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Samal A, Chan HL, Wang IC, Webber L, Gallagher S, Majzoub J, Barootchi S, Mazzocco J, Betancourt AR, Castilho R, Masotti M, Kripfgans OD. Use of High-Frequency Ultrasound for the Correlation of Epithelial Rete Peg Variation. ULTRASOUND IN MEDICINE & BIOLOGY 2024:S0301-5629(24)00236-9. [PMID: 39142939 DOI: 10.1016/j.ultrasmedbio.2024.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Revised: 05/23/2024] [Accepted: 06/07/2024] [Indexed: 08/16/2024]
Abstract
OBJECTIVE Rete pegs are projections of the oral epithelium into connective tissue. Their dimensions change during pathological conditions and may correlate with wound-healing status. Non-invasive, high-frequency ultrasound (US) may be able to capture these changes and aid in early detection of histopathological changes. The aim of this preclinical study is to correlate US images with histology and quantify epithelial layers at different tooth sites. METHODS Sagittal B-mode images of mid-facial and interproximal oral soft tissue sites were recorded in a preclinical minipig model using a linear array in second harmonic mode (12/24 MHz). Histology samples from the same locations were stained (hematoxylin and eosin), digitized and registered with US images. Manual annotations were used to measure distances D1 (thickness of epithelium on histology vs. hyperechoic zone on US) and D2 (sum of epithelial thickness and length of rete pegs on histology vs. sum of hyperechoic and hypoechoic zone on US) to statistically analyze them. RESULTS Ultrasonic-derived dimensions yielded a mean bias of -0.64 (55% coefficient of variance [COV]: -180 to +180 µm) and -12 µm (39% COV: -260 to +240 µm) for D1 and D2, respectively. Individualized analysis of D1 and D2 by tooth type showed similar tends in the ability to differentiate between epithelium at different tooth locations, on both histology and US. CONCLUSION Assessing soft tissue dimensions on a sub-millimeter scale using clinical imaging hardware is still a developing area. Future research might open doors for diagnosis of oral pathologies and abnormal wound healing, and may limit false-positive indications for biopsies.
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Affiliation(s)
- Ankita Samal
- Department of Radiology, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA; Department of Periodontology, University of Iowa College of Dentistry and Dental Clinics, Iowa City, IA, USA
| | - Hsun-Liang Chan
- Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA; Department of Periodontology, Ohio State University College of Dentistry, Columbus, OH, USA
| | - I-Ching Wang
- Department of Periodontology, University of Iowa College of Dentistry and Dental Clinics, Iowa City, IA, USA; Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Liana Webber
- Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Sarah Gallagher
- Department of Radiology, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Jad Majzoub
- Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Shayan Barootchi
- Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - John Mazzocco
- Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Amanda Rodriguez Betancourt
- Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA; Department of Periodontology, University of Illinois Chicago College of Dentistry, Chicago, IL, USA
| | - Rogerio Castilho
- Department of Periodontology and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Maria Masotti
- Department of Radiology, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Oliver D Kripfgans
- Department of Radiology, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA.
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Strauss FJ, Gil A, Smirani R, Rodriguez A, Jung R, Thoma D. The use of digital technologies in peri-implant soft tissue augmentation - A narrative review on planning, measurements, monitoring and aesthetics. Clin Oral Implants Res 2024; 35:922-938. [PMID: 38308466 DOI: 10.1111/clr.14238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 11/21/2023] [Accepted: 01/11/2024] [Indexed: 02/04/2024]
Abstract
OBJECTIVE To identify the different uses and modalities of digital technologies to diagnose, plan and monitor peri-implant soft tissue conditions and aesthetics. METHODS A comprehensive narrative review of pertinent literature was conducted, critically appraising key digital technologies that may assist peri-implant soft tissue augmentation and assessment. An electronic search on four databases including studies published prior to 1st July 2023 was performed and supplemented by a manual search. RESULTS Predominantly, tools such as cone beam computed tomography (CBCT), intraoral scanning (iOS), intraoral ultrasonography and digital spectrophotometry were commonly to assess and monitor peri-implant soft tissues. The main clinical and research applications included: (i) initial assessment of mucosal thickness, supra-crestal tissue height and keratinized mucosa width, (ii) evaluation of peri-implant soft tissue health and inflammation, (iii) monitoring profilometric changes and midfacial mucosal margin stability over time and (iv) aesthetic evaluation through colour assessment. While evidence for some digital tools may be limited, the integration of digital technologies into peri-implant soft tissue management holds great promise. These technologies offer improved precision, comfort and speed in assessment, benefiting both patients and clinicians. CONCLUSION As digital technologies progress, their full potential in peri-implant soft tissue augmentation and their value will become more evident with ongoing research. Embracing these innovations and their potential benefits is recommended to ensure that during progress in implant dentistry, patient care is not hindered.
