A case of extensive crown fracture associated with intrusion of the permanent maxillary central incisors in an 8-year-old boy is reported. The treatment of both injured teeth included attempts of apexification and arrest of root resorption with calcium hydroxide. After 8 months of the trauma, there was no calcified barrier formation in the apex. Mineral trioxide aggregate (MTA) was then used as a filling material. At 15-month follow up, the teeth were asymptomatic and correctly sealed, the external inflammatory root resorption had stopped, and the radiolucent image had disappeared, which meant the initial healing of the periapical lesion. MTA may be considered as an alternative option for the treatment of traumatized and immature permanent teeth.
This in vitro study evaluated the impact of initial erosion on the susceptibility of enamel to further erosive challenge. Thirty bovine enamel blocks were selected by surface hardness and randomized into two groups (n = 15): GC- group composed by enamel blocks without erosion lesion and GT- group composed by enamel blocks with initial erosion lesion. The baseline profile of each block was determined using the profilometer. The initial erosion was produced by immersing the blocks into HCl 0.01 M, pH 2.3 for 30 seconds, under stirring. The erosive cycling consisted of blocks immersion in hydrochloric acid (0.01 M, pH 2.3) for 2 minutes, followed by immersion in artificial saliva for 120 minutes. This procedure was repeated 4 times a day for 5 days, and the blocks were kept in artificial saliva overnight. After erosive cycling, final profile measurement was performed. Profilometry measured the enamel loss by the superposition of initial and final profiles. Data were analyzed by t-test (p<0.05). The result showed no statistically significant difference between groups (GS = 14.60±2.86 and GE = .14.69±2.21 μm). The presence of initial erosion on bovine dental enamel does not enhance its susceptibility to new erosive challenges.
Objective The present study analyzed xylitol concentrations in artificial saliva over time
after application of varnishes containing 10% and 20% xylitol. Material and Methods Fifteen bovine enamel specimens (8x4 mm) were randomly allocated to 3 groups
(n=5/group), according to the type of varnish used: 10% xylitol, 20% xylitol and
no xylitol (control). After varnish application (4 mg), specimens were immersed in
vials containing 500 µL of artificial saliva. Saliva samples were collected in
different times (1, 8, 12, 16, 24, 48 and 72 h) and xylitol concentrations were
analyzed. Data were assessed by two-way repeated-measures ANOVA (p<0.05). Results Colorimetric analysis was not able to detect xylitol in saliva samples of the
control group. Salivary xylitol concentrations were significantly higher up to 8 h
after application of the 20% xylitol varnish. Thereafter, the 10% xylitol varnish
released larger amounts of that polyol in artificial saliva. Conclusions Despite the results in short-term, sustained xylitol releases could be obtained
when the 10% xylitol varnish was used. These varnishes seem to be viable
alternatives to increase salivary xylitol levels, and therefore, should be
clinically tested to confirm their effectiveness.
After 8 months, the lesion had completely regressed, meaning that the girl did not have to be exposed to unnecessary surgical procedures in her first few days of life. The eruption of the upper anterior teeth was not affected.
This study suggests that the operating microscope performed better than the fluorescence-based device and could be an auxiliary method for the detection of DEDs.
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