Journal of Esthetic and Restorative Dentistry最新文献

Objective: This clinical trial aimed to evaluate the influence of a purple repositioning silicone guide on color assessment before and after at-home tooth bleaching.

Materials and methods: Forty-five individuals received 10% carbamide peroxide at-home tooth bleaching using custom trays on both arches, 3 h per day for 2 weeks. Upper canines were evaluated with a spectrophotometer in two different ways: with and without (control) a purple silicone guide. Tooth color was assessed using the CIELab (ΔE*_ab), CIEDE2000 (ΔE₀₀), and the whitening index for dentistry (ΔWI_D) at baseline, 2 and 4 weeks after the beginning of treatment. Data were analyzed using paired t tests for dependent samples (p < 0.05).

Results: At all evaluation periods, the use of the purple silicone guide resulted in lower b* values and higher WI_D values (p < 0.001) compared with the control group. At 2 and 4 weeks, the repositioning guide resulted in lighter teeth (higher values of ΔE*_ab, ΔE₀₀, and ΔWI_D) than the group that did not use the guide (p < 0.04).

Conclusions: The use of a purple repositioning guide with a spectrophotometer influenced the color measurement of upper canines before and after at-home tooth bleaching.

Purpose: To assess the influence of the color and diameter of retraction cords or Teflon tape and intraoral scanner (IOS) technology/system on the accuracy of crown preparations digitized using three IOSs.

Materials and methods: A typodont with a crown preparation with an equigingival finish line was digitized using a laboratory scanner (control). Three groups were created: i700, TRIOS 5, and Aoralscan3. Six subgroups were developed depending on the retraction method: no cord (NC subgroup), purple 00 cord (Knittrax 00; Pascal Dental) (00-K subgroup), yellow-black 00 cord (Ultrapack 00; Ultradent) (00-U subgroup), yellow 02 cord (Knittrax 02) (02-K subgroup), green 02 cord (Ultrapack 02) (02-U subgroup), and Teflon tape (T subgroup) (n = 10). The control scan was used as a reference to measure the root mean square (RMS) error discrepancies with each experimental scan on the preparation and margin areas. Two-way ANOVA and pairwise multiple comparisons tests were used to analyze trueness. Levene and pairwise comparisons tests were used to analyze precision (α = 0.05).

Results: In the preparation area, trueness differences were found among groups (p < 0.001) and subgroups (p < 0.001), with a significant group×subgroup interaction (p < 0.001). The i700 and Aoralscan3 and the 00-U, 02-U, and T subgroups had the best trueness. In the margin area, trueness discrepancies were found among groups (p < 0.001) and subgroups (p < 0.001). The Aoralscan3 and 02-U and T subgroups demonstrated the best trueness. Finally, precision discrepancies were found only in the preparation area among groups (p < 0.001) and subgroups (p < 0.001). The i700 and Aoralscan 3 groups and 02-U and T subgroups had the best precision.

Conclusions: The IOS and retraction technique tested influenced the trueness and precision of the single tooth preparation cast.

Clinical significance: The color and diameter of the retraction cord or Teflon tape used as the first cord in the double cord technique for digitizing a crown preparation with equigingival finish line did impact the scanning accuracy of the IOSs tested. However, the scanning discrepancies measured are not clinically relevant.

Objective: This umbrella review synthesized high-level evidence on the clinical longevity and failure patterns of direct restorative materials, including conventional composites, bulk-fill resins, ormocer-based composites, and glass ionomer cements (GIC/RMGIC) used in posterior restorations and non-carious cervical lesions (NCCLs).

Materials and methods: Sixteen systematic reviews and meta-analyses published between 2012 and 2025 were included, representing over 15,000 restorations with follow-up periods ranging from 6 to 120 months. Methodological quality was assessed using AMSTAR 2, and evidence certainty was graded with the GRADE framework. Outcomes included survival rates, failure types, and comparative risk estimates (RR, OR).

Results: Conventional composites demonstrated > 90% 5-year survival, especially with multi-step adhesives. Bulk-fill resins showed similar short-medium-term outcomes (failure rates < 7%), but long-term data remain limited. Ormocer-based composites had significantly higher failure rates (12.1%), primarily due to marginal degradation. GICs exhibited lower survival but remain useful in high caries risk or moisture challenged conditions. The sandwich technique with RMGIC bases improved retention in NCCLs. Adhesive protocol emerged as a key prognostic factor across all materials.

