The effect of the crimping of the piston to the long process of the incus on sound transmission in the middle ear of the temporal bone model
- VernacularTitle:镫骨赝附体与砧骨长脚之间连接状态对声音传导的影响
- Author:
Furong MA
;
Huber ALEX
;
Linder THOMAS
;
Felix HEIDI
;
Pollak ANITA
- Publication Type:Journal Article
- Keywords:
Stapes;
Prostheses and Implants;
Temporal Bone
- From:
Chinese Archives of Otolaryngology-Head and Neck Surgery
2006;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE The objective of this study was to evaluate the effect of crimping of thepiston to the long process of the incus on sound transmission in the middle ear of the temporal bone model, and to use this information to guide stapes surgery and ossicular reconstruction. METHODS Seventeen temporal bone models was analyzed under different electromechanical stimulations. Scanning laser Doppler interferometry was used to measure the differences in sound conductivity due to the piston and the long process of the incus being crimped to a different degree. RESULTS The degree of crimping of the piston to long process of the incus was defined as either tight,loose or none. The classification was done by three physicians using endoscopic and scanning electron microscopic images. There was no significant disagreement among the doctors. Under 500 mV,800 mV,and 1200 mV of electromechanical stimulations,the degree of sound conductivity between the long process of the incus and piston was determined by scanning laser Doppler interferometry. A computer algorithm was developed in order to simulate acoustic stimulation by electromechanical stimulation. It has been found that the sound transmission loss was 2 dB,which was similar to the sound transmission loss of 3 dB within the incudostapedial joint. But the degree of crimping resulted in variabilities in this number. While the greatest loss was 28 dB,the average loss was 10 dB. CONCLUSION The optimal crimping between the long process of the incus and piston is tight,as it results in less sound transmission loss compared to the physiologic transmission loss within the incudostapedial joint.
