Joannis Katsoulis

Joannis Katsoulis
University of Bern | UniBe · Department of Reconstructive Dentistry and Gerodontology

Prof. Dr. med. dent., MAS

About

68
Publications
28,420
Reads
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2,187
Citations
Additional affiliations
July 2015 - present
University of Bern
Position
  • Professor (Associate)
August 2014 - June 2015
University of Bern
Position
  • Scientific Associate
September 2013 - July 2014
University of Bern
Position
  • Scientific Associate

Publications

Publications (68)
Article
Die Verwendung von CAD/CAM-gefertigten Titanstegen zur Unterstützung von implantatgetragenen Hybridprothesen (implant overdentures, IOD) ist in der rekonstruktiven Zahnmedizin weit verbreitet. In mehreren Studien wurde von guten klinischen Ergebnissen mit Titanstegen berichtet und diese werden als vorhersagbare und zuverlässige Behandlungsoption em...
Article
Objective: The aim of this in-vitro study was to investigate the tactile assessment ability at the implant impression-taking stage. Methods: Thirty clinicians (18 novices, 12 experts) were included for a tactile fit assessment by using a used/new probe (tip diameter 100 µm/20 µm). Six implant replicas and related impression copings of two intern...
Article
Zirkonoxidstege mit distalen Verlängerungen für implantatgetragene Deckprothesen scheinen eine zuverlässige Option für die prothetische Rehabilitation zahnloser Unterkiefer zu sein. In einer einjährigen Studie, in der insgesamt 15 Patienten Versorgungen mit je zwei interforaminalen Implantaten und eine durch einen CAD/CAM-Steg aus Zirkonoxid mit di...
Article
Full-text available
Objective: This review primarily evaluated the success, survival and failure rates of implants shorter than 10 mm restored with single-unit or splinted fixed dental prostheses in maxillary sinus augmented sites. Material and methods: Two reviewers independently performed the systematic search of electronic databases, including MEDLINE, EMBASE and...
Article
Full-text available
Background Computer-assisted implant planning has become an important diagnostic and therapeutic tool in modern dentistry. This case report emphasizes the possibilities in modern implantology combining virtual implant planning, guided surgery with tooth and implant supported templates, immediate implant placement and loading. Case presentation A s...
Article
Purpose: To evaluate the influence of the crown-to-implant ratio (CI) on marginal bone loss (MBL) around short dental implants placed in the posterior mandible. Materials and methods: All patients treated with short implants (7 mm length) in the posterior mandible between 1994 and 2003 at the Dental Clinic of the Department of Neuroscience of th...
Article
De nos jours et grâce aux progrès de la prophylaxie médico-dentaire, les personnes qui gardent leurs dents naturelles jusqu’ à un âge avancé sont de plus en plus nombreuses – et cependant, en Suisse également, les personnes édentées ou porteuses de prothèses dentaires amovibles insuffisantes sont encore nombreuses. Lorsque les indices en faveur d’...
Article
Purpose: The aim of this cross-sectional study was to assess maximum restraining lip force (MLF), maximum voluntary bite force (MBF), and patient-related parameters to evaluate their influence on masticatory function in four groups of participants with different dental states. Methods: Participants were recruited and assigned to one of four diff...
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Full-text available
BACKGROUND AND AIM: Compromised fit between the contact surfaces of screw-retained implant-supported fixed dentures (IFDs) is thought to create uncontrolled strains in the prosthetic components and peri-implant tissues, thus evoking biological and technical complications such as bone loss, screw loosening, component fractures and, at worst, loss of...
Article
Objective: Today, only scarce information is available on monolithic zirconia reconstructions. The objective of this study was to evaluate the performance of monolithic zirconia for tooth- and implant-borne reconstructions. Method and materials: Monolithic zirconia single crowns (SCs) and fixed dental prostheses (FDPs) supported by implants or t...
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Full-text available
Aims: To analyze frequency distribution of prosthetic reconstructions and therapeutic modalities with implant-supported reconstructions (ISRs) applied in a university graduate program. Methodology: Data of implant placement and related ISR were obtained from treatment plans, surgical protocols and patients' charts, covering the 2005 to 2010 time pe...