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Affiliation(s)
- Franz Josef Strauss
- Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
- Department of Conservative Dentistry, Faculty of Dentistry, University of Chile, Santiago, Chile
| | - Alfonso Gil
- Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Rawen Smirani
- Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
- Univ. Bordeaux, INSERM, BioTis, U1026, Bordeaux, France
- CHU de Bordeaux, Service de Médecine Bucco-Dentaire, Bordeaux, France
| | - Amanda Rodriguez
- Department of Periodontics and Oral Medicine, Dental School, University of Michigan, Ann Arbor, Michigan, USA
| | - Ronald Jung
- Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Daniel Thoma
- Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
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Yeung AWK, AlHadidi A, Vyas R, Bornstein MM, Watanabe H, Tanaka R. Nonionizing diagnostic imaging modalities for visualizing health and pathology of periodontal and peri-implant tissues. Periodontol 2000 2024. [PMID: 38951932 DOI: 10.1111/prd.12591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 05/20/2024] [Accepted: 06/17/2024] [Indexed: 07/03/2024]
Abstract
Radiographic examination has been an essential part of the diagnostic workflow in periodontology and implant dentistry. However, radiographic examination unavoidably involves ionizing radiation and its associated risks. Clinicians and researchers have invested considerable efforts in assessing the feasibility and capability of utilizing nonionizing imaging modalities to replace traditional radiographic imaging. Two such modalities have been extensively evaluated in clinical settings, namely, ultrasonography (USG) and magnetic resonance imaging (MRI). Another modality, optical coherence tomography (OCT), has been under investigation more recently. This review aims to provide an overview of the literature and summarize the usage of USG, MRI, and OCT in evaluating health and pathology of periodontal and peri-implant tissues. Clinical studies have shown that USG could accurately measure gingival height and crestal bone level, and classify furcation involvement. Due to physical constraints, USG may be more applicable to the buccal surfaces of the dentition even with an intra-oral probe. Clinical studies have also shown that MRI could visualize the degree of soft-tissue inflammation and osseous edema, the extent of bone loss at furcation involvement sites, and periodontal bone level. However, there was a lack of clinical studies on the evaluation of peri-implant tissues by MRI. Moreover, an MRI machine is very expensive, occupies much space, and requires more time than cone-beam computed tomography (CBCT) or intraoral radiographs to complete a scan. The feasibility of OCT to evaluate periodontal and peri-implant tissues remains to be elucidated, as there are only preclinical studies at the moment. A major shortcoming of OCT is that it may not reach the bottom of the periodontal pocket, particularly for inflammatory conditions, due to the absorption of near-infrared light by hemoglobin. Until future technological breakthroughs finally overcome the limitations of USG, MRI and OCT, the practical imaging modalities for routine diagnostics of periodontal and peri-implant tissues remain to be plain radiographs and CBCTs.
