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The Journal of Prosthetic Dentistry Jan 2021Unsatisfactory adaptation of restorations with subgingival margins can cause problems such as accumulation of biofilm, secondary caries, and inflammation of the... (Meta-Analysis)
Meta-Analysis
STATEMENT OF PROBLEM
Unsatisfactory adaptation of restorations with subgingival margins can cause problems such as accumulation of biofilm, secondary caries, and inflammation of the periodontal tissue. Therefore, special attention should be given to gingival displacement and impression procedures to optimize marginal fit.
PURPOSE
The purpose of this systematic review and meta-analysis was to compare gingival displacement with conventional cords and cordless techniques and determine the reliability of the measurement methodologies.
MATERIAL AND METHODS
This study followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement and identified studies through September 2018. The studies were submitted to the Cochrane risk-of-bias assessment. The gingival displacement was evaluated by using the Review Manager Software.
RESULTS
Nine studies were selected, and the most common risks of bias were random sequence generation, blinding of outcome assessment, and absence of sample size calculation. Most of the studies reported obtaining a width greater than 0.2 mm.
CONCLUSIONS
The cord technique resulted in increased displacement when compared with the cordless technique. The evaluation of sulcular width with digital microscope images obtained from sectioned gypsum casts is an adequate and versatile experimental methodology for measuring displacement.
Topics: Gingiva; Gingival Retraction Techniques; Humans; Reproducibility of Results
PubMed: 32008797
DOI: 10.1016/j.prosdent.2019.09.009 -
Heliyon May 2024The objective of the systematic review is to find an answer to a question: "What is the influence of the building direction of titanium implants produced by additive... (Review)
Review
The objective of the systematic review is to find an answer to a question: "What is the influence of the building direction of titanium implants produced by additive manufacturing on their physical and mechanical properties?" This review followed the Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA 2020) and was registered in the Open Science Framework (OSF) (osf.io/rdc84). Searches were performed in PubMed, Scopus, Science Direct, Embase, and Google Scholar databases on February 17th, 2024. Articles were chosen in 2 steps by 2 blinded reviewers based on previously selected inclusion criteria: In vitro studies that evaluated the influence of the impression direction of titanium implants produced by additive manufacturing on their physical and mechanical properties were selected. Articles were excluded that (1) did not use additive technology to obtain the implants, 2) used surfaces other than titanium, 3) did not evaluate the direction of impression, 4) Studies with only in vivo analyses, clinical studies, systematic reviews, book chapters, short communications, conference abstracts, case reports, and personal opinions.). In the initial search, 581 results were found. Of this total, 108 were excluded for duplication and, after applying the eligibility criteria, 16 articles were included in the present review. The risk of bias was analyzed using the RoBDEMAT. The risk of bias was analyzed using the RoBDEMAT. In addition, the coefficient of interagreement of the reviewers (Cohen's Kappa) and the certainty of evidence by GRADE were analyzed. In general, different impression angles showed variations in the physical and mechanical characteristics of the groups evaluated, including roughness, tensile strength, hardness, and modulus of elasticity. While some impression orientations resulted in greater strength or hardness, others showed greater elasticity or lower surface roughness. These findings suggest that print orientation plays a significant role in determining material properties. It can be concluded that printing directions influence the physical and mechanical properties of titanium implants and the studies included showed that the 0°, 45°, and 90° directions are the most evaluated as they present lower probabilities of structural anisotropies and provide better results in their roughness, hardness, tensile and compressive strength.
PubMed: 38774089
DOI: 10.1016/j.heliyon.2024.e30108 -
The International Journal of... 2022To evaluate the accuracy of virtual static articulation and to determine factors that affect its accuracy.
PURPOSE
To evaluate the accuracy of virtual static articulation and to determine factors that affect its accuracy.
MATERIALS AND METHODS
An electronic search up to December 21, 2020 was carried out in the PubMed, Cochrane, and EMBASE databases, and further searching was performed in the references of the evaluated articles. Studies were included if they were published in a peer-reviewed journal in English, were a clinical or laboratory study assessing only static virtual articulation accuracy without making computer-aided manufacturing restorations, used intraoral scanner (IOS) or extraoral scanner (EOS) systems, and evaluated tooth or implant cases.
RESULTS
After applying the inclusion criteria, a total of 28 studies were analyzed. Nine were clinical, and 19 were laboratory. Most of the studies indicated that virtual static articulation had a comparable accuracy to conventional methods in the presence of completely dentate arches, stable occlusal contacts, a single prepared tooth, or arches involving a single missing posterior tooth. The factors that appeared to influence the accuracy were the articulation technique, number, dimension, and location of virtual interocclusal records (VIRs), the length of articulated scans, and the position and size of edentulous areas.
