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Nagrani T, Kumar S, Haq MA, Dhanasekaran S, Gajjar S, Patel C, Sinha S, Haque M. Use of Injectable Platelet-Rich Fibrin Accompanied by Bone Graft in Socket Endurance: A Radiographic and Histological Study. Cureus 2023; 15:e46909. [PMID: 37841989 PMCID: PMC10569439 DOI: 10.7759/cureus.46909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2023] [Indexed: 10/17/2023] Open
Abstract
Background Ridge preservation became a crucial dental health issue and strategy to keep away from ridge defacement after post-tooth loss. The recent scientific evolution of platelet-rich fibrin (PRF) comprises a parenteral formulation of PRF. The combined allograft for socket preservation gives benefits. In this study, bone allografts, demineralized freeze-dried bone allografts (DFDBA) and freeze-dried bone allografts (FDBA) are used in a 30:70 ratio alone or in combination with injectable PRF (I-PRF) for socket preservation. Methods This study is a radiographic and histological examination conducted on 60 participants aged between 19-65 years. Participating patients agreed voluntarily that they would not bear any fixed prosthesis for the next nine months and plan for implanted teeth placement, including multi-rooted mandibular molars denticles. Both groups received atraumatic extraction; then, the socket was preserved with bone allograft alone in the control group and bone allograft mixed with I-PRF, forming sticky bone, in the experimental group. Clinical, radiological, and histological assessments were taken at the inception stage, three months, six months, and nine months. A multivariate regression model and a generalized estimating equation (GEE) model were used to analyse the effects of these changes on outcomes. Results In all the parameters, the test group indicated a good amount of bone growth with increasing intervals of time for bone height radiographically with statistically significant difference present (p<0.05) and histologically after nine months when socket site grafted with bone graft in combination with I-PRF. Conclusion This study's results demonstrated that I-PRF possesses the potential to regenerate and heal in the tooth-extracted socket. This study further recommends the implementation of I-PRF in safeguarding and conserving the raised rim of the tooth. Future research should take place on the osteogenic capability of I-PRF in more comprehensive ridge accession surgical procedures and additional expanding and improving capacities in periodontal reconstruction.
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Affiliation(s)
- Tanya Nagrani
- Periodontology, Karnavati School of Dentistry, Karnavati University, Gandhinagar, IND
| | - Santosh Kumar
- Periodontology and Implantology, Karnavati School of Dentistry, Karnavati University, Gandhinagar, IND
| | - Md Ahsanul Haq
- Bio-Statistics, Infectious Diseases Division, icddr, b, Dhaka, BGD
| | | | - Shreya Gajjar
- Periodontology, Karnavati School of Dentistry, Karnavati University, Gandhinagar, IND
| | - Chandni Patel
- Periodontology, Karnavati School of Dentistry, Karnavati University, Gandhinagar, IND
| | - Susmita Sinha
- Physiology, Khulna City Medical College and Hospital, Khulna, BGD
| | - Mainul Haque
- Karnavati Scientific Research Center (KSRC), Karnavati School of Dentistry, Karnavati University, Gandhinagar, IND
- Pharmacology and Therapeutics, National Defence University of Malaysia, Kuala Lumpur, MYS
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Abushahba F, Algahawi A, Areid N, Hupa L, Närhi T. Bioactive Glasses in Periodontal Regeneration
A Systematic Review
. Tissue Eng Part C Methods 2023; 29:183-196. [PMID: 37002888 DOI: 10.1089/ten.tec.2023.0036] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023] Open
Abstract
Bioactive glasses (BAGs) are surface-active ceramic materials that can be used in bone regeneration due to their known osteoconductive and osteoinductive properties. This systematic review aimed to study the clinical and radiographic outcomes of using BAGs in periodontal regeneration. The selected studies were collected from PubMed and Web of Science databases, and included clinical studies investigating the use of BAGs on periodontal bone defect augmentation between January 2000 and February 2022. The identified studies were screened using Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. A total of 115 full-length peer-reviewed articles were identified. After excluding duplicate articles between the databases and applying the inclusion and exclusion criteria, 14 studies were selected. The Cochrane risk of bias tool for randomized trials was used to assess the selected studies. Five studies compared using BAGs with open flap debridement (OFD) without grafting materials. Two of the selected studies were performed to compare the use of BAGs with protein-rich fibrin, one of which also included an additional OFD group. Also, one study evaluated BAG with biphasic calcium phosphate and used a third OFD group. The remaining six studies compared BAG filler with hydroxyapatite, demineralized freeze-dried bone allograft, autogenous cortical bone graft, calcium sulfate β-hemihydrate, enamel matrix derivatives, and guided tissue regeneration. This systematic review showed that using BAG to treat periodontal bone defects has beneficial effects on periodontal tissue regeneration. OSF Registration No.: 10.17605/OSF.IO/Y8UCR.