Article
div class="title">Focused Ion Beam (FIB) and Energy Dispersive X-Ray (EDX) Analysis in Adhesive Dentistry - Volume 22 Issue S3 - Lolita Rotkina, Christoph Zbaeren, Joannis Katsoulis, Tomohiro Takagaki, Markus Blatz
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Objectives: Little information is available on the impact of different scan strategies on the accuracy of full-arch scans with intraoral scanners. The aim of this in-vitro study was to investigate the trueness and precision of full-arch maxillary digital impressions comparing three scan strategies. Method and materials: Three scan strategies (A,...
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Full-text available
https://journal-stomato-implanto.com/content/ls-71-les-prothèses-overdenture-sur-implants-chez-la-personne-âgée Avec l’introduction des implants dentaires, la manière de stabiliser les prothèses complètes a totalement changé. Il a été démontré dans de nombreuses études que la stabilisation d’une prothèse inférieure à l’aide de deux implants est fa...
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Full-text available
Purpose: The aim of this prospective cohort study was to investigate clinical and laboratory performance of implant- supported reconstructions comparing the digital to the conventional workflow. Materials and Methods: Twenty study participants were treated in a cross-over design for single-tooth replacement in posterior sites, each with a customize...
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Full-text available
Nowadays many people retain their natural teeth until late in life as a result of the large success of preventive strategies. However, there is still a very high prevalence of edentulism especially in elderly patients and many of these patients are provided with inadequate dental prostheses. In addition, many elderly citizens suffer from systemic d...
Article
Background Prostheses in the edentulous maxilla affect the mucosa.PurposeTo evaluate mucosal alterations with implant supported fixed prostheses (FDP) and overdentures (IOD).Material and Methods Patients receiving prostheses during a time period of 10 years were recruited. Maxillary mucosal conditions in relation to FDPs, IODs were analyzed. Peri-i...
Article
The study aims to evaluate three-dimensionally (3D) the accuracy of implant impressions using a new resin splinting material, "Smart Dentin Replacement" (SDR). A titanium model of an edentulous mandible with six implant analogues was used as a master model and its dimensions measured with a coordinate measuring machine. Before the total 60 impressi...
Article
The purpose of this study was to analyze the removal of implant-supported crowns retained by three different cements using an air-accelerated crown remover and to evaluate the patients' response to the procedure. This controlled clinical trial was conducted with 21 patients (10 women, 11 men; mean age: 51 ± 10.2 years) who had received a total of 7...
Article
http://www.cmsa.ch/Dental/Download-Center/Dokumente?type=20367e91-ac4c-46e8-98ce-0ce303212bdf&lang=MediaArchive:15bd63ef-2822-44e0-b977-d5de05f44a57 In den vergangenen Jahren wurde der nietenförmige Einzelanker Locator für die Verankerung von Implantat-Overdentures sehr populär. Er hat unbestreitbare Vorteile. Es zeigte sich jedoch im klinischen A...
Article
Objective To compare the precision of fit of long-span vs. short-span implant-supported screw-retained fixed dental prostheses (FDPs) made from computer-aided-design/computer-aided-manufactured (CAD/CAM) titanium and veneered with ceramic. The null hypothesis was that there is no difference in the vertical microgap between long-span and short-span...
Article
AimThis study investigated the pattern of resorption of the mandibular ridge under implant-supported overdentures.Material and methodsFiles of 60 patients were available for analysis (45 women and 15 men, mean age at the time of the follow-up 76.5 ± 8.5 years, 54 patients restored with bars, 6 with ball anchors). A baseline was defined by different...
Article
Purpose: To evaluate technical complications and failures of zirconia-based fixed prostheses supported by implants. Materials and methods: Consecutive patients received zirconia-based single crowns (SCs) and fixed dental prostheses (FDPs) on implants in a private clinical setting between 2005 and 2010. One dentist performed all surgical and pros...
Article
Purpose: To evaluate and compare crestal bone level changes and peri-implant status of implant-supported reconstructions in edentulous and partially dentate patients after a minimum of 5 years of loading. Materials and methods: All patients who received a self-tapping implant with a microstructured surface during the years 2003 and 2004 at the D...
