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Sabri H, Alhachache S, Saxena P, Dubey P, Nava P, Rufai SH, Sarkarat F. Microsurgery in periodontics and oral implantology: a systematic review of current clinical applications and outcomes. Evid Based Dent 2024:10.1038/s41432-024-01024-4. [PMID: 38867104 DOI: 10.1038/s41432-024-01024-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 05/03/2024] [Indexed: 06/14/2024]
Abstract
OBJECTIVES The aim of this systematic review was to comprehensively explore the current trends and therapeutic approaches in which an operating microscope (OM) is used in periodontics and dental implant surgeries. MATERIALS AND METHODS A systematic search strategy was built to detect studies including various surgical techniques performed under an OM. PubMed, EMBASE, and SCOPUS databases were searched. No limitations in terms of time and language were applied. The data regarding the study design, type of procedure, treatment groups, and surgical outcomes were collected and analyzed descriptively. In addition, a bibliometric analysis was performed concerning the co-authorship and keyword co-occurrence network. RESULTS Out of 1985 articles, finally, 55 met the inclusion criteria. Current periodontal and implant microsurgery trends consist of: periodontal therapy, dental implant microsurgery, soft tissue grafting and periodontal plastic surgery, bone augmentation, ridge preservation, and ortho-perio microsurgery. The bibliometric analysis revealed "guided tissue regeneration", "periodontal regeneration" and "root coverage" being the most repeated keywords (landmark nodes). 132 authors within 29 clusters were identified, publishing within the frameworks of "periodontal and implant microsurgery". CONCLUSION Within its limitations, this systematic review provides an overview of the latest trends in periodontal and implant microsurgery when considering the use of an OM as the magnification tool. Also, it discusses the reported success and outcomes of the mentioned procedures.
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Affiliation(s)
- Hamoun Sabri
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA.
| | - Sara Alhachache
- Department of Periodontics, University of Louisville School of Dental Medicine, Louisville, KY, USA
| | - Pramiti Saxena
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Prerana Dubey
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Paolo Nava
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Syed Hanan Rufai
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Farzin Sarkarat
- Department of Oral and Maxillofacial Surgery, Gulf Medical University, Ajman, United Arab Emirates
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Ardila CM, González-Arroyave D, Vivares-Builes AM. A Systematic Review of Randomized Clinical Trials Evaluating the Efficacy of Minimally Invasive Surgery for Soft Tissue Management: Aesthetics, Postoperative Morbidity, and Clinical Results. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:medicina59050924. [PMID: 37241156 DOI: 10.3390/medicina59050924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/09/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023]
Abstract
Background and Objectives: The necessity for less invasive and patient-friendly surgical therapies guided the development of the "minimally invasive surgical technique" (MIST). The aim of this systematic review was to evaluate the efficacy of MIST for soft tissue management considering aesthetic results, postoperative morbidity, and clinical outcomes. Materials and Methods: Several databases were used to conduct a thorough analysis of the scientific evidence. To investigate randomized clinical trials (RCTs), MeSH terms and keywords were provided. Results: Eleven RCTs were chosen. These experiments included 273 patients. The trials that explored MIST for papilla preservation presented greater efficacy in increasing papillary height (p < 0.05). MIST showed stable clinical outcomes for the management of excessive gingival display and with a flapless technique for single implant placement. Considering the treatment of gingival recessions, some RCTs presented greater root coverage with MIST (p < 0.05), while other trials did not show differences between groups. Regarding aesthetic perception, five RCTs indicated high patient satisfaction with MIST (p < 0.05). Similarly, six RCTs reported that patients in the MIST group presented significantly less post-surgical pain and lower wound healing scores (p < 0.01). Conclusions: It was concluded that using MIST resulted in more clinical studies reporting better clinical outcomes. Considering aesthetic appearance, slightly more than half of the clinical trials also showed improved results with MIST. Likewise, regarding postoperative morbidity, 60% of the clinical trials also described better scores with MIST. All of this indicates that MIST is a good alternative for the management of soft tissues.
