Christof Holberg

Christof Holberg
Ludwig-Maximilians-University of Munich | LMU · Faculty of Medicine

Prof. Dr. med. Dr. med. dent.

About

42
Publications
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Publications

Publications (42)
Article
Full-text available
Background/Aim An increasing number of elderly patients with implant‐prosthodontic rehabilitation of the edentulous mandible frequently show increased life activity and consequently a greater number of aged patients is at risk for maxillofacial trauma. The aim of this 3‐dimensional (3D) finite element analysis (FEA) was to evaluate the biomechanica...
Article
Zusammenfassung Ziel dieser retrospektiven Studie war es, Veränderungen der Zahnbogendimension bei Patienten im Wechselgebiss mit Klasse-II-Malokklusion nach Gaumennahterweiterung, anschließender Multiband-Multibracket-Therapie und Retention darzustellen und mit einer nicht behandelten Kontrollgruppe zu vergleichen.
Article
Objectives: The goal of this work was to biomechanically analyze several different methods of bracket debonding and compare the strain they induce in the periodontal ligament (PDL). Methods: The CT dataset of an anatomical specimen was divided into four segmental models of the mandible. Each model covered one tooth (32, 42, 44, and 47). One of t...
Article
While there are many studies in the literature addressing direct miniscrew anchorage, the biomechanical effects of indirect miniscrew anchorage remain unknown. The aim of the present study was to biomechanically analyze the load on the anchor teeth during mandibular molar protraction using different types of anchorage. Four finite element method (F...
Article
In the present study, lithium-disilicate ceramic inlays should be analyzed biomechanically according to their thickness and dimension, and it should be clarified as to whether there is a significant relationship between the inlay volume and the induced tensile stress level. Using a new parametric CAD modeling procedure, 27 lithium-disilicate cerami...
Article
OBJECTIVES: It is still unclear whether the inlay thickness is an important factor influencing the fracture risk of ceramic inlays. As high tensile stresses increase the fracture risk of ceramic inlays, the objective of the present finite element method (FEM) study was to biomechanically analyze the correlation between inlay thickness (T) and the i...
Article
Full-text available
Objectives Loosening and loss rates of monocortical mini-implants are relatively high, therefore the following null hypothesis was tested: 'The local bone stress in mono and bicortically-anchored mini-implants is identical'.Material and Methods Anisotropic Finite Element Method (FEM) models of the mandibular bone, including teeth, periodontal ligam...
Article
OBJECTIVES: Until now, it is not clear if various procedures of bracket debonding differ with regard to their risk of enamel fracture. Therefore, the objective of the present study was to compare these procedures biomechanically for assessing the risk of complications. MATERIALS AND METHODS: An anisotropic finite element method (FEM) model of the m...
Article
Objective: The mesialization of molars in the lower jaw represents a particularly demanding scenario for the quality of orthodontic anchorage. The use of miniscrew implants has proven particularly effective; whereby, these orthodontic implants are either directly loaded (direct anchorage) or employed indirectly to stabilize a dental anchorage bloc...
Article
To evaluate the clinical application of three-dimensional (3D) imaging for the analysis of a broad variety of cleft lips and to conduct a systematic analysis. This was a prospective study using a noncontact 3D laser scanner to acquire the preoperative 3D facial profiles. The data sets were analyzed qualitatively and quantitatively. The data were ex...
Article
The aim of this study was to evaluate the clinical application of three-dimensional (3D) imaging and morphological analysis with subsequent individual therapy planning and postoperative 3D symmetry control in comparison with data from non-cleft persons. This was a prospective study using a 3D surface-imaging and evaluation system in cleft patients...
Article
The goal of this study was to analyze the strains induced in the sutures of the midface and the cranial base by headgear therapy involving orthopedic forces. Does the mechanical signal induced in the sutures sufficiently account for a growth-influencing effect? A finite element model of the viscerocranium and the neurocranium was used. It consisted...
Article
In 3D mapping of flexible surfaces (e.g. human faces) measurement errors due to movement or positioning occur. Aggravated by equipment- or researcher-caused mistakes considerable deviations can result. Therefore first the appliances' precision handling and reliability in clinical environment must be established. Aim of this study was to investigate...
Article
Our aim in this study was to investigate the stresses in the midface and at the cranial base during surgically assisted rapid maxillary expansion, to determine whether surgically assisted separation of the maxilla from the cranial base can be considered justified and necessary. By using finite element models, surgically assisted rapid maxillary exp...
Article
The goal of the study was to examine the strain in the sutures of the midface and the cranial base with maxillary protraction therapy and to clarify whether such stretching suggests a skeletal effect of the apparatus employed for that purpose. Using a finite elements model, a maxillary protraction therapy was simulated with various force levels and...
Article
To carry out a comparative biomechanical analysis of maxillary low force expansion using the quadhelix appliance in cleft and noncleft patients. We also intended to determine whether a sufficient transverse skeletal effect could be achieved among cleft patients using the quadhelix appliance. Three finite element models of the viscerocranium and neu...
Article
Full-text available