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Affiliation(s)
- Faleh Abushahba
- University of Turku, 8058, Department of Prosthetic Dentistry and Stomatognathic Physiology, Turku, Varsinais-Suomi, Finland,
| | - Ahmed Algahawi
- University of Turku, 8058, Department of Periodontology, Turku, Varsinais-Suomi, Finland,
| | - Nagat Areid
- University of Turku, 8058, Department of Prosthetic Dentistry and Stomatognathic Physiology Institute of Dentistry, University of Turku, Turku, Finland,
| | - Leena Hupa
- Åbo Akademi University, Johan Gadolin Process Chemistry Centre, Turku, Finland,
| | - Timo Närhi
- University of Turku Faculty of Medicine, 60654, Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, Turku, Finland,
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Kumar S, Desai N, Joshi S, Hirani T, Gajjar S, Patel C, Bhakkand SR, Girdhar GA, Govindool SR, Wan Ahmad Fakuradzi WFS, Haque M. Biphasic Calcium Phosphate Versus Demineralized Freeze-Dried Bone Allograft in the Treatment of Periodontal Disease: A Clinical and Radiographical Evaluation. Cureus 2022; 14:e29131. [PMID: 36133502 PMCID: PMC9470539 DOI: 10.7759/cureus.29131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/13/2022] [Indexed: 11/18/2022] Open
Abstract
Aim The study aimed to clinically and radiographically evaluate the effect of biphasic calcium phosphate (BCP) versus demineralized freeze-dried bone allograft (DFDBA) in treating periodontal disease. Method The study consisted of 44 patients. The sites were randomly assigned to receive one of two treatment modalities (BCP at site 1 and demineralized freeze-dried bone at site 2) by a computerized method. All the clinical data were measured with the help of a University of North Carolina-15 (UNC-15) probe at the baseline, three months, and six months postoperatively. Radiovisiographs were taken using a Rinn XCP® (Dentsply/Rinn Corp, Elgin, IL) system and an oral grid using the paralleling technique. A manual calculation of the defect area was undertaken at the end of six months and was compared with the other groups. Result The linear bone growth recorded for site 1 at the end of six months was 3.8 ± 1.14 mm, and site 2 was 4.6 ± 1.07 mm. The intergroup comparison showed more remarkable linear bone growth in site 2, which was statistically insignificant, with a mean difference of 0.8 ± 1.23 mm and a p-value of 0.07. Conclusion Improvements were observed on all the documented parameters. However, the sites treated with DFDBA showed better periodontal regeneration.
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Cannillo V, Salvatori R, Bergamini S, Bellucci D, Bertoldi C. Bioactive Glasses in Periodontal Regeneration: Existing Strategies and Future Prospects-A Literature Review. MATERIALS 2022; 15:ma15062194. [PMID: 35329645 PMCID: PMC8954447 DOI: 10.3390/ma15062194] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/11/2022] [Accepted: 03/13/2022] [Indexed: 12/22/2022]
Abstract
The present review deals with bioactive glasses (BGs), a class of biomaterials renowned for their osteoinductive and osteoconductive capabilities, and thus widely used in tissue engineering, i.e., for the repair and replacement of damaged or missing bone. In particular, the paper deals with applications in periodontal regeneration, with a special focus on in vitro, in vivo and clinical studies. The study reviewed eligible publications, identified on the basis of inclusion/exclusion criteria, over a ranged time of fifteen years (from 1 January 2006 to 31 March 2021). While there are many papers dealing with in vitro tests, only a few have reported in vivo (in animal) research, or even clinical trials. Regardless, BGs seem to be an adequate choice as grafts in periodontal regeneration.
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Affiliation(s)
- Valeria Cannillo
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10, 41125 Modena, Italy;
- Correspondence:
| | - Roberta Salvatori
- Department of Industrial Engineering and BIOtech Research Center, University of Trento, 38123 Trento, Italy;
| | - Stefania Bergamini
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), University of Modena and Reggio Emilia, 41124 Modena, Italy; (S.B.); (C.B.)
| | - Devis Bellucci
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10, 41125 Modena, Italy;
| | - Carlo Bertoldi
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), University of Modena and Reggio Emilia, 41124 Modena, Italy; (S.B.); (C.B.)
