Ayşegül Ölmez

A histopathologic study of direct pulp-capping with adhesive resins

OBJECTIVE The purpose of this study was to evaluate the histologic pulp responses of Optibond and Syntac adhesive resin systems placed directly on exposed pulp tissues. STUDY DESIGN Class V facial cavities with pulpal exposures were prepared in dogs. After acid etching of enamel margins, the cavities were restored with a composite resin after pulp-capping with one of the dentin bonding agents. The remaining exposures were capped with calcium hydroxide and amalgam as controls. The animals were killed after 7, 21, and 90 days and the pulps were evaluated histologically. Statistical analysis was carried out with the chi-square test. RESULTS There was no statistically significant difference with respect to inflammatory cell response, fibrosis, bleeding, or bacterial staining criteria over the time intervals of evaluation among the Optibond, Syntac, and calcium hydroxide groups. New dentin formation was also observed for all of the groups at the end of 90 days. CONCLUSION The results of direct pulp-capping with a dentinal adhesive and composite resin appear promising but further in vivo studies are recommended.

Factors affecting the timing of teething in healthy Turkish infants: a prospective cohort study

BACKGROUND Teething is a developmental process and occurs over a broad chronological age range. OBJECTIVE The objective of this study was to evaluate the effects of feeding pattern and growth parameters on teething time of healthy infants. METHODS A total of 1200 term newborn infants followed up in Gazi University well-child clinic infants were evaluated, and their growth parameters, feeding patterns, and timing of the eruption of the first tooth were noted. The routine visit times of the clinic were chosen as the cut-off values for teeth eruption for logistic regression analysis for investigating factors that determine the timing of teeth eruption. RESULTS Timing of the eruption of the first tooth ranged from 4 to 13 months. On the sixth month visit, 24.3%, and on the ninth month visit 84.5% of all infants had at least one tooth. Height-adjusted weight and height percentiles being less than 50, being fed by cows milk or by formula in the first year, were independent factors negatively influencing teeth eruption by the sixth month, while all but height-adjusted weight percentiles being less than 50 had negative impact on tooth eruption by the ninth month. CONCLUSION Growth parameters and feeding pattern may be determinants of the timing of teeth eruption in healthy infants.

Bond strength of adhesive systems to mineral trioxide aggregate with different time intervals.

INTRODUCTION The aim of this study was to compare the shear bond strengths of various adhesive systems to white mineral trioxide aggregate (WMTA) with different time intervals. METHODS Two hundred cylindrical acrylic blocks with a hole (4-mm diameter and 2-mm height) were prepared. The holes were filled with WMTA, and the specimens were allocated into 5 groups. Forty specimens were stored for 4, 24, 48, 72, and 96 hours at 37°C and 100% humidity. Each group was divided into 4 subgroups: group 1, All-Bond SE (Bisco Inc, Schaumburg, IL); group 2, All-Bond 3 (Bisco Inc); group 3, One-Step Plus (Bisco Inc); and group 4, control. After the application of adhesive systems, composite resin (Aelite, Bisco) was applied over the WMTA. Shear bond strengths were measured using a universal testing machine, and the data were subjected to 1-way analysis of variance and the Scheffé post hoc test. RESULTS There was a significant difference between the 4-, 24-, 48-, 72-, and 96-hour measurements in all of the adhesive systems (P < .001). Among all time intervals, group 3 showed significantly higher bond strengths to WMTA than the other groups (P < .001). Groups 1 and 2 were similar (P = .365). CONCLUSIONS It was concluded that if a longer waiting time can be practiced after the mixing of WMTA, higher shear bond strength measurements can be obtained. Also, when WMTA was used with total-etch adhesive systems, it showed better shear bond strength.

The Efficiency of a New Polishing Material: Nanotechnology Liquid Polish

INTRODUCTION This study evaluated the efficiency of a nanotechnology liquid polish system on the surface roughness of two different types of nano resin composites. METHODS AND MATERIALS The resin composite materials tested in this study were Ceram-X (Dentsply) and Clearfil Majesty Esthetic (Kuraray). Forty standard samples of each resin composite material were prepared and stored in artificial saliva at 37 degrees C for one week. The samples of each material were randomly assigned to one of four test groups (n = 10) and contoured with carbide burs, except for Group 1 (control). Group 2 was treated with aluminum oxide-impregnated polymer points (Enhance Finishing System, Dentsply), followed by diamond-impregnated micropolishing points (PoGo, Dentsply); whereas Group 3 was treated with only a nanotechnology liquid polish system (Lasting Touch, Dentsply) and Group 4 was treated with aluminum oxide-impregnated polymer points and diamond-impregnated micropolishing points, then the nanotechnology liquid polish system. Surface roughness values (Ra) of all samples were obtained with an optical pro-filometer. The difference between the groups was assessed with one-way analysis of variance and the Kruskal Wallis test. RESULTS All finishing and polishing techniques created statistically rougher surfaces than the control group (p < 0.001). The lowest Ra values were detected in Group 4, although significant differences were not found between Groups 2 and 4 (p > 0.001) independent of the type of resin composites. CONCLUSION With the combination of finishing and polishing procedures, a nanotechnology liquid polish application may provide a more glossy surface for resin composite restorations.