Conclusions: Clinical longevity is influenced by material class, bonding strategy, and patient risk profile. Conventional and bulk-fill composites remain the most reliable options. RMGICs and sandwich approaches are effective in specific indications.

Clinical significance: This umbrella review provides clinicians with consolidated, high-level evidence to optimize restorative decisions. The integration of AMSTAR 2 and GRADE strengthens the clinical applicability of findings.

Objective: To evaluate whether teeth prepared for overlay restoration, as well as their antagonist or adjacent teeth, undergo positional changes between tooth preparation and final cementation appointments, with or without the use of a temporary restoration.

Materials and methods: Fifty teeth (maxillary and mandibular molars and premolars) requiring overlay restorations were prepared and randomly assigned to 2 groups, according to whether a temporary restoration (Telio, Ivoclar Vivadent) was placed during the interval between appointments or not. Digital scans (Trios3) were obtained at the first appointment, immediately after tooth preparation (T0), and at the second appointment, before cementation (T1). The T0 and T1 .STL files were superimposed (Geomagic), and linear displacements of the abutment tooth (AB), its antagonist (AN), and the adjacent tooth (AD) were measured, providing a quantitative assessment of positional changes. Maximum tooth movement distances were statistically analyzed (p < 0.05).

Results: The factor "tooth position" significantly influenced maximum tooth movement distance (p < 0.0001). Specifically, AB demonstrated greater positional changes compared to AN (p < 0.0001) and AD (p < 0.0001). Moreover, the placement of a temporary restoration significantly reduced the extent of tooth movement in maxillary molars (p = 0.002) but not in other investigated tooth classes (p > 0.05).

Conclusions: Omission of a temporary restoration during the interval between tooth preparation and overlay cementation may increase the risk of tooth positional changes for specific tooth classes.

Objective: To map laboratory/clinical evidence on self-adhesive flowable resin composites (SAFRCs), tracing their chemical evolution, performance, and behavior, and to identify gaps that must be addressed to drive their optimization.

Overview: A comprehensive literature search was performed in PubMed/MEDLINE, Scopus, and LILACS without language restrictions. To date, 11 commercial SAFRCs are available. These contain 5wt%-10 wt% hydrophilic monomers and ≤ 55 vol% fillers, as a flowable option, although susceptible to water sorption and color changes. Functional monomer trends shift from 4-META/GPDM to 10-MDP or phosphate-amide hybrids; meta-analytical and recent laboratory data confirm that μTBS to dentin is extremely low (rarely > 10 MPa). Inefficacy to bond/seal is the main reason for failure. Clinical evidence is scarce and short-term: RCTs suggest that small Class-I restorations survive comparably to controls at ≤ 24 months, but failures are frequent. Emerging strategies such as alternative conditioning, collagen depletion, or incorporation of bio-interactive fillers may improve outcomes.

Conclusions: Current SAFRCs simplify placement and reduce technique sensitivity but are constrained by very low bond strengths, poor sealing, and high hygroscopicity. Until chemistry, paste acidity, and smear-layer interaction are co-optimized, their use should remain limited. Future research must couple novel chemical formulations and low-water-uptake matrices while validating performance in adequately powered RCTs.

Objectives: To describe the clinical implementation of a staged approach using strategically selected abutment teeth, a cobalt-chromium-reinforced long-span provisional prosthesis, and a fully digital workflow for maxillary FP-2 full-arch rehabilitation.

Overview: A 48-year-old male with advanced periodontal disease underwent a staged full-arch implant rehabilitation. Maxillary canines and first molars were preserved to support a long-span fixed provisional prosthesis. A fully digital workflow was employed, including CBCT, intraoral scanning, and photogrammetry. A cobalt-chromium framework reinforced the provisional prosthesis, enhancing strength and stability during the healing period. Following soft tissue maturation, a definitive zirconia prosthesis was digitally designed and delivered with minimal adjustment.

Conclusion: This case highlights the value of a strategically staged approach that preserves key abutment teeth and incorporates a robust digital workflow. The method enabled precise implant placement, improved prosthetic predictability, and optimized esthetic and functional outcomes.

Objective: This study aimed to evaluate the impact of filling techniques (bulk filling and incremental filling) on adhesive damage by finite element analysis using a cohesive zone model.

