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Introduction
Skills and Expertise
Publications
Publications (104)
This study aims to assess the dimensional accuracy of complete denture bases fabricated from different CAD/CAM technologies and a conventional method, including milling (CNC), PolyJet (PJ), laser sintering (SLS), digital light processing (DLP), and injection molding (IM). It also examines the influence of the removal of technology-specific connecto...
Objectives
Clinical data on all‐ceramic screw‐retained implant crowns (SICs) luted on titanium base abutments (TBAs) over more than 3 years are sparse. This study aimed to evaluate the clinical performance and potential risk factors for these restorations.
Materials and Methods
Analysis took place based on the medical patient‐records of three dent...
Purpose: This in vitro study investigated the influence of material selection, crown morphology, and vertical crown height on the biomechanical behavior of monolithic hybrid abutment crowns (HACs).
Methods: Ninety implants were embedded in accordance with ISO standard 14801; ninety HACs were mounted (N=90). Monolithic crowns with varying group-spec...
Purpose:
To evaluate the behavior of hybrid abutment crowns fabricated from monolithic lithium disilicate ceramic (LDC) and to compare the influence of different in-vitro artificial aging protocols.
Material and methods:
32 monolithic hybrid abutment crowns of monolithic LDC were fabricated. 24 were artificially aged applying 3 different protoco...
Objectives:
Bone resorption around implants could influence the resistance of the implant abutment complex (IAC). The present in vitro study aimed to assess the stability to static fatigue of implants presenting different levels of bone losses and diameters.
Materials and methods:
Ninety implants with an internal conical connection with 3 differ...
Objective:
The present study aimed to compare histomorphometrically evaluated new bone formation, radiographically measured graft stability, and clinical implant outcome between maxillary sinus grafting with either deproteinized porcine bone mineral (DPBM) or deproteinized bovine bone mineral (DBBM).
Materials and methods:
Thirty maxillary sinus...
Objectives:
To evaluate the clinical outcome for implants placed with transsinusoidal-lateral nasal cavity augmentation (NA) compared to implants placed in maxillary sinus augmentation (SA).
Materials and methods:
In 28 atrophic edentulous maxillary regions (14 patients bi-maxillary), a lateral window approach was used to perform transsinusoidal...
Objective:
Several extrusion techniques have been described to restore teeth with insufficient coronal tooth structure and to avoid their extraction. Still, there is little evidence for a treatment concept combining surgical extrusion using an atraumatic axial extraction system.
Materials and methods:
A total of nine patients, each with an iso-...
Objective:
This article highlights a CAD/CAM complete-mouth rehabilitation in an 82-year-old patient by means of a complete maxillary prosthesis and mandibular implant- and tooth-supported fixed restorations made from multilayered zirconia.
Clinical considerations:
Comprehensive complete-mouth rehabilitations in elderly patients with adaptation...
Implantatgetragener Zahnersatz bei zahnlosen Patienten kann herausnehmbar − mit unterschiedlichsten Verankerungselementen − oder festsitzend gestaltet werden. Art und Umfang der langfristig zu erwartenden Komplikationen beeinflussen entscheidend die Therapieform. Um diese abzuschätzen, wurden 14 implantatgetragene festsitzende Versorgungen (FZE) mi...
ZUSAMMENFASSUNG Parodontologen sowie Prothetiker werden zukünftig aufgrund der demografischen Entwicklung vermehrt mit komplexen Planungen von verschiedenen Lückengebisssituationen im parodontal kompromittierten Gebiss konfrontiert sein. Das synoptische Behandlungskonzept bildet die Grundlage für eine langfristig erfolgreiche kaufunktionelle und äs...
Zirkonoxid ist schon seit einigen Jahren ein Restaurationsmaterial, das bei Patienten, aber vor allem auch bei den Zahntechnikern und Zahnärzten eine hohe Beliebtheit erfährt. Dies hat diese Dental-keramik nicht nur ihren guten ästhetischen, sondern besonders den hervorragenden mechanischen Eigenschaften zu verdanken, die denen der Silikatkeramiken...