Article
Evaluation of the vertical presurgical ridge height of implants placed by sinus floor elevation procedures, the 5-year implant survival rate and the prosthetic restoration following these procedures
Article
Little information is yet available on zirconia-based prostheses supported by implants. To evaluate technical problems and failures of implant-supported zirconia-based prostheses with exclusive screw-retention. Consecutive patients received screw-retained zirconia-based prostheses supported by implants and were followed over a time period of 5 year...
Article
To compare the precision of fit of full-arch implant-supported screw-retained computer-aided designed and computer-aided manufactured (CAD/CAM) titanium-fixed dental prostheses (FDP) before and after veneering. The null-hypothesis was that there is no difference in vertical microgap values between pure titanium frameworks and FDPs after porcelain f...
Article
Objectives: This clinical study measured the dimensional changes of existing lower complete dentures due to the integration of a prefabricated implant bar. Additionally, the impact of this dimensional change on patient satisfaction and oral function was analyzed. Methods: Twenty edentulous patients (10 men/10 women; aged 65.9 ± 11.8 years) recei...
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Full-text available
The increasing demand by patients for esthetic and metal-free restorations has driven the development of ceramic restorations with good esthetic and mechanical stability. Recent clinical studies have investigated the use of zirconium dioxide as a core material for complete crowns and computer-aided-design/computer-aided-manufacturing fabricated res...
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The concept of platform switching has been introduced to implant dentistry based on clinical observations of reduced peri-implant crestal bone loss. However, published data are controversial, and most studies are limited to 12 months. The aim of the present randomized clinical trial was to test the hypothesis that platform switching has a positive...
Article
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Digital analysis of the occlusal contacts can be performed with the T­scan device (T Scan III, TekScan, Boston, USA). However, the thickness of the interocclusal T­scan sheet (100 µm) may lead to a displacement of the mandible. Thus, the aim of this study was to investigate the impact of the T­scan sheet on the position of the mandibular condyles i...
Article
Implant-overdentures supported by rigid bars provide stability in the edentulous atrophic mandible. However, fractures of solder joints and matrices, and loosening of screws and matrices were observed with soldered gold bars (G-bars). Computer-aided designed/computer-assisted manufactured (CAD/CAM) titanium bars (Ti-bars) may reduce technical compl...
Article
Optical scanners combined with computer-aided design and computer-aided manufacturing (CAD/CAM) technology provide high accuracy in the fabrication of titanium (TIT) and zirconium dioxide (ZrO) bars. The aim of this study was to compare the precision of fit of CAD/CAM TIT bars produced with a photogrammetric and a laser scanner. Twenty rigid CAD/CA...
Article
Objective: The cost-effectiveness of cast nonprecious frameworks has increased their prevalence in cemented implant crowns. The purpose of this study was to assess the effect of the design and height of the retentive component of a standard titanium implant abutment on the fit, possible horizontal rotation and retention forces of cast nonprecious...
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Objectives: Dental phobia is a psychological disease and a possible contraindication for implant therapy. The study aimed to show that implant therapy in dental-phobic patients (DP, test group) after adequate psychological and dental pretreatment (PDPT) is successfully possible and results in a similar implant prognosis as in nonfearful patients (...
Article
Full-text available
Objective To analyze the precision of fit of implant-supported screw-retained computer-aided-designed and computer-aided-manufactured (CAD/CAM) zirconium dioxide (ZrO) frameworks. Materials and methodsComputer-aided-designed and computer-aided-manufactured ZrO frameworks (NobelProcera) for a screw-retained 10-unit implant-supported reconstruction o...
Article
Full-text available
The goal of the study was to calculate the direct costs of therapy for patients with MAP. This retrospective study included 242 MAP patients treated at the Department of Prosthodontics of the University of Bern between 2003 and 2006. The following parameters were collected from the clinical charts: chief complaint, diagnosis, treatment modalities,...
Conference Paper
Objective: Biofilm infection is a main cause of many dental chronic diseases. While the antibacterial activity of quaternary ammonium compounds against oral bacteria has been well investigated, limited information is available regarding their effects on polymicrobial biofilm. The current study aimed to evaluate the bactericidal effects and acid pro...
