Background and Objective: evaluate the adhesion of adhesive restorations with and without a base of resinmodified glass-ionomer cement (RMGIC) to dentin irradiated with Er:YAG laser. Study Design/Materials and Methods: Twenty-four human molar teeth were divided into 6 groups (n=4): G1) 37% Phosphoric acid (PA) + Adhesive system (Ad) + Composite resin (CR); G2) RMGIC + CR; G3) Laser (60mJ-5Hz-20s) + PA + Ad + CR; G4) Laser (60 mJ-5 Hz-20 s) + RMGIC + CR; G5) Laser (100mJ-5Hz-20s) + PA + Ad + CR; G6) Laser (100mJ-5Hz-20s) + RMGIC + CR. Teeth were prepared, restored and cut into specimens, according to the treatment proposed and to methodology for microtensile test. Data were submitted to ANOVA and Tukey statistical tests (α=5% ). Results:. The mean values for adhesion (MPa) and standard deviation (±SD) were:
Investigate and compare the amount of reactive dentine formation after application of two different flunkies of low level laser. Rapid formation of reparative dentine is convenient, mainly when pulp is almost exposed. Several studies have shown that the use of correct fluency of low level laser can enhance cellular proliferation and seems to stimulate the production of reactive dentine. Using 780 nm infrared laser, twelve swine were tried using 3 teeth each. Three treatments groups were classified: GI -control group: without irradiation; GII -irradiation using fluency of 12.8 J/cm 2 ; and, GIII -irradiation using fluency of 89.7 J/cm 2 . Laser irradiation was performed on dentine (class V standardized) of the upper and lower incisors and on the apex of each tooth for 3 consecutive times, with a 72 h break of time. Histological studies were conducted at 4 distinct periods of time (8, 14, 28, and 52 days). GII showed increase on the formation of reparative dentine with significant difference (p < 0.01) between GI and GIII. Comparison between GI and GIII shows that there was no significant difference at 4 periods of time. After 52 days, the amount of reparative dentine was similar between GI, GII, and GIII. The dentinal matrix formation equal primary dentine occurred earlier in the GIII, GII, and GI, respectively. Our results suggest that into a twenty eight days period, the 12.8 J/cm 2 laser group was able to positively stimulate it, accelerating the odontoblast process and after 52 days, the formation of reactive dentine seems stabilized. C OLHistological results from GIII, considering fourteen days of period of time to evaluation
Dentin hypersensitivity is a common condition associated with high dental pain. A new LED-based (light emitting diode) light source has been used as an experimental tool in some studies. Purpose: The main objective was to compare these two light sources emitting in the same spectral band (redfrom 625 to 660 nm) to promote pain relief. Material and methods: A total of 6 sessions were accomplished, being three irradiation sessions and three follow-up sessions. This single-blind study compared a control group (Placebo) and two other groups with different equipments: low laser intensity treatment (LILT) and a light emitting diode system treatment (LEDT). Results: The results showed that there is no statistical difference between LILT and LEDT groups, however, both were better than control group (p ≤ 0.01) in terms of treatment efficiency; there is no difference between the second and the third sessions for both treatment, it means that the third session was not necessary; finally, the improvement at the end of the entire research (follow up care of 30 days) was very expressive in comparison to pre-treatment situation for all teeth (p ≤ 0.01). Conclusion: LILT and LEDT were equally effective to treat dentine hypersensitivity, a 3rd treatment session was not necessary/two sessions are enough.Irradiation spots (3 at the cervical area and 1 at the apex)
GV was highly statistically different from the others groups, even when compared with GVI, which means that dentists must use every method they can get to avoid a false-negative diagnosis.
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