CONCLUSION
Though conclusions were derived mainly from laboratory studies, static VIR had an acceptable accuracy in the presence of certain situations.
Topics: Humans; Imaging, Three-Dimensional; Computer-Aided Design; Mouth, Edentulous; Dental Impression Technique
PubMed: 35349610
DOI: 10.11607/ijp.7407 -
International Journal of Implant... May 2024The purpose of this systematic review was to explore and identify the factors that influence the accuracy of intraoral scanning in implant dentistry, with a specific... (Review)
Review
PURPOSE
The purpose of this systematic review was to explore and identify the factors that influence the accuracy of intraoral scanning in implant dentistry, with a specific focus on scan bodies (ISBs).
METHODS
Following the PRISMA 2020 guidelines, this study conducted a thorough electronic search across MedLine, PubMed, and Scopus to identify relevant studies. Articles were screened based on titles, abstracts, and full texts for relevance. The Robins I tool assessed the risk of bias in various study types. Data extraction occurred based on predetermined parameters for studying specimens and assessing outcomes.
RESULTS
16 studies met the specified criteria and were consequently included in the systematic review. Due to variations in variables and methods across the selected studies, statistical comparison of results was not feasible. Therefore, a descriptive review approach was chosen, acknowledging the substantial heterogeneity in the reviewed literature.
CONCLUSIONS
The precision of virtual scan results is contingent upon diverse characteristics of ISBs and implants. These factors encompass their placement within the dental arch, structural design, shape, material composition, color, and the manufacturing system, all of which contribute to scan accuracy. Additionally, considerations such as the intraoral scanner (IOS) type, scanning technique, use of scan aids, inter-implant distance, scan span, and the number of implants warrant evaluation. In the context of capturing implant positions, intraoral scanning with ISBs demonstrates comparable accuracy to traditional impression methods, particularly in single and short-span scenarios. However, the existing data lacks sufficient information on in vivo applications to formulate clinical recommendations.
Topics: Humans; Dental Implants; Imaging, Three-Dimensional; Computer-Aided Design; Dental Implantation, Endosseous; Dental Prosthesis Design
PubMed: 38691258
DOI: 10.1186/s40729-024-00543-0 -
The Journal of Prosthetic Dentistry Jun 2023The best method of optimizing the accuracy of complete arch intraoral digital scans is still unclear. For instance, the location of the scan bodies can be significantly... (Review)
Review
STATEMENT OF PROBLEM
The best method of optimizing the accuracy of complete arch intraoral digital scans is still unclear. For instance, the location of the scan bodies can be significantly distorted with respect to their actual positions, which would lead to a nonpassive fit of the definitive prosthesis.
PURPOSE
The purpose of this systematic review was to analyze available techniques for improving the accuracy of digital scans in implant-supported complete arch fixed prostheses.
MATERIAL AND METHODS
Three databases (Medline, Embase, and Google Scholar) were searched, and the results obtained were supplemented by a hand search. Specific descriptors identified techniques whose objective were to increase the accuracy of digital scans in implant-supported complete arch fixed prostheses. Titles and abstracts were screened by 2 independent reviewers, and unclear results were discussed with a third independent reviewer. A qualitative analysis based on procedural parameters was used. The interexaminer agreements of both were assessed by the Cohen kappa statistic, and the Risk of Bias Tool was used to assess the risk of bias across the studies.
RESULTS
A total of 17 techniques matching the inclusion criteria were evaluated. Higher accuracy but also differences regarding the need for supplementary devices, number of intraoral scans, and time consumption of clinical and software program steps were observed compared with the conventional digital scanning protocol. The use of a splinting device was common to most of the studies. The outcome variables for the evaluation of the effectiveness of these protocols were heterogeneous.
CONCLUSIONS
The use of additional techniques during intraoral scanning can improve accuracy in implant-supported complete arch fixed prostheses. However, higher complexity for those procedures should be expected.
Topics: Dental Implants; Dental Impression Technique; Computer-Aided Design; Models, Dental; Prosthesis Implantation; Imaging, Three-Dimensional
PubMed: 34756427
DOI: 10.1016/j.prosdent.2021.08.018 -
Journal of Dentistry Nov 2023To review the factors that influence the accuracy of the maxillomandibular relationship at maximum intercuspation (MIP) acquired by using intraoral scanners (IOSs).
OBJECTIVE
To review the factors that influence the accuracy of the maxillomandibular relationship at maximum intercuspation (MIP) acquired by using intraoral scanners (IOSs).