Conference Paper
Objective: The determination of the occlusal vertical dimension (OVD) in edentulous patients is partly based on subjective judgment and thus sensitive to errors. The literature suggests that patients with complete dentures are prosthetically treated with a reduced OVD. An alternative might be to determine the OVD at a lateral cephalogram by means o...
Conference Paper
Objective: The study aimed to test the hypothesis of no influence of platform-switching on crestal bone-level-changes. Method: In a split-mouth design, two bone-level-implants (SICace, SICinvent AG, Basel, CH; diameter 4mm/ length 9.5mm) were interforaminally inserted in 32 edentulous subjects (baseline). Every subject received an implant with (3...
Article
Healthy, well-structured mucosa may clinically disguise atrophic jawbone in preimplant diagnosis. To analyze bone width in relation to the complete ridge thickness comparing the anterior with the posterior edentulous maxilla. Data of 52 patients (mean age 62 ± 9 years) who were edentulous for at least 1 year and who received implant treatment were...
Article
Full-text available
To evaluate prosthetic parameters in the edentulous anterior maxilla for decision making between fixed and removable implant prosthesis using virtual planning software. CT- or DVT-scans of 43 patients (mean age 62 ± 8 years) with an edentulous maxilla were analyzed with the NobelGuide™ software. Implants (≥3.5 mm diameter, ≥10 mm length) were virtu...
Article
Full-text available
The aim of this study was to compare data on design and fabrication methods of removable partial dentures (RPDs) in two major cities in Greece. A questionnaire was sent to 150 randomly selected dental technicians. The participation rate was 79.3%. The anterior palatal strap, the lingual bar, and the Roach-type clasp arm designs were preferred. Half...
Article
The purpose of this study was to report on the management and treatment outcomes of partially edentulous elderly patients with severe tooth wear. Partially edentulous patients with severe tooth wear who underwent the same protocols for full prosthodontic rehabilitation were eligible for this observational study. Their clinical diagnoses were based...
Article
This audit reports on the oral and general health of patients who were treated in a dental consultation clinic of a geriatric hospital. Dental and medical records were obtained from 112 female and 80 male patients (mean age, 83.7 ± 8.2 years) who attended a dental consultation. Data analysis included the general health [American Society of Anesthes...
Article
Full-text available
To analyze maintenance service of fixed maxillary prostheses and overdentures based on conventional gold bars or titanium bars and frameworks fabricated with computer-aided design/computer-assisted manufacture (CAD/CAM) technology. Forty-one patients participated; 16 received an implant overdenture with a gold bar (gold OD), 12 received a CAD/CAM-f...
Article
Background: After oral tumor resection, structural and functional rehabilitation by means of dental prostheses is complex, and positive treatment outcome is not always predictable. Purpose: The objective of the study was to report on oral rehabilitation and quality of life 2–5 years after resection of malignant oral tumors. Materials and Methods: D...
Article
This three-part article series demonstrates the advantages of computer-assisted three-dimensional implant planning followed by prosthetic procedures. Two treatment sequences (cases 4 and 5) are shown in this article. Case 4 presents the treatment outcome in a 34-year-old man with a cleft lip/palate. Case 5 deals with severe dental phobia in a 50-ye...
Article
Background: Resonance frequency analysis (RFA) is a noninvasive technique for the quantitative assessment of implant stability. Information on the implant stability quotient (ISQ) of transmucosally inserted implants is limited. Purpose: The aim of this investigation was to compare the ISQ of conventionally inserted implants by raising a muco-perios...
Article
The present study summarizes the long-term clinical observations of edentulous patients treated with mandibular implant-supported overdentures. From 1984 to 1997, edentulous patients were consecutively admitted to treatment with mandibular implant overdentures. The treatment plan was to connect the dentures to only two implants by means of single b...
Article
Full-text available
Durchgängige Ductus nasopalatini, welche die Mund- und Nasenhöhle miteinander verbinden, sind sehr selten und werden als entwicklungsbedingte Anomalie betrachtet. Klinisch zeigen sich bei einem palatinal offenen Ductus nasopalatinus eine oder zwei runde bis ovale Öffnungen lateral oder posterior der Papilla incisiva. Bei der Entscheidungsfindung im...
