Christian Ulm

Christian Ulm
University Clinic of Dentistry, Medical University of Vienna, Vienna, Austria · Division of Oral Surgery

Doctor of Medicine

About

135
Publications
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3,611
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Publications

Publications (135)
Article
Full-text available
This study compared the outcome of fixed prostheses supported by short implants (<8 mm) and longer implants (≥8 mm) with an elevated sinus floor after 5 years of follow-up. The literature searches were performed electronically and manually in PubMed, EMBASE, and Web of Science databases to identify relevant articles published from 1 January 2013 to...
Article
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Objective: Iliac crest autografts can compensate for severe mandibular atrophy before implant placement. However, the implant success in the augmented bone is not entirely predictable. Here we performed a retrospective cohort study to determine the success and related parameters of implants placed in augmented bone and pristine bone for up to 11 y...
Article
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During the coronavirus disease 2019 (COVID-19) pandemic, aerosol-generating procedures, including dental implant treatments, are considered high-risk. With dental implant treatment mostly an elective procedure, we aimed to assess whether the pandemic influenced patient selection, surgical procedures, and postoperative complications. We compared den...
Article
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Objectives: Buccal bone augmentation in the esthetic zone is routinely used to achieve optimal clinical outcomes. Nonetheless, long-term data are sparse, and it is unknown how baseline buccal bone volume affects the retention of the augmented volume over time. Material and methods: This is a long-term follow-up retrospective case series. After a...
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Topical cyclosporine (CSA) has been reported as an alternative treatment in steroid-refractory oral lichen planus (OLP), but evidence is limited and conflicting. An N-of-1 trial setting could be appropriate to evaluate interindividual differences in treatment response. We studied a series of 21 open-label, biphasic single-patient observations. Pati...
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Objectives With only limited information available on dimensional changes after jaw cyst surgery, postoperative cyst shrinkage remains largely unpredictable. We aimed to propose a model for volumetric shrinkage based on time elapsed since cyst surgery. Material and methods We used data from patients that underwent cyst enucleation or decompression...
Article
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GBR (guided bone regeneration) is a standard procedure for building up bony defects in the jaw. In this procedure, resorbable membranes made of bovine and porcine collagen are increasingly being used, which, in addition to many possible advantages, could have the potential disadvantage of a shorter barrier functionality, especially when augmenting...
Article
OBJECTIVES: The extraction of impacted mandibular third molars is a common surgical procedure often associated with complications including post-traumatic neuropathy. Previous work has focused on identifying confounding factors, but a robust preoperative risk prediction model remains elusive. METHODS: Using a dataset of 648 patients and 812 impacte...
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OBJECTIVES Resonance frequency analysis (RFA) is used to monitor implant stability. Its output, the Implant Stability Quotient (ISQ), supposedly correlates with insertion torque, a common measurement of primary stability. However, the reliability of RFA in condensed bone remains unclear. MATERIAL AND METHODS In this human cadaver study in edentulo...
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Objectives The dental alveolus is lined by a thin cortical layer (“bundle bone”, “alveolar bone proper”, “cribriform plate”, “lamina dura”), that can impede access to the bone marrow and its vasculature. During unassisted socket healing, the alveolar bundle bone is gradually resorbed allowing tissue resources from the bone marrow to enter into the...
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Objectives To assess the reliability of judging the spatial relation between the inferior alveolar nerve (IAN) and mandibular third molar (MTM) based on MRI or CT/CBCT images. Methods Altogether, CT/CBCT and MRI images of 87 MTMs were examined twice by 3 examiners with different degrees of experience. The course of the IAN in relation to the MTM,...
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Due to the rising demand for zirconia (Zr) based implant systems, it is important to understand the impact of Zr and titanium (Ti) implants and particularly their topography on soft tissue healing. As human gingival fibroblasts (hGFs) are the predominant cells in peri-implant soft tissue, we focused on examining the effect of implant material and s...
