European Journal of Prosthodontics and Restorative Dentistry最新文献

Introduction: The accuracy of intra-oral scanners (IOS) has not been thoroughly evaluated across all clinical scenarios, particularly in crown preparations with subgingival margins.

Objectives: This systematic review aims to assess the accuracy of IOS in tooth preparations with subgingival margins and identify factors influencing their performance in these situations.

Methods: A comprehensive literature search was conducted in databases including PubMed, Scopus, Embase, Medline, Google Scholar, and Web of Science for studies published in the last five years. Quality Assessment Tool for In-Vitro Studies (QUIN) was used to evaluate study quality.

Results: Out of 605 studies, seven met the inclusion and exclusion criteria. The review found that the trueness of IOS is significantly compromised in subgingival margins, often failing to achieve clinically acceptable results. Influencing factors included gingival retraction and saliva contamination. Specifically, cord retraction enhanced IOS accuracy, while saliva contamination reduced it.

Conclusions: The accuracy of IOS in crown preparations with subgingival margins is severely affected by saliva contamination and visibility issues. Clinically acceptable results are achieved with proper gingival retraction and a dry field.

Clinical relevance: To ensure accurate scanning for tooth preparations with subgingival margins, achieving proper gingival retraction and dryness is crucial.

Objectives: Digital impressions using intraoral scanners (IOS) are replacing conventional impressions, requiring a learning process. This study compared the learning curves of 29 dentists with no prior IOS experience, randomly assigned to groups: Eagle, Omnicam- AF, and IS-3700.

Methods: After a lecture, participants performed three full scans (maxilla, mandible, and occlusion record) on a phantom and completed a survey about their experience. Scanning times to achieve adequate scans were recorded, and Wright's model was used to estimate the number of trials required for proficiency. Statistical analyses used Kruskal-Wallis and Chi-Square tests.

Results: Proficiency was achieved after 10 trials with Eagle and 11 trials with Omnicam-AF and IS-3700. Participants using IS- 3700 reached the plateau faster (167.9 s) than those using Eagle (245.5 s, P=0.041) and Omnicam-AF (260.6 s, P=0.014). While all groups appreciated the time-saving benefits over conventional impressions, 60-70% identified the need for further training.

Conclusion: Despite similar trials required for proficiency, differences in average scanning times suggest that IOS characteristics may influence learning efficiency and user perceptions.

Clinical relevance: Understanding learning curves and device-specific performance can help optimize IOS training programs and guide clinicians in adopting digital workflows effectively.

Introduction: Molar-incisor hypomineralization (MIH) is a qualitative defect of the enamel structure affecting at least one of the first permanent molars. Treatment will depend on its severity, the stage of dental development and the cooperation of the young patient. The aim of this study is to compare the different materials used for direct restorations on teeth with MIH.

Methods: A systematic review was conducted on May 2024 and is described according to the PRISMA criteria. It was performed on three databases (PubMed, Science Direct, and Google Scholar). Twenty-nine articles were included.

Results: 14 studies (48.3%) described the use of glass-ionomer cement (GIC), among which 12 concluded that its use could be recommended as a temporary material in the presence of MIH, protecting the tooth while awaiting a definitive restoration. Composite resins were described in 21 studies (72.4%), in association with both etch-and-rinse and selfetch adhesive systems.

Conclusions: For direct tooth restoration in case of MIH, GIC seem to meet the objective of preserving the child's quality of life by protecting teeth during their eruption with an acceptable survival rate. The use of dental composite resins is more restrictive and will be optimal with complete removal of hypomineralized tissue.

Objective: To perform a systematic review of in vitro studies examining endodontically treated anterior teeth restored with fiberglass posts versus composite posts reinforced with: polyethylene fibers (Ribbond), fiber-reinforced resin (everStick) and composite resin (everX).