Methods: A mandibular first premolar with a Class V cavity and its periodontal tissues were established. Tooth models were restored with different filling techniques: single increment filling (Bulk) as the control group, parallel incremental filling (PI), oblique incremental filling with the first layer placed on the incisal surface (OII), and oblique incremental filling with the first layer placed on the gingival surface (OIG). The adhesive damage at the cavity-restoration interface was represented by a cohesive zone model. Polymerization shrinkage was simulated to induce shrinkage pre-stress, followed by occlusal forces.

Results: Under polymerization shrinkage, incremental filling techniques could effectively mitigate the expansion of the damage area but cannot reduce the damage extent. Incremental filling techniques could effectively alleviate the incremental damage caused by occlusion compared to the Bulk technique, especially the OIG technique. The PI technique exhibited the lowest adhesive damage extent and smallest range under coupled loading.

Conclusion: OIG technique was found to be effective in resisting adhesive damage from occlusal forces, while PI technique was recommended as the optimal method to resist adhesive damage from coupled loading.

Objectives: To systematically evaluate the fracture resistance, failure patterns, and clinical performance of SFRC-based restorations in posterior teeth, based on evidence from in vitro and clinical studies.

Materials and methods: A systematic review was performed following PRISMA 2020 and registered in PROSPERO. Searches were conducted in five databases and gray literature sources up to July 2025. In vitro and clinical studies on SFRC restorations in posterior teeth were included. Risk of bias was assessed with RoBDEMAT and RoB 2.0/JBI tools. Due to heterogeneity, a narrative synthesis was undertaken.

Results: Twenty-eight studies met the inclusion criteria (23 in vitro, 5 clinical). In vitro studies consistently showed that restorations incorporating short fiber-reinforced composites (SFRCs) achieved higher fracture resistance and a greater proportion of repairable failures compared with conventional composites, particularly in large MOD cavities and endodontically treated teeth. Clinical studies, with follow-up periods of up to 4 years, confirmed favorable survival rates and satisfactory marginal adaptation, although no clear superiority over conventional composites was demonstrated.

Conclusions: Short fiber-reinforced composites (SFRCs) show promising improvements in fracture resistance and failure behavior, but current clinical evidence is limited and of low certainty. Their routine use should remain cautious until validated by long-term randomized trials.

Clinical relevance: Short fiber-reinforced composites (SFRCs) have shown potential to improve fracture resistance and promote more favorable failure patterns in posterior restorations. While current evidence is promising, further clinical validation is needed before their routine use can be widely recommended.

Background: The integration of thermal imaging with artificial intelligence (AI) offers a novel, non-invasive approach for assessing gingival inflammation. While thermal imaging has been widely applied in other medical fields, its use in evaluating gingival health remains largely unexplored. This study is the first to utilize AI-supported analysis of thermal gingival images in patients with mouth breathing habits, aiming to detect and classify gingival inflammation severity. This research establishes specific thermal thresholds for gingival health and disease in this unique population.

Methods: Forty participants were included, stratified according to periodontal status and clinically confirmed breathing pattern (mouth or nasal breathing), under standardized imaging conditions. From these participants, 160 images were annotated, producing 1734 labeled data points categorized according to bleeding on probing (BoP) for diagnosis, with Gingival Index (GI) applied only for secondary stratification of inflammation severity. Preprocessing included image resizing, outlier removal, and calculation of mean RGB values. The XGBoost algorithm was used for classification, with hyperparameters optimized via grid search and 5-fold cross-validation to ensure robust model performance.

Results: The XGBoost Achieved Outstanding Classification Results, With an Accuracy of 92.74%, Precision of 92.95%, Sensitivity of 92.74%, and an F1 Score of 92.78%. Cross-Validation Confirmed the Model's Reliability, With Mean-Test and Validation-Scores of 88.28% and 89.43%, Respectively.

Conclusions: This study represents the first application of AI-supported thermal imaging for evaluating gingival inflammation in mouth breathers, marking a significant step forward in periodontal diagnostics. By establishing specific thermal thresholds in this unique population, it highlights the potential of this innovative approach as a non-invasive, real-time, and scalable diagnostic tool. Future research should focus on refining AI algorithms and expanding datasets to enhance clinical applicability, paving the way for advanced diagnostics and personalized care in periodontology.