The purpose of this study was to evaluate the effect of smear layer on penetration of four root sealers into dentinal tubules. Sixty-four, recently extracted, human maxillary and mandibular incisors were used. Following removal of the crowns, the pulps were extirpated and the root canals instrumented. The teeth were then divided into two groups. The teeth in the control group were irrigated with saline solution and the experimental group treated with EDTA and NaOCl. Each main group was then divided into four sub-groups and the root canals filled with Diaket, N2 Universal, SPAD and Forfenan as recommended by the manufacturers. The teeth were split longitudinally and examined using scanning electron microscopy. A quantitative assessment was made of sealer penetration into the dentinal tubules in the coronal, middle and apical parts of each root canal. It was observed that the smear layer obstructed the penetration of the tubules by the sealers. However, in the experimental group, the penetration into dentinal tubules was better with Diaket, N2 and SPAD, than with Forfenan (P < 0.01). It was concluded that this penetration could be affected by physical and chemical properties of root canal filling materials.
OZET Bu calismada sabit ortodontik tedavi goren bireylerde asitle daglama ve adeziv uygulanmis dislerde cola ve benzeri asitli iceceklerin mineye etkisinin belirlenmesi amaclanmistir Asitli icecek olarak Coca-Cola, Fanta, Gazoz ve Soda kullanilmistir. Disler oncelikle iki ana gruba ayrilarak ilk gruba sadece asitle daglama diger gruba ise asitle daglamanin ardindan adeziv uygulanmasi islemleri yapilmistir. Her bir grup da kendi icinde 4 gruba ayrilarak belirtilen icecekler uygulanmistir Disleri asitli iceceklerde tutabilmek icin yapay bir agiz ortami yaratmak amaciyla cihaz yapildi. Cihaz disleri 2 saat boyunca sentetik tukurukte, 15 dakika oda sicakligindaki asitli icecegin icinde tutacak sekilde planlandi. Bu islemler herbir icecek icin 5 gun boyunca uygulandi. Kontrol grubu olusturmak amaciyla bir baska grup dis de 5 gun boyunca sadece sentetik tukurukte bekletildi. Tum bu islemlerden sonra disler yikanip temizlendi ve SEM icin hazirlandi. SEM calismasinda asitli icecekler ile temas eden yuzeyler ile k...
Summary Detrimental effects exerted on oral and dental tissues by frequent mouthrinse use are observed, but studies about their effects on aesthetic restorative materials are limited. In this study, the purpose was to examine the effects of three proprietary mouthrinses on three different aesthetic restorative materials. Mouthrinses were used as treatment groups, while distilled water served as the control. From a total of 72 specimens, each experimental group consisting of 24 samples were prepared from each restorative test material by using metal moulds. The samples were stored in 20 mL of one of the mouthrinses for 12 h, which was reported as the equivalent time to 1 year of 2‐min daily mouthrinse use. Changes between baseline and after treatment measurements of surface microhardness and colour of the test materials were established by using Vickers microhardness tester and spectrophotometer. Statistical analyses were performed by analysis of variance ( anova ), with Bonferroni correction. The level of significance was set as 0·05 in all tests. There were no significant interactions between the test solutions and the test materials with regard to microhardness ( P > 0·05), and colour changes of the materials ( P > 0·05). Effects of mouthrinses on restorative materials may differ depending on many in vivo factors that could not be replicated in vitro . Therefore, routine assessment of the effects of mouthrinses on aesthetic restorative materials is recommended.
Our aim was to compare the Accu-I-Tomo (3DX), the Digora Optime image plate system and F-speed film in detecting chemically created apical lesions.Lesions were created by applying perchloric acid apical to extracted teeth in jaw specimens for 1, 1.5 or 2 h. After being repositioned, teeth were radiographed with Accu-I-Tomo limited cone beam CT (LCBCT), Digora Optime storage phosphor plates (SPP) and F-speed films. Six observers scored the presence of lesions using a five-grade scale. The accuracy of each observer and modality was assessed through receiver operating characteristic (ROC) analysis and A(z) values were compared using two-way ANOVA. Pairwise comparisons of imaging systems were carried out using the Mann-Whitney U-test. Differences in A(z) values were compared using Friedman and Dunn's tests. Kappa (kappa) was used to measure interobserver agreement.The A(z) values were larger for LCBCT than for SPP and film for all acid durations. For 1 h of acid duration a significant difference was found between LCBCT and film (P = 0.02) and between LCBCT and SPP (P = 0.0043), For 1.5 h a significant difference (P = 0.006) was found between LCBCT and SPP only. For 2 h acid duration, there was no significant difference between LCBCT and film or SPP (P>0.05). Between SPP and film no significant difference was found for any acid duration (P>0.05). kappa ranged between fair and moderate for LCBCT and between slight and fair for SPP and film.LCBCT images provided better than or similar detectability as film and SPP images of chemically created periapical lesions.
