The present study was conducted to evaluate the effects of some types of herbal tea on the shear bond strength (SBS) of orthodontic brackets to enamel surfaces. The brackets were bonded with ...Transbond XT to 90 extracted human premolar teeth and divided equally into six groups, that is, black, mint–mate herbal, mint–lemon herbal, and rosehip fruit tea and two control groups, Coca-Cola and distilled water. All groups were conditioned for three 5-minute sessions with equal intervening intervals for 90 days. The initial pH, SBS, and adhesive remnant index (ARI) of the groups were evaluated and the data were analysed statistically by Kruskal–Wallis and Mann–Whitney U-tests, one-way analysis of variance, and Duncan and Z-tests, respectively. Rosehip fruit tea (2.4 ± 0.07) and Coca-Cola (2.5 ± 0.05) had the lowest pH values. Coca-Cola (6.04 ± 1.11 MPa) and rosehip fruit tea (7.26 ± 1.11 MPa) significantly reduced the SBS to enamel (P < 0.001). The SBS results for the other groups were similar (P > 0.05). Except for the Coca-Cola group (ARI score = 0), fracture sites for all other groups were similar with the majority of bond failures at the enamel–adhesive interface (ARI score = 1). Although this experiment could not completely replicate the complex oral environment, it seems to confirm that Coca-Cola and rosehip fruit tea may be a causative factor in bracket–enamel bonding failure.
Bu in vitro çalışmanın amacı, kök yüzeyine açılmış kavitelerde asitle pürüzlendirme yerine uygulanan air abrazyonun 4 farklı tip kompozit rezinin mikrosızıntısı üzerine etkisini değerlendirmektir. ...Çalışmada, 80 maksiller anterior diş kullanıldı. Sement-mine birleşiminin 1 mm altında her bir dişin labial kök yüzeyine standart kaviteler 2x3 mm açıldı. Dişler önce rastgele 2 ana gruba ayrıldı n=40 . I.gruptaki dişlerin kavite marjinlerine 20 saniye %37’lik fosforik asit uygulanırken, II.gruptaki dişlerin kavite marjinlerine asit ile püzülendirme yerine 6 saniye air abrazyon Micadent uygulandı. Bu 2 ana grup daha sonra 4’er alt gruba ayrıldı n=10 . Dişlerin kaviteleri bir akıcı Flowline , bir ormoser esaslı Admira , bir hybrid- packable Glacier ve bir hibrid Charisma kompozit rezin ile restore edilerek halojen ışık cihazı Hilux Expert ile polimerize edildiler. Termal siklus işleminden sonra örnekler 24 saat %0.5’lik bazik fuksin içerisine yerleştirildi. Boya solüsyonlarının uzaklaştırılmasından sonra, kompozit dolguların ortasından geçecek şekilde dişlerden kesitler alındı, mikroskop ile incelendi Leica MZ 12, Wetzler, Almanya ve skala ile mikrosızıntı dereceleri skorlandı. Sonuçlar ANOVA and Mul-tiple Comparison testleri kullanılarak istatistiksel olarak değerlendirildi. Çalışmadaki hiçbir grup mikrosızıntıyı tamamıyla elimine edemedi. %37 fosforik asit uygulanmış akıcı kompozit Flowline grubu en az mikrosızıntıyı gösterdi ve diğer gruplardan istatistiksel olarak farklı bulundu p
Bu çalışmada, mikrohibrid Dynamic Plus ve nanoseramik Zenit yapıdaki iki farklı kompozit rezinin su emilimi ve çözünürlüğü üzerine alkol içeren Listerine Cool Mint ve içermeyen Signal White Now iki ...farklı ağız gargarasının 1 ve 7 gün sonundaki etkisinin değerlendirilmesi amaçlanmıştır. Her bir kompozit rezin için 30 adet örnek hazırlandı 10mmx2mm ve örnekler, her grupta 10 adet olacak şekilde rastgele 3 gruba ayrıldı. Piyasada bulunan iki farklı ağız gargarası alkol içeren Listerine Cool Mint ve alkol içermeyen Signal White Now test solüsyonu olarak, distile su ise kontrol grubu olarak seçildi. Tüm örnekler, kompozit rezinlerden nemin uzaklaşmasını sağlamak için desikatörde 37±1˚C'de 22 saat, daha sonra 23±1˚C'deki fırında 2 saat bekletildi. Her bir örneğin ağırlığı ve hacmi hesaplandı. Örnekler 1 gün ve 7 gün süreyle 37 ± 1 ºC'de etüvde 10 ml gargara/distile su ile dolu plastik şişelere konuldu. 1 gün ve 7 gün sonunda sıvıların içerisinden alınan her bir örnek hassas terazide tekrar tartıldı. Su emilimi ve çözünürlük değerlerinin hesaplanması BS EN ISO 4049:2000 standart metoduna dayanarak yapıldı. Veriler istatiksel olarak tek yönlü varyans analizi oneway-ANOVA ve Tukey HSD testi değerlendirildi. Tüm istatistiksel analizler için α=0.05 seviyesi anlamlı kabul edildi. İstatiksel analiz sonuçlarına göre, 1.gün ve 7.gün sonunda en yüksek su emilim değerlerini Dynamic Plus kompozit rezin Listerine Cool Mint gargarada, Zenit kompozit rezin ise Signal White Now gargarada bekletildiğinde göstermiştir. Çözünürlük değerleri açısından bakıldığında, her iki kompozit rezinde de hem gargaralarda hem de distile suda çözünürlük değerleri negatif olarak elde edilmiştir. Hem su emilimi hem de çözünürlük değerleri ISO 4049:2000 standartlarında belirlenmiş sınırlardan oldukça düşük bulunmuştur.
