The Hannover Medical School library

The Hannover Medical School library was initially the only source to provide literature and information for the whole of the Medical School. Literature in every form is now made available by the central location of purchase based in the library. The traditional library is the main area to provide information and learning facilities for all students and employees. The extension of electronic facilities together with a broad spectrum of services offered by the library personnel constitutes the main functions of the library.Die Bibliothek der Medizinischen Hochschule Hannover wurde von Beginn an als das einzige wissenschaftliche Literatur- und Informationszentrum der gesamten Hochschule konzipiert. Als zentrale Einkaufsstelle beschafft sie den gesamten Literaturbestand der Hochschule. Als Freihandbibliothek bietet sie den Studenten und Beschäftigten einen zentralen Informations- und Lernort. Der Ausbau der elektronischen Angebote und ein umfangreiches Servicespektrum gehören zu den zentralen Aufgaben der Bibliothek

Evaluation of symmetry behavior of surgically assisted rapid maxillary expansion with simulation-driven targeted bone weakening

Objectives!#!Surgically assisted rapid maxillary expansion (SARME) is a treatment modality to overcome maxillary constrictions. During the procedure of transverse expansion, unwanted asymmetries can occur. This retrospective study investigates the transverse expansion behavior of the maxilla utilizing a simulation-driven SARME with targeted bone weakening.!##!Materials and methods!#!Cone beam computer tomographies of 21 patients before (T1) and 4 months after treatment (T2) with simulation-driven SARME combined with a transpalatal distractor (TPD) and targeted bone weakening were superimposed. The movements of the left, right, and frontal segments were evaluated at the modified WALA ridge, mid root level, and at the root tip of all upper teeth. Linear and angular measurements were performed to detect dentoalveolar changes.!##!Results!#!Dentoalveolar changes were unavoidable, and buccal tipping of the premolars (6.1° ± 5.0°) was significant (p < 0.05). Transverse expansion in premolar region was higher (6.13 ± 4.63mm) than that in the molar region (4.20 ± 4.64mm). Expansion of left and right segments did not differ significantly (p > 0.05).!##!Conclusion!#!Simulation-driven SARME with targeted bone weakening is effective to achieve symmetrical expansion in the transverse plane.!##!Clinical relevance!#!Simulation-driven targeted bone weakening is a novel method for SARME to achieve symmetric expansion. Dental side effects cannot be prohibited

Assessment

In order to achieve an adequate oral rehabilitation after reconstruction of the jaw, a consistent prosthetic treatment is necessary. The main determinants of implant stability are the mechanical properties of the bone tissue at the implant site, and how the contact between the implant neck and the cortical bone plate is achieved. If we presume a correct surgical technique and a good implant design, the bone density determines the primary implant stability at the time of surgery. A stable implant can exhibit different degrees of displacement or resistance to load, which corresponds to varying degrees of stability. Conversely, a failed implant shows clinical mobility on the macroscale, as the implant is surrounded by a fibrous scar tissue. An increasing degree of micro-mobility is present until clinical failure of the implant. This suggests that techniques to measure and to monitor implant micro-motion/stability could give the clinician the opportunity to optimize implant treatment. Insertion torque, Periotest, and resonance frequency analysis are suitable to measure primary implant stability. Nevertheless, the resonance frequency analysis is the only method that can detect variations in different bone densities, which may be measured even during the follow-up of the implant