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Affiliation(s)
- Andy Wai Kan Yeung
- Oral and Maxillofacial Radiology, Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - Abeer AlHadidi
- Oral and Maxillofacial Pathology, Radiology and Medicine, New York University, New York, New York, USA
| | - Rutvi Vyas
- University of Detroit Mercy School of Dentistry, Detroit, Michigan, USA
| | - Michael M Bornstein
- Department of Oral Health & Medicine, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
| | - Hiroshi Watanabe
- Dental Radiology and Radiation Oncology, Department of Oral Restitution, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - Ray Tanaka
- Oral and Maxillofacial Radiology, Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
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Rodriguez AB, Kripfgans OD, Kozloff KM, Samal A, Woo JM, Shehabeldin M, Chan HL. Ultrasound-based jawbone surface quality evaluation after alveolar ridge preservation. J Periodontol 2024. [PMID: 38742564 DOI: 10.1002/jper.23-0370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 04/06/2024] [Accepted: 04/10/2024] [Indexed: 05/16/2024]
Abstract
BACKGROUND Bone readiness for implant placement is typically evaluated by bone quality/density on 2-dimensional radiographs and cone beam computed tomography at an arbitrary time between 3 and 6 months after tooth extraction and alveolar ridge preservation (ARP). The aim of this study is to investigate if high-frequency ultrasound (US) can classify bone readiness in humans, using micro-CT as a reference standard to obtain bone mineral density (BMD) and bone volume fraction (BVTV) of healed sockets receiving ARP in humans. METHODS A total of 27 bone cores were harvested during the implant surgery from 24 patients who received prior extraction with ARP. US images were taken immediately before the implant surgery at a site co-registered with the tissue biopsy collection location, made possible with a specially designed guide, and then classified into 3 tiers using B-mode image criteria (1) favorable, (2) questionable, and (3) unfavorable. Bone mineral density (hydroxyapatite) and BVTV were obtained from micro-CT as the gold standard. RESULTS Hydroxyapatite and BVTV were evaluated within the projected US slice plane and thresholded to favorable (>2200 mg/cm3; >0.45 mm3/mm3), questionable (1500-2200 mg/cm3; 0.4-0.45 mm3/mm3), and unfavorable (<1500 mg/cm3; <0.4 mm3/mm3). The present US B-mode classification inversely scales with BMD. Regression analysis showed a significant relation between US classification and BMD as well as BVTV. T-test analysis demonstrated a significant correlation between US reader scores and the gold standard. When comparing Tier 1 with the combination of Tier 2 and 3, US achieved a significant group differentiation relative to mean BMD (p = 0.004, true positive 66.7%, false positive 0%, true negative 100%, false negative 33.3%, specificity 100%, sensitivity 66.7%, receiver operating characteristics area under the curve 0.86). Similar results were found between US-derived tiers and BVTV. CONCLUSION Preliminary data suggest US could classify jawbone surface quality that correlates with BMD/BVTV and serve as the basis for future development of US-based socket healing evaluation after ARP.
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Affiliation(s)
- Amanda B Rodriguez
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - Oliver D Kripfgans
- Department of Radiology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Kenneth M Kozloff
- Department of Biomedical Engineering, University of Michigan Medical School, Ann Arbor, Michigan, USA
- Department of Orthopedic Surgery, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Ankita Samal
- Department of Radiology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Jae-Man Woo
- Department of Radiology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Mostafa Shehabeldin
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - Hsun-Liang Chan
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
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Torumtay Cin G, Lektemur Alpan A, Açikgöz G, Özlü Uçan G. Ultrasonographic analysis of palatal donor site healing accelerated with platelet-rich fibrin following subepithelial connective tissue harvesting. J Appl Oral Sci 2024; 32:e20230448. [PMID: 38655988 DOI: 10.1590/1678-7757-2023-0448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 02/21/2024] [Indexed: 04/26/2024] Open
Abstract
OBJECTIVE Platelet-rich fibrin (PRF) contains a variety of growth factors and bioactive molecules that play crucial roles in wound healing and angiogenesis. We aimed to evaluate the effects of PRF on tissue thickness and vascularization of the palatal donor site by ultrasound (USG) following subepithelial connective tissue harvesting. METHODOLOGY A subepithelial connective tissue graft was harvested from the palatal region with a single incision for root coverage in 20 systemically healthy patients. In the test group (n = 10), the PRF membrane was placed at the donor site, whereas no material was applied in the control group (n=10). Palatal tissue thickness (PTT) and pulsatility index (PI) were evaluated by USG at baseline and on the 3rd, 7th, 14th, 30th, and 90th days after surgery. The early healing index (EHI) was used to evaluate donor site healing for 30 days. RESULTS PTT was significantly higher in the PRF group on the 3rd and 14th days after surgery when compared to the controls. In the PRF-treated group, PI levels were significantly higher than in the controls, especially on the 14th day. PTT increased significantly 90 days after surgery compared to the test group baseline, but controls showed a significant decrease. The PRF group showed statistically significant improvements in EHI scores compared to controls on days 3, 7, and 14. This study found a negative correlation between PI values and EHI scores on postoperative days three and seven in the test group. CONCLUSION USG is a non-invasive, objective method to radiographically evaluate the regenerative effects of PRF on palatal wound healing after soft tissue harvesting. To overcome graft inadequacy in reharvesting procedures, PRF application may enhance clinical success and reduce possible complications by increasing tissue thickness and revascularization in the donor area.
