In Anlehnung an DIN 13990-2 wurden nach Einwirkung physikalischen Stresses in Form von Temperatur und Feuchtigkeit die Scherhaftfestigkeit der Titanzylinder an humanen Felsenbeinknochen gemessen. Stryker) und der Glasionomerzement Ketac™ Cem (Fa. Es wurden der Calciumphosphatzement HydroSet® (Fa. Ziel der Dissertation war die Findung einer geeigneten Haftkomponente zur Fixation des Kamins am runden Fenster. Es bedarf eines Haftvermittlers, der eine suffiziente Verbindung zwischen dem Titankamin und dem darunter befindlichen Knochen am runden Fenster herstellt. Die suffiziente Fixation des Kamins an der Rundfensternische stellt eine Herausforderung dar. Erste Ergebnisse der kontrollierten Ankopplung am runden Fenster mit einem Kamin zeigten vielversprechende Ergebnisse.
Bei der Implantation des Floating mass transducers (FMT) am runden Fenster zeigte sich in der Klinik neben einer hohen Revisionsrate von bis zu 15,6 % eine hohe Varianz der audiologischen Ergebnisse, was auf eine unkontrollierte und mangelnde Ankopplung des Floating mass transducers an das runde Fenster zurückzuführen ist. Die Vibrant sound bridge stellt eine Alternative für Patienten dar, bei denen aus verschiedenen Gründen eine Unverträglichkeit gegenüber herkömmlichen Hörgeräten besteht. Sie können zur Rehabilitation von Schallleitungs- und Schallempfindungsstörungen, sowie kombinierter Hörstörungen indiziert sein. Seit Mitte der 90er-Jahre gewinnen aktive Mittelohrimplantate wie die Vibrant sound bridge (VSB) zunehmend an Bedeutung. Therefore, we conclude that direct contact of BC with nerve should be avoided, and the area should be cleaned by aspiration or washing with physiological saline in case of contact. This study Results suggest that BC has no direct toxicity on facial nerve, while it has indirect effects, by decreasing amplitude. In addition, degeneration in axon, myelin, or perineural nets was not detected in any of the groups. In none of the groups, foreign body reaction and granulation tissue were not detected in any of the groups. We found no statistically significant difference in inflammation among the groups. For histopathological assessments, the rats were euthanized and tissue samples of facial nerve and surrounding areas were collected.Īccording to the wave amplitude levels of evoked EMG, postoperative amplitude levels of group D were significantly decreased, compared to preoperative amplitude levels (P=0.043). Pre- and postoperative (on 4th week) evoked electromyography (EMG) measurements were done. In the group D, BC solution was dropped onto the facial nerve trunks of rats and after allowing 5 minutes to dry, wounds were closed.
In the group C, BC solution was dropped onto the facial nerve trunks of rats and washed with physiological saline after 5 seconds. Group A was designed as the control group, while group B was sham group. This study included 20 male albino Wistar rats, divided into four equal groups. To investigate neurotoxic effect of bone cement (BC) on facial nerve by using electrophysiological and histopathological methods. Further clinical investigations are needed to test different parameters. The results obtained in this study by investigating the bone-bonding strength of cements widely used in ossiculoplasty demonstrate that some of these substances have a greater ability to bond to ossicles compared to others. Both AM and KC had higher SBS than OH (p<0.05). AC had the highest SBS, which was statistically significantly different from that of KC and OH (p<0.05). The mean SBSs were found to be 13.28 MPa, 23.43 MPa, 8.51MPa, and 1.78 MPa for AM, AC, KC, and OH, respectively. The SBS was tested using a universal testing machine at a crosshead speed of 0.5 mm/min. The tested materials were prepared and applied according to the manufacturer's instructions. All specimens were inserted into a specially designed apparatus for shear bond strength (SBS) testing. All specimens were randomly divided into four subgroups. Twenty ossicles were obtained from patients who had undergone ear surgery. The aim of this study was to investigate the bond strength of different GIC on ossicles.
The bonding strength of the substance may be of importance for long-term outcomes. The bond strength of GIC used in ossiculoplasty and the way they may change over the years in the cementation area are being questioned. In recent years, GIC have also been used for ossiculoplasty. BACKGROUND:Glass ionomer cements (GIC) have been widely used in dentistry for many years.