Whitening Dentifrices: A Review Deger, Ceren; Mujdeci, Arzu
Cyprus Journal of Medical Sciences,
12/2020, Letnik:
5, Številka:
4
Journal Article
Recenzirano
Odprti dostop
Whitening dentifrices are used in dental procedures for achieving aesthetic effects, such as tooth cleaning and stain removal. Today, owing to the effect of media, there is an increasing interest ...among individuals to have a healthy and beautiful smile, resulting in higher use of easily accessible whitening dentifrices. The whitening effect of whitening dentifrices is mostly attributed to their constituent abrasives or chemical, optical, or enzymatic ingredients. Thus, it is important to have updated knowledge regarding the ingredients, whitening efficacy, and mechanisms regarding the action of whitening dentifrices. Several dentifrices are available in the global market, and dentists should be aware that the selection of the most appropriate dentifrice is possible with correct knowledge about the content of each dentifrice. Based on their ingredients, certain whitening dentifrices may negatively affect dental hard tissues. Thus, dentists should warn patients about the potential adverse effects of whitening dentifrices on teeth and the negative consequences of dentifrices with unproven whitening claims. Keywords: Whitening dentifrices, abrasive, blue covarine, charcoal, activated carbon
Objective: The aim of this study was to evaluate the effect of four different mouthrinses on the surface roughness of two nanohybrid resin composites. Material and Methods: Fifty samples were ...prepared for each of the resin composites (2x8 mm) and a profilometer was used to determine the initial surface roughness (Ra) of each sample. Then, they were divided into 5 subgroups (n= 10), and exposed to the following mouthrinses (12h, 37 ºC): containing alcohol and essential oils; alcohol and chlorhexidine; alcohol-free and essential oils; alcohol free and cetil prydinium chlorite; or distilled water (control). The surface roughness of each sample was measured again. Statistical analyses of the data were performed via two-way ANOVA and Bonferroni tests. Results: Overall, statistically significant differences were not found between the resin composites (p> 0.05), but significant differences were found among the mouthrinses (p< 0.05). Interactions between the mouthrinses and the resin composites was statistically significant (p< 0.05). Both of the resin composites had the highest surface roughness after exposure to mouthrinse with alcohol and essential oils (p< 0.05), followed by mouthrinse with alcohol and chlorhexidine. Both alcohol-free mouthrinses caused surface roughness either similar to distilled water (p> 0.05) or lower than distilled water (p< 0.05) on the nanohybrid resin composites used. Conclusion: The mouthrinses affected the surface roughness of the resin composites in different ways. This was dependent on mouthrinse contents and the chemical structure of the resin composites. Alcohol-containing mouthrinses caused the most changes in the surface roughness of both resin composites.
Keywords
Alcohol; Chlorhexidine; Composite resin; Essential oil; Roughness.
The role of airborne-particle abrasion on the bond strength of restorative materials to enamel and dentin is controversial.
The purpose of this study was to evaluate the effect of airborne-particle ...abrasion on the shear bond strengths of 4 restorative materials to enamel and dentin.
One hundred twelve extracted human maxillary anterior teeth were divided into 2 groups of 56 teeth each. In the first group flat enamel surfaces were prepared, and in the second flat dentin surfaces were prepared. Half the teeth in each group (n=28) were airborne-particle abraded. The remaining 28 teeth in each group were prepared with silicone carbide paper (control). Specimens in both groups were divided into 4 subgroups (n=7). A composite, a compomer, a resin-modified glass ionomer cement, and a conventional glass ionomer cement were applied to enamel and dentin surfaces (3 mm diameter and 4 mm height). After 24 hours of storage in water, specimens were subjected to shear forces in a universal testing machine at a crosshead speed of 0.5 mm/min until fracture. Shear bond strength data (MPa) were analyzed with 3-way ANOVA and Tukey HSD tests (α=.05).
Airborne-particle–abraded specimens showed significantly higher shear bond strengths than control specimens. The 2-way interaction between tooth structure and restorative materials was significant.
The use of airborne-particle abrasion increased the shear bond strength of restorative materials tested to enamel and dentin.