The objective of this study on surgically assisted rapid maxillary expansion (RME) was to examine the extent of stress reduction in the midface and the cranial base with various surgical procedures. Four finite element models of the skull were generated (one without and three with different surgical incisions), in which a virtual RME (5 mm gap widt...
Article
In most cases it is not sufficient to use photographs and plaster casts to document and analyze the three-dimensional morphology of lip, jaw, and palate clefts. The aim of this study was to evaluate the applicability of surface scanning with a 3-D laser topography scanner in patients with unilateral cleft lip. Three-dimensional surface scans of the...
Article
Hintergrund Mit Gipsmodellen und Fotografien ist die dreidimensionale Analyse einer Lippen-Kiefer-Gaumen-Spalte meist nur unzureichend möglich. Ziel der vorliegenden Studie war es daher, die 3-D-Lasertopometrie auf ihre Anwendbarkeit zur dreidimensionalen Weichgewebserfassung bei Patienten mit Lippen-Kiefer-Gaumen-Spalten zu testen. Patienten und...
Article
Since many simulation and animation procedures for mimicry are based on averaged values and do not take into account an individual's situation, the goal of this study was to investigate the intra- and inter-individual variability of conscious smiling. Twenty-three surface points were marked on the faces of 31 adult test individuals. Six photographs...
Article
An analysis of the distribution of stresses at the juvenile and adult cranial base after implementation of a rapid palatal suture expansion was the goal of this study. Of particular interest were stresses occurring near the cranial foramina containing vulnerable structures. The stresses were simulated and analyzed using a finite elements model of t...
Article
The aim of this study was to evaluate the accuracy of facial plaster casts and their suitability for 3-D mapping. All measurements were carried out on 15 adult probands (seven female and eight male; age range 19-31 years, mean 24.7 years). A plaster cast of the facial surface was prepared for all probands using alginate impressions. The plaster cas...
Article
Objective: The aim of this study was to evaluate the accuracy of facial plaster casts and their suitability for 3-D mapping. Materials and Methods: All measurements were carried out on 15 adult probands (seven female and eight male; age range 19-31 years, mean 24.7 years). A plaster cast of the facial surface was prepared for all probands using alg...
Article
Mit Gipsmodellen und Fotografien ist die dreidimensionale Analyse einer Lippen-Kiefer-Gaumen-Spalte meist nur unzureichend möglich. Ziel der vorliegenden Studie war es daher, die 3-D-Lasertopometrie auf ihre Anwendbarkeit zur dreidimensionalen Weichgewebserfassung bei Patienten mit Lippen-Kiefer-Gaumen-Spalten zu testen.Bei 20Patienten (3–35Jahre),...
Article
In order to obtain an overlay-free assessment of dental structures for resorption and ankylosis diagnostics, conebeam computed tomography (CBCT) is being employed more and more often in orthodontics alongside dental CT. The aim of this study was to investigate the quality and accuracy of CBCT in the imaging of dental structures and to compare it wi...
Article
The prediction of soft tissue esthetics is important for achieving an optimal esthetic outcome in orthodontic treatment planning. Applicable procedures have so far been restricted to two-dimensional profile predictions that have not proven to be very reliable. The goal of this investigation was therefore to develop a novel finite element-based proc...
Article
The goal of this study was to analyze the validity and prediction accuracy of a newly-developed procedure for three-dimensional soft tissue prediction based on Finite Element Method, and to compare the results with prediction produced using an existing two-dimensional prediction program (Dentofacial Planner Plus). In twelve patients who underwent c...
Article
Rapid maxillary expansion not only has local effects on the midpalatal suture and the maxillary region, but also on deep anatomical structures of the viscero- and neurocranium. This study's aim was to analyze the distribution pattern of stresses on the juvenile and adult sphenoid by the finite element method (FEM) induced by rapid maxillary expansi...
Article
SUBJECT MATTER: In cases of bilateral cleft lip, alveolus and palate, preoperative positioning of the premaxilla using Latham's appliance has been described. This method is controversial, since it may cause growth defects. From 1992 to 2000, Latham's appliance was inserted preoperatively into 20 patients with bilateral lip, alveolus and palate clef...
Article
Fragestellung. Die Oberkieferelemente bei doppelseitigen Lippen-Kiefer-Gaumen-Spalten sind einer präoperativen orthopädischen Behandlung durch Anwendung einer Latham-Apparatur zugänglich. Dieses Verfahren wird kontrovers diskutiert, da ihm Wachstumsdefizite zugeschrieben werden. Patienten und Methode. Von 1992–2000 wurden bei 20 Patienten mit dopp...
Article
Three-dimensional registration of the facial surface by methods which are currently in use is difficult because of the long measuring times required by point-based imaging systems. Artifacts caused by movement appear, e.g., blinking. Also the production of a facial plaster-cast model for measuring is not an adequate solution. In order to acquire da...
Article
Three-dimensional registration of the facial surface by methods which are currently in use is difficult because of the long measuring times required by point-based imaging systems. Artifacts caused by movement appear, e.g., blinking. Also the production of a facial plaster-cast model for measuring is not an adequate solution. In order to acquire da...
Article
Three-dimensional registration of the facial surface by methods which are currently in use is difficult because of the long measuring times required by point-based imaging systems. Artifacts caused by movement appear, e.g., blinking. Also the production of a facial plaster-cast model for measuring is not an adequate solution. In order to acquire da...

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