Purpose: This in vitro study aimed to investigate the long-term performance, stability, and fracture mode of monolithic hybrid abutment crowns, and the effect of different materials on the implant-abutment interface (IAI).
Methods: Eighty monolithic hybrid abutment crowns luted on titanium bases were manufactured from 3Y-TZP zirconia (ZY3), “Gradie...
Purpose: Based on the excellent long-term data, dental implants made of titanium are considered the international implantological standard for replacing missing teeth. However, ceramic implants made of zirconia (ZrO2) have experi- enced a renaissance in the last 15 years due to constant innovations in materials and products, with material proper- t...
Background:
Treatment of the edentulous maxilla with a fixed full-arch prosthesis on four immediately loaded implants has been discussed as a treatment option, although generally five implants are recommended for that indication. The precise transfer of the virtually planned position by 3D-guided implant placement is an essential prerequisite for...
Purpose:
To retrospectively compare the incidence of biologic and prosthetic complications in implant-supported fixed dental prostheses (FDP) and removable dental prostheses (RDP) in edentulous patients after up to 10 years.
Materials and methods:
A total of 13 patients (mean age: 58.8 years, women = 9, men = 4) who had received 14 implant-suppo...
Objectives
To evaluate the peri-implant marginal bone level for immediately loaded implants placed simultaneously in both fresh extraction sites (FES) and healed sites (HS) supporting a 4-implant supported mandibular fixed prosthesis (4-ISFMP) using the all-on-4 concept.
Material and Methods
A 5-year prospective study was conducted in 24 patients...
ENGLISH: The number of single-tooth implants has been steadily increasing in recent years, so that their superstructures have to prove themselves for a wider range of patients than ever in terms of longevity, esthetics, and function. The combination of CAD/CAM technology and new restorative materials especially enables innovative and efficient ther...
Purpose: The aim of this study was to evaluate the stability of single crowns and 3-unit bridges in relation to the implant-abutment complex with and without tube in tube connection.
Methods: 60 specimens with a total of 90 implants (diameter 3.8 mm) were fabricated and distributed into 4 groups: CST (Crown with short tube), CLT (crown with long tu...
Purpose:
Bone augmentation and implant placement often lead to a coronal shift of the soft tissue. Therefore replacement of the mucogingival border during second-stage surgery is required. Different techniques have been described in the literature.
Material and methods:
In this case report a new technique for second-stage surgery from a combinat...
Purpose:
To report on pilot tests for a planned study on single implant-supported crowns made from different restorative materials using finite element analysis (FEA) and in vitro load-to-failure testing.
Materials and methods:
Within this pilot study, FEA was conducted using Ansys 2019 R2 to simulate stress and deformation for implant-supported...
Objectives
To measure the abutment rotation and fracture load of two-piece zirconia implants screwed with three different abutment screw materials.
Material and methods
Thirty-six zirconia implants with 36 zirconia abutments were distributed into 3 test groups: group G connected with gold screws, group T with titanium screws, and group P with peek...
Die Einführung der Adhäsivtechnik in Kombination mit zahnfarbenen Restaurationsmaterialien zählt zu den größten Errungenschaften der restaurativen Zahnheilkunde. Dazu haben adhäsiv befestigte Veneers auf der Basis verschiedener silikatkeramischer Materialien ganz wesentlich beigetragen. Sie haben sich zu einer ernsthaften Behandlungsalternative zu...
Today, implant-retained restorations need to fulfill esthetic and functional objectives and have become increasingly important in the practice of modern dentistry. They should integrate into a versatile environment and result in a natural, harmonious appearance. This environment comprises teeth, soft tissue (gingiva), and the surrounding lips, whic...
