Christoph Bourauel

Christoph Bourauel
University of Bonn | Uni Bonn · Zentrum für Zahn-, Mund,- und Kieferheilkunde

Prof. Dr.rer.nat. Dipl.-Phys.

About

396
Publications
58,897
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6,877
Citations
Additional affiliations
September 1987 - August 2006
University of Bonn
Position
  • Head Experimental Orthodontics Laboratory

Publications

Publications (396)
Article
Full-text available
Objective Since there is no material in the market met all the ideal requirements of an impression material, thus in an attempt to find one, hybridization between the two most commonly used impression materials were done. The aim of the hybridization was to obtain a new material combining the good merits of both and eliminate their shortcomings. Th...
Article
Full-text available
Objectives To evaluate the wear resistance and abrasiveness of monolithic CAD/CAM ceramics. Materials and methods Rectangular-shaped specimens (12 mm × 6.5 mm × 1.5 mm) were sectioned from the following CAD/CAM blocks ( n = 10); partially crystallized lithium disilicate (PLD), experimental fully crystallized lithium disilicate (FLD), zirconia-rein...
Article
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Small fracture treatment includes the use of so‐called “Herbert screws”. In the past years, novel resorbable materials were introduced as an alternative to the classical titanium implants. The purpose of this study was to evaluate the influence of ongoing resorption/corrosion processes on the mechanical stability screws made from the magnesium allo...
Article
Full-text available
Objective: To evaluate, in-vitro, the change in crown inclination that occurs during orthodontic leveling and alignment using different archwire-bracket-ligation combinations. Materials and methods: Four archwire types were tested: (1) 0.012-in stainless steel and (2) 0.0155-in stainless steel multi-stranded, (3) 0.012-in nitinol Orthonol® and (...
Article
Guided implant placement has been shown to be more accurate than free-handed insertion. Still, implant position deviations occur and could possibly pose risks. Thus, there is a quest to identify factors that might impair the accuracy of implantation protocols using templates. This study aimed to investigate the influence of autoclaving cycles (cycl...
Article
Purpose Although endocrown is a successful restorative approach for endodontically treated molars, its survival rate in endodontically treated premolars with extensive loss of coronal structure has been debated. The aim of this study was to evaluate the biomechanical behavior of endodontically treated maxillary premolars restored with different lit...
Article
Full-text available
Objectives To analyse the sliding resistance of a modern 3D-printed polymer bracket combined with different archwire types and to compare the results with conventionally used polymeric, ceramic and metal brackets. It was of further interest which bracket-archwire combination could be best qualified for clinical use. Materials and methods The slidi...
Article
Introduction The assessment of forces and moments generated by fully customized lingual appliances and their effectiveness in tooth movement were compared with conventional labial bracket systems, applied to a specific malocclusion model. Methods Two fully customized lingual appliances (Incognito [3M Unitek, Monrovia, Calif] and WiN [DW Lingual Sy...
Article
Objective This interlaboratory round robin test investigated the robustness of the Chevron-Notch Beam (CNB) test method and the effect of the processing and testing variations on the fracture toughness of a dental 3Y-TZP ceramic. Methods The round robin test was performed precisely following the procedures recommended in ISO 24370:2005 and applied...
Article
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Objectives The aim of the study was to determine differences between Locator and CM LOC attachment systems regarding patient satisfaction and wear of the abutments and their inserts. Plaque accumulation onto the polyetherketoneketone (PEKK) framework and polymethylmethacrylate (PMMA) was investigated for the implant-supported overdentures. Methods...
Article
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Background and objectives Alterations in the microenvironment of implant surfaces could influence the cellular crosstalk and adhesion patterns of dental implant materials. Cold plasma has been described to have an influence on cells, tissues, and biomaterials. Hence, the mechanisms of osseointegration may be altered by non-thermal plasma treatment...
Article
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A finite element analysis was used to determine the loading behavior of a full “All‐on‐4” bridge in the maxilla made from different framework materials. The model was generated based on data from an edentulous maxilla. Four implants were positioned according to the All‐on‐4 concept and a full arch restoration was created on top of the implants. Sep...