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Affiliation(s)
- Carlos M Ardila
- Basic Studies Department, School of Dentistry, Universidad de Antioquia UdeA, Medellín 050010, Colombia
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Di Gianfilippo R, Wang IC, Steigmann L, Velasquez D, Wang HL, Chan HL. Efficacy of microsurgery and comparison to macrosurgery for gingival recession treatment: a systematic review with meta-analysis. Clin Oral Investig 2021; 25:4269-4280. [PMID: 33928441 DOI: 10.1007/s00784-021-03954-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 04/19/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVES Microsurgical principles, techniques, and armamentarium have made significant contributions to the periodontal plastic surgery. The present meta-analysis aimed to investigate the overall efficacy of microsurgery on root coverage, and its clinical outcomes when compared to traditional macrosurgery. MATERIAL AND METHODS Electronic searches on PubMed, Embase, and CINAHL were used to retrieve prospective clinical trials. Primary outcomes were the mean root coverage (mRC) and probability of achieving complete root coverage (cRC), with secondary outcomes as other periodontal parameters and patient-reported outcome measures (PROMs). RESULTS Nineteen studies were included in the quantitative analysis. Microsurgery was estimated to achieve 83.3% mRC and 69.3% cRC. From a subgroup of 9 comparative studies, it was estimated microsurgery increased mRC by 6.6% (p<0.001) and cRC by 27.9% (p<0.01) compared to macrosurgical control treatments. Operating microscope (OM) yielded a significantly 6.7% higher mRC than the control group (p=0.002), while using loupes showed 6.16% increase in mRC with a borderline significance (p=0.09). OM and loupes-only had a 31.05% (p=0.001) and 25.54% (p=0.001) increases in achieving cRC compared to control, respectively. As for PROMs, microsurgery reduced postoperative pain (p<0.001) and enhanced esthetics (p= 0.05). CONCLUSIONS Microsurgery significantly improved mean root coverage, probability of achieving complete root coverage, esthetics, and post-surgical recovery. Microsurgery enhances not only subclinical healing but also clinical outcomes, possibly owing to its minimally invasive approach and surgical precision. CLINICAL RELEVANCE Periodontal plastic microsurgery is minimally invasive, inducing less surgical trauma and ultimately resulting in improved clinical outcomes, patient's satisfaction, and quality of life.
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Affiliation(s)
- Riccardo Di Gianfilippo
- Department of Periodontics and Oral Medicine, University of Michigan - School of Dentistry, 1011 North University Avenue, Ann Arbor, MI, USA
| | - I-Ching Wang
- Department of Periodontics and Oral Medicine, University of Michigan - School of Dentistry, 1011 North University Avenue, Ann Arbor, MI, USA
| | - Larissa Steigmann
- Department of Periodontics and Oral Medicine, University of Michigan - School of Dentistry, 1011 North University Avenue, Ann Arbor, MI, USA
| | - Diego Velasquez
- Department of Periodontics and Oral Medicine, University of Michigan - School of Dentistry, 1011 North University Avenue, Ann Arbor, MI, USA.,Private Practice, 415 North Alloy Drive, Fenton, MI, 48430, USA
| | - Hom-Lay Wang
- Department of Periodontics and Oral Medicine, University of Michigan - School of Dentistry, 1011 North University Avenue, Ann Arbor, MI, USA
| | - Hsun-Liang Chan
- Department of Periodontics and Oral Medicine, University of Michigan - School of Dentistry, 1011 North University Avenue, Ann Arbor, MI, USA.
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Goyal L, Chawla K. Efficacy of microsurgery in treatment of localized or multiple gingival recession: A systematic review. J Oral Biol Craniofac Res 2021; 11:237-244. [PMID: 33665073 DOI: 10.1016/j.jobcr.2021.02.004] [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: 09/10/2020] [Revised: 01/30/2021] [Accepted: 02/01/2021] [Indexed: 10/22/2022] Open
Abstract
Objective To address the clinical question whether microsurgery hold an advantage in terms of clinical and patient oriented outcome over conventional macrosurgical procedures in the treatment of gingival recession. Material and methods A Literature search on MEDLINE, SCOPUS, EMBASE (Excerpta Medica Database) via Ovid and Cochrane library was conducted in order to investigate clinical studies on efficacy of microsurgery in the treatment of localized or multiple gingival recession as compared to conventional macrosurgical procedures. Publications before May 2020 and grey literature was searched without any language restrictions. Primary outcome considered was change in recession depth and mean root coverage. Whereas, change in clinical attachment level, Change in keratinized tissue, patient oriented outcome like esthetics, pain and discomfort were the secondary outcome. Based on inclusion criteria ten studies were included in systematic review. Data was extracted and analyzed. Results and conclusion All the included studies showed improvement in the mean percentage of root coverage or mean root coverage (primary outcome) when microsurgical approach was used. Predictability of complete root coverage is better with microsurgical instrumentation but results are not statistically significant. As far as patient centered outcome is concerned, there is no evidence for recommendation of microsurgery.