Article
The second article of this ongoing trilogy of case reports on the advantages of computer-assisted virtual 3D implant planning for special care patients describes treatment planning, treatment and treatment results in different situations on the basis of two case reports. Case report 2 concerns the restorative treatment for a 56-year-old patient fol...
Article
Purpose: The aim of this study was to measure stability and crestal bone level changes of implants placed in fresh extraction sockets in elderly patients. Methods: Thirty-five patients who were in need of tooth extractions were recruited for this study. They received a total of 65 implants in both jaws to support fixed or removable prostheses. The...
Article
This case series, documented by three consecutive articles, describes the implant-prosthetic procedure for the rehabilitation of special care patients. All participants had an edentulous maxilla and exhibited specific physical or psychological disabilities. The advantages of using computer-assisted, virtual 3D planning and its broad range of applic...
Article
Full-text available
The purpose of this investigation was to evaluate the effectiveness of laser acupuncture within the scope of a pilot study. 108 adult patients were examined and of those eleven patients were included in the prospective pilot study. These patients took part voluntarily and were diagnosed with tendomyopathy of the masticatory musculature with maximum...
Article
Full-text available
Dental undertreatment is often seen in the older population. This is particularly true for the elderly living in nursing homes and geriatric hospitals. The progression of chronic diseases results in loss of their independence. They rely on daily support and care due to physical or mental impairment. The visit of a dentist in private praxis becomes...
Article
Full-text available
The aim of the study was to report on oral, dental and prosthetic conditions as well as therapeutic measures for temporarily institutionalized geriatric patients. The patients were referred to the dentist since dental problems were observed by the physicians or reported by the patients themselves. This resulted in a selection among the geriatric pa...
Article
The goal of this study was to determine whether site-specific differences in the subgingival microbiota could be detected by the checkerboard method in subjects with periodontitis. Subjects with at least six periodontal pockets with a probing depth (PD) between 5 and 7 mm were enrolled in the study. Subgingival plaque samples were collected with st...
Article
Different types of titanium-alloys instead of CoCr-alloys have been tested as material for the framework of removable partial dentures (RPD). Adequate casting and processing techniques have been developed which enable to fabricate frameworks of complex designs and the problem limits porosity. This opened new possibilities for the use of titanium-al...
Article
To analyze computer-assisted diagnostics and virtual implant planning and to evaluate the indication for template-guided flapless surgery and immediate loading in the rehabilitation of the edentulous maxilla. Forty patients with an edentulous maxilla were selected for this study. The three-dimensional analysis and virtual implant planning was perfo...
Article
Full-text available
Different types of titanium-alloys instead of CoCr-alloys have been tested as material for the framework of removable partial dentures (RPD). Adequate casting and processing techniques have been developed which enable to fabricate frameworks of complex designs and the problem limits porosity. This opened new possibilities for the use of titanium-al...
Article
Little explanation is given to patients with temporomandibular disorders and muscles dysfunction on the mechanism and the expected results of conservative treatment. The purpose of this prospective study was to evaluate the efficacy of specific physical therapy prescribed after this explanation was given and also after using a flat occlusal splint...
Article
Les explications données aux patients porteurs d’un syndrome algodysfonctionnel de l’appareil manducateur (Sadam) sont en général limitées. L’étiologie et les effets attendus d’un traitement conservateur sont en général passés sous silence. Cette étude avait pour but d’évaluer de façon prospective l’efficacité de la physiothérapie spécialisée presc...
Article
Information on the impact of sample storage prior to analysis by DNA methods is limited. To investigate the effect of microbial sample storage on bacterial detection and proportional distribution of the red complex and its individual pathogens. Subgingival plaque samples were analysed by (1) immediate processing, (2) after storage at +4 degrees C f...
Article
Information on the impact of sample storage prior to analysis by DNA methods is limited. The aim of this study was to investigate the effect of subgingival sample storage on bacterial detection and enumeration. Subgingival plaque samples were studied by a) checkerboard DNA-DNA hybridization by immediate processing, b) storage at + 4 degrees C for 6...

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