Use of an individual mandibular advancement device for an obstructive sleep apnoea patient with facial paralysis: a short-term follow-up case report

This case report aimed to describe the fabrication procedure and treatment efficacy of an individual, one-piece, non-adjustable mandibular advancement device (MAD) for a moderate obstructive sleep apnoea patient with facial paralysis (FP). Mandibular advancement device was fabricated with autopolymerising acrylic resin. The intermaxillary relations were recorded such as to fix the mandible at a protruded position with increased vertical dimension. Initial evaluation of the MAD was made with axial magnetic resonance imaging and polysomnography on the first day of usage. Following evaluations were made on the third and sixth month. After a follow-up period of 6 months, Apnoea/Hypopnea Index (AHI) significantly decreased from 26.7 to 3.0. However, the average oxygen saturation did not improve as expected initially. The MAD therapy decreased the AHI scores of a patient with FP. At the end of a follow-up period of 6 months, the patient did not report any serious complaint except temporary tooth pains

Farklı Kök Kanal Genişletme Tekniklerinin Alt Çene Küçük Azı Dişlerinin Kırılma Dayanımı Üzerine Etkisinin İncelenmesi

Aim: The aim of this study was to evaluate the effect of different root canal instrumentation techniques on fracture strength of mandibular premolar teeth after root canal shaping. Methods: Fifty extracted human mandibular premolar teeth with one root and canal were used. All teeth were randomly divided into 5 groups according to the preparation techniques. Teeth were instrumented with SAF, ProTaper and LightSpeed LSX systems and Hedström hand files in each experimental group. After root canal preparation, fracture strength test was performed on the teeth, which is embedded in the acrylic resin block, at Instron test device. Results: Samples most resistant against fracture were negative control group followed by SAF group the samples of the hand files group. Samples with the least fracture resistance were observed in LightSpeed LSX group followed by the samples instrumented by Protaper rotary system. However, there was no statistically significant difference between the groups. Conclusion: There was no statistical difference between the effect of different root canal instrumentation techniques on fracture strength of mandibular premolar teeth (p>0.05)Amaç: Bu çalışmanın amacı, Self-adjusting file, LightSpeed LSX ve ProTaper sistemleri ile H-tipi el eğesinin insan alt çene küçük azı dişlerinin kırılma dayanımı üzerine etkisinin değerlendirilmesidir. Yöntem: Çalışmada çekilmiş tek köklü ve tek kanallı 50 adet alt çene küçük azı dişi kullanıldı. Genişletme tekniğine göre dişler rastgele 5 gruba ayrıldı. Her bir deney grubunda kök kanalları Self-adjusting file, LightSpeed LSX ve ProTaper döner sistemleri ve H-tipi el eğesi ile genişletildi. Kök kanal şekillendirmesi tamamlandıktan sonra akrile gömülü dişleri içeren silindirler Instron test cihazında kırılma dayanıklılık testine tabi tutuldu. Bulgular: Kırılmaya karşı en fazla direnç gösteren grup hiçbir genişletme uygulanmamış kontrol grubudur. Kontrol grubunu sırasıyla SAF, H-tipi el eğesi, ProTaper ve en son LightSpeed LSX grubudu izlemektedir. Ancak deney grupları arasında kırılma dayanımı açısından istatistiksel olarak anlamlı bir fark bulunmadı (p>0.05). Sonuç: Çalışmamızda kullandığımız dört farklı kanal genişletme sisteminin dişlerin kırılma dayanımı üzerindeki etkileri arasında istatistiksel fark bulunmad

Farklı Kök Kanal Genişletme Tekniklerinin Kök Kanal Dentininde Defekt Oluşumuna Etkisi

