Restorative Dentistry & Endodontics最新文献

Objectives: This study aimed to evaluate the efficacy of three commercially available desensitizing agents in occluding dentinal tubules, which may help reduce tooth sensitivity following a bleaching treatment.

Methods: Twenty healthy human third molars were utilized in this investigation. The samples were prepared by transversely sectioning 2.5 mm of the crowns to expose the dentin. They were initially treated with 15% ethylenediaminetetraacetic acid gel for 4 minutes, followed by application of Perfect Bleach (VOCO GmbH) bleaching agent (16% carbamide peroxide) for 2 hours. The samples were randomly allocated into four groups (n = 5), each receiving one of the following treatments: group 1: No treatment (control), group 2: treated with UltraEZ (Ultradent Products Inc.,), containing potassium nitrate and sodium fluoride, group 3: treated with Perfect Protect (VOCO GmbH), also containing potassium nitrate and sodium fluoride and group 4: treated with TheraSol Whitening & Sensitive (ABC Kinitron IKE), containing strontium acetate and sodium monofluorophosphate. Subsequently, the specimens were examined using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy to evaluate dentin tubule occlusion.

Results: SEM observations showed no occlusion of dentin tubules in the control group, whereas groups 2 to 4 exhibited significant occlusion. The most effective treatment was Perfect Protect (p < 0.05), while UltraEZ and TheraSol Whitening & Sensitive demonstrated similar effectiveness, with no statistically significant difference between them (p > 0.05).

Conclusions: The tested desensitizing agents effectively occluded dentin tubules to a considerable extent. Differences in their effectiveness were attributed to variations in their formulations.

Objectives: This study aimed to evaluate the influence of adjacent restorative material and interproximal distance on the accuracy of digital impressions of inlay cavities obtained using an intraoral scanner.

Methods: A disto-occlusal inlay cavity was prepared on a mandibular right first molar model, and digital scans were performed using a CEREC Primescan (Dentsply Sirona). The adjacent restorative materials used were Lava (3M ESPE), ENAMIC (VITA Zahnfabrik), Celtra Duo (Dentsply Sirona), and DMAX (DMAX INTERNATIONAL), and the interproximal distances were set to 0.6 mm, 0.8 mm, and 1.0 mm. The obtained scan data were analyzed using GOM Inspect software (GOM GmbH).

Results: Trueness, maximum positive and negative deviations, and precision were significantly influenced by both the adjacent restorative material and the interproximal distance, while their interaction showed a significant effect only on precision. Celtra Duo demonstrated the highest trueness, with mean deviation values decreasing from 7.8 μm at a 0.6 mm interproximal distance to 7.3 μm at 1.0 mm. ENAMIC showed the best precision, presenting mean deviations of 2.6 μm at 0.6 mm, 2.9 μm at 0.8 mm, and 2.4 μm at 1.0 mm. A narrow interproximal distance of 0.6 mm resulted in lower trueness, measured at 8.3 μm, and the highest precision deviation of 3.4 μm. In contrast, an interproximal distance of 1.0 mm yielded improved scan accuracy, with increased trueness and reduced precision variation.

Conclusions: Digital impression accuracy of inlay cavities was influenced by adjacent restorative material and interproximal distance, suggesting clinical consideration is needed in CAD/CAM workflows to optimize restoration fit.

Objectives: This study aimed to evaluate the degree of conversion (DC), immediate enamel bond strength (IEBS), antimicrobial activity, and release of the active principle of a resin-based material (RBM) enriched with the powdered Schinopsis brasiliensis (Braúna) stem antibacterial extract.

Methods: The RBM was enriched with 0, 1.25, 2.5, 5, 10, and 20 wt% powdered Braúna extract. The DC (n = 7) was assessed using micro-Raman spectroscopy. The IEBS (n = 7) was determined through the microshear test until failure, and failure modes were examined under a stereomicroscope. The antimicrobial activity (n = 15) was assessed by quantifying colony-forming units, and the release of the active principle was determined using ultra-high-performance liquid chromatography. One-way analysis of variance/Tukey and Kruskal-Wallis/Dunn tests were utilized to analyze the data (p < 0.05).

Results: Materials with 10 wt% and 20 wt% extract showed the lowest DC statistically. However, for IEBS, there were no statistically significant differences among the different groups. All materials released the active principle, but only those with 20 wt% and 10 wt% extract could inhibit biofilm formation similarly to 0.12% chlorhexidine.