Methods: The search was performed using PubMed, Scopus, Web of Science and LILACS. The studies were selected by two independent reviewers. To assess the risk of bias of each study, the QUIN tool was used. We analyzed the data using a narrative synthesis.

Results: Five articles were retained for final analysis. The risk of bias was moderate to high. Most studies reported non-catastrophic failures. With 72 non-catastrophic failures for the glass fiber group and 60 for the fiber-reinforced resins. Catastrophic failures were more prevalent in fiber-reinforced composite, especially in the Ribbond-treated group.

Conclusion: Within the limitations of this study, the use of fiberreinforced composites as custom intracanal posts is still questionable, with controversial results. It is not possible to establish the superiority of one approach over the other in endodontically treated anterior teeth without ferrule.

Clinical relevance: It was not possible to identify a superior performance among the approaches analyzed for the restoration of endodontically treated anterior teeth without ferrule.

This systematic review gathered evidence to identify the influence of roughness on titanium surfaces on the adhesion of hydroxyapatite coatings. This research followed the PRISMA guidelines and was registered on the Open Science Framework (osf.io/cxrsf). In vitro studies were searched on Science Direct, PubMed, Embase, Scopus, Google Scholar and in the references of the articles included. Two independent reviewers selected the studies based on the inclusion and exclusion criteria. The risk of bias analysis was carried out using the adapted Joanna Briggs Institute quasi-experimental study tool. 2890 articles were found and after applying the selection criteria 22 were chosen to be read in full. 9 studies were excluded because they did not evaluate substrate roughness or coating adhesion. Finally, 13 studies composed this systematic review. Of these, 4 indicated that greater titanium roughness provides better adhesion of the hydroxyapatite coating, 7 that in addition to roughness, other factors play a role in this process, and 2 other studies presented divergent results. Surface roughness has influence on the adhesion of hydroxyapatite coatings to titanium. However, the type of titanium alloy, the thickness of the coating and other characteristics also affect the adhesion process and should be considered.

Introduction: It is unclear the number of times a screwdriver may be reused without loosening its efficacy or inducing damage to implant screws while keeping appropriate torque values.

Objective: Evaluate the effect of the screwdriver and internal threads on the tightening efficacy by assessing the reverse torque value (RTV).

Methods: The efficacy was tested with four groups of screws: two titanium groups and two gold-platted (n=5). Each screw was tightened 10 times at 20 Ncm using the screwdriver attached to ISD900 (NSK®). In the first protocol one implant was used for the five screws. In the second protocol for each screw a new implant was used. At each untightening, the RTV was measured and recorded.

Results: RTVs for Gold were statistically lower compared to the Titanium. The RTVs differed among the tested screws. In the first protocol, the first serie tightening/untightening differed statistically from the last three series.

Conclusion: Titanium screws from Zimmer Biomet achieve better RTV than gold-platted. By increasing the number cycles it is expected to have a decrease in the RTV. The extensive use of screwdrivers and the internal threads of the dental implants might be factors influencing the loss of RTV.

Objectives: To report one-year outcomes of prosthetic rehabilitation of the atrophic maxillae, supported by angled abutments on zygomatic implants and conventional implants.

Methods: In the present retrospective analysis, edentulous maxillary areas treated with fixed-hybrid prostheses supported by angled abutments of 45, 52.5, and 60 degrees screwed to zygomatic implants inserted using an extrasinus surgical approach were included. Prosthesis, implant, and abutment success/survival rates, complications, Mucosal Seal Efficacy Evaluation (MSEE), modified PLaque Index (mPLI), modified Bleeding Index (mBI), and Zygomatic Implants Classification Level (ZICL) were assessed.

Results: Ninety-eight straight implants and 81 zygomatic implants (21 abutments of 45 degrees, 23 of 52.5 degrees, and 37 of 60 degrees) were inserted into 35 patients. Biological complications: postoperative sinus opacity was observed in seven patients, two of whom experienced a unilateral perforation of the sinus membrane. ZICL0-1 was recorded in 95% of zygomatic sites; the cumulative success rates were 100% and 94.3% when using the implant and prosthesis as units of analysis, respectively.

