OBJECTIVE: To provide a clinical reference by comparing the conventional 226 Hz tympanometry with 1000 Hz tympanometry in two groups of young children with otitis media effusion evidenced by CT scan. METHOD: One hundred and seventy-seven young children (226 ears), from 1 to 60 months, with otitis media effusion were involved in this study. They were divided into six groups by age: 0-6 months group, 6-12 months group, 12-18 months group, 18-24 months group, 24-36 months group, 36-60 months group. They were tested with tympanometry of 2 probe-tones of 226 and 1 000 Hz. Type A tympanogram was defined as a normal middle ear function in 226 Hz and single-or double-peak in 1 000 Hz tympanometry. One hundred and fifty-eight normal young children (266 ears) were selected as control group. The results were analysed with Chi square test. Receiver operator characteristic (ROC) analysis was performed to evaluate the two methods. RESULT: In the young children with otitis media effusion, the detection rate of 226 Hz tympanogram in six groups was 21.1%, 35.2%, 46.9%, 42%, 62.5% and 68% respectively, while 94.7%, 98.1%, 96.9%, 91.2%, 95.8% and 88% respectively in 1 000 Hz tympanogram. In the young children with normal middle ear function, the detection rate of 226 Hz tympanogram in six groups was 95.1%, 88.6%, 85.1%, 93.3%, 88.5% and 93.5%, while 87.8%, 94.3%, 89.4%, 95.6%, 94.2% and 97.8% respectively in 1 000 Hz tympanogram. The detection rate was significantly different between 226 and 1 000 Hz tympanogram in the young children under 36-month old. CONCLUSION A single-or double-peak 1000 Hz tympanometric patterns as normal criteria was a simple way to evaluate young children s' middle ear function. 1 000 Hz tympanometry should be given priority to the children within 36-month old in detection middle ear function,the 226 and 1 000 Hz tympanometry should be done at the same time within 36-60 months old.
Acoustic Impedance Tests ; methods ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Male ; Otitis Media with Effusion ; diagnosis ; Sensitivity and Specificity

OBJECTIVE: The aim of this study is to evaluate the development of auditory performance and speech intelligibility within the first year after hearing aid fitting in children with moderate or severe hearing loss, investigate the effects of hearing level on auditory performance and speech intelligibility and provide a clinical database for their hearing and speech habilitation. METHOD: Twenty-nine children participated in this study, ranging in age at hearing aid fitting from 3 to 8 years old with a mean of 5. 6 years old. 19 were boys and 10 were girls. According to their hearing level, they were divided into two groups. 14 children were in group of moderate hearing loss (41-60 dB HL). 15 children were in group of severe hearing loss (61-80 dB HL). The categories of auditory performance (CAP) and speech intelligibility rating (SIR) were used to evaluate their auditory performance and speech intelligibility. The evaluation was performed before hearing aid fitting and 1, 3, 6, 9, 12 months after fitting. RESULT: There was significant difference in mean score of CAP between group of moderate hearing loss and severe hearing loss before hearing aid fitting (P < 0.05). However, no significant differences were observed between these two groups at 1, 3, 6, 9, 12 months after fitting (P > 0.05). There was also significant difference in mean score of SIR between group of moderate hearing loss and severe hearing loss before hearing aid fitting (P < 0.05). How ever, no significant differences were also observed between these two groups at 1, 3, 6, 9, 12 months after fitting (P > 0.05). The mean scores of CAP for group of moderate hearing loss at 6, 9, 12 months after fitting were significantly superior in comparison with the score before hearing aid fitting (P < 0.05). The mean scores of SIR for group of moderate hearing loss at 6, 9, 12 months after fitting were significantly superior in comparison with the score before hearing aid fitting (P < 0.05); the mean score at 12 months after fitting was also significantly superior in comparison with the score at 1 month after fitting (P < 0.05). The mean scores of CAP for group of severe hearing loss at 3, 6, 9, 12 months after fitting were significantly superior in comparison with the score before hearing aid fitting (P < 0.05); the mean scores at 9,12 months after fitting were significantly superior in comparison with the score at 1 month after fitting (P < 0.05). The mean scores of SIR for group of severe hearing loss at 3, 6, 9, 12 months after fitting were significantly superior in comparison with the score before hearing aid fitting (P < 0.05); the mean scores at 6, 9, 12 months after fitting were also significantly superior in comparison with the score at 1 month after fitting (P < 0.05). CONCLUSION Auditory performance and speech intelligibility in children with moderate or severe hearing loss improved significantly within the first year after hearing aid fitting. The development followed different trajectory.
Child ; Child, Preschool ; Deafness ; psychology ; rehabilitation ; Female ; Hearing Aids ; Hearing Tests ; Humans ; Male ; Speech Perception

OBJECTIVETo investigate characteristics of the border mandibular movement of the adolescent with Angle III malocclusion and to find the correlations between craniofacial morphology and border mandibular movement function.

METHODSThe subjects consisted of 21 adolescent patients with Angle III malocclusion in the initial stage of permanent dentition (mean age 12.3 years). 20 adolescents with individual normal occlusion served as control (mean age 12.8 years). The border mandibular movement of all cases in the two groups were traced and recorded by K6-1 Evaluation System and standardized lateral cephalograms were taken.

RESULTSThe results revealed no significant difference in the maximal movement range between two groups, but indicated a positive association between the maximum jaw opening and both the mandible length (Go-Gn) and the L1-MP. The distance from ICP to maximal opening (D) was positively correlated with facial height and the L1-MP. While to adolescents with individual normal occlusion, the wider the maximal jaw opening was, the bigger the posterior facial height and the cephalometric values of mandibular ramus. The distance D positively correlated with the anterior lower facial height.

CONCLUSIONAngle III malocclusion had its characteristics in the tracing and had a specific relationship with the craniofacial morphology.

Adolescent ; Cephalometry ; Dental Occlusion ; Dentition, Permanent ; Face ; Humans ; Malocclusion ; Mandible ; Movement