Objectives:
The purpose of the present study was to compare craniofacial morphology and bite force of bruxist patients with signs and symptoms of temporomandibular disorders.
Method:
Fourteen ...subjects with sleep bruxism and 14 healthy subjects participated. The signs and symptoms of the temporomandibular disorders were identified according to the Craniomandibular Index (CMI). Maximum bite force was measured using strain-gage transducers. Lateral cephalometric films were taken, and linear and angular measurements were performed.
Results:
Bite force between bruxist and non-bruxist females was not significant, whereas males with bruxism revealed higher bite forces. None of the linear and angular measurements differed significantly between bruxist and non-bruxist males. However, higher mandibular corpus length and anterior cranial base length, and lower gonial angle were observed in bruxist females compared to non-bruxist females. Negative correlation between bite force and CMI values was found in both genders.
Discussion:
Bruxist females had higher CMI values than bruxist males, which could lead to relatively lower bite forces.
The occlusal splint has been frequently used as an effective treatment in sleep bruxism patients. In the adjustment procedure of occlusal splint with an optimal occlusion, clinicians usually use ...conventional methods; however, they cannot measure the surface area of contacts, amount of force, and contacting time sequence. Recently, two separate technologies have been synchronized together: T-Scan III and BioEMG III. In the present case report, an occlusal splint in a patient with sleep bruxism was adjusted with synchronized T-Scan computerized digital occlusal analysis system and BioEMG III. Optimal occlusal parameters were generated, and quantitative analyses of occlusal scheme and muscle activity level were performed before and after the adjustment of the occlusal splint.
In the present case report, occlusion of the occlusal splint in a bruxism patient was adjusted with T-Scan III to fulfill the requirement of the optimal occlusion criteria. Before adjustment of occlusal splint, digital evaluation revealed unbalanced force distribution, lengthy occlusion (1.51 s), and disocclusion time (0.09 s) in centric relation. EMG activity of muscles was lower than expected values in centric relation. After adjustment of occlusal splint, canine protected occlusion with appropriate occlusion (0.2 s) and disocclusion (0.4 s) time were performed. Increased electromyography activity of the right anterior temporalis muscle showed a decrease in all excursive movements. Modern occlusal adjustment procedures provide a new standard of verification for the validation of occlusal splint fabrication with optimal occlusion.
AMAÇ: Bu çalışmada iki farklı yüzey yapısına göre hazırlanan yumuşak astar materyallerinde Candida albicans biyofilm oluşumunun değerlendirilmesi amaçlanmıştır.GEREÇ VE YÖNTEM: Dört yumuşak astar ...materyali (Molloplast B, Permafleks, Elite-Soft, Ufi Gel P) cam veya alçı yüzeyler üzerinde hazırlandı (5x5x2 mm; n=5). Tüm örneklerin yüzey pürüzlülükleri ve temas açıları ölçüldü. Candida albicans ATCC 10231 Sabouraud dextrose besiyeri (SDB) içerisinde 37 °C’de 24 saat süresince çoğaltıldı. Ardından, biyofilm oluşumu için örnekler polistren kuyucuklarda, önceden elde edilen Candida albicans kültürü ve taze SDB ilavesiyle 37 °C’de 48 saat süresince enkübe edildi. Örnekler %0.1 kristal viyole solüsyonu ile boyanarak 65 °C’de kurumaya bırakıldı. Biyofilm oluşumu spektrofotometrik yöntemle incelendi. Test edilen materyallerin yüzey pürüzlülüğü, temas açıları ve biyofilm formasyonlarının karşılaştırılması oneway ANOVA ve Tukey testi ile yapıldı. Cam veya alçı yüzeylerde hazırlanan örneklerin yüzey pürüzlülüğü, temas açıları ve biyofilm oluşumu arasındaki korelasyon Pearson korelasyon analizi ile incelendi.BULGULAR: Alçı yüzeyinde hazırlanan örneklerde yüzey pürüzlülüğü, temas açısı ve biyofilm oluşumu, cam üzerinde hazırlananlara göre istatistiksel olarak daha fazla bulundu (p<0.05). Alçı yüzeyde hazırlanan yumuşak astar materyallerinde biyofilm oluşumu, en fazla Ufi Gel P ve en az Molloplast B örneklerinde bulundu. Cam yüzeyde hazırlanan örneklerde ise en fazla biyofilm oluşumu Ufi Gel P’de bulundu. Candida albicans bağlanması ile hiç- bir yumuşak astar materyalinin yüzey özellikleri (yüzey pürüzlülüğü, temas açısı) arasında korelasyon bulunmadı (p>0.05). Alçı yüzeyde hazırlanan yumuşak astar materyallerinde biyofilm oluşumu, en fazla Ufi Gel P ve en az Molloplast B örneklerinde bulundu. Cam yüzeyde hazırlanan örneklerde ise en fazla biyofilm oluşumu Ufi Gel P’de bulundu. Candida albicans bağlanması ile hiçbir yumuşak astar materyalinin yüzey özellikleri (yüzey pürüzlülüğü, temas açısı) arasında korelasyon bulunmadı (p>0.05).SONUÇ: Test edilen yumuşak astar materyalleri, yüzey topografik özellikleri açısından benzer olsalar da farklı miktarlarda Candida albicans biyofilm oluşumu gösterdiler. Düz yüzeylerin biyofilm oluşumunu azalttığı gözlendi.