It was observed that externally applied bleaching gels may penetrate into the pulp chamber. This study was conducted to evaluate the peroxide diffusion from two whitening strips into the pulp ...chamber. Twenty-four, human, extracted, maxillary central teeth were separated into three groups (
n = 8). All teeth were sectioned 3-mm apical to CEJ, the intracoronal pulp tissue was removed, and the pulp chamber was filled with acetate buffer. Vestibuler crown surfaces of teeth in the experimental groups were subjected to whitening strips; the teeth in the control group were exposed only to distilled water. The acetate buffer solution in each tooth was transferred to the tube. Leuco-crystal violet and enzyme horseradish peroxidase also were added to the tube. The pulpal peroxide was determined spectrophotometrically. The results indicated that the whitening strip containing 14% hydrogen peroxide presented a higher pulpal peroxide penetration than 6.5 % hydrogen peroxide (p < 0.001).
Bu çalışmanın amacı, 3 paint-on ağartıcıajanın bir kompozit rezin, bir kompomer ve bir yüksek viskoziteli cam iyonomer siman›n yüzey sertliği üzerine etkisini değerlendirmekti. Her bir restoratif ...materyale ait 50 örnek haz›rland› ve rasgele 5’er gruba ayr›ld› n:10 . Bir grup başlang›ç ölçümü için değerlendirildi ve Vickers yüzey sertlik ölçümü al›nd›. Diğer 3 gruptaki örneklere 3 paint-on ağartma ajanlar›ndan biri uyguland›. Kalan son grup kontrol grubu olarak değerlendirildi ve herhangi bir ağartma işlemi uygulanmad›. Kontrol ve tedavi grubu örnekleri başlang›ç ölçümleri ile ayn› şekilde yüzey sertlik ölçümüne maruz b›rak›ld›. Veriler istatistiksel olarak analiz edildi. Toplamda, tüm ağartma gruplar›nda yüzey sertliğinde azalma kaydedildi. Restoratif materyaller aras›nda da yüzey sertliğinde farkl›l›klar izlendi. En düşük yüzey sertliği cam iyonomer simanda, en yüksek de kompozit rezinde görüldü. Ayr›ca, ağartma ajanlar›n›n yüzey sertliği üzerine etkisinin, kullan›lan restoratif materyale bağl› olduğu bulundu.
The aim of this study is to examine the effects of ozone treatment applied at two different times, followed by the in vitro application of a reductant solution, on the shear bond strength of four ...different restorative materials to enamel and dentin. A total of 400 caries-free human molar teeth were randomly divided into enamel and dentin groups, and each was divided into five subgroups. The O20 group received 20-s ozone, O20 + R received 20-s ozone+reductant solution, O80 received 80-s ozone, O80 + R received 80-s ozone+reductant solution, and C was the control group. Each subgroup was then divided into four more subgroups based on restorative material (i.e., nanohybrid resin composite, silorane-based microhybrid resin composite, compomer, or conventional capsulated glass ionomer cement). After water storage for seven days, shear bond-strength data (MPa) were measured using a universal testing machine at a crosshead speed of 0.5 mm/min until fracture, and failure types were examined. The effects of ozone and ozone+reductant applications on enamel and dentin were examined via scanning electron microscopy (SEM). Bond strength data were statistically evaluated using a three-way analysis of variance and Tukey's honestly significant difference test (a
= 0.05). The bond strength of the control group was like that of the O20 group (p > 0.05), but it was higher than all other groups regardless of the type of restorative material or tooth structure (p < 0.05). Adhesive-type failures were found in most groups. Via SEM examinations, it was observed that ozone applications did not change the enamel morphology, but they did cause narrowing of the dentinal tubule openings in O80 + R.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
To evaluate the effects of two bleaching gels and two whitening strips on surface hardness of four resin composites in vitro.
60 cylindrical samples of each composite (Surefil, Charisma, Admira, ...Flowline) were prepared (4 mm thickness and 6 mm diameter) and stored in distilled water at 37 degrees C for 24 hours. These samples were randomly divided into six test groups (n=10). One group was selected for baseline and Vickers microhardness measurements (load= 100 g, dwell time 20 seconds) were taken immediately. The other groups were treated for 21 days with one of the following: distilled water (control), containing 10% carbamide peroxide bleaching gel (Perfect Bleach), 16% carbamide peroxide bleaching gel (Viva Style), 5.3% hydrogen peroxide whitening strips (Crest Whitestrips) and 14% hydrogen peroxide whitening strips (Crest Whitestrips Supreme). The treated samples were also subsequently subjected to the same microhardness testing by using the same method as applied to the baseline measurements. Data were analyzed statistically (alpha = 0.05).
Overall, the lowest surface hardness value was observed in baseline measurements. An increase in surface hardness was noted in all of the other groups. The higher surface hardness values were found in control, whitening strip (5.3% HP) and bleaching gel (10% CP) groups than whitening strip (14% HP) group. Bleaching gel (16% CP) was statistically different from only baseline measurements. In addition, regardless of the tested groups, statistically significant differences in surface hardness were observed between composite materials. Surefil showed the highest hardness values while Flowline presented the lowest hardness values.
PDF