Conclusions: Adding powdered Braúna extract between 10 wt% and 20 wt% is a promising alternative to provide an antimicrobial function to RBMs.

Objectives: This study aimed to evaluate the effect of premixed bioceramic paste (Well-Root PT; Vericom) compared to mineral trioxide aggregate (MTA) on the expression of the mineralization-related marker dentin sialoprotein (DSP) in dental pulp following direct pulp capping, with or without prior diode laser application.

Methods: Direct pulp exposures were performed in the upper and lower incisors of eight dogs (n = 96 teeth). Cavities (Class V) were created and received pulp capping with either Well-Root PT (n = 32), MTA (n = 32), or no capping material (Teflon disc only) (n = 32), with or without the application of a diode laser. Immunohistochemical analysis of DSP expression was conducted and quantified as the mean area percentage using ImageJ software at 2 and 8 weeks posttreatment.

Results: Both the Well-Root PT and MTA groups showed significantly increased DSP expression compared to the control group at both 2 and 8 weeks (p < 0.05). No significant difference in the mean area percentage of DSP expression was found between the Well-Root PT and MTA groups. The diode laser application did not produce a significant effect on DSP expression. Within-group comparison revealed a significant increase in DSP expression between the 2- and 8-week follow-up periods (p < 0.05).

Conclusions: Well-Root PT demonstrated comparable efficacy to MTA in promoting DSP expression, supporting its use as an effective direct pulp capping material. Diode laser application prior to capping had no effect on DSP expression in this experimental model.

Objectives: This study aimed to evaluate the actual parameters of four endodontic motors, each adjusted for reciprocating motion, and compare them to the manufacturers' declared values.

Methods: The motors used were the VDW Silver Reciproc (VDW GmbH), E-Connect Pro (MK Life), Ecom (Woodpecker), and Endopen (Schuster Woodpecker). A custom optical target was attached to the motor contra-angle, the movements were recorded with a high-resolution camera, and the images were analyzed. Engagement, disengagement, net angles, and speed for each operation cycle, duration of clockwise (CW) and counter-clockwise (CCW) movement, duration of standstill after CW and CCW movement, and the number of cycles to complete a full rotation were analyzed. The data were statistically analyzed at a significance level of 5%. The replicability of all reciprocal parameters analyzed was statistically different from that reported by the manufacturers.

Results: There was no statistically significant difference between the VDW Silver Reciproc, Ecom, and Endopen for the engagement angle. The E-Connect Pro was the least reliable at the 150°/30° settings for both angle parameters. There was no significant difference between the set and actual cycle net angles for the VDW Silver Reciproc (p = 0.493). While the actual values for the Ecom and E-Connect Pro were significantly higher than the set (p < 0.001), the actual values for the Endopen were significantly lower than the set (p < 0.001).

Conclusions: Experiments on four commercially available reciprocating endodontic motors revealed that the actual motor values differed significantly from the set values.

This case report presents a lateral maxillary incisor with dens invaginatus (DI) type IIIb that was treated both nonsurgically and surgically over 50 years. Treatment of teeth with DI can be challenging. Suggested options may include nonsurgical root canal treatment, endodontic surgery, or extraction. In this case report, a 13-year-old patient with a lateral maxillary incisor with DI type IIIb was treated by nonsurgical root canal treatment, modern endodontic surgery, and reoperation over the course of 50 years. There was complete healing at the last follow-up, 11 years after the reoperation. Correct diagnosis and proper treatment using modern endodontic techniques can enable teeth with DI to survive throughout the life span of the patient.

Objectives: This study aimed to quantify light attenuation through varying tooth thicknesses and its impact on the depth of cure of composite resin.

Methods: Twenty extracted premolars were used to create enamel-dentin discs that were sanded progressively in 0.5 mm increments from 2.5 mm to 0.5 mm. Light irradiance was measured with and without tooth specimens to evaluate light transmittance. Resin was cured beneath different thicknesses, and the depth of cure was assessed using the Vickers hardness test.

Results: The results demonstrated that light transmittance significantly decreased as tooth thickness increased (p < 0.01), leading to reduced resin polymerization. In the 2.0-mm and 2.5-mm tooth thickness groups, the depth of cure was significantly lower than in the control group without tooth specimens (p < 0.05).

