Effect of preetching on microleakage with all-in-one adhesives using calcium-based desensitizers: An in vitro study

Objectives: The aim of this study was to evaluate the effect of calcium-based desensitizers on the microleakage with and without preetching enamel in Class V cavities restored with all-in-one adhesives. Materials and Methods: Class V cavities were prepared on the buccal surfaces of 100 extracted human premolars. A total of 100 box-shaped cavities were divided into five groups (n = 20). Group 1 – no desensitizer was applied and Groups 2 and 4 – desensitizer (CCP-ACP and Novamin) was applied, respectively, followed by the application of G-Bond and restored with composite restoration. Groups 3 and 5 are same as Group 2 and 4, but preetching of enamel was done for 3 s after desensitizers application. The teeth were thermocycled and the specimens were examined for microleakage using methylene blue as a marker. The teeth were sectioned buccolingually and evaluated for microleakage under stereomicroscope and the scores obtained were analyzed with Kruskal–Wallis and Mann–Whitney tests. Results: Statistically significant difference existed between Groups 2 and 3 (P < 0.05). There was also statistically significant difference between Groups 4 and 5 (P < 0.05). Groups 3 and 5 showed significantly less microleakage (P < 0.05). No statistically significant difference in microleakage values was observed between the two desensitizers CCP-ACP and Novamin. Conclusion: The application of calcium-containing desensitizers with selective etch enamel technique in all-in-one adhesives could be considered an advisable procedure to minimize microleakage

Comparative assessment of effectiveness of Biomin, NovaMin, herbal, and potassium nitrate desensitizing agents in the treatment of hypersensitive teeth: A clinical study

Aim and Objectives: To compare the efficacy of four commercially available toothpastes in the treatment of dentinal hypersensitivity (DH). Materials and Methods: In a single-centered clinical trial, a total of 160 subjects were divided equally into four groups: group 1 – a toothpaste containing 5% fluoro calcium sodium phosphosilicate with fused silica (Biomin); group 2 – a toothpaste containing 5% CSPS (NovaMin); group 3 – herbal formulation; and group 4 – a toothpaste containing 5% potassium nitrate. The patient's DH scores for tactile, evaporative stimuli were recorded on a visual analog scale at baseline, 2 weeks, and at the end of 4 weeks. Results: All the four desensitizing toothpastes containing different active agents were effective in relieving DH. However, the Biomin group showed a better clinical response at the end of 4 weeks when compared with others. Conclusion: The Biomin group showed significantly better results compared with either NovaMin, herbal, and potassium nitrate toothpastes in the treatment of dental hypersensitivity symptoms

Clinical effects of reservoirs on gingival health using two different concentrations of home dental bleaching agents on fluorosed teeth: A comparative study

Objectives: To evaluate the effect of concentration and influence of reservoirs on the gingival mucosa of patients submitted to at-home bleaching with 10% and 35% carbamide peroxide (cp). Materials and Methods: A total of 20 patients were submitted to home bleaching with a 10% cp gel for 2 h/day for 3 weeks and 35% cp gel for 30 min/day for 3 weeks (n = 10). The custom-made mouth trays were made with a reservoir on only the left side and cut anatomically 1 mm beyond the gingival margin. Smears of the gingival mucosa were obtained by the exfoliation cytology in liquid media technique before (control), immediately after, and 30 and 45 days after the treatment. The samples were processed in the laboratory and evaluated for inflammation. Statistical analysis was carried out by McNemar test, two proportions test, independent paired t-test, and Wilcoxon test with a level of significance of 1%. Results: The presence of a reservoir in the custom tray resulted in an increase of inflammation immediately after the bleaching procedure. No significant differences were found in the degree of inflammation between the two groups at different period of observations. (P > 0.01). Conclusion: Ten percent and 35% cp bleaching gel caused gingival inflammation immediately after the procedure and persisted until 45 days after the bleaching treatment. The use of a reservoir in the custom tray for home bleaching resulted in higher rates and higher intensity of gingival inflammation

Comparative evaluation of cleaning ability of reciproc and waveonegold reciprocating file systems – A scanning electron microscopic study

Objective: The aim of this study was to evaluate the canal cleaning ability of two reciprocating single file systems: Reciproc (VDW, Munich, Germany) and WaveOne gold (Dentsply Maillefer, Ballaigues, Switzerland) using scanning electron microscopy (SEM). Materials and Methods: Forty freshly extracted human mandibular premolar teeth with single root and canal were selected. The samples were randomly divided into two experimental groups (n = 15 each). Control group (n = 10) has non-instrumented teeth. Working length was determined using #10/15 K files. All the teeth were prepared to a # 25 final apical size following the manufacturer's instructions using crown-down technique. Teeth were sectioned buccolingually and examined under SEM at 20.0 kV and ×700 magnification. SEM images of the coronal, middle and apical third of the canal were taken and then analyzed using a five-score index. Results: The WaveOne Gold group presented a larger amount of debris than the Reciproc Group, however, without a statistically significant difference (P > 0.05). A larger amount of debris in the control group was observed, with the statistically significant difference between Reciproc and WaveOne Gold groups (P < 0.05). Conclusion: The two reciprocating single-file instrumentation systems presented similar effectiveness for root canal cleaning