Article
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This study aimed to investigate the force values exerted from rectangular wires when combined with conventional labial and fully customized lingual appliances under predefined, idealized activation. Fully customized lingual brackets of two brands Incognito™ (3M Unitek, Monrovia, MN, USA) and WIN (DW Lingual Systems, Bad Essen, Germany) and labial b...
Article
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Objectives As part of orthodontic treatment, air polishing is routinely used for professional tooth cleaning. Thus, we investigated the effects of static powder polishing on sliding behaviour and surface quality of three different bracket materials (polymer, ceramic, metal), including a 3D-printed bracket. Methods Two bracket types of each materia...
Presentation
Abstract: Wear of tooth substrates and dental restorative materials is considered a critical factor and can adversely affect the long-term outcome of the treatment [1]. Abrasive restorative materials can cause loss of tooth structure in the opposing dentition with subsequent increase in tooth hypersensitivity and/or caries susceptibility [2] The ai...
Article
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Objective Investigate and compare the mechanical properties of different aligner materials before and after deep drawing and determine differences in the mechanical properties after thermoforming. Materials and methods Four aligner film sheets from three manufacturers (Duran Plus® [Scheu Dental, Iserlohn, Germany]; Zendura® [ClearCorrect, Bay Mate...
Article
Full-text available
Objectives The aim of this study was, firstly, to analyse the long-time fatigue behaviour of crowns constructed from a novel polyetherketoneketone (PEKK) polymer, using artificial prepared teeth. Secondly, to determine the effect of the material’s stiffness that used as an artificial prepared tooth on the fatigue life of the PEKK crowns in comparis...
Article
Purpose: The aim was to compare rectangular multiforce nickel-titanium (NiTi) wires to rectangular wires with only one force zone. Both types of wires are primarily intended for use during the levelling phase of orthodontic treatment. Thus, basic mechanical properties were examined by means of a three-point bending test. Torque expression, which i...
Article
Objective: Generate a finite element (FE) model to simulate space closure and retraction mechanics for anterior maxillary teeth in periodontally compromised dentition, and compare the biomechanical effect of initial force systems with varying magnitude. Materials and methods: The geometry of an idealized finite element model (FEM) of a maxilla w...
Article
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Background Thermography is a contemporary imaging modality based on acquiring and analyzing thermal data using non-contact devices. The aim of the present study was to assess the validity of thermography, compared with that of the reference-standard, for the diagnosis of periapical inflammatory lesions and to evaluate the temperature ranges for acu...
Article
Aim : To assess the validity of a Convolutional Neural Network (CNN) digital model to detect and localize orthodontic malocclusions from intraoral clinical images. Materials and methods : The sample of this study consisted of the intraoral images of 700 Subjects. All images were intraoral clinical images, in one of the following views: Left Occlus...
Preprint
Full-text available
Background: Thermography is a contemporary imaging modality based on acquiring and analyzing thermal data using non-contact devices. The aim of the present study was to assess the validity of thermography, compared with that of the gold standard, for the diagnosis of endo-perio lesions and to evaluate the temperature ranges for acute pulpitis with...
Article
Craniofacial morphogenesis is an intricate developmental process in 3D, which therefore merits visualization and investigation in 3D. To better understand the process, we utilize µCT imaging, and describe a method to calibrate each cone beam µCT individually. Calibration is necessary, because during development, fetuses undergo tissue differentiati...
Article
Objective. The aim of this interlaboratory round robin test was to prove the robustness of the DIN EN ISO 6872:2019 and to identify the influence of processing and testing variations. Methods. Each of the 12 laboratories participated (A–L) received 60 (n = 720) assigned zirconia specimens. All participants seperated the specimens from the blanks, s...
Article
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The aim of this study was to investigate experimentally the fatigue and stability of three bar materials with distal extension at the molar region and to numerically analyse the biomechanical properties of the bar materials connected to overdentures in a patient individual model. A milled bar was designed for the mandible on four implants in the ca...
Article
The paper is concerned with simulation of the periodontal ligament response to force in the initial phase of orthodontic tooth movement. This is based on two previous investigations, a in vitro experiment with specimens of porcine mandibular premolars and a in vivo experiment on human upper first incisors. For the curve fit of the in vitro experime...