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Affiliation(s)
- Lata Goyal
- Department of Dentistry (Periodontology), All India Institute of Medical Sciences, Bathinda, India
| | - Kirti Chawla
- Department of Periodontics, Jamia Millia Islamia, New Delhi, India
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Pereira CHS, Pereira ACBDMS, Francischone CE. Comparative Clinical Study Using Short and Conventional Implants in Bilateral Jaw Posteriors. Braz Dent J 2020; 31:368-373. [PMID: 32901711 DOI: 10.1590/0103-6440202003204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 06/01/2020] [Indexed: 11/21/2022] Open
Abstract
The aim of this study was to clinically and radiographically compare extra short and standards implants. Forty-two implants were installed in 10 selected patients. They received prosthetic loading only after the conventional waiting time for osseointegration and the prostheses were made ferulized. Radiographic shots were performed to evaluate vertical and horizontal bone losses at times T1 (prosthetic installation), T2 (6 months follow-up) and T3 (12 months follow-up). Biological parameters such as bone level around the implants (CBL) were evaluated, CBL alteration (CBLC), total crown length (TCL) and implant/crown ratio (ICR) were digitally calculated. All implants included in the study were submitted to the analysis of the implant stability quotient (ISQ) at the time of implant installation (T0) and at 12 months of prosthetic function (T3). Data were statistically tested. The ICR was higher in the test group than in the control group (p<0.0001). The CBL measurements at the beginning of the study were 0.21±0.19 mm and 0.32±0.38 mm and at 12 months 0.65±0.24 mm and 0.87±0.34 mm, respectively in the test and control groups. CBLCs and CBL were similar at all times (p>0.05). No correlation was found between CBLC and ICR parameters, as well as between ISQ and implant length. We may conclude that standards and extra short implants can provide similar clinical results in prosthetic rehabilitation of the atrophic jaw over 12 months of follow-up.
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Moro MG, Souto MLS, Rovai ES, Cesar Neto JB, Holzhausen M, Pannuti CM. Effect of magnification on root coverage surgery. BRAZILIAN JOURNAL OF ORAL SCIENCES 2020. [DOI: 10.20396/bjos.v19i0.8658221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Root coverage surgery can be performed in patients with gingival recession to cover the exposed root aiming to control hypersensitivity and promotes better aesthetic. Optical magnification has been proposed as a refinement in this surgical technique to increase root coverage. This approach may lead to enhanced soft tissue stability, less post-operative discomfort, better predictability and esthetic appearance. Aim: This systematic review aimed to evaluate the effectiveness of magnification on root coverage surgery when compared to procedures performed without magnification. Methods: Randomized controlled trials with a follow-up of at least 6 months that compared surgeries for root coverage performed under optic magnification versus conventional (macro) root coverage surgery were screened. The primary outcome was mean root coverage (mm) (MRC) and secondary outcomes were percentage of root coverage (PRC) and complete root coverage (CRC). Results: Of 569 papers relevant to this review, seven were included. Meta-analysis showed that the use of magnification may favor greater PRC (7.38%, 95% CI 3.66-11.09). Conclusion: Magnification can increase PRC in root coverage surgeries. More randomized trials with the use of magnification may be necessary to verify if this benefit is clinically relevant, in order to justify the use of this device.