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Objectives Completion of adolescent growth represents the earliest time point for implant placement, yet craniofacial growth persists into adulthood and may affect implant position. We aimed to assess whether implants placed in the anterior maxillae of adults show angular changes over time.Material and methodsWe conducted a cephalometric pilot stud...
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Aim To evaluate implant survival and marginal bone levels (MBLevel) at least 5 years after implant installation in patients ≥ 65 years old. Methods Patient records were screened retrospectively for the following inclusion criteria: (1) ≥ 65 years of age at the time of implant installation, and (2) ≥ 5‐year radiographic follow‐up or registered impl...
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Background Collagen scaffolds are widely used for guided bone or tissue regeneration. Aiming to enhance their regenerative properties, studies have loaded various substances onto these scaffolds. This review aims to provide an overview of existing literature which conducted in vitro, in vivo, and clinical testing of drug-loaded collagen scaffolds a...
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Background: Maxillary sinus floor augmentation (MSFA) is a well-established and predictable augmentation method in severely resorbed maxillae. However, data on the vertical course of bone graft consolidation within the maxillary sinus are rare. The aim of the present study was to quantify the vertical distribution of new bone formation in MSFA and...
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Objectives Risk prediction in implant dentistry presents specific challenges including the dependence of observations from patients with multiple implants and rare outcome events. The aim of this study was to use advanced statistical methods based on penalized regression to assess risk factors in implant dentistry. Material and Methods We conducte...
Article
Introduction The aim was to present a novel surgical technique using virtually pre-planned 3D printed templates for guided osteotomies. These were to ensure atraumatic uncovering of a severely impacted donor tooth including guided drilling of the recipient alveolus followed by a secure autotransplantation procedure. Methods This report presents an...
Article
The purpose of this article is to present a guided lateral window sinus lift (GLSL) procedure with the aid of a fully digital workflow using surgical templates for window osteotomy preparation and implant placement. A 22-year old patient with insufficient residual bone height in the posterior maxilla was treated with a maxillary sinus augmentation...
Preprint
Objectives: Completion of adolescent growth represents the earliest time point for implant placement, yet craniofacial growth persists into adulthood and may affect implant position. We aimed to assess whether implants placed in the anterior maxillae of adults show angular changes. Methods: We conducted a cephalometric pilot study in postpubertal p...
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Background. A high resorption rate of autogenous bone is a well-documented phenomenon that can lead to insufficient bone quality and quantity in an augmented area. Nonresorbable bone substitutes might perform better than autogenous bone in certain applications if they are able to provide adequate bone formation and graft osseointegration. Purpose....
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Objectives: To assess, retrospectively, whether older age has an impact on implant osseointegration when compared with younger age. Methods: All patients ≥65 years old at implant installation, in an university setting over a time-period of 11.5 years, with complete anamnestic data and follow-up until prosthetic restoration were included and any...
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Objectives To perform a within-subject comparison of the cortical bone micro-architecture of the maxillary sinus floor (MSF) to that of the buccal aspect of the anterior and posterior maxilla. Methods Micro-CT scans of the buccal aspect of the anterior and posterior maxilla and of the MSF in 14 human anatomical specimens were recorded. Within-subj...
Article
Objectives The bucco‐palatal sinus width (SW) appears as relevant factor for graft consolidation after maxillary sinus (MS) floor augmentation. The present study aimed to assess a) SW at different height levels of posterior teeth, b) possible factors influencing SW, and c) whether a simple/meaningful sinus classification based on SW is possible. M...
Article
Objectives Literature regarding congenitally-missing-teeth (CMT) is lacking especially on CMT-patterns. Thus, the aim of this study was to present an in-depth analysis of 843 patients with CMT treated at a single-center over the past thirty years. Design Age, date-of-birth-year, gender, medical- and family-history, CMT-types, -numbers, -severity,...
Article
Objectives: Type 2 diabetes mellitus (T2DM) is a systemic disease that also compromises the bone healing capacity. In healthy individuals, surface modifications of dental implants are proven to increase bone response and implant success. The aim of this study was to clarify if the surface modifications also improve osseointegration in a setting wi...