Article
Aim: The repair of restorations is an eligible method to extend the survival rates of intraoral restorations. There is a consensus that the old surface has to be removed before repair by the use of a sandblaster or rotating instruments. This study aimed to investigate whether a glycine powder can be used successfully in composite repair by measurem...
Article
As the percentage of overweight individuals in the population rises, diseases associated with excess weight resulting from poor nutrition are becoming more and more widespread. So far, the influence of weight or nutrition on bone health has shown conflicting results. In the literature, the existing studies disagree about the effect of diet on bones...
Article
Bilateral sagittal split osteotomy is one of the most frequently performed operations in orthognathic surgery. The health of the temporomandibular joint (TMJ) is an important prerequisite for its functionality. The aim of this finite element study was to assess the developed stresses during mouth opening after bilateral sagittal split osteotomy. Di...
Article
Full-text available
Background: Increased tooth mobility persists after fixed orthodontic appliance removal, which is therapeutically utilized for post-treatment finishing with positioners. As such a fine adjustment is only required for selected teeth, the aim of this pilot study was to investigate tooth mobility in vivo on corrected and uncorrected subgroups under p...
Article
Mini dental implants (MDI) have proven to be a good alternative of the conventional implants to support lower overdentures in elderly edentulous patients with narrow residual ridge. The aim of the present study was to define drilling protocols for each diameter of the MDI in each bone quality. The number and the diameter of the drilling bur and the...
Article
Aim: To assess the accuracy of DigiBrain4, Inc (DB4) Dental Classifier and DB4 Smart Search Engine* in recognizing, categorizing, and classifying dental visual assets as compared with Google Search Engine, one of the largest publicly available search engines and the largest data repository. Materials and methods: Dental visual assets were collec...
Article
Aim: The aim of the present study was to evaluate the number, strength, and position of occlusal contacts shown using an intraoral scanner (IOS) and a digital occlusal analysis system (T-Scan) compared with the current gold standard using occlusal foil (OF). Materials and methods: Occlusal contacts were analyzed for 70 volunteers using OF in max...
Article
Aim: Precise bonding of attachments in aligner treatment is crucial to achieve the intended tooth movement. Thus, we evaluated five different bonding protocols for attachments used in aligner treatments with the goal of identifying the most precise protocol. Methods: One ellipsoid and one rectangular attachment were exemplarily chosen and examin...
Article
Full-text available
Objectives This study was conducted in order to investigate whether enamel sandblasting as an adjunct or substitute to the acid-etch technique has an effect on the shear bond strength (SBS) and fractography of the bracket-adhesive-enamel complex using the DIN 13990:2017-04 standard. Materials and methods Upper central incisor brackets (discovery®,...
Article
Aims To reduce remaining plaque niches due to dental malocclusion after periodontal treatment and to avoid reinflammation of periodontitis, severe anterior crowding can be treated orthodontically. The treatment indication is motivated by aesthetic and functional needs. In this study the biomechanical behaviour of crowded lower front teeth in reduce...
Article
Objective To assess validity and reliability of palatal superimposition of holograms of 3D digital dental models using a customized software, (Ortho Mechanics Sequential Analyzer OMSA), installed on Microsoft HoloLens device as compared to the OMSA application running on a regular computer screen. Methods The sample consisted of pre‐ and post‐trea...
Article
The aim of this study was to evaluate the validity and reliability of three-dimensional (3D) landmark-based palatal superimposition of digital dental models using the customized software Ortho Mechanics Sequential Analyzer (OMSA) revised by the addition of a computer vision algorithm. The sample consisted of pre- and post-treatment digital maxillar...
Article
The aim of this study was to investigate the retention forces of secondary telescopic crowns made of polyetherketoneketone (PEKK) in combination with primary crowns made of four different dental alloys and to determine whether the retention forces change in the course of up to 5000 simulated wear cycles. A total of four groups of telescopic crowns...
Article
Aims: The aim of this study was to compare force loss due to friction (Fr) during simulated canine retraction using different archwire dimensions and materials between conventional and new self-ligating brackets. Methods: The tested brackets were (1) conventional brackets (Victory series, GAC twin and FLI twin), (2) self-ligating brackets (Damon-Q,...