Conclusions: Ultimately, for tooth structures exceeding 2 mm, self-cure or dual-cure resin polymerization is thought to be more efficient than light polymerization.

Objectives: The aim of this systematic review is to compare the effectiveness of advanced platelet concentrates as regenerative endodontic therapeutic alternatives to blood clot (BC) revascularization in immature permanent necrotic teeth.

Methods: Randomized controlled trials (RCTs) comparing regenerative endodontic therapies using platelet-rich plasma (PRP), platelet-rich fibrin (PRF), or platelet pellet (PP) with the BC revascularization approach in immature permanent necrotic teeth were systematically searched in PubMed, Scopus, Cochrane Library, and Web of Science until May 2025. Data was extracted and analyzed both qualitatively and quantitatively. Study quality was assessed using the Cochrane Risk of Bias tool. A meta-analysis was conducted using IBM SPSS software (version 29.0), with success rates expressed as risk ratios and 95% confidence intervals (CIs).

Results: The initial search yielded 4,917 studies. After removing duplicates and applying eligibility criteria, 15 RCTs were included. Meta-analysis indicated no significant difference in the risk ratio (RR), as the BC method has similar success rates with PRP (10 studies; RR = 1.01; 95% CI, 0.94-1.09; p = 0.76) and PRF (8 studies; RR = 0.98; 95% CI, 0.89-1.08; p = 0.65) at 12 months. The primary outcomes evaluated were based on clinical and radiographic success.

Conclusions: Current evidence suggests PRP, PRF, and BC are all effective in treating immature permanent necrotic teeth with similar success rates. However, further research is needed to assess long-term outcomes.

Objectives: This study evaluated the marginal adaptation of ProRoot MTA (Dentsply Tulsa Dental), Biodentine (Septodont), and TotalFill BC RRM (FKG) placed in root-end cavities prepared with ultrasonic or Er,Cr:YSGG laser tips, using scanning electron microscopy.

Methods: The canals of 90 extracted maxillary central incisors were prepared and obturated and their roots resected. Six groups of 15 specimens were allocated as follows: ultrasonic + ProRoot MTA, ultrasonic + Biodentine, ultrasonic + TotalFill, laser + ProRoot MTA, laser + Biodentine, and laser + TotalFill. Roots were sectioned longitudinally to expose the filling material. Apical and coronal micrographs were taken, and the greatest distance between dentin and filling material was measured. The total gap area was also calculated using further micrographs.

Results: Cavities prepared with the ultrasonic tips and filled with Biodentine showed significantly greater gap dimensions compared with TotalFill (p < 0.001) and ProRoot MTA (p = 0.007) in the apical region. The ultrasonic group showed significantly higher void values compared to the laser group for ProRoot MTA (p = 0.026), when comparing the total values of void. The Biodentine group was significantly higher than the TotalFill group in root-end cavities prepared with ultrasonic tips (p < 0.001). The Biodentine group was significantly higher than the ProRoot MTA group in root-end cavities prepared with the laser tip (p = 0.002).

Conclusions: Under the conditions of this study, it was determined that the root-end cavity preparation technique had an effect on the amount of gaps formed between the dentin and the three filling materials.

Objectives: The objective of this study was to evaluate the effects of transformational temperatures on the cyclic fatigue resistance at body temperature of reciprocating file systems: R motion (RM), Procodile Q (PQ), and Reciproc Blue.

Methods: Resistance test was done in a custom-made device at room (20°C ± 1°C) and body (37°C ± 1°C) temperatures within a 60° angle of curvature and 5 mm radius of the artificial canal. The time to fracture (TTF) was recorded. The scanning electron microscope observation and differential scanning calorimetry analyses were performed. Two-way analysis of variance and Tukey post-hoc comparison were applied at a significance level of 0.05.

Results: The results showed a significant influence of temperature on instrumental breakage, regardless of the file systems (p < 0.05). The TTF is significantly decreased at body temperature (p < 0.05). PQ showed the longest TTF in both temperature conditions (p < 0.05). RM demonstrated a significantly higher TTF reduction ratio compared to the other files (p < 0.05).

Conclusions: Within the limitations of this study, the heat-treated files with reciprocating kinetics may have different reduction ratios of the fatigue resistance of the file systems under different temperature conditions. This characteristic is an important point of consideration when clinicians select the file system to reduce potential file fracture.