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Affiliation(s)
- Gizem Torumtay Cin
- Pamukkale University, Faculty of Dentistry, Department of Periodontology, Denizli, Turkey
| | - Aysan Lektemur Alpan
- Pamukkale University, Faculty of Dentistry, Department of Periodontology, Denizli, Turkey
| | - Gözde Açikgöz
- Pamukkale University, Faculty of Dentistry, Department of Oral and Maxillofacial Radiology, Denizli, Turkey
| | - Gülfem Özlü Uçan
- Gelişim University, Faculty of Dentistry, Department of Oral and Maxillofacial Radiology, İstanbul, Turkey
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Figueredo CA, Catunda RQ, Gibson MP, Major PW, Almeida FT. Use of ultrasound imaging for assessment of the periodontium: A systematic review. J Periodontal Res 2024; 59:3-17. [PMID: 37872805 DOI: 10.1111/jre.13194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/25/2023] [Accepted: 10/01/2023] [Indexed: 10/25/2023]
Abstract
The objective of this study was to systematically review the literature regarding diagnostic applications of ultrasound imaging for evaluation of the periodontium in humans. The search was conducted on Medline, EMBASE, Web of Science, Scopus, Cochrane, and PubMed up to April 3, 2023. The studies included were exclusively human studies that assessed the periodontium with ultrasound (US) imaging (b-mode). Outcomes measured included alveolar bone level, alveolar bone thickness, gingival thickness, and blood flow quantification. References were imported to Covidence. Two reviewers conducted phases 1 and 2. The JBI risk assessment tool for cross-sectional studies was used. Extracted data included the transducer and measurements used and the study's outcomes. The search yielded 4892 studies after removing duplicates. From these, 25 studies were included and selected for extraction. Included studies retrieved outcomes from US examinations of the periodontal tissues. From the selected studies, 15 used US on natural teeth, 4 used US on implants, 2 used US on edentulous ridges, and 4 used color flow/power in US to evaluate the blood flow. The results of the present systematic review suggest that US might be a feasible and valuable diagnostic tool for the periodontium, with the potential to complement shortfalls of current radiographic technologies.
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Affiliation(s)
- Carlos Alberto Figueredo
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Raisa Queiroz Catunda
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Monica P Gibson
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Paul W Major
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Fabiana T Almeida
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
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Amer L, Retout M, Jokerst JV. Activatable prodrug for controlled release of an antimicrobial peptide via the proteases overexpressed in Candida albicans and Porphyromonas gingivalis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.27.568833. [PMID: 38076788 PMCID: PMC10705279 DOI: 10.1101/2023.11.27.568833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/05/2024]
Abstract
We report the controlled release of an antimicrobial peptide using enzyme-activatable prodrugs to treat and detect Candida albicans and Porphyromonas gingivalis . Our motivation lies in the prevalence of these microorganisms in the subgingival area where the frequency of fungal colonization increases with periodontal disease. This work is based on an antimicrobial peptide that is both therapeutic and induces a color change in a nanoparticle reporter. This antimicrobial peptide was then built into a zwitterionic prodrug that quenches its activity until activation by a protease inherent to these pathogens of interest: SAP9 or RgpB for C. albicans and P. gingivalis , respectively. We first confirmed that the intact zwitterionic prodrug has negligible toxicity to fungal, bacterial, and mammalian cells absent a protease trigger. Next, the therapeutic impact was assessed via disk diffusion and viability assays and showed a minimum inhibitory concentration of 3.1 - 16 µg/mL, which is comparable to the antimicrobial peptide alone (absent integration into prodrug). Finally, the zwitterionic design was exploited for colorimetric detection of C. albicans and P. gingivalis proteases. When the prodrugs were cleaved, the plasmonic nanoparticles aggregated causing a color change with a limit of detection of 10 nM with gold nanoparticles and 3 nM with silver nanoparticles. This approach has value as a convenient and selective protease sensing and protease-induced treatment mechanism based on bioinspired antimicrobial peptides. Abstract Figure
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Qi B, Khazeinezhad R, Hariri A, Yim W, Jin Z, Sasi L, Chen C, Jokerst JV. Three-dimensional mapping of the greater palatine artery location and physiology. Dentomaxillofac Radiol 2023; 52:20230066. [PMID: 37641889 DOI: 10.1259/dmfr.20230066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023] Open
Abstract
OBJECTIVE To develop a novel technique for localizing and reconstructing the greater palatine artery (GPA) using three-dimensional (3D) technology. METHODS A miniaturized intraoral ultrasound transducer was used to imaging landmarks including the GPA, gingival margin (GM), and palatal masticatory mucosa (PMM). A 5-mm-thick solid hydrogel couplant was integrated to replace traditional ultrasound gel and avoid bubbles when moving the transducer. RESULTS A panorama image provided the relative localization of landmarks including the GPA, PMM, and hard palate. Short- and long-axis imaging of GPA was performed in five subjects including 3D mapping of GPA branches and surrounding tissues in a volume of 10 mm × 8 mm × 10 mm. Full-mouth Doppler imaging was also demonstrated on both the dorsal and ventral tongue as well as buccal mucosa and sublingual region on two subjects. CONCLUSIONS This study can measure the vertical distance from the GM to the GPA and depth from PMM to GPA and visualize the GPA localization in a 3D manner, which is critical to evaluate the available volume of palatal donor tissues and avoid sectioning of GPA during surgical harvesting of the tissues. Finally, the transducer's small size facilitates full-mouth Doppler imaging with the potential to improve the assessment, diagnosis, and management of oral mucosa.
