Please activate JavaScript!
Please install Adobe Flash Player, click here for download
ePaper created 2017-10-05, 09:25:28 | version 1.38.0
laser_case report less of the treatment modality we used. After laser irradiation, no carbonisation, cracks or other side- effects could be detected. In Groups 2 and 4 (without pH-cycling), no struc- tural effects were observed, whereas changes of dif- ferent width indicated by staining were recorded in Groups 1 and 3 (with pH-cycling). These patterns were measured at three points and the average value was calculated (Fig. 3). With the help of a measuring scale, the width of these patterns was converted into micrometres. There was no statisti- cally significant difference between the effect of the laser with or without absorber application in Groups 1 and 3 (Mann–Whitney test, p > 0.05; Table 1). In Group 3 (without a smear layer), no statistically sig- nificant differences between the different surface treatments and the width of the pattern were ob- served (Friedman test, p > 0.05; Table 1), whereas statistically significant differences in Group 1 (with a smear layer) in the width of the pattern were found (Friedman test, p < 0.05; Table 1) after fluoridation and after laser irradiation (Wilcoxon signed-rank test, p < 0.05; Mann–Whitney test, p < 0.05; Table 2). After fluoridation, the average width of these pat- terns was approximately 43 µm compared with 60 µm after laser irradiation. SEM examination Under SEM examination, ultrastructural changes in the dentinal structure were observed. Six different structural and morphological markers were recorded: 1. Wide-open tubules (Fig. 4a) 2. Partly occluded or narrowed tubules (Fig. 4b) 3. Surfaces with impressions of tubule orifices (Fig. 4c) 4. Smooth and unstructured surfaces (Fig. 4d) 5. Surfaces with superficial precipitation (Fig. 4e) 6. Melted surfaces (Fig. 4f). In a few cases, cracks and superficial pellets were observed, but the results were not predictable. After qualitative analysis of these structural changes, sta- tistical analysis was performed using the chi-square test (p = 0.05 significance level). No statistically significant differences between laser application in Groups 1–4 with or without absorber application (chi-square test, p > 0.05) and in Groups 1, 2, 3 and 4 with and without ab- sorber application prior to laser treatment com- bined (chi-square test, p > 0.05) were observed (Table 3). register for FREE – education everywhere – no time away from and anytime the practice – live and interactive – interaction with webinars colleagues and experts – more than 1,000 archived across the globe courses – a focused discussion forum – a growing database of scientifi c articles and case reports – free membership – ADA CERP-recognized no travel costs credit administration www.DTStudyClub.com Dental Tribune Study Club Join the largest educational network in dentistry! ADA CERP is a service of the American Dental Association to assist dental professionals in identifying quality providers of continuing dental education. ADA CERP does not approve or endorse individual courses or instructors, nor does it imply acceptance of credit hours by boards of dentistry. 3_2017 laser 4141