Morphological analysis of the resin-dentin interface in cavities prepared with Er,Cr:YSGG laser or bur in primary teeth.

OBJECTIVE The purpose of this study was to analyze the resin-dentin interface in cavities prepared with laser or bur in primary teeth. BACKGROUND DATA Erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser was expected to be an alternative cavity preparation method, enhancing surface alterations and producing morphological changes. METHODS Twenty extracted primary molar teeth were divided to four groups according to one of four cavity preparation and pretreatment regimens: Er,Cr:YSGG laser (G1), Er,Cr:YSGG laser+acid-etching (G2), bur (G3), and bur+acid-etching (G4). After applying composite resin to the cavities, the teeth were sectioned. The resin-dentin interface was analyzed under scanning electron microscopy (SEM) and ion analysis was performed with SEM-energy-dispersive X-ray spectroscopy (EDX) after immersion in ammoniacal silver nitrate solution. RESULTS In G1 and 2, the surfaces were wavy, and in G3 and 4, the surfaces were smooth. Microcracks were seen in some of the lased cavities. In G1 and 2, dentin tubules were exposed and there was lack of a smear layer. In G3, there were gaps and a smear layer in the resin-dentin interface, but no gaps or smear layer were observed in G4. In G2, the resin tags were increased, and some resin tags were broken in cavities, which were prepared with laser (G1 and 2). CONCLUSIONS According to the results of this study, acid-etching was recommended after laser preparations, to have a better adhesion.

Comparison of laser fluorescence devices for detection of caries in primary teeth.

The aim of this in vivo study was to evaluate the performance of fluorescence-based devices in detecting occlusal caries lesions in primary molars compared with conventional methods. Two examiners assessed 44 occlusal surfaces of first and second primary molars in 20 patients using two fluorescence devices: DIAGNOdent (LF) and DIAGNOdent pen (LFpen). Teeth were also assessed by visual examination and bitewing radiograph. Histological examination served as the gold standard after extraction. By using the McNemar test, the sensitivity, specificity, accuracy, and area under the receiver operating curve were calculated as outer enamel (D1), inner enamel (D2) and dentine caries (D3) lesion thresholds. The intra- and inter-examiner reproducibility were calculated using the Cohens unweighted kappa statistics. At the D1 threshold, the LFpen sensitivity was statistically higher than LF and radiographic examination (P < 0.001), whereas there was no statistically significant difference among the groups at the D2 and D3 thresholds (P > 0.05). All methods demonstrated the highest sensitivity values at D3. At the D1 and D2 thresholds, there were no significant differences between the LFpen specificity and the other methods. All methods presented similar performance in detecting all lesions considering the area under the receiver operating curve. The LFpen showed better performance than LF. Furthermore, visual examination and the LFpen device seem to be sufficient for detection of occlusal caries in primary molars.

Maturogenesis of an Early Erupted Immature Permanent Tooth: A Case Report With 7-Year Follow-Up.

The main objective of treatment of an undeveloped tooth (immature) is to provide vital pulp therapy to allow continued development of root dentin. A case report is presented that demonstrates the use of calcium hydroxide (CaOH₂) as an indirect pulp-copping material for the purpose of continued maturogenesis of an early-erupted permanent tooth with severe mobility and almost-begun root formation. Seven-year radiographic and clinical follow-up demonstrated a vital pulp and physiologic root development without any endodontic failure clinically or radiographicaly.

Does placement of rubber dam effect the arterial oxygen saturation in children? A clinical study

Abstract The aim of this study was to evaluate the effect rubber dam placement on the arterial oxygen saturation level in children. Thirty children were randomly allocated to one of two groups: Group A — 15 patients in this group had rubber dam isolation of the maxilla, and Group B — 15 patients had rubber dam isolation of the mandible. The children were healthy and cooperative. The arterial oxygen saturation was taken before each injection, before starting the intervention, i.e. 5min after the injection, and at 5-min intervals. All SpO 2 values were recorded every 30 seconds over a 30 minute period. There were no statistically significant differences in arterial oxygen saturation in all reading sessions for both groups ( P >0.05). The use of rubber dam did not decrease the arterial oxygen saturation level in children.