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Jaiswal Y, Kumar S, Mishra V, Bansal P, Anand KR, Singh S. Efficacy of decalcified freeze-dried bone allograft in the regeneration of small osseous defect: A comparative study. Natl J Maxillofac Surg 2018; 8:143-148. [PMID: 29386818 PMCID: PMC5773989 DOI: 10.4103/0975-5950.221714] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Aim: To access the efficacy of decalcified freeze-dried bone allograft (DFDBA) in the regeneration of bone following small osseous defect in minor oral surgery. Objectives: To evaluate the ability of DFDBA to enhance the rate of wound healing and assess radiographic bone density, pain, and infection preoperatively and postoperatively. Materials and Methods: Twenty patients with cysts were assessed. Ten patients were filled with DFDBA (Group 1) and ten without bone graft (Group 2), respectively. Radiographic bone density was assessed on preoperative, intraoperative, and postoperative radiographs on 1st day, 3rd month, and at 6th month using Adobe Photoshop CS6 - Grayscale histogram. Results: Bone density in Group 1 was found to be significantly higher than in Group 2 on 3rd and 6th month postoperatively with a P = 0.024 and P = 0.016 which was statistically significant. The percentage increase in bone density between both the group was determined and yielded no difference over a period of time, but the difference in percentage increase was markedly higher in Group 1 compared to Group 2 at all the time intervals. Conclusion: Bone formed as depicted by bone density is significantly higher when DFDBA is used in small bony defects.
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Affiliation(s)
- Yashmi Jaiswal
- Department of Oral and Maxillofacial Surgery, I.T.S. Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India
| | - Sanjeev Kumar
- Department of Oral and Maxillofacial Surgery, I.T.S. Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India
| | - Vijay Mishra
- Department of Oral and Maxillofacial Surgery, I.T.S. Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India
| | - Puneet Bansal
- Department of Oral and Maxillofacial Surgery, I.T.S. Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India
| | - Kumar Rakshak Anand
- Department of Oral and Maxillofacial Surgery, I.T.S. Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India
| | - Sukumar Singh
- Department of Oral and Maxillofacial Surgery, I.T.S. Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India
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Xue W, Xiaobo Z, Bin H, Yanhan D, Shumei L. [Decalcified freeze-dried bone allograft combined with rich platelet derivatives for the treatment of human periodontal intrabony defects: a Meta-analysis]. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 2017; 35:636-642. [PMID: 29333779 PMCID: PMC7041155 DOI: 10.7518/hxkq.2017.06.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 09/06/2017] [Indexed: 11/21/2022]
Abstract
OBJECTIVE This review aims to systematically evaluate the effect of decalcified freeze-dried bone allograft (DFDBA) combined with rich platelet derivatives on the treatment of human periodontal intrabony defects. METHODS A search in PubMed, Web of Science, Embase, Cochrane Library, CNKI, and other electronic databases was conducted to identify randomized controlled trials (RCT) of the use of DFDBA combined with rich platelet derivatives in the treatment of human periodontal intrabony defects, performed before May 2016. The quality of the RCTs was assessed. RevMan 5.3 software was applied for Meta-analysis. RESULTS A total of nine RCTs were included. A total of 194 patients and 303 defects were involved. Short-term (6 months) and long-term (12 to 18 months) groups were included. Meta-analysis results revealed that DFDBA combined with rich platelet derivatives was superior to DFDBA or rich platelet derivatives alone for probing depth reduction in the short-term [MD=0.75 mm, 95% confidence intervals (CI) (0.31 mm, 1.20 mm), P=0.001 0] and longterm groups [MD=0.87 mm, 95%CI (0.02 mm, 1.72 mm), P=0.04], clinical attachment level gain in the short-term [MD=
0.65 mm, 95%CI (0.08 mm, 1.22 mm), P=0.03] and long-term groups [MD=1.31 mm, 95%CI (0.60 mm, 2.01 mm), P<0.000 3], gingival recession reduction in the long-term group [MD=-0.58 mm, 95%CI (-0.78 mm, -0.38mm), P<0.000 01], bone fill gain in the short-term [MD=0.52 mm, 95%CI (0.03 mm, 1.00 mm), P=0.04] and long-term groups [MD=1.26 mm, 95%CI (0.65 mm, 1.86 mm), P<0.000 1]. CONCLUSIONS DFDBA combined with platelet rich derivatives is probably effective in the treatment of human periodontal intrabony defects. It is probably superior to DFDBA or platelet rich derivatives alone. Considering the limitation of the included studies, high-quality and large-sample RCTs are required to evaluate the effect.