OBJECTIVE: The purpose of this study was to evaluate Candida albicans biofilm formation on soft liners prepared against two surfaces with different properties.MATERIALS AND METHOD: Four soft liners (Molloplast B, Permafleks, Elite-soft, Ufi Gel P) were prepared against glass or dental plaster surfaces (5x5x2 mm; n=5). The surface roughness and contact angle of the soft liner specimens were measured. Candida albicans ATCC 10231 was grown in Sabouraud dextrose broth (SDB) at 37 °C for 24 h. For biofilm formation, the specimens were incubated in polystrene wells together with fresh SDB and the C. albicans culture at 37 °C for 48 h. The specimens were stained with 0.1% crystal violet and dehydrated at 65 °C. The quantification of the C. albicans biofilm formation was performed spectrophotometrically. Comparison of the surface roughness, contact angle and biofilm formation between the materials was done using one way ANOVA and Tukey tests. Correlation between surface roughness, contact angle and biofilm formation on the specimens prepared against glass or plaster surfaces was performed using Pearson correlation analysis.RESULTS: Specimens prepared against plaster showed significantly higher surface roughness, contact angle and biofilm formation values in comparison to those prepared against glass surface (p<0.05). Among the specimens prepared against the dental plaster surface, the highest and the lowest biofilm formation values were observed in the Ufi Gel P and Molloplast B specimens, respectively. Among the specimens prepared against the glass surface, the greatest biofilm formation was shown for Ufi Gel P. There was no correlation between the surface properties (surface roughness and contact angle) and the amount of biofilm formation for the soft liner materials tested in this study (p>0.05).CONCLUSION: Although the soft liners tested in this study had similar surface topographic properties, they showed different amounts of C. albicans biofilm formation. Smooth surfaces were found to reduce the biofilm formation.
To evaluate the effect of anterior repositioning splint (ARS) on maximum bite force (MBF) values in patients with disc interference disorders (DID).
Twenty-two patients with disc interference ...disorders and 22 healthy subjects participated in to study. The Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) Axis I have been used to diagnose DID patients. All patients received ARS therapy for 6 weeks. The MBF measurement was performed with Flexi-Force piezo-resistive sensors for both healthy subjects and patients before and after ARS therapy.
A significant difference was recorded by the increase of the mean MBF values after the use of the ARS in the patient with disc derangements (
< .05).
APS therapy is efficient for eliminating pain and increasing MBF of the patients with DID. In addition, the use of FlexiForce sensors may be a practical solution to assess the bite force in the clinical setting.
Purpose
Silicone elastomers are generally used for maxillofacial extraoral prostheses. The purpose of this in vitro study was to evaluate the cytotoxicity of different kinds of nanoparticles added to ...two types of maxillofacial elastomers.
Materials and Methods
A‐2000 and A‐2006 silicone elastomers were used. The silicone specimens were divided into eight groups according to the presence of additional nanoparticles (n = 18). The following represents the groups in the study: Group A: A‐2000 silicone (control group); Group B: A‐2006 silicone (control group); Group C: A‐2000 silicone and the addition of titanium dioxide (TiO2); Group D: A‐2006 silicone and the addition of TiO2; Group E: A‐2000 silicone and the addition of fumed silica; Group F: A‐2006 silicone and the addition of fumed silica; Group G: A‐2000 silicone and the addition of silaned silica; Group H: A‐2006 silicone and the addition of silaned silica. A paired sample t‐test was used to analyze the cytotoxicity of each group after 24, 48, and 72 hours.
Results
Based on the results of the 24‐hour analysis, the biocompatibility values of the (A‐2006) fumed silica group were higher than those of the control groups. There was no statistically significant difference in A‐2006 and A‐2000 groups. The cytotoxicity values of the control groups and TiO2 (A‐2000 silicone) elastomer groups increased at all test times; however, the cytotoxicity values of the TiO2 (A‐2006), fumed silica (A‐2006), silaned silica (A‐2006), fumed silica (A‐2000), and silaned silica (A‐2000) groups increased significantly only from 24 to 48 hours.
Conclusion
Nanoparticles of TiO2, fumed silica, and silaned silica added to a commercial silicone‐based elastomer used for fabrication of maxillofacial prostheses are nontoxic.
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