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Gürlek Ö, Gümüş P, Nizam N, Buduneli N. Coronally advanced flap with connective tissue graft or xenogeneic acellular dermal matrix in the treatment of multiple gingival recessions: A split-mouth randomized clinical trial. J ESTHET RESTOR DENT 2019; 32:380-388. [PMID: 31762155 DOI: 10.1111/jerd.12547] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 09/16/2019] [Accepted: 10/23/2019] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To evaluate the clinical efficacy of xenogeneic acellular dermal matrix (XADM) or connective tissue graft (CTG) combined with modified-coronally advanced flap (M-CAF) in the treatment of multiple gingival recessions. MATERIALS AND METHODS Twelve participants with bilateral MGRs (multiple gingival recession) (82 gingival recessions) randomly received XADM (test group, 41 teeth) on one side and subepithelial CTG (control group, 41 teeth) on the other side in conjunction with M-CAF in the same session and completed the 18-months study period. Recession depth (RD), recession width (RW), keratinized tissue width (KTW), probing depth (PD), and clinical attachment level (CAL) were recorded at baseline, and 6-, 18-months postoperatively. RESULTS PD was significantly higher in the test group at 18-months (P < .05). PD in the test group was also significantly higher at 6- and 18-months compared to baseline (P < .05). RD and RW were significantly lower at 6- and 18-months compared to baseline in both groups (P < .05) and both parameters were significantly higher in the test group at 18-months (P < .05). Percentage of teeth with complete root coverage in the test and control groups were similar at 6-months (78% and 70.7%, respectively) and at 18-months (both 87.8%) (P > .05). CONCLUSION Within the limits of the study, M-CAF combined with XADM or CTG seems to be similarly effective in RD reduction of class I and II MGRs at least in the short term. Soft tissue shrinkage and increase in PD may be observed with XADM, while; CTG seems to provide stable clinical outcomes for 18-months follow-up. CLINICAL SIGNIFICANCE Even though the CTG and XADM in conjunction with M-CAF may provide similar RD reduction in class I and II multiple gingival recessions in the short term. CTGs may be superior in terms of soft tissue shrinkage and PD values.
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Affiliation(s)
- Önder Gürlek
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - Pınar Gümüş
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - Nejat Nizam
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - Nurcan Buduneli
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
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Gürlek Ö, Kaval ME, Buduneli N, Nizam N. Extra-short implants in the prosthetic rehabilitation of the posterior maxilla. Aust Dent J 2019; 64:353-358. [PMID: 31356692 DOI: 10.1111/adj.12711] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/21/2019] [Indexed: 11/29/2022]
Abstract
AIM To compare clinical outcomes of 'extra-short' and regular bone level implants in the posterior maxilla for 12 months after loading. MATERIALS AND METHODS Twenty-three systemically healthy, non-smoking patients received 30 extra-short, 24 regular bone level implants. Acrylic stents were fabricated for each patient for correct implant positioning. Implant lengths were 4-6 mm in the test, 8/10 mm in the control group. Radiographic evaluation was performed at baseline, 6, and 12 months after loading. Crestal bone level (CBL), CBL change (CBLC), true crown length (TCL), implant/crown ratio (ICR) and residual bone height (RBH) below maxillary sinus floor were calculated digitally. Data were tested statistically. RESULTS Residual bone height was significantly lower, and TCL and ICR were higher in the test than the control group (P < 0.0001). CBL measurements at baseline were 0.19 ± 0.18 mm and 0.31 ± 0.37 mm and at 12 months, 0.24 ± 0.24 mm and 0.41 ± 0.31 mm, respectively in the test and control groups. CBL values at 12 months were significantly lower in the test than the control group (P < 0.05). CBLCs were similar at all times (P > 0.05). No correlation was found between the CBLC and implant/prosthetic parameters. CONCLUSION Extra-short and regular implants might provide similar clinical outcomes in prosthetic rehabilitation of atrophic maxilla, during 12 months follow-up.
