Microleakage of Restorative Materials Used for Temporization of Endodontic Access Cavities

Assessing correlation between different temporary restorative materials for microleakage following endodontic treatment: an in-vitro study

BACKGROUND

Coronal microleakage, the passage of fluids and bacteria through the interface between the temporary restoration and the tooth structure, can potentially result in endodontic treatment failure.

PURPOSE

This study evaluated and compared the sealing efficacy of various temporary restorative materials utilized during endodontic procedures.

METHODS

All seventy premolar teeth were extracted, measured, and restored, except for the negative control group, where the teeth were left whole. There were eight distinct groupings created from the teeth. Sound teeth were utilized in the n = 5 (Group 1) negative control group. A cavity after endodontic treatment was left vacant in the positive control group (n = 5, Group 2). Six experimental groups, each with ten specimens, had access cavities restored using various temporary materials (Group 3: Cavit-W, Group 4: Systemp. inlay, Group 5: Cotton + Systemp. inlay, Group 6: Cotton + Cavit-W, Group 7: Teflon + Systemp. inlay and Group 8: Teflon + Cavit-W). The teeth were submitted to thermocycling, and a microleakage test was performed. Depth of dye penetration was measured. The collected data were statistically analyzed (α = 0.05).

RESULTS

Gp 7: Teflon + Systemp. inlay obtained the lowest infiltration values with no significant difference than (Gp 4: Systemp.inlay) and (Gp 8: Teflon + Cavit-W). Whereas (Gp 5: Cotton + Systemp.inlay) and (Gp 6: Cotton + Cavit-W) presented the highest significant microleakage values among other experimental groups.

CONCLUSION

Regarding temporization after endodontic treatment, Teflon combined with Systemp.inlay and Cavit-W presented the best temporary materials regarding microleakage control. At the same time, cotton combined with Cavit-W presented the worst temporary material for microleakage control. Cotton is not to be used in the temporization of endodontic-treated teeth.

CLINICAL IMPLICATION

Creating a tight seal in root canals that have undergone endodontic treatment is crucial for a successful, durable final restoration. Clinical and laboratory research results are an essential factor in determining how well endodontic materials seal.

The effect of varying thicknesses of mineral trioxide aggregate (MTA) and Biodentine as apical plugs on the fracture resistance of teeth with simulated open apices: a comparative in vitro study

Background

This study evaluates the fracture resistance of apical plugs created from Biodentine and mineral trioxide aggregate (MTA) in thicknesses of 3 and 5 mm within simulated open apex tooth models.

Methods

Fifty human maxillary central incisors were obtained from a pool of freshly extracted teeth. In order to replicate open apices without cavity preparation, ten teeth in the control group received apical-to-coronal preparation with Peeso reamers. The remaining 40 teeth were randomly assigned to four experimental groups and received either 3 or 5 mm Biodentine or MTA apical plugs.

Results

The mean fracture loads observed in this study were as follows: control group, 431.48 N (±34.55); 3 mm MTA, 774.88 N (±62.74); 5 mm MTA, 752.65 N (±73.79); 3 mm Biodentine, 918.25 N (±59.09); and 5 mm Biodentine, 903.42 N (±24.48). Specifically, teeth in the Biodentine group demonstrated considerably stronger fracture resistance compared to those in the MTA group (p < 0.001). However, no significant differences were observed between the 3 and 5 mm thicknesses (MTA: p = 0.98, Biodentine: p = 0.99), suggesting that plug thickness did not affect fracture resistance within both groups.

Conclusion

Biodentine apical plugs provided the highest fracture resistance among the materials, regardless of thickness.

The effect of preprocedural mouthrinses against COVID-19 before acid etching on the microleakage of a resin-based sealant in permanent molars: An in vitro experimental study

Aim

To determine whether rinsing with preprocedural mouthrinses against coronavirus disease before acid etching affects resin-based sealant microleakage.

Materials and Methods

A presented in vitro experimental study was performed on 15 extracted permanent third molars. Samples were randomly allocated into five groups: Group 1-distilled water (control); Group 2-1% hydrogen peroxide; Group 3-1.5% hydrogen peroxide; Group 4-0.5% povidone-iodine; and Group 5-1% povidone-iodine. After the teeth were immersed in the assigned mouth rinses for 60 s, they were sealed with Concise™ white sealant. Subsequently, the teeth were thermocycled for 500 cycles, immersed in 2% methylene blue solution for 24 h, and sectioned with two parallel cuts in the buccolingual direction. Sixty surfaces (12 surfaces in each group) were examined for microleakage under a 40× light microscope and scored as described by Zyskind et al. Welch's one-way analysis of variance test and the Games-Howell test were used to analyze the results at a significance level of P < 0.05 for all tests.

Results

The intergroup comparisons indicated that the 0.5% povidone-iodine group and the 1% povidone-iodine group had significantly higher microleakage compared with the control group. The 1% and 1.5% hydrogen peroxide groups demonstrated no significant difference in mean microleakage scores compared with the control group. There was no significant difference between the povidone groups and the hydrogen peroxide groups.

Conclusions

Preprocedural rinsing with 0.5% and 1% povidone-iodine before acid etching caused higher microleakage of resin-based sealant, while hydrogen peroxide rinsing gave comparable microleakage compared with the control group.

Temporary Root Canal Obturation with a Calcium Hydroxide-Based Dressing: A Randomized Controlled Clinical Trial

Successful bacterial inactivation or elimination is essential for successful outcomes in endodontics. This study investigated the efficacy of a calcium hydroxide paste (Ca(OH)2) as a temporary medical dressing for 1 week after chemomechanical root canal treatment (CMRCT). Microbiological samples from 26 patients were collected after endodontic emergency treatment as follows: (1) removal of the provisional filling material; (2) CMRCT; (3) irrigation with sodium hypochlorite I (3%); (4) medicinal insertion of Ca(OH)2; and (5) irrigation with sodium hypochlorite II (3%). A microbiological examination was carried out after the specimens had been taken from the root canals via saline and sterile paper points. CMRCT resulted in a significant reduction in total bacterial load (TBL) in the root canal (p < 0.05). Additional irrigation (3) resulted in a further significant reduction in TBL (p < 0.05). In contrast, Ca(OH)2 medication did not prevent the bacterial load from returning to the previous level immediately after CMRCT, but did not increase above that level either (p < 0.05). However, the increase in TBL was significant (p < 0.05) in comparison with the disinfection groups (I/II). Administration of Ca(OH)2 for 1 week shows that in combination with an additional disinfection procedure, an increase in TBL must be expected, but not above the level of conditions after CMRCT.