Improvement of osseointegration of Ti–6Al–4V ELI alloy orthodontic mini-screws through anodization, cyclic pre-calcification, and heat treatments

paythelady.61 shared this article with you from Inoreader Improvement of osseointegration of Ti–6Al–4V ELI alloy orthodontic mini-screws through anodization, cyclic pre-calcification, and heat treatments Via Progress in Orthodontics - Latest Articles Mini-screws are widely used as temporary anchorages in orthodontic treatment, but have the disadvantage of showing a high failure rate of about 10%. Therefore, orthodontic mini-screws should have high biocompa... View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Sociomedical and oral factors affecting masticatory performance in an older population

paythelady.61 shared this article with you from Inoreader Sociomedical and oral factors affecting masticatory performance in an older population Via Latest Results for Clinical Oral Investigations Abstract Objectives To assess the sociomedical and oral factors affecting masticatory performance in a community-dwelling older population. Materials and methods Community-dwelling persons over 60 years were investigated using medical and dental oral interviews, oral and denture examination (natural teeth, tooth mobility, number of occluding tooth pairs, and removable dentures' prevalence and quality), and evaluation of masticatory performance using a mixing ability test. Results A total of 130 participants with a mean age of 73.9±8.5 years were recorded. Fifty-eight (44.6%) used various types of removable prostheses. Twenty were edentulous and used a pair of complete dentures. Univariate analyses revealed statistically significant associations (p≤0.05) between masticatory performance and aging, marital status, subjective chewing ability, use of removable dentures, use of various combinations of complete dentures, pain caused by maxillary denture, number of teeth, tooth mobility, posterior chewing pairs, all chewing contacts natural or prosthetic, retention of mandibular partial dentures, and dentures' occlusion. The multivariable quantile regression analysis revealed that fewer natural teeth (95% CI: −0.02–0.01, p<0.001), being edentulous and using a pair of complete dentures (95% CI: 0.09–0.35, p=0.001), and larger percentage of severely mobile teeth (95% CI: 0.07–0.82, p=0.020) we re associated with lower masticatory performance. Conclusions Poor masticatory performance in older adults was associated with fewer teeth, being edentulous and using a pair of complete dentures, and increased prevalence of severe tooth mobility. Clinical relevance Retaining the natural dentition and preventing and treating periodontal disease are important measures to maintain masticatory performance in older adults. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Sclerostin in Periodontal Ligament: Homeostatic Regulator in Biophysical Force‐Induced Tooth Movement

paythelady.61 shared this article with you from Inoreader Sclerostin in Periodontal Ligament: Homeostatic Regulator in Biophysical Force‐Induced Tooth Movement Via Journal of Clinical Periodontology Abstract Aim This study elucidates the role of sclerostin in periodontal ligament (PDL) as a homeostatic regulator in biophysical force-induced tooth movement (BFTM). Materials and Methods BFTM was performed in rats, followed by microarray, immunofluorescence, in situ hybridization, and real-time PCR for detection and identification of the molecules. The periodontal space was analyzed via micro-computed tomography. Effects on osteoclastogenesis and bone resorption were evaluated in mouse bone marrow-derived cells. In vitro human PDL cells were subjected to biophysical forces. Results In the absence of BFTM, sclerostin was hardly detected in the periodontium except the PDL and alveolar bone in the furcation region and apex of the molar roots. However, sclerostin was upregulated in the PDL in vivo by adaptable force, which induced typical transfiguration without changes in periodontal space as well as in vitro PDL cells under compression and tension. In contrast, the sclerostin level was unaffected by heavy force, which caused severe degeneration of the PDL and narrowed periodontal space. Sclerostin inhibited osteoclastogenesis and bone resorption, which corroborates the accelerated tooth movement by the heavy force. Conclusions Sclerostin in PDL may be a key homeostatic molecule in the periodontium and a biological target for the therapeutic modulation of BFTM. This article is protected by copyright. All rights reserved. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Does social support predict increased use of dental services in older men?

paythelady.61 shared this article with you from Inoreader Does social support predict increased use of dental services in older men? Via Australian Dental Journal Abstract Background Past research on social support and dental visits in older people has been limited by cross-sectional design, limited social support dimensions, and non-representative samples. Methods Data came from men with natural teeth completing Waves 3 and 4 of the Concord Health and Ageing in Men Project (CHAMP) in Sydney, Australia. The relationship between social support at Wave 3 (2011-2012) and at least one dental visit per year at Wave 4 (2014-2016) was examined by Poisson regression. Social support was measured by structural (marital status, living arrangements, family support, social interaction) and functional (social support satisfaction) domains. Results There were 673 men analysed. Structural and functional social support were not associated with the pattern of usual dental visits five years later in univariable or multivariable analyses. The only consistent significant factor was income source, with older men who had other sources of income more likely to regularly visit the dentist than older men solely reliant on the pension for income (PR: 1.31, 95% CI: 1.13 – 1.52). Conclusions We found no differences in the pattern of usual dental visits between older men with different levels and types of social support. For older Australian men, income source seems to be the most important determinant of regular dental visits. © 2022 Australian Dental Association View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Use of transoral carbon dioxide laser for supraglottic web from caustic ingestion in a 13 year old