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Affiliation(s)
- Baiyan Qi
- Materials Science and Engineering Program, University of California San Diego, La Jolla, California, United States
| | | | - Ali Hariri
- StyloSonic LLC, Lake Forest, California, United States
| | - Wonjun Yim
- Materials Science and Engineering Program, University of California San Diego, La Jolla, California, United States
| | - Zhicheng Jin
- Department of Nanoengineering, University of California San Diego, La Jolla, California, United States
| | - Lekshmi Sasi
- Department of Nanoengineering, University of California San Diego, La Jolla, California, United States
| | - Casey Chen
- Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, California, United States
| | - Jesse V Jokerst
- Materials Science and Engineering Program, University of California San Diego, La Jolla, California, United States
- Department of Nanoengineering, University of California San Diego, La Jolla, California, United States
- Department of Radiology, University of California San Diego, La Jolla, California, United States
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Retout M, Amer L, Yim W, Creyer MN, Lam B, Trujillo DF, Potempa J, O'Donoghue AJ, Chen C, Jokerst JV. A Protease-Responsive Polymer/Peptide Conjugate and Reversible Assembly of Silver Clusters for the Detection of Porphyromonas gingivalis Enzymatic Activity. ACS NANO 2023; 17:17308-17319. [PMID: 37602819 PMCID: PMC10561899 DOI: 10.1021/acsnano.3c05268] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
We report the reversible aggregation of silver nanoparticle (AgNP) assemblies using the combination of a cationic arginine-based peptide and sulfur-capped polyethylene glycol (PEG). The formation and dissociation of the aggregates were studied by optical methods and electron microscopy. The dissociation of silver clusters depends on the peptide sequence and PEG size. A molecular weight of 1 kDa for PEG was optimal for the dissociation. The most important feature of this dissociation method is that it can operate in complex biofluids such as plasma, saliva, bile, urine, cell media, or even seawater without a significant decrease in performance. Moreover, the peptide-particle assemblies are highly stable and do not degrade (or express of loss of signal upon dissociation) when dried and resolubilized, frozen and thawed, or left in daylight for a month. Importantly, the dissociation capacity of PEG can be reduced via the conjugation of a peptide-cleavable substrate. The dissociation capacity is restored in the presence of an enzyme. Based on these findings, we designed a PEG-peptide hybrid molecule specific to the Porphyromonas gingivalis protease RgpB. Our motivation was that this bacterium is a key pathogen in periodontitis, and RgpB activity has been correlated with chronic diseases including Alzheimer's disease. The RgpB limit of detection was 100 pM RgpB in vitro. This system was used to measure RgpB in gingival crevicular fluid (GCF) samples with a detection rate of 40% with 0% false negatives versus PCR for P. gingivalis (n = 37). The combination of PEG-peptide and nanoparticles dissociation method allows the development of convenient protease sensing that can operate independently of the media composition.