Article
Full-text available
Objectives: The aim of the present study was to find out whether the high-performance polymer PEKK is an equivalent alternative compared to cobalt chrome (CoCr)-made restorations, regarding to biocompatibility, stability, and comfort. Materials and methods: Twenty-two patients (m, 10; f, 12) who were indicated for a long-term temporary-fixed res...
Article
Introduction The subject of the present study was a systematic comparative analysis of the rheumatoid arthritis (RA)‐induced pathomechanisms in the temporomandibular joint with those of the limb joints using the serum‐induced arthritis K/BxN model. Methods In 18 BALB/c mice the induction of RA was performed according to the Kouskoff method. Anothe...
Article
The formation of the alveolar bone, which houses the dental primordia, and later the roots of tooth, may serve as a model to approach general questions of alveolar bone formation. In this respect, this study aimed to investigate the potential interactions between the alveolar bone formation and tooth eruption by using finite element (FE) methods, a...
Article
Full-text available
Dental implants are important tools for restoring the loss of teeth. The rapid growth and periodic regeneration of antlers make Sika deer a good and less invasive alternative model for studying bone remodelling in mammals. We developed a special loading device for antlers and analysed the bone reaction around unloaded implants and under immediate l...
Data
The ARRIVE guidelines checklist. (DOCX)
Article
Purpose: This study aimed to determine and compare the mechanical properties of novel CAD/CAM(computer-aided design/manufacturing)-individualized nickel-titanium (NiTi) and conventional twisted wires. Methods: Seven NiTi wires (angular, 0.20 × 0.20 mm up to 0.50 × 0.50 mm) and two twisted steel wires (round, 0.40 mm and 0.44 mm) were investigate...
Article
This study aimed to compare biomechanical characteristics of immediately loaded (IL) and osseointegrated (OS) dental implants inserted into Sika deer antler and lay a foundation for developing an alternative animal model for dental implants studies. Two implants per antler were inserted. One implant was loaded immediately via a self-developed loadi...
Article
This study combines finite element method and animal studies, aiming to investigate tissue remodelling processes around dental implants inserted into sika deer antler and to develop an alternative animal consuming model for studying bone remodelling around implants. Implants were inserted in the antlers and loaded immediately via a self-developed l...
Article
Background/objective: The aim of this study was to evaluate the efficacy of tooth alignment with conventional and self-ligating labial and lingual orthodontic bracket systems. Materials/methods: We tested labial brackets (0.022′′ slot size) and lingual brackets (0.018′′ slot size). The labial brackets were: (i) regular twin brackets (GAC-Twin [Den...
Conference Paper
Full-text available
The healing process of dental implants after insertion is complex. It was assumed that implant healing is comparable to indirect fracture healing of long bones. Hence, the aim of the present study was to simulate the remodelling process of the bone bed surrounding dental implants, considering different tissue layers until the osseointegrated state...
Article
Poor stability of a complete denture is a common problem due to bone atrophy of the edentulous ridge. The aim of the present study was to analyze denture stability after receiving implants and to study the biomechanical properties of denture implants and the bone bed using conventional or mini implants. Five models based on computed tomography (CT)...
Article
Objectives: To compare the failure pattern of four different bracket types and to assess its effect on treatment duration. Materials and methods: A total of 78 white patients (28 male, 50 female) with a mean age of 12.6 years were included in this retrospective cohort study and treated for a mean period of 30.6 months. The patients were treated...
Article
Introduction: The aim of this study was to analyze the time-dependent in-vitro behavior of the periodontal ligament (PDL) by determining the material parameters using specimens of porcine jawbone. Time-dependent material parameters to be determined were expected to complement the results from earlier biomechanical studies. Methods: Five mandibul...
Article
Background Torque of the maxillary incisors is crucial to occlusal relationship and esthetics and can be influenced by many factors. The aim of this study was to assess the relative influence of the material of the orthodontic appliance (adhesive, bracket, ligature, and wire) on tooth displacements and developed stresses/strains after torque applic...