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Journal of Orofacial Orthopedics =... Jan 2024Bacteria-induced white spot lesions are a common side effect of modern orthodontic treatment. Therefore, there is a need for novel orthodontic bracket materials with...
PURPOSE
Bacteria-induced white spot lesions are a common side effect of modern orthodontic treatment. Therefore, there is a need for novel orthodontic bracket materials with antibacterial properties that also resist long-term abrasion. The aim of this study was to investigate the abrasion-stable antibacterial properties of a newly developed, thoroughly silver-infiltrated material for orthodontic bracket application in an in situ experiment.
METHODS
To generate the novel material, silver was vacuum-infiltrated into a sintered porous tungsten matrix. A tooth brushing simulation machine was used to perform abrasion equal to 2 years of tooth brushing. The material was characterized by energy dispersive X‑ray (EDX) analysis and roughness measurement. To test for antibacterial properties in situ, individual occlusal splints equipped with specimens were worn intraorally by 12 periodontal healthy patients for 48 h. After fluorescence staining, the quantitative biofilm volume and live/dead distribution of the initial biofilm formation were analyzed by confocal laser scanning microscopy (CLSM).
RESULTS
Silver was infiltrated homogeneously throughout the tungsten matrix. Toothbrush abrasion only slightly reduced the material's thickness similar to conventional stainless steel bracket material and did not alter surface roughness. The new silver-modified material showed significantly reduced biofilm accumulation in situ. The effect was maintained even after abrasion.
CONCLUSION
A promising, novel silver-infiltrated abrasion-stable material for use as orthodontic brackets, which also exhibit strong antibacterial properties on in situ grown oral biofilms, was developed. The strong antibacterial properties were maintained even after surface abrasion simulated with long-term toothbrushing.
Topics: Humans; Silver; Orthodontic Brackets; Tungsten; Anti-Bacterial Agents; Biofilms; Stainless Steel; Surface Properties; Materials Testing
PubMed: 35849137
DOI: 10.1007/s00056-022-00405-7 -
Cranio : the Journal of... Mar 2024: To investigate the reasons for poor adaptation to mandibular advancement splint (MAS) treatment. The study consisted of 44 patients with obstructive sleep apnea who...
: To investigate the reasons for poor adaptation to mandibular advancement splint (MAS) treatment. The study consisted of 44 patients with obstructive sleep apnea who had unsuccessful MAS treatment. Data were collected on age, body mass index, gender, general and mental diseases, continuous positive airway pressure (CPAP) tryout, usage of occlusal splint, dental overjet, temporomandibular disorders, shortened dental arch, sleep apnea severity, and Apnea-Hypopnea Index. Sixty patients who underwent successful MAS treatment were controls. Patients with missing molars failed significantly more often in MAS therapy than the controls (). Patients with CPAP tryout prior to MAS treatment had a tendency to fail MAS treatment. MAS treatment was more likely to be successful in patients with prior occlusal splint experience (). The study could not identify a single reason for MAS failure.
Topics: Humans; Occlusal Splints; Mandibular Advancement; Sleep Apnea, Obstructive; Sleep Apnea Syndromes; Continuous Positive Airway Pressure; Treatment Outcome
PubMed: 33956581
DOI: 10.1080/08869634.2021.1922810