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Affiliation(s)
- Maurice Retout
- Department of Nano and Chemical Engineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Lubna Amer
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, United States
| | - Wonjun Yim
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, United States
| | - Matthew N Creyer
- Department of Nano and Chemical Engineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Benjamin Lam
- Department of Nano and Chemical Engineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Diego F Trujillo
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
| | - Jan Potempa
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow 30-387, Poland
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, Kentucky 40202, United States
| | - Anthony J O'Donoghue
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
| | - Casey Chen
- Herman Ostrow School of Dentistry, University of Southern California, 925 West 34th Street, Los Angeles, California 90089, United States
| | - Jesse V Jokerst
- Department of Nano and Chemical Engineering, University of California, San Diego, La Jolla, California 92093, United States
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, United States
- Department of Radiology, University of California, San Diego, La Jolla, California 92093, United States
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Soltani P, Yaghini J, Rafiei K, Mehdizadeh M, Armogida NG, Esposito L, Spagnuolo G. Comparative Evaluation of the Accuracy of Gingival Thickness Measurement by Clinical Evaluation and Intraoral Ultrasonography. J Clin Med 2023; 12:4395. [PMID: 37445430 DOI: 10.3390/jcm12134395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/10/2023] [Accepted: 06/28/2023] [Indexed: 07/15/2023] Open
Abstract
This study aimed to investigate the accuracy of gingival thickness measurement by two methods of clinical evaluation and intraoral ultrasonography. The gingival thickness was measured in the midbuccal area of the right maxillary lateral incisor and first molar teeth in 30 individuals. For clinical measurement, a #15 K-file with rubber stops was vertically inserted 2 mm apical to the gingival margin and the length of the file in the tissue was measured using a digital caliper. Ultrasonographic measurement was performed using an intraoral probe on the gingival surface in the midbuccal area, at the entry point of the file. Statistical analysis was performed by paired t-test, correlation coefficient, and receiver operating characteristic (ROC) curve (α = 0.05). In the anterior region, the mean gingival thicknesses using ultrasonography (1.517 ± 0.293 mm) and clinical evaluation (1.610 ± 0.272 mm) were not significantly different (p = 0.434). In the posterior region, the mean gingival thicknesses were significantly different between ultrasonography (1.372 ± 0.442 mm) and clinical evaluation (1.626 ± 0.310 mm) (p = 0.006). The area under ROC curve values for ultrasonographic measurements in the anterior and posterior regions were 0.681 and 0.597, respectively. The use of ultrasonography with an intraoral probe has acceptable accuracy for the determination of gingival thickness, especially for the anterior regions.
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Affiliation(s)
- Parisa Soltani
- Department of Oral and Maxillofacial Radiology, Dental Implants Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan 81745-33871, Iran
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples "Federico II", 80131 Naples, Italy
| | - Jaber Yaghini
- Department of Periodontics, Dental Implants Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan 81745-33871, Iran
| | - Kosar Rafiei
- Student Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan 81745-33871, Iran
| | - Mojdeh Mehdizadeh
- Department of Oral and Maxillofacial Radiology, Dental Implants Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan 81745-33871, Iran
| | - Niccolò Giuseppe Armogida
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples "Federico II", 80131 Naples, Italy
| | - Luigi Esposito
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples "Federico II", 80131 Naples, Italy
| | - Gianrico Spagnuolo
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples "Federico II", 80131 Naples, Italy
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Le LH, Nguyen KCT, Nguyen PTT, La TG, Major PW, Lou EHM. Estimating Crestal Thickness of Alveolar Bones on Intra-oral Ultrasonograms. ULTRASOUND IN MEDICINE & BIOLOGY 2023; 49:1345-1350. [PMID: 36813583 DOI: 10.1016/j.ultrasmedbio.2023.01.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 01/13/2023] [Accepted: 01/14/2023] [Indexed: 05/10/2023]
Abstract
OBJECTIVE Alveolar crestal bone thickness and level provide important diagnostic and prognostic information for orthodontic treatment, periodontal disease management and dental implants. Ionizing radiation-free ultrasound has emerged as a promising clinical tool in imaging oral tissues. However, the ultrasound image is distorted when the wave speed of the tissue of interest is different from the mapping speed of the scanner and, therefore, the subsequent dimension measurements are not accurate. This study was aimed at deriving a correction factor that can be applied to the measurements to correct for discrepancy caused by speed variation. METHODS The factor is a function of the speed ratio and the acute angle that the segment of interest makes with the beam axis perpendicular to the transducer. The phantom and cadaver experiments were designed to validate the method. DISCUSSION The comparisons agree well with absolute errors not more than 4.9%. Dimension measurements on ultrasonographs can be properly corrected by applying the correction factor without recourse to the raw signals. CONCLUSION The correction factor has reduced the measurement discrepancy on the acquired ultrasonographs for the tissue whose speed is different from the scanner's mapping speed.
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Affiliation(s)
- Lawrence H Le
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada; Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada; Department of Physics, University of Alberta, Edmonton, Alberta, Canada; School of Dentistry, University of Alberta, Edmonton, Alberta, Canada.
| | - Kim-Cuong T Nguyen
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada; Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | | | - Thanh-Giang La
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada
| | - Paul W Major
- School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Edmond H M Lou
- Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, Canada
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