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Affiliation(s)
- Wei Xue
- Dept. of Stomatology, The People's Hospital in Zheng' an County, Zunyi City, Zunyi 563000, China
| | - Zhong Xiaobo
- Dept. of Conservative Dentistry and Endodontics, Stomatological Hospital of Chongqing Medical University, Chongqing 401147, China
| | - He Bin
- Dept. of Conservative Dentistry and Endodontics, Stomatological Hospital of Chongqing Medical University, Chongqing 401147, China
| | - Deng Yanhan
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing 401147, China
| | - Luo Shumei
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
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Reddy BR, Sudhakar J, Rajesh N, Sandeep V, Reddy YM, Gnana Sagar WR. Comparative clinical and radiographic evaluation of mineralized cancellous bone allograft (puros ®) and autogenous bone in the treatment of human periodontal intraosseous defects: 6-months follow-up study. J Int Soc Prev Community Dent 2016; 6:S248-S253. [PMID: 28217545 PMCID: PMC5285603 DOI: 10.4103/2231-0762.197207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 12/22/2016] [Accepted: 12/30/2016] [Indexed: 11/30/2022] Open
Abstract
AIMS Several materials have been introduced as bone grafts, i.e., autografts, allograft, xenografts, and alloplastic grafts, and studies have shown them to produce greater clinical bone defect fill than open flap debridement alone. The aim of this clinical and radiological 6-month study was to compare and evaluate the clinical outcome of deep intraosseous defects following reconstructive surgery with the use of mineralized cancellous bone allograft (Puros®) or autogenous bone. MATERIALS AND METHODS Ten patients with 12 sites exhibiting signs of moderate generalized chronic periodontitis were enrolled in the study. The investigations were confined to two and three-walled intra bony defects with a preoperative probing depth of ≥5 mm. Six of these defects were treated with Puros® (group A) the remaining six were treated with autogenous bone graft (group B). Allocation to the two groups was randomized. The clinical parameters, plaque index (PI), gingival index (GI), probing pocket depth (PPD), clinical attachment level (CAL), and bone fill, were recorded at different time intervals at the baseline, 1 month, 3 months, and 6 months. Intraoral radiographs were taken using standardized paralleling cone technique at baseline, 1, 3, and 6 months. Statistical analysis was done by using the one-way analysis of variance (ANOVA) followed by Tukey highly significant difference. RESULTS Both groups resulted in decrease in probing depth (group A, 3.0 mm; group B, 2.83 mm) and gain in clinical attachment level (group A, 3.33 mm; group B, 3.0 mm) over a period of 6 months, which was statistically insignificant. CONCLUSION Within the limitations of the present study, it can be concluded that both mineralized cancellous bone allograft (Puros®) or autogenous bone result in significant clinical improvements.