The introduction of adhesive techniques in combination with translucent restorative materials has greatly influenced treatment concepts in fixed prosthodontics. Modern production technologies offer access to new polymer materials that provide innovative pre-treatment options for complex prosthetic rehabilitations. Additionally, computer-aided desig...
Modern oral implantology and implant prosthetics depend on comprehensive diagnostics and precise planning to ensure the desired outcome and meet the patient's and the dentist's expectations. In this context, digital implant planning and guided implant surgery based on three-dimensional radiographic data and the digitised intraoral surfaces can be o...
Purpose
Evaluating the extent of and the factors affecting marginal bone level (MBL) alterations and consecutively implant success and implant health for implants placed in staged maxillary sinus floor (SF) augmentation.
Materials and Methods
A 5‐year prospective, cohort study was conducted on 85 patients with 124 maxillary sinus augmentation proc...
In many areas of restorative dentistry, metal-free materials offer an alternative to metal-based restorations while ensuring high levels of biocompatibility and esthetics. Rapidly evolving CAD/ CAM technology has significantly expanded the range of materials available, providing access to materials classes and their combinations not previously avai...
In many areas of restorative dentistry, metal-free materials offer an alternative to metal-based restorations while ensuring high levels of biocompatibility and esthetics. Rapidly evolving CAD/CAM technology has significantly expanded the range of materials available, providing access to materials classes and their combinations not previously avail...
This case report introduces a temporary denture with reduced extension stabilized in the edentulous maxilla as a possible treatment method for patients with a severe gag reflex, allowing them to test the function, esthetics, and tolerance of the denture prior to hard tissue augmentation and implant placement. A 4-mm implant was placed in the centra...
Purpose:
To evaluate the 5-year clinical outcomes for implants placed in a staged sinus floor elevation (SFE) procedure and to compare three patient groups with sinus grafts with three different ratios of bovine bone mineral (BBM) and autogenous bone (AB) mixture.
Materials and methods:
A 5-year prospective cohort study was conducted on 81 patie...
Adhesive bonding techniques in combination with tooth-colored restorative materials are one of the greatest achievements of restorative dentistry. Adhesively bonded veneers made from various silicate ceramic materials have contributed significantly to this. Ceramic veneers had long been considered to be only esthetic implements. However, their rang...
In many areas of restorative dentistry, metal-free materials offer an alternative to metal-based restorations while ensuring high levels of biocompatibility and esthetics. Rapidly evolving CAD/CAM technology has significantly expanded the range of materials available, providing access to classes and combinations of materials not previously availabl...
Innovative digital diagnostic, design, and manufacturing technologies combined with high-performance polymers offer new possibilities to facilitate complex interdisciplinary treatment procedures. This article reports on the interaction of different digital technologies, from presurgical digital simulation of periodontal surgery to final prosthodont...
Objectives:
Computer-aided technologies can help to minimize clinical complications of zirconia-based restorations such as veneering porcelain fractures. The aim of this study was to evaluate different veneering approaches for zirconia single crowns regarding contact wear, fracture strength, and failure mode.
Methods:
Six different types of comp...
Objectives
Direct and indirect digitalization offer two options for computer-aided design (CAD)/ computer-aided manufacturing (CAM)-generated restorations. The aim of this study was to evaluate the accuracy of different intraoral scanners and compare them to the process of indirect digitalization.
Material and method
A titanium testing model was di...
In vielen Bereichen der Implantologie bieten digitale Technologien wesentliche Vorteile. Angefangen bei der digitalen Implantationsplanung und Verfahren der navigierten Chirurgie über die digitale Abformung von Einzelzahnimplantaten bis hin zum CAD/CAM-gefertigten Zahnersatz („computer-aided design/computer-aided manufacturing“) aus homogenen bioko...
Purpose:
The aim of this study was to evaluate the fit and mechanical stability of conventional versus passive fitting 3-unit fixed dental prosthesis (FDP) screw-retained on implants.