MATERIAL AND METHODS
A systematic search was performed using five databases: MEDLINE/PubMed, Cochrane, Embase, World of Science, and Scopus. A manual search was also completed. Studies assessing the factors that influence the MIP acquired by using IOSs were included and organized based on the analyzed factor. Studies were evaluated by applying the Joanna Briggs Institute Critical Appraisal Checklist.
RESULTS
Twenty-nine articles were included. Seven factors have been identified: IOS system, scan extension, edentulous areas, number, location, and extension of occlusal records, occlusal force, tooth mobility, and alignment methods. Nine studies evaluated the influence of IOS system. Four studies assessed the influence of the extension of the arch scan. Three studies evaluated the effect of edentulous spaces. Four studies agreed on the impact of the number, location, and extension of the occlusal records on the MIP accuracy. One study assessed the influence of the occlusal force, showing a smaller average interocclusal space with increased occlusal force. One study evaluated the influence of tooth mobility. Seven studies analyzed the influence of the alignment method on the MIP accuracy.
CONCLUSIONS
Most of the studies reported no difference on the MIP accuracy between half- and complete-arch scans. Areas with 2 or more missing teeth reduce the MIP accuracy. A bilateral and frontal record including 2 teeth or a bilateral posterior occlusal including at least 4-teeth is indicated for maximizing the MIP accuracy.
CLINICAL IMPLICATIONS
When a complete-arch intraoral scans is obtained, a bilateral and frontal record including 2 teeth or a bilateral posterior occlusal record including at least 4-teeth is recommended for maximizing the accuracy of the MIP. When a half-arch intraoral scan is acquired, a posterior occlusal record including at least 4-teeth is indicated for optimizing the accuracy of the MIP.
Topics: Humans; Imaging, Three-Dimensional; Tooth Mobility; Dental Impression Technique; Models, Dental; Dental Arch; Mouth, Edentulous; Computer-Aided Design
PubMed: 37775027
DOI: 10.1016/j.jdent.2023.104718 -
Clinical Oral Implants Research Oct 2018Working Group 5 was assigned the task to review the current knowledge in the area of digital technologies. Focused questions on accuracy of linear measurements when...
OBJECTIVES
Working Group 5 was assigned the task to review the current knowledge in the area of digital technologies. Focused questions on accuracy of linear measurements when using CBCT, digital vs. conventional implant planning, using digital vs. conventional impressions and assessing the accuracy of static computer-aided implant surgery (s-CAIS) and patient-related outcome measurements when using s-CAIS were addressed.
MATERIALS AND METHODS
The literature was systematically searched, and in total, 232 articles were selected and critically reviewed following PRISMA guidelines. Four systematic reviews were produced in the four subject areas and amply discussed in the group. After emendation, they were presented to the plenary where after further modification, they were accepted.
RESULTS
Static computer-aided surgery (s-CAIS), in terms of pain & discomfort, economics and intraoperative complications, is beneficial compared with conventional implant surgery. When using s-CAIS in partially edentulous cases, a higher level of accuracy can be achieved when compared to fully edentulous cases. When using an intraoral scanner in edentulous cases, the results are dependent on the protocol that has been followed. The accuracy of measurements on CBCT scans is software dependent.
CONCLUSIONS
Because the precision intraoral scans and of measurements on CBCT scans and is not high enough to allow for the required accuracy, s-CAIS should be considered as an additional tool for comprehensive diagnosis, treatment planning, and surgical procedures. Flapless s-CAIS can lead to implant placement outside of the zone of keratinized mucosa and thus must be executed with utmost care.
Topics: Computer-Aided Design; Cone-Beam Computed Tomography; Consensus; Databases, Factual; Dental Implantation, Endosseous; Dental Impression Technique; Dental Prosthesis, Implant-Supported; Humans; Imaging, Three-Dimensional; Mouth, Edentulous; Patient Care Planning; Patient Reported Outcome Measures; Reproducibility of Results; Software; Surgery, Computer-Assisted
PubMed: 30328201
DOI: 10.1111/clr.13309 -
Clinical Implant Dentistry and Related... Mar 2024The present study aimed to systematically review the studies comparing the accuracy of intraoral scan (IOS) and conventional implant impressions (CI) in completely... (Review)
Review
OBJECTIVES
The present study aimed to systematically review the studies comparing the accuracy of intraoral scan (IOS) and conventional implant impressions (CI) in completely edentulous patients.
MATERIALS AND METHODS
Electronic searches were performed in PubMed, Embase and Cochrane CENTRAL up to December 1, 2023. Clinical studies and in vitro studies reporting the accuracy of digital full arch impressions were included. The primary outcome is the 3-dimensional deviations between the study reference models. A risk of bias assessment was performed for clinical studies. A stratified meta-analysis and a single-armed meta-analysis were conducted.