Conclusion: Survival rate for the implants attested to the highest percentage (100%), whereas survival rate of the prostheses was 94.3%. No differences were registered among the clinical indices related to different inclinations of the abutments.

Aim: To compare the tensile strength, dislodgement forces, marginal gap and failure types between digitally fabricated zirconia root copings and conventionally manufactured cast gold root copings.

Methods: Extracted human teeth (N=30) were prepared for the root copings and randomly divided into 2 groups: (1)zirconia root copings(ZC) and gold root copings(GC). The specimens were tested for tensile bond strength and dislodgement forces in a universal testing machine and the types of the coping failures modes were analyzed. In addition, the marginal gap was measured. Data were analyzed using one-way ANOVA and Pearson correlation test.

Results: Mean tensile bond strength in the total horizontal adhesive area for ZC group was 7.5±2.8MPa and for GC group 10.5±4.8 MPa(p⟩0.05). The mean dislodgement forces for the ZC and GC groups were 242±107N and 311±118N, respectively and with no significant differences between the groups (p=0.12). The mean vertical marginal gap in the ZC group amounted to 27±11.05μm, while in the GC group it was 35.33±10.49μm, showing no statistically significant difference between the two groups (p=0.058). Mixed failure modes were more common (93%) in both groups.

Conclusions: In terms of all tested parameters, the zirconia root copings were comparable to the gold copings.

I would like to greet you all as the incoming Editor-in-Chief of the European Journal of Prosthodontics and Restorative Dentistry (EJPRD) which has a history of over 60 years. Back in 1965, the journal was initially named 'Journal (Anglo-Continental Dental Society)' which was published semi-annually by the same society. In 1984, A.E. Morgan Publications started publishing the journal as 'Restorative Dentistry' associated with the British Society for Restorative Dentistry (inaugurated 1968). In 1992, the journal was renamed as "European Journal of Prosthodontics and Restorative Dentistry" and became a new peer-reviewed medical journal under the leadership of the founding Editorin- Chief, Prof. Paul S. Wright, published by Mosby-Year Book Europe Ltd., which was already then abstracted and indexed in MEDLINE/Pubmed. In 2012, and until now, the publisher became Stephen Hancocks Ltd. in association with Dennis Barber Ltd. Later in 2021, Editor-in chief, Prof. Will Palin, who served between 2015-2024, together with the publisher Dennis Barber Ltd., took the journal online and also helped the journal gain an impact factor.

Objectives: Using computer-aided design and manufacturing (CAD-CAM) technology in restorative dentistry increased the application of lithium disilicate (LD) materials. The bond strength to core and repairing materials is crucial in the restoration's longevity. This systematic review evaluates the shear bond strength (SBS) of CAD-CAM-LD restorative materials to other materials using different surface treatments.

Methods: An electronic literature search was performed through PubMed/Medline, Embase, Web of Science, Scopus, and Google Scholar. Studies were selected based on specific criteria. The risk of bias was assessed using the Joanna Briggs Institute Critical Appraisal Checklist for Quasi-Experimental Studies.

Results: Eleven studies were included, primarily investigating composite resin as the repair material. SBS values ranged from 0.82 to 32.96MPa, with the highest values observed for IPS e.max-CAD subjected to silicon carbide polishing, hydrofluoric acid (HF) etching, and silane application. For core materials, the highest SBS was reported for HFtreated IPS e.max-CAD bonded to tribochemically coated titanium and air-abraded zirconia, with SBS values ranging from 5.88 to 34MPa.

Conclusions: This review indicates that HF etching combined with silane application is the most effective method for improving bond strength in CAD/CAM-LD restorations. Applying surface treatments to both the core material and CAD/CAM-LD can further enhance bond strength.