Methods:
Twenty acrylic models, each with two embedded implants, were fabricated and functioned as patient-models. Impressions were taken and 20 all-ceramic FDPs w...
Pretreatment with occlusal splints is a crucial step in a structured treatment approach for a complex rehabilitation that changes the vertical dimension of occlusion. Meticulous patient compliance is one of the essential prerequisites for overall treatment success. However, patient compliance is all too often insufficient due to esthetic, phonetic,...
Digital technology significantly changed the working sequences in restorative dentistry over the last two decades. In particular in the dental laboratory new fabrication techniques and materials were introduced. As implants represent high demands on prosthodontics in terms of mechanical stability and accuracy the advantages of digital fabrication m...
Objective:
To test the mechanical properties of three different restorative materials for implant abutments supporting all-ceramic single crowns.
Materials and methods:
Thirty implants with butt-joint connections were distributed into three test groups: Group A with 10 one-piece zirconia abutments, Group U with 10 titanium abutments, and Group T...
Objectives:
CAD/CAM-fabricated long-term temporary restorations from high-density polymers can be applied for a wide range of indications. Milled from monolithic, mono-colored polymer blocks, the translucency of the material plays an important role for an esthetically acceptable result. The aim of this study was to compare the transmittance throug...
The creation of dental restorations with natural appearance and biomechanics represents a major challenge for the restorative team. The manufacturing-process of high-aesthetic restorations from tooth-coloured restorative materials is currently dominated by manual manufacturing procedures and the outcome is highly dependent on the knowledge and skil...
Single-retainer resin-bonded fixed dental prostheses (RBFDPs) are difficult to position due to the pressure of soft tissue at the pontic area and the single-retainer design. This clinical report describes an innovative technique for the insertion of single-retainer RBFDPs. An incisal inserting splint is used to position the RBFDPs reliably. With th...
Objectives:
This case series compared the clinical survival of tooth-implant-supported (TI-S) and tooth-supported (T-S) three-unit fixed dental prostheses (FDPs) with zirconia frameworks and described the incidence of biological and technical complications.
Materials and methods:
Forty-four patients received 27 TI-S FDPs and 22 T-S FDPs. Twenty-...
Purpose:
This prospective study evaluated the clinical and radiographic outcome of distally cantilevered 4-implant-supported fixed mandibular prostheses (4-ISFMP) with distal implants either in axial or distally tilted direction.
Material and methods:
Forty-one mandibulary edentulous patients received acrylic veneered 4-ISFMP with casted framewo...
Der Zahn der Zeit nagt auch am Gebiss. Je älter wir werden, desto größer ist der mechanische Verschleiß. Doch auch jüngere Patienten und sogar Kinder sind schon betroffen, z. B. durch übermäßigen Konsum säurehaltiger Softdrinks. Wie kann die Biokorrosion aufgehalten werden? Welche restaurativen Möglichkeiten gibt es bei weit fortgeschrittenen Stadi...
Minimally invasive treatment options have become increasingly feasible in restorative dentistry, due to the introduction of the adhesive technique in combination with restorative materials featuring translucent properties similar to those of natural teeth. Mechanical anchoring of restorations via conventional cementation represents a predominantly...
Objectives: Presentation of a systematic procedure for the restoration of complex implant supported restorations was the goal of this case report. Complex cases include all fields of modern dentistry as conservative, periodontal, surgical, orthodontic and restorative treatments. Hence, only a systematic treatment plan and approach can show a predic...
Background:
Peri-implant marginal bone-level (MBL) alteration represents one of the parameters included in the criteria for determining implant health.
Objective:
Factors affecting peri-implant MBL alteration for 4-implant-supported fixed mandibular prostheses (4-ISFMP) were assessed.
Material and methods:
A 3-year prospective, cohort study wa...
