Journal of Conservative Dentistry最新文献

Successful endodontic treatment relies upon a thorough knowledge of root canal anatomical variations along with proper diagnosis, treatment planning, and clinical expertise. One of the difficult root canal configurations that are frequently encountered commonly in mandibular second molars is C-shaped root canal. Due to the intricate root canal configuration, it is often difficult to negotiate, debride, and obturate such canals leading to failure of root canal treatment. Understanding the anatomical variation and adequate visualization will enable the clinician to manage these cases effectively. Advanced irrigation and obturation techniques help in managing such anomalous canal configurations. This article presents the management of two different C-shaped root canal configurations under dental operating microscope using thermoplasticized obturation techniques.

Objective: This study compared the potential for apical extrusion of sodium hypochlorite (NaOCl) when using needle irrigation (NI), passive ultrasonic irrigation (PUI), passive subsonic irrigation (PSI), and negative pressure system (NP).

Materials and methods: One hundred freshly extracted human permanent anterior teeth with complete root formation were embedded rigidly in agarose gel-containing cresol purple. Teeth were randomly allocated to six groups: G1-NI; G2-PUI; G3-PSI; G4-NP; G5-positive control; and G6-negative control. The chemomechanical preparation was completed and 12 ml of 3% NaOCl was delivered for 180 s in all groups. Dye diffusion was standardized by doing gel photography after the NaOCl final irrigation the Chi-square test and Kruskal-Wallis one-way analysis of variance test were used for the data analysis.

Results: G1 had statistically significant apical extrusion compared to G2 (P = 0.001), G3 (P = 0.001), and G4 (P = 0.001) groups. G4 showed the least amount of apical extrusion.

Conclusions: pH-sensitive gel model is useful in evaluating NaOCl extrusion. NP produced least NaOCl extrusion as compared to the other three systems. Due consideration should be given to the potential for apical extrusion of the irrigant before the selection of an irrigation system.

Background: The sealing ability of different liners under composite restorations in the reduction of microleakage.

Aim: To evaluate the effects of three different liners in sandwich techniques on gingival microleakage of class II composite restorations.

Materials and methods: Standardized Class II box cavities were prepared on forty premolar teeth and randomly divided into four groups, n = 10: Group A, no liner (control); Group B, Polofil NHT Flow; Group C, Ionolux; and Group D, Fuji VII. The etching, bonding, and process for restoring the whole remaining mass of the cavities with G-aenial composite were the same, with the sandwich material expectations. Dye penetration was evaluated using a stereomicroscope.

Statistical analysis: Duncan's Post hoc analysis and Friedman's test.

Results: Group A showed the highest microleakage followed by Group D, Group C, and Group B.

Conclusion: Polofil NHT Flow seems to be a promising liner for gingivally deep class II cavities.

Background: Dental bleaching is not recommended on teeth with enamel caries.

Aim: The study aimed to assess the efficacy of in-office bleaching on demineralized enamel managed by resin infiltration (RI) as well as casein phosphopeptide-amorphous calcium phosphate (CPP-ACP).

Methodology: Forty-eight sound enamel specimens were divided into four groups based on the surface treatment performed before in-office bleaching. Group I consisted of no caries and no treatment (NT); Group II had artificial caries (AC) and NT; Group III had AC treated with RI, and Group IV had AC remineralized with CPP-ACP. Pre- and postbleaching teeth color and surface topography were evaluated using spectrophotometer and scanning electron microscope (SEM), respectively.

Statistical analysis used: One-way analysis of variance and Tukey's post hoc test were performed for inter-group comparisons.

Results: The color change postbleaching was the least in Group IV; and this was significantly less than Group I (P < 0.05) and Group II (P < 0.001). The bleaching efficiency in Group III was not significantly different from the control group. In addition, the enamel topographic changes were less in the surface-treated group.

Conclusion: RI can be considered a treatment modality for teeth with enamel caries requiring tooth whitening as the bleaching efficiency was like that of sound enamel.

A concomitant complicated crown-root fracture (CCRF) and horizontal root fracture (HRF) is rarely reported in literature. This report proposes a two-staged single-visit treatment to salvage maxillary central incisor with coexisting CCRF and HRF. A female patient with CCRF with additional HRF (AHRF) of maxillary left central incisor was successfully managed with a novel two-staged treatment strategy. Stage 1 included stabilization of AHRF followed by fragment reattachment in Stage 2 of the treatment. At 5 years of followup, clinical examinations revealed no mobility or discoloration of the reattached fragment with satisfactory periodontal condition. Conebeam computed tomography revealed accurate approximation of reattached fragment to the remaining tooth and the HRF showed type II (connective tissue) healing pattern. This case report concludes that two-staged treatment can be performed as an alternative treatment to invasive therapy like extraction.