Article
Background: Elevation of the schneiderian membrane, during maxillary sinus floor augmentation (MSFA) may theoretically result in devitalization of adjacent teeth, which are in a close spatial relationship to the sinus floor. Purpose: To assess retrospectively the probability of devitalization of teeth adjacent to the osteotomy site after MSFA in...
Article
Introduction: Sinus floor augmentation is a routinely used surgical technique for increasing the bone height/volume of the atrophic posterior maxilla. Optimal integration of the implanted augmentation material within the newly formed bone will-at least partly-depend on adequate vascularization to ensure sufficient recruitment of osteoblast and ost...
Article
Objectives: To compare the alveolar bone dimensions in patients with lower second premolar (P2) agenesis prior to and after primary molar loss on CT scans, and assess the possibility for straightforward implant placement. Methods: Alveolar bone dimensions were evaluated on 150 mandibular CT scans in three groups: (i) agenesis of P2, with the pri...
Article
Background: Autotransplantation of teeth (TX) is a predictable treatment option, although this type of therapy is often overlooked compared to other types of restorations. Purpose: As current literature contains few long-term studies concerning the outcome of autotransplanted immature molars, the aim was to evaluate results after a follow-up per...
Article
Objectives: The aim of this study was to perform a histomorphometric evaluation of the healing characteristics and jawbone remodeling processes in the peri-implant bone tissue of three commonly used implant surfaces, during the early weeks of osseointegration. Material and methods: Dental implants with three different surfaces (anodically modifi...
Article
Introduction: Continuous improvements in techniques, instruments, and materials have established modern endodontic microsurgery as a state-of-the-art treatment method. The purpose of this approach was to introduce a new surgical endodontic technique by using a three-dimensional printed template for guided osteotomy and root resection. Methods: A...
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The aim of this study was to compare mandibular form (i.e., size and shape) between patients with agenesis of the lower second premolar (P2) and a control group with no agenesis. Three hypotheses were tested: (H1) agenesis causes a change in mandibular morphology because of inadequate alveolar ridge development in the area of the missing tooth (man...
Article
Introduction: The aim of this study was to introduce an innovative method for autotransplantation of teeth using 3-dimensional (3D) surgical templates for guided osteotomy preparation and donor tooth placement. Methods: This report describes autotransplantation of immature premolars as treatment of an 11-year-old boy having suffered severe traum...
Article
Objectives: To evaluate (i) a possible correlation between the mesio-distal gap width and the alveolar ridge (AR) dimensions in patients missing the maxillary lateral incisor (I2) either due to agenesis or loss and (ii) the possibility of straightforward implant placement based on simulation. Methods: The bucco-palatal width, area, and height of...
Article
Aim: This study systematically evaluates existing evidence-based literature covering the topic of patient information about different treatment alternatives for missing single teeth, in order to summarise current evidence. Material and methods: Three scientific databases - Pubmed, OvidSP and Scopus - were searched for publications up to July 2015,...
Article
Sinus augmentation is a standard procedure to increase vertical bone supply for dental implants in the atrophic posterior maxilla. Despite the longstanding application of this method, information about some basic factors that could potentially influence bone regeneration after sinus augmentation is rare. The objective of this study was therefore to...
Article
Objectives Sinus augmentation is a standard procedure to increase vertical bone supply for dental implants in the atrophic posterior maxilla. Despite the longstanding application of this method, information about some basic factors that could potentially influence bone regeneration after sinus augmentation is rare. The objective of this study was t...
Article
Background: The relevance of an adequate primary stability as a factor for osseointegration was described by many. A possible correlation between primary stability and peri-implant bone density measured within the 3D planning software was not evaluated so far. Aim/Hypothesis: Aim of this study was to evaluate the possibility of predicting the prima...