Objectives
To evaluate the marginal and internal fit of CAD/CAM-generated frameworks for 4-unit, fixed dental prostheses (FDPs) from zirconia (Z) and cobalt-chromium alloy (C) made with conventional (CI) and digital impressions (DI).
Materials and methods
A titanium model was digitized with an intraoral scanner (DI, LAVA™ C.O.S.; 3M ESPE; Seefel...
Implant prosthodontics offers multiple clinical options. There is one crucial question that has not been completely solved: is screw-retention or cementation of implant-supported restorations superior? This question may be answered differently depending on the background and experience of the practitioner, and there are good arguments for both conc...
PurposePrecise implant-supported restorations require accurate impressions. Transfer, pick-up, and splinted pick-up are commonly used techniques. Several in vitro studies have compared these impression techniques; however, all studies used mechanical evaluation methods. The purpose of this study was to compare the discrepancies of these impression...
Full-contour zirconia restorations are gaining in popularity. Highly translucent zirconia materials and multi-coloured zirconia blocks might help to overcome the aesthetic drawbacks of traditional zirconia. This study evaluated the transmittance of visible light (400-700 nm) through the four different layers (Enamel Layer EL, Transition Layer 1 TL1...
Die Kombination der Adhäsivtechnik mit zahnfarbenen Restaurationsmaterialien ermöglicht der restaurativen Zahnheilkunde die Umsetzung minimalinvasiver Therapiekonzepte. Konventionelle Vorgehensweisen, die eine mechanische Verankerung der Restauration mit klassischen Zementen in den Vordergrund stellen, werden zunehmend durch vornehmlich defektorien...
The identical replication of adjacent teeth creates the illusion of “natural-identical” restorations.
Single maxillary anterior teeth, especially the central incisor, cannot be successfully realized as monolithic
crowns, as these cannot adequately mimic the individually layered structure of anterior teeth. Here
the craftsmanship of an experienced d...
Objective: The digital fabrication of dental restorations on implants has become a standard procedure during the last decade. Concepts avoiding abutment change during prosthetic treatment have been shown to be superior to the traditional protocol. The presented concept for implant-supported single crowns describes a digital approach without a physi...
The digital fabrication of dental restorations on implants has become a standard procedure during the last decade. Avoiding changing abutments during prosthetic treatment has been shown to be superior to the traditional protocol. The presented concept for implant-supported single crowns describes a digital approach without a physical model from imp...
Die Herstellung von naturidentischem und damit ästhetischem Zahnersatz im Frontzahnbereich gilt sicherlich als „Königsdisziplin“ in der zahnärztlichen Prothetik. Die Anfertigung im zahntechnischen Labor wird meist von in der Schichttechnik erfahrenen Zahntechnikern durchgeführt. Speziell der Ersatz eines einzelnen mittleren Schneidezahns im Oberkie...
The soft tissues around dental implants are enlarged compared with the gingiva because of the longer junctional epithelium and the hemidesmosonal attachments are fewer, suggestive of a poorer quality attachment. Inflammatory infiltrates caused by bacterial colonization of the implant‐abutment interface are thought to be one of the factors causing e...
This case series evaluated the graft stability and resorption of a modified shell technique for horizontal ridge augmentation. Autogenous bone shells of 1-mm thickness were fixed with microtitanium screws with the gaps between the shells and ridge filled with autogenous bone chips. In 22 patients, 30 cases were performed to augment 50 regions. Fort...
Vertical defects of the alveolar crest limit implant placements. Accordingly, hard tissue grafting is essential in a separate procedure before implant placement; however, the outcome of vertical bone augmentation is unpredictable.
This case report describes a new approach to vertical hard tissue grafting using the modified autogenous shell techniqu...
Various treatment concepts have been presented for the edentulous mandible. Manufacturing tension-free and precisely fitting bars on dental implants was previously a great challenge in prosthetic dentistry and required great effort. Modern computer aided design/computer aided manufacturing technology in combination with some clinical modifications...
