Immediate dentin sealing: effect of sandblasting on the layer thickness.

OBJECTIVES: The objective of this study was to observe and to measure the impact of corundum sandblasting on the thickness of the Immediate dentin sealing layer. METHODS: 20 recently extracted molars were collected and divided randomly into two groups. A standardized preparation was performed on each tooth and the Optibond FL dentin bonding agent (Kerr, Orange, USA) was applied on the prepared surface according to the manufacturer's instructions. The surface was then partially sandblasted. RONDOflex plus 360 (KaVo, Bieberach an der Riss, Germany) and Airsonic Mini-Sandblaster (Hager et Werken, Duisburg, Germany) were used. Microscope observations were made. RESULTS: The arithmetic mean of the Optibond FL dentin bonding agent film thickness was 48.72 µm (Group 1=45.55 µm and Group 2=51.88 µm). The dentin bonding agent layer thickness was reduced to the average value of 17,12 µm by RONDOflex plus 360 sandblasting (Group 1). The zero value was recorded in 16 % of the locations. The Airsonic Mini-Sandblaster sandblasting changed the average thickness of the dentin bonding agent layer to 13.25 µm with 31 % of zero values (Group 2). CONCLUSION: The results of this research lead to a reflection on modifications of the immediate dentin sealing procedure (Tab. 4, Fig. 3, Ref. 28).

Prospective longitudinal study of early childhood caries and developmental defects of enamel on permanent successors in children in the Czech Republic.

AIM: This study investigates the influence of early childhood caries (ECC) on the occurence of developmental defects of enamel (DDE) on permanent teeth. METHODS: Study design: This prospective original study was conducted to monitor the relationship between ECC in primary dentition and DDE as their consequences on permanent successors. One hundred and forty children were recruited and included in the study group with diagnosed ECC (ECCG) (N=60) or the control group (CG) (N=80). Deciduous upper central incisors were assessed for existing dental caries according to the dmft index and the modified pufa score and permanent incisors were examined using the modified DDE index. RESULTS: Prevalence of DDE was 19.3% in the whole sample; in ECCG it was 24.2% and 12.6% in CG. The most common defect was diffuse opacity with a prevalence of 44.8% in ECCG and 72% in CG. Prevalence of hypoplasia was 13.8% in ECCG, in CG it was present as a combination defect with a prevalence of 4%. The extent of less than 1/3 of labial aspect was in 69% of defects in ECCG,in CG it was 52%. The location of defects in the incisal third was 48.3% in ECCG and 32% in controls. CONCLUSION: A statistically significant relationship between ECC and DDE was not observed. The results were compared with studies about the relationship between ECC and DDE.

[Esophageal disorders in patients with irritable bowel syndrome].

AIM: To study the whole range of esophageal disorders in patients with irritable bowel syndrome (IBS) using high-tech methods. MATERIALS AND METHODS: 102 IBS patients (47 males, mean age 40.8, diagnosis of IBS was established according to Rome III criteria) with esophageal symptoms (heartburn, belching, globus sensation and noncardiac chest pain) were examined in gastroenterology department. All patients underwent endoscopy, with biopsies if required, X-ray examination of upper gastrointestinal tract; 24-hour pH-impedance monitoring;13C-urea breath test. Evaluation of esophageal symptoms was carried out on the basis of Rome IV criteria. RESULTS: 21 (20.6%) individuals had esophagitis (ERD). According to 24-hour pH-monitoring data, 7 of them had overlap between GERD and functional esophageal disorders (FED). 27 (26.5%) individuals had nonerosive reflux disease (NERD). In 54 (52.9%) individuals endoscopy and pH-impedance monitoring data did not differ from normal, suggesting this group as group of patients with FED. There was no significant difference for age, sex and IBS subtypes in GERD, NERD and FED groups. CONCLUSION: Comorbid esophageal disorders in patients with IBS are different and represented by organic diseases, FED and overlap between them. Methods such as 24-h pH-impedance measurement and esophageal manometry should be used to assess comorbid esophageal disorders in IBS patients.