RESULTS
A total of 49 studies were included, with 8 clinical studies and 41 in vitro studies. For comparison between IOS and conventional impressions, studies were categorized into two groups based on the different measurement methods employed: RMS and CMM. In studies using RMS, the result favored the IOS in the unparalleled situation with the mean difference of -99.29 μm (95% CI: [-141.38, -57.19], I = 81%), while the result was opposite with the mean difference of 13.62 μm (95% CI: [10.97, 16.28], I = 26%) when implants were paralleled. For different brands of IOS, the accuracy ranged from 76.11 μm (95% CI: [42.36, 109.86]) to 158.63 μm (95% CI: [-14.68, 331.93]).
CONCLUSIONS
Accuracy of intraoral scan is clinically acceptable in edentulous arches, especially for unparalleled implants. More clinical studies are needed to verify the present finding.
PubMed: 38517307
DOI: 10.1111/cid.13321 -
The European Journal of Prosthodontics... Feb 2024Additive manufacturing is a tool with potential use in medicine and dentistry. The manufacture of metals and composites is already advanced, however, concerns about...
INTRODUCTION
Additive manufacturing is a tool with potential use in medicine and dentistry. The manufacture of metals and composites is already advanced, however, concerns about titanium hypersensitivity, tissue staining, and corrosion caused by gradual material degradation encourage research into more biocompatible alternatives.
OBJECTIVE
This systematic scoping review aimed to gather studies that evaluated zirconia implants produced by additive manufacturing to describe the current stage of the printing technique and the final product.
METHODS
Searches in Embase, PubMed, SCOPUS, Web of Science, and Google Scholar databases were enriched with manual searches between February and March 2021 and updated in June 2022 using keywords: zirconium implants, zirconium oxide, additive manufacturing, rapid prototyping, 3D printing, selective laser melting, and electron beam melting. The criteria included studies that evaluated or described zirconia implants obtained by 3D printing, with a direct relationship to dentistry or orthopedics.
RESULTS
The database search resulted in 671 articles. Eight articles were selected for full reading and remained in this systematic review.
CONCLUSION
The printing technique for zirconia implants is promising. However, further studies are required before implants produced by the printing technique can be tested clinically. The literature with results regarding the impression product is still limited.
Topics: Zirconium; Dental Implants; Printing, Three-Dimensional; Titanium
PubMed: 37721549
DOI: 10.1922/EJPRD_2513Kreve11 -
The Journal of Prosthetic Dentistry May 2020Different parameters affect the marginal and internal fit of zirconia fixed partial dentures (FPDs) on natural teeth. Determining a way to optimize these restorations is...
STATEMENT OF PROBLEM
Different parameters affect the marginal and internal fit of zirconia fixed partial dentures (FPDs) on natural teeth. Determining a way to optimize these restorations is essential.
PURPOSE
The purpose of this systematic review was to determine the variables affecting the marginal fit and internal accuracy of zirconia FPDs on natural teeth.
MATERIAL AND METHODS
An electronic search was conducted by 2 independent reviewers by using the MEDLINE, Cochrane, Web of Science, and Scopus databases, as well as Google Scholar, for studies published up to July 2018, and a manual search was conducted from the reference lists of related articles. Eligibility criteria included articles in English published in peer-reviewed journals that assessed the marginal and/or internal adaptation of zirconia FPDs on teeth with 3 or more units, with at least 1 of the experimental groups being frameworks or FPDs fabricated from zirconia. Risk of bias was assessed with the aid of the Cochrane Handbook for Systematic Reviews of Interventions.
RESULTS
The search provided 418 records, with 41 fulfilling the inclusion criteria. The selected studies showed considerable heterogeneity regarding materials, state of sintering, manufacturer and computer-aided design and computer-aided manufacturing (CAD-CAM) system, experimental methodology, sample size, and span length. Of the included articles, 36 were in vitro studies and 5 were clinical studies, most of which exhibited high-performance and detection biases. CAD-CAM systems provided more precise marginal and internal fit than CAM systems. An increase of framework span length to 6 or more units decreased both marginal and internal fit. The reported marginal gap tended to increase after the veneering process. The introduction of a conventional impression into an otherwise digital workflow seems to have a negative effect on the marginal fit.
CONCLUSIONS
The accuracy of zirconia FPDs or frameworks is considerably influenced by the processing procedure used and the choice of CAD-CAM system.
Topics: Computer-Aided Design; Dental Marginal Adaptation; Denture, Partial, Fixed; Zirconium
PubMed: 31703922
DOI: 10.1016/j.prosdent.2019.06.019