each type of defect.

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Background: The implant-abutment connection (IAC) is known to be a key factor for the long-term stability of peri-implant tissue.

Purpose: The aim of the present in vitro study was to detect and measure the mechanical behavior of different IACs by X-ray imaging.

Materials And Methods: A total of 20 different implant systems with various implant dimensions and IACs (13 conical-, 6 flat-, and 1 gable-like IAC) have been tested using a chewing device simulating dynamic and static loading up to 200 N.

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Purpose: The aim of this study was to investigate the effects of tightening torque, screw head angle, and thread number on the preload force of abutment screws.

Materials And Methods: The test specimens consisted of three self-manufactured components (ie, a thread sleeve serving as an implant analog, an abutment analog, and an abutment screw). The abutment screws were fabricated with metric M1.

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