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Affiliation(s)
- B. Ravinder Reddy
- Department of Periodontology, Nanded Rural Dental College and Research Centre, Nanded, Maharashtra, India
| | - J. Sudhakar
- Department of Periodontology, G.Pullareddy Dental College, Kurnool, Andhra Pradesh, India
| | - Nichenametla Rajesh
- Department of Periodontology, G.Pullareddy Dental College, Kurnool, Andhra Pradesh, India
| | - V. Sandeep
- Department of Pedodontics, G.Pullareddy Dental College, Kurnool, Andhra Pradesh, India
| | - Y. Muralidhar Reddy
- Department of Orthodontics, G.Pullareddy Dental College, Kurnool, Andhra Pradesh, India
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Blaggana V, Gill AS, Blaggana A. A clinical and radiological evaluation of the relative efficacy of demineralized freeze-dried bone allograft versus anorganic bovine bone xenograft in the treatment of human infrabony periodontal defects: A 6 months follow-up study. J Indian Soc Periodontol 2014; 18:601-7. [PMID: 25425822 PMCID: PMC4239750 DOI: 10.4103/0972-124x.142454] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Accepted: 02/19/2014] [Indexed: 11/15/2022] Open
Abstract
Background: The ultimate goal of periodontal therapy entails regeneration of the periodontal tissues lost as a consequence of periodontitis. Predictable correction of vertical osseous defects has however posed as a constant therapeutic challenge. The aim of our present study is to evaluate the relative efficacy of demineralized freeze-dried bone allograft (DFDBA) vs anorganic bovine bone xenograft (ABBX) in the treatment of human infrabony periodontal defects. Materials and Methods: 15 patients with 30 bilaterally symmetrical defect sites in either of the arches, in the age group of 25-50 years were selected as part of split-mouth study design. Defect-A (right side) was grafted with DFDBA while Defect-B (left side) was grafted with ABBX. Various clinical and radiographic parameters viz. probing depth(PD), clinical attachment level(CAL) and linear bone fill were recorded preoperatively, 12- & 24-weeks postoperatively. Results: Both defect-A & defect-B sites exhibited a highly significant reduction in probing depth, and gain in clinical attachment level and linear bone fill at 12-weeks & at the end of 24-weeks. Comparative evaluation between the study groups revealed a statistically non-significant reduction in probing depth (P<0.1) and mean gain in linear bone fill (P<0.1). However, there was a statistically significant gain in clinical attachment level (P<0.05) in Defect-A (CD=0.356) as compared to Defect-B (CD=0.346). Conclusions: Within the limits of this study, both the materials viz. ABBX and DFDBA are beneficial for the treatment of periodontal infrabony defects. Both the materials were found to be equally effective in all respects except the gain in attachment level, which was found to be more with DFDBA. Long-term studies are suggested to evaluate further the relative efficacy of the two grafts.
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Affiliation(s)
- Vikram Blaggana
- Department of Periodontology and Oral Implantology, Krishna Dental College, Ghaziabad, Uttar Pradesh, India
| | - Amarjit Singh Gill
- Department of Periodontology, Genesis Institute of Dental Sciences and Research, Ferozepur, Punjab, India
| | - Anshu Blaggana
- Department of Periodontology, PDM Dental College and Research Institute, Bahadurgarh, Haryana, India
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Oporto V GH, Fuentes R, Borie E, del Sol M, Orsi IA, Engelke W. Radiographical and clinical evaluation of critical size defects in rabbit calvaria filled with allograft and autograft: a pilot study. Int J Clin Exp Med 2014; 7:1669-1675. [PMID: 25126163 PMCID: PMC4132127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 06/23/2014] [Indexed: 06/03/2023]
Abstract
Regeneration of resorbed edentulous sites can be induced by bone grafts from the subject himself and/or by the use of biomaterials. At present, there has been an extensive search for biomaterials that are evaluated by artificially creating one or more critical defects. The aim of this work was to clinically and radiographically analyze bone formation by the use of some biomaterials in artificially created defects in the parietal bone of rabbits. Six rabbits were used, creating defects of 8 mm in diameter in parietal bones. One defect was maintained with coagulum only, and in others, freeze-dried bone allograft (FDBA), autologous bone, and a combination of autologous bone with FDBA respectively, were added. Animals were sacrificed at 15-90 days with 2 weeks interval each, and calvaria were analyzed macroscopically, measuring by digital caliper the lack of filling at the surface of defects, identifying limits at anteroposterior and coronal view, realizing a digital photograph register of their external surfaces. This was subsequently evaluated radiographically by occlusal film radiography used to quantify its density through software. In conclusion, autologous bone showed the best behavior, clinically as well as radiographically. However, FDBA is a good option as an alternative to autologous bone as its behavior was slightly lower over time. The combination of autologous bone and FDBA in the same defect showed results considerably inferior to grafts used separately. Low radiopacity and clear limits were observed through time for the control coagulum filled defect.
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Affiliation(s)
| | - Ramón Fuentes
- CIMOFIR Research Centre, Dental School, Universidad de La FronteraTemuco, Chile
| | - Eduardo Borie
- CIMOFIR Research Centre, Dental School, Universidad de La FronteraTemuco, Chile
- Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São PauloRibeirão Preto, SP, Brazil
| | - Mariano del Sol
- Department of Basic Sciences, Medicine School, Universidad de La FronteraTemuco, Chile
- Research Centre in Biomedical Sciences, Universidad Autónoma de ChileChile
| | - Iara Augusta Orsi
- Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São PauloRibeirão Preto, SP, Brazil
| | - Wilfried Engelke
- Dentistry Centre, Department of Maxillofacial Surgery, University of GöttingenGöttingen, Germany
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