Introduction: After tooth loss, bone-volume and soft-tissue resorption usually occur. The goal of alveolar healing is the maintenance of hard and soft tissues. Bone resorption can be reduced by hard tissue augmentation. In combination with alveolar socket seal, the ridge preservation technique supports bone regeneration. The combined epithelial sub...
The aim of this study was to compare the light translucency and fluorescence 5 manually and 11 CAD/CAM polymer materials to a glass-ceramic material. Light-transmission was measured using a spectrophotometer. Overall light transmission (n=40) was calculated as the integration (tc (λ) dλ [10(-5)]) of all tc values for the wavelengths from 400 to 700...
Creating dental restorations as close as possible to the natural tooth structure is still an important issue when using digital fabrication technologies. Tooth-colored implant abutments have been used for almost two decades in two-piece implant systems. They showed significant advantages concerning illumination of the soft tissue as well as a tooth...
The Association for Dental Education in Europe (ADEE) makes recommendations regarding the skills graduates of European dental schools need to achieve and advises dental schools regarding necessary changes to be made to the curriculum. In 2010 to 2011, a survey was conducted in German-language dental schools to validate the curricula and goals of pr...
Objectives
The aim of this in vitro study was to evaluate the marginal and internal fit of CAD/CAM-generated four-unit zirconia fixed dental prostheses made with digital and conventional impressions.
Materials and method
A titanium master model was used. For group conventional impression (CI), 12 polyether impressions of the master model with Impre...
Purpose:
The purpose of this study was to determine the fatigue and fracture strength of zirconia implant abutments connected to titanium cores (ZrTi) and one-piece zirconia implant abutments (Zr).
Materials and methods:
Thirty-two implants were secured into epoxy resin blocks and connected with abutments. Eight specimens of each group (Zr with...
Implant-supported prosthetic restorations with veneered crowns and fixed dental prostheses are a proven, scientifically accepted treatment concept in fixed prosthodontics. However, in this area of indication there is a comparatively high technical complication rate, which occurs mainly in the area of the superstructure in the form of minor or major...
Analog dem Anstieg der Zahl der Implantationen wachsen auch die Zahlen der Komplikationen und Misserfolge. Frühkomplikationen sind oftmals Folgen der chirurgischen Therapie. Hierbei handelt es sich um Knochendefekte und/oder Implantatverluste aufgrund einer intraoperativ induzierten bakteriellen Infektion oder auch einer möglichen Knochenschädigung...
Thin facial soft tissue may lead to visible soft tissue discoloration around implants and therefore to esthetic deficiencies. The aim of this article is to present a surgical approach to peri-implant soft tissue discoloration caused by the shinethrough effects of restorative materials in the anterior maxilla. A clinical case is used to illustrate t...
Abutment material selection may have an effect on the color of the peri-implant soft tissue, especially in thin mucosa. The objective of this in vitro study was to investigate the effect of titanium, zirconia, and dyed fluorescent zirconia on the color of 1.5-mm-thick mucosa. Ten pig maxillae were used to simulate thin mucosa according to a previou...
Objectives
Precise implant-supported prosthodontics requires accurate impressions. Many in vitro studies comparing different implant impression techniques were performed. The purpose of this in vivo study was to compare the discrepancy of two different impression techniques of implants clinically.
Material and methods
Four implants were inserted ne...
The purpose of this study was to determine and measure the wear of the interface between titanium implants and one-piece zirconia abutments in comparison to titanium abutments.
6 implants were secured into epoxy resin blocks. The implant interface of these implants and 6 corresponding abutments (group Zr: three one-piece zirconia abutments; group T...
Objective
The aim of this study was the evaluation of preparations from general dental practitioners for zirconia crowns and their correlation with clinical recommendations using a digital approach.
Material and method
Seventy-five datasets of left first upper molars (FDI 16) prepared for single zirconia crowns by general dental practitioners were...