Article
Background: Whether the composition of palatal connective tissue grafts (CTGs) varies depending on donor site or harvesting technique in terms of relative amounts of fibrous connective tissue (CT) and fatty/glandular tissue (FGT) is currently unknown and is histologically assessed in the present study. Methods: In 10 fresh human cadavers, tissue...
Article
Background Congenitally missing teeth (CMT) are a common oral anomaly. Apart from the aesthetic problems, the limitations in the daily life and the psychosocial aspects, oral rehabilitation is time-consuming, expensive and often requires several surgical interventions. Therapy The treatment, especially the surgical approach, primarily depends on th...
Article
In the severely atrophied maxilla, implant anchorage in the zygomatic bone is considered a viable alternative to conventional dental implants with preceding bone augmentation procedures. The present microCT-based study compared the trabecular bone quality of the maxilla and zygomatic bone. MicroCT scanning was conducted in 12 halves of cadaver head...
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Purpose: To test patient- and sinus-related risk factors for an association with intraoperative membrane perforation and postoperative complications after sinus floor augmentation surgery. Materials and Methods: Sinus floor elevation procedures using a lateral approach were retrospectively analyzed for patients' medical history and sinus anatomy on...
Article
CT assessment of the entire course of the inferior alveolar artery (IAA) within the mandibular canal. After contrast medium injection (180 or 400 mg/ml iodine concentration) into the external carotid arteries of 15 fresh human cadaver heads, the main IAA's position in the canal (cranial, buccal, lingual or caudal) was assessed in dental CT images o...
Article
Miller's is the most commonly used classification of gingival tissue recessions, defined as the displacement of the soft tissue margin apical to the cemento-enamel junction. However, data on the reliability of this classification are missing so far, although reliability, which reflects the consistency of repeated measurements, is regarded as a prer...
Article
Adaptations of the alveolar ridge after tooth loss have been well described. However, studies on the morphometric characteristics of cortical bone are rare; hence, this study of human atrophic edentulous mandibles was undertaken. Total cortical area, porosity, and thickness, and the percentage of cortical area in the complete mandibular area as wel...
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There is a lack of consensus guidelines for the decontamination of autogenous bone grafts after exposure to a nonsterile environment during graft contouring, intraoral bone harvesting, or when inadvertently dropped off the sterile field. Transplantation of contaminated bone may cause infectious complications or even augmentation failure. When selec...
Article
Objectives: Initial implant stability is one of the fundamental criteria for obtaining osseointegration. The aim of this study was to establish a correlation between the primary stability of short and normal implants placed in different types of bone density. Methods: A total of 60 Nobel Biocare implants (Göteborg, Sweden®) of different length and...
Article
Die bei Weitem häufigste Ursache einer odontogenen Sinusitis maxillaris sind Mund-Antrum-Verbindungen nach Zahnentfernungen, die zu aufsteigenden Infektionen der Kieferhöhle führen. Weitere häufige Ursachen sind die periapikale rarefizierende Ostitis, Fremdkörper dentogenen Ursprungs, weit fortgeschrittene parodontale Abbauprozesse, odontogene Zyst...
Article
Background: Perforation of the maxillary sinus membrane in the course of sinus floor augmentation represents the most frequent intraoperative complication regardless of the surgical technique used. Laser-assisted osteotomy of the lateral sinus wall may offer an alternative treatment approach, however, reports addressing this surgical technique are...
Article
Background: Maxillary sinus septa are barriers of cortical bone that divide the maxillary sinus floor into multiple compartments, known as recesses. Aim/Hypothesis: To gain further insights and resolve conflicting results in the literature regarding prevalence, predominant location and morphologic variability of maxillary sinus septa. Material and...
Article
The palatal sinus lift is a good choice for patients with scarred buccal soft tissue and those with poor wound healing such as smokers or diabetics or when visual side effects such as swelling must be concealed. We provide a surgical protocol for palatal sinus lifting without a vertical release incision. The incision is started in a slightly palata...