paythelady.61 shared this article with you from Inoreader Use of transoral carbon dioxide laser for supraglottic web from caustic ingestion in a 13 year old Via Auris Nasus Larynx A 13 year old male was referred to the Department of Otorhinolaryngology due to unsuccessful decannulation. At 2 years of age, patient accidentally ingested a caustic liquid alkali and underwent emergency tracheostomy, exploratory laparotomy, and tube gastrectomy. 11 years after, patient was seen at the outpatient department for decannulation. On nasopharyngolaryngoscopy, a supraglottic stenosis with a central 1-mm opening was visualized. Patient underwent transoral carbon dioxide laser excision of supraglottic stenosis. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Differential Activation of Canal and Otolith Afferents by Acoustic Tone Bursts in Rats

paythelady.61 shared this article with you from Inoreader Differential Activation of Canal and Otolith Afferents by Acoustic Tone Bursts in Rats Via Latest Results for Journal of the Association for Research in Otolaryngology Abstract Vestibular evoked myogenic potentials (VEMPs) are routinely used to test otolith function, but which specific vestibular afferent neurons and central circuits are activated by auditory frequency VEMP stimuli remains unclear. To examine this question, we analyzed the sensitivity of individual vestibular afferents in adult Sprague–Dawley rats to tone bursts delivered at 9 frequencies (125–4000 Hz) and 3 intensity levels (60, 70, 80 dB SL re: acoustic brainstem response (ABR) threshold). Afferent neuron tone sensitivity was quantified by the cumulative probability of evoking a spike (CPE). Based on a threshold CPE of 0.1, acoustic stimuli in the present study evoked responses in 78.2 % (390/499) of otolith afferent neurons vs. 48.4 % (431/891) of canal afferent neurons. Organ-specific vestibular inputs to the central nervous system in response to tone bursts differ based on intensity and frequency content of the stimulus. At frequencies below 500  Hz, tone bursts primarily activated both otolith afferents, even at the highest intensity tested (80 dB SL re ABR threshold). At 1500 Hz, however, tone bursts activated the canal and otolith afferents at the moderate and high intensities tested (70, 80 dB SL), but activated only otolith afferents at the low intensity tested (60 dB SL). Within an end organ, diversity of sensitivity between individual afferent neurons correlated with spontaneous discharge rate and regularity. Examination of inner ear fluid mechanics in silico suggests that the frequency response and preferential activation of the otolith organs likely arise from inner ear fluid motion trapped near the oval and round windows. These results provide insight into understanding the mechanisms of sound activation of the vestibular system and developing novel discriminative VEMP testing protocols and interpretative guidelines in humans. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Effect of Selective Carboplatin-Induced Inner Hair Cell Loss on Temporal Integration in Chinchillas

paythelady.61 shared this article with you from Inoreader Effect of Selective Carboplatin-Induced Inner Hair Cell Loss on Temporal Integration in Chinchillas Via Latest Results for Journal of the Association for Research in Otolaryngology Abstract Integration of acoustic information over time is essential for processing complex stimuli, such as speech, due to its continuous variability along the time domain. In both humans and animals, perception of acoustic stimuli is a function of both stimulus intensity and duration. For brief acoustic stimuli, as duration increases, thresholds decrease by approximately 3 dB for every doubling in duration until stimulus duration reaches 500 ms, a phenomenon known as temporal integration. Although hearing loss and damage to outer hair cells (OHC) have been shown to alter temporal integration in some studies, the role of cochlear inner hair cells (IHC) on temporal integration is unknown. Because IHC transmit nearly all acoustic information to the central auditory system and are believed to code both intensity and timing information, these sensory cells likely play a critical role in temporal integration. To test the hypothesis that selective IHC loss degrades th e temporal integration function, behaviorally trained chinchillas were treated with carboplatin, a drug known to selectively destroy IHC with little to no effect on OHC in this species. Pure-tone thresholds were assessed across frequencies (1, 2, 4, 8, 12 kHz) as a function of signal duration (500, 100, 50, 10, and 5 ms). Baseline testing showed a significant effect of duration on thresholds. Threshold decreased as a function of increasing duration, as expected. Carboplatin treatment (75 mg/kg) produced a moderate to severe loss of IHC (45–85%) with little-to-no loss of OHC. Contrary to our hypothesis, post-carboplatin temporal integration thresholds showed no significant differences from baseline regardless of stimulus duration or frequency. These data suggest that few IHC are necessary for temporal integration of simple stimuli. Temporal integration may be sensitive to loss of OHC and loss of cochlear non-linearities but does not appear to be sensitive to selectiv e IHC loss. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Modification of an extended total temporomandibular joint replacement (eTMJR) classification system

paythelady.61 shared this article with you from Inoreader Modification of an extended total temporomandibular joint replacement (eTMJR) classification system Via British Journal of Oral and Maxillofacial Surgery The aims of this paper were to validate a modification of an extended total temporomandibular joint replacement (eTMJR) classification system and develop a classification schematic for ease of reference. High volume TMJ surgeons were asked to score 20 separate eTMJR devices using the updated classification system and inter-rater variability was calculated. Using the modified classification system developed, a Conger's kappa (k) coefficient of 0.53 was returned, suggesting moderate to good levels of agreement. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.