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Affiliation(s)
- Ö Gürlek
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - M E Kaval
- Department of Endodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - N Buduneli
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - N Nizam
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
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Dai A, Huang J, Ding P, Chen L. Long‐term stability of root coverage procedures for single gingival recessions: A systematic review and meta‐analysis. J Clin Periodontol 2019; 46:572-585. [PMID: 30980404 DOI: 10.1111/jcpe.13106] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 03/13/2019] [Accepted: 03/26/2019] [Indexed: 12/23/2022]
Affiliation(s)
- Anna Dai
- Department of Periodontology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
| | - Jia‐Ping Huang
- Department of Periodontology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
| | - Pei‐Hui Ding
- Department of Periodontology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
| | - Li‐Li Chen
- Department of Periodontology The Second Affiliated Hospital of Zhejiang University School of Medicine Hangzhou China
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Nizam N, Eren G, Akcalı A, Donos N. Maxillary sinus augmentation with leukocyte and platelet-rich fibrin and deproteinized bovine bone mineral: A split-mouth histological and histomorphometric study. Clin Oral Implants Res 2017; 29:67-75. [PMID: 28786494 DOI: 10.1111/clr.13044] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2017] [Indexed: 12/17/2022]
Abstract
OBJECTIVES To evaluate the effect of leukocyte and platelet-rich fibrin (L-PRF) in combination with deproteinized bovine bone mineral (DBBM) on bone regeneration in maxillary sinus augmentation. MATERIAL AND METHODS Thirteen patients (nine males and four females, mean age ± SD; 49.92 ± 10.37) were enrolled to the study. 26 maxillary sinus augmentation procedures were randomly performed using DBBM and L-PRF mixture (test) or DBBM alone (control) in a split-mouth design. The same surgical procedures were performed in both groups, and bone biopsies were harvested from the implant sites 6 months postoperatively for histological and histomorphometric evaluations as the primary outcome of the study. Implants were placed and then loaded in the augmented sites after 6 months. The secondary outcomes included clinical and radiographic data and were obtained pre- and postoperatively. RESULTS There was no qualitative difference in histological analyses among the groups. In all samples, a newly formed bone was in direct contact with the residual material. The percentages of newly formed bone (test; 21.38 ± 8.78% and control; 21.25 ± 5.59%), residual bone graft (test; 25.95 ± 9.54% and control; 32.79 ± 5.89%), bone graft in contact with the newly formed bone (test; 47.33 ± 12.33% and control; 54.04 ± 8.36%), and soft tissue (test; 52.67 ± 12.53% and control; 45.96 ± 8.36%) were similar among the groups (p < .05). Similar radiographic bone height in the augmented area was observed, and implant survival rate was 100% for both groups. CONCLUSIONS Both techniques were effective for maxillary sinus augmentation, and after 6 months of healing, the addition of L-PRF in DBBM did not improve the amount of regenerated bone or the amount of the graft integrated into the newly formed bone under histological and histomorphometric evaluation.
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Affiliation(s)
- Nejat Nizam
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - Gülnihal Eren
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey
| | - Aliye Akcalı
- Department of Periodontology, School of Dentistry, Ege University, İzmir, Turkey.,Centre for Oral Clinical Research, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London, UK
| | - Nikolaos Donos
- Centre for Oral Clinical Research, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London, UK
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Evaluation of Laser Speckle Contrast Imaging for the Assessment of Oral Mucosal Blood Flow following Periodontal Plastic Surgery: An Exploratory Study. BIOMED RESEARCH INTERNATIONAL 2017; 2017:4042902. [PMID: 28232940 PMCID: PMC5292366 DOI: 10.1155/2017/4042902] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 01/04/2017] [Indexed: 01/25/2023]
Abstract
The laser speckle contrast imaging (LSCI) is proved to be a reliable tool in flap monitoring in general surgery; however, it has not been evaluated in oral surgery yet. We applied the LSCI to compare the effect of a xenogeneic collagen matrix (Geistlich Mucograft®) to connective tissue grafts (CTG) on the microcirculation of the modified coronally advanced tunnel technique (MCAT) for gingival recession coverage. Gingival microcirculation and wound fluid were measured before and after surgery for six months at twenty-seven treated teeth. In males, the flap microcirculation was restored within 3 days for both grafts followed by a hyperemic response. During the first 8 days the blood flow was higher at xenogeneic graft comparing to the CTG. In females, the ischemic period lasted for 7–12 days depending on the graft and no hyperemic response was observed. Females had more intense and prolonged wound fluid production. The LSCI method is suitable to capture the microcirculatory effect of the surgical intervention in human oral mucosa. The application of xenogeneic collagen matrices as a CTG substitute does not seem to restrain the recovery of graft bed circulation. Gender may have an effect on postoperative circulation and inflammation.
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