OBJECTIVE: The purpose of this study was to evaluate the dentinal defects which was occured by four different shaping systems (Protaper, LightSpeed LSX, Self Adjusting File ve H-File) after root canal instrumentation. METHODS: The root canals of fifty extracted human mandibular premolar teeth were instrumented with Self-adjusting file, ProTaper, LightSpeed LSX Ni-Ti systems and Hedstr;ouml;m hand files. Roots were then sectioned at 3, 6, and 9 mm from the apex, and photographs were taken under X 20 magnification using a stereomicroscope. All photographs was scored as defect (+) or no defect by two independent observer. RESULTS: Although there were no difference at apeks, 3mm and 6 mm between the experimental groups, statistically significant dentin defects was observed in LightSpeed LSX group when compared with control group. LightSpeed LSX and Protaper caused significantly more dentin defects than SAF system (SAFProTaper p=0,038 SAF-LightSpeed p=0,022). CONCLUSION: More dentin defects were observed in the LightSpeed LSX and ProTaper groups because of working with high speed and tork with LightSpeed LSX files and large taper design of ProTaper instruments.AMAÇ: Self -adjusting file, LightSpeed LSX, ProTaper ve H-tipi el eğesi ile genişletilen daimi insan alt küçük azı dişlerinde genişletme sisteminin kök kanal dentini üzerindeki defekt oluşumuna etkisinin incelenmesidir. YÖNTEM: Çalışmada 50 adet periodontal nedenlerle çekilmiş insan alt küçük azı dişi kullanıldı. Tüm gruplarda 10 ar adet örnek olacak şekilde dişler rastgele 5 gruba ayrıldı. Kök kanallarında Self-adjusting file, ProTaper, LightSpeed LSX sistemleri ve H-tipi el eğeleri ile genişletme ve şekillendirme işlemi tamamlandı. Ardından kök ucundan itibaren koronale doğru 3, 6 ve 9 mm'lerden kesitler alındı. Kök ucunun ve elde edilen kesitlerin x20 büyütmede stereomikroskopta fotoğrafları çekildi. Fotoğraflar iki tarafsız gözlemci tarafından defekt var ve defekt yok olmak üzere 2 skorlu sistem ile değerlendirildi. BULGULAR: Kök ucu, 3 mm ve 6 mm'de sistemler arasında fark görülmezken, 9 mm de LightSpeed LSX grubunda kontrol grubuna göre anlamlı derecede defekt gözlendi. LightSpeed LSX ve ProTaper gruplarında SAF grubuna kıyasla istatistiksel olarak anlamlı derecede daha fazla dentin defekti gözlendi (SAF-ProTaper p=0,038 SAF-LightSpeed p=0,022). SONUÇ: Yüksek hız ve torkta çalışan LightSpeed LSX ile artan konisiteye sahip ProTaper döner alet sistemlerinin dentin üzerinde daha fazla defekt oluşumuna neden olduğu görüldü

In Vitro Evaluation of Microleakage Properties of Etched/Non-Etched Air- Abraded and Conventionally Prepared Cavities: A Scanning Electron Microscopy Study

Statement of the problem: Air-abrasion is an alternative cavity preparation technique using aluminum oxide particles and there is still a lack of microleakage for different cavity forms and restorative materials.Objective: The aim of the study is to evaluate microleakage of etched/non-etched cavities prepared with air-abrasion and conventional technique using light and scanning electron microscopy.Materials & Methods: 69 non-carious human molars were selected and randomly allocated to 9 groups: Group 1 (G1), Group 2 (G2), Group 3 (G3), Group 4 (G 4), Group 5A (G5A), Group 5B (G5B), Group 6A (G6A), Group 6B (G6B), Group 7 (G7). Class I cavities were prepared on the G1, G2, G5A, and G5B samples with air-abrasion technique whereas conventional method was used on the samples of G3, G4, G6A, and G6B groups. G7 was assigned as the control group. Adhesive and composite were applied without using acid etching in G1 and G3. G2 and G4 samples were acid etched prior to the bonding and composite application. The cavities of G5A and G6A samples were filled with temporary filling material. The G5B and G6B samples were not restored. No preparation or restoration was performed on G7 group teeeth. All samples were stored in distilled water at room temperature until thermocycling. Then the samples were immersed in 50% diluted indian ink at 37°C for 48 hours prior to the sectioning, microscopic evaluation and, assessment of dye penetration. The Kruskal Wallis and Mann Withney U test were used for comparisons of the obtained data (α = .05 for all tests)Results: Statistically significant differences were found between Group 1 and 2, Group 1 and 3, Group 1 and 4, Group 2 and 3, Group 2 and 4, Group 3 and 4 (P < .05).Conclusion: Due to the results of this study, acid etching is essential for the restoration of air-abraded and conventionally prepared cavities to prevent microleakage