Article
Background: Therapeutic decisions in periodontal surgery are based on the accurate diagnosis of the furcation. Clinical probing is the basic diagnostic tool; however, the accuracy of clinical probing to distinguish Class II and Class III furcation defects is unknown. Therefore, this study compares clinical probing diagnoses to those of computed to...
Article
Objectives Knowledge of the position and configuration of the mandibular canal is a basic requirement before implant placement in the mandible. Radiological studies suggest a positive correlation between alveolar trabecular bone quality and mandibular canal corticalization. The aim of this study was to test this assumption histomorphometrically in...
Article
Dieser Artikel gibt einen Überblick über Klassifikation, Ätiologie und Risikofaktoren von gingivalen Rezessionen. Des Weiteren werden prä- und postoperatives Management der Patienten, Indikationsstellungen zur Rezessionsdeckung und Einflussfaktoren, die das Operationsergebnis beeinflussen, diskutiert. Der Schwerpunkt liegt auf der präoperativen Pha...
Article
Objectives The root morphology of the maxillary first premolar differs from the other premolars by presenting a high incidence of separated roots. This study addressed the spatial conditions during root development as a possible influencing factor. Therefore, maxillary computed tomographic (CT) scans of patients with regularly erupted or impacted p...
Article
To gain further insights and resolve conflicting results in the literature regarding prevalence, predominant location and morphologic variability of maxillary sinus septa. Electronic and hand searching of English literature identified 33 investigations published from 1995 to 2011. Septa were defined as at least 2-4 mm in height. Septa were present...
Article
Enamel matrix derivative (EMD) is widely used in promoting periodontal regeneration, but the mechanisms underlying its effects are not entirely clear. In particular, the effect of EMD on osseointegration of dental implants and its application in the treatment of peri-implantitis are still debatable. The purpose of this study was to investigate the...
Article
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Summary: The aims of this survey were to examine the levels and sources of information about dental implants and patients' needs for information. One thousand subjects representative of the Austrian population over 14 years of age were presented with questionnaire items in private households by face-to-face interviewing techniques. The results of t...
Article
To study the natural aetiopathology of jaw atrophy after tooth loss, unaltered by prosthetic procedures, an historical population without modern dental treatment was examined. Based on the hypothesis that there are predictable changes in shape during jaw-atrophy, frequency and degree of atrophy as well as clinical aspects of bone quality and resorp...
Article
Deer antler growth factor is extracted as a protein from deer antlers during the growth phase. This research examined the influence of deer antler growth factor on the viability, proliferation, and differentiation of human alveolar osteoblast cells in vitro. Human alveolar osteoblast cells were exposed to various concentrations of deer antler growt...
Article
Periodontitis is a local inflammatory disease that also has some systemic effects. We investigated the levels of interferon (IFN)-γ, tumor necrosis factor (TNF)-α, and interleukin (IL)-2, -4, -5, and -10 in the serum of patients with periodontitis in relation to the bacterial load in the dental plaques. Serum cytokine levels in patients with genera...
Article
Little is known about the level of information on implant dentistry in the public. A representative opinion poll on dental implants in the Austrian population was published in 2003 (Clinical Oral Implants Research 14:621-642). Seven years later, the poll was rerun to assess the up-to-date information level and evaluate recent progress and trends in...
Article
compared with widespread investigations on dental implant survival and biologic parameters, patient-based outcomes of implant dentistry have been neglected for years and are now becoming more popular. The aim of this representative opinion poll was to assess the up-to-date patients' mindset on dental implants and draw comparisons with the results p...
Article
Although Emdogain is widely used as a gel in periodontal therapy, the exact mechanisms underlying its regenerative ability still need to be further investigated. Therefore, we tested in vitro the effect of the product Emdogain on proliferation, viability, and migration of various human cell types of periodontium. Proliferation and viability of alve...
Article
The density and architecture of the alveolar trabecular bone are crucial to the stability of an endosseous implant. A significantly higher implant failure rate can be expected when implants are placed in alveolar bone with reduced density and stability. Therefore, the present study aimed to describe the trabecular bone structure of edentulous mandi...