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Rocha RS, Vianna CP, Trojan LC, Padovan LEM, Dos Santos MCGL. Comparison of sinusitis rate after sinus lift procedure and zygomatic implant surgery: a meta-analysis. Oral Maxillofac Surg 2024; 28:63-77. [PMID: 37266797 DOI: 10.1007/s10006-023-01159-1] [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: 01/19/2023] [Accepted: 05/13/2023] [Indexed: 06/03/2023]
Abstract
PURPOSE To evaluate and compare the reported sinusitis occurrence after the sinus lift procedure and zygomatic implant placement. METHODS This meta-analysis has been registered at PROSPERO. Studies were searched on six databases. Two authors screened titles and abstracts and fully analyzed the studies against the inclusion and exclusion criteria. The RoB 2.0 and the ROBINS-I tools were used to assess the quality and risk of bias of the included studies. The random-effects model was used for the meta-analysis. The prevalence of sinusitis was calculated based on the total of patients. Subgroup analysis was performed by sinus lift or zygomatic implant surgery technique. RESULTS The search identified 2419 references. After applying the inclusion criteria, 18 sinus lift and 9 zygomatic implant placement studies were considered eligible. The pooled prevalence of sinusitis after sinus lift procedure was 1.11% (95% CI 0.30-2.28). The prevalence after zygomatic implant placement was 3.76% (95% CI 0.12-10.29). In the subgroup analysis, the lateral window approach showed a prevalence of sinusitis of 1.35% (95% CI 0.34-2.8), the transcrestal technique of 0.00% (95% CI 0.00-3.18), and the SALSA technique of 1.20% (95% CI 0.00-5.10). Regarding the techniques for zygomatic implant placement, the sinus slot technique showed a prevalence of 21.62% (95% CI 9.62-36.52) and the intrasinus technique of 4.36% (95% CI 0.33-11.08), and the prevalence after the extrasinus technique was 0.00% (95% CI 0.00-1.22). CONCLUSION The sinusitis occurrence rate was higher after zygomatic implant placement than after sinus lift procedure and this occurrence was different depending on the used technique.
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Affiliation(s)
- Roberta Schroder Rocha
- Graduate Program in Cell and Molecular Biology, Cellular and Molecular Biology Department, Federal University of Paraná, Av. Cel. Francisco H. dos Santos, 100, Paraná, 81530-000, Curitiba, Brazil.
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Blyleven GM, Johnson TM, Inouye KA, Stancoven BW, Lincicum AR. Factors influencing intraoperative and postoperative complication occurrence: A series of 1135 periodontal and implant-related surgeries. Clin Exp Dent Res 2024; 10:e849. [PMID: 38345517 PMCID: PMC10847704 DOI: 10.1002/cre2.849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/13/2023] [Accepted: 01/15/2024] [Indexed: 02/15/2024] Open
Abstract
OBJECTIVES In periodontology, it is widely recognized that evidence characterizing the incidence and effect of treatment complications is lacking. The objective of this study was to assess the influence of operator-, procedure-, patient-, and site-associated factors on intraoperative and postoperative complication occurrence. MATERIAL AND METHODS A single investigator reviewed records of patients treated by eight periodontics residents from July 2018 through June 2022. For each procedure, the investigator recorded each intraoperative and postoperative complication or indicated that no complication had occurred. These outcomes were analyzed against a panel of explanatory covariates. In addition, the severity of each postoperative complication was assessed using a standardized grading system. RESULTS A total of 1135 procedures were included in the analysis. Intraoperative and postoperative complications were identified in 2.8% and 15.2% of procedures, respectively. The most common intraoperative complications were Schneiderian membrane perforation (1.3%) and gingival flap perforation/tear (1%), and the most common postoperative complications were dentin hypersensitivity (2.6%), excessive pain (2.5%), and infection (2.2%). Subepithelial connective tissue graft (odds ratio [OR]: 3.2, 95% confidence interval [CI]: 1.6, 6.1; p < .001), guided bone regeneration (OR: 3.0, 95% CI: 1.4, 6.5; p = .004), and guided bone regeneration with implant placement (OR: 3.1, 95% CI: 1.3, 7.6; p = .011) were associated with higher odds of postoperative complication, whereas lateral sinus elevation (OR: 102.5, 95% CI: 12.3, 852.9; p < .001), transalveolar sinus elevation (OR: 22.4, 95% CI: 2.2, 224.5; p = .008), open flap debridement (OR: 36.4, 95% CI: 3.0, 440.7; p = .005), and surgically facilitated orthodontic therapy (OR: 20.5, 95% CI: 1.2, 358.4; p = .039) were associated with higher odds of intraoperative complication occurrence. CONCLUSIONS Consistent with previous reports, procedure type appears to be the predominant factor driving complication occurrence. As analyses of treatment complications increase, individualized risk-benefit assessments will become progressively meaningful for patients.
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Affiliation(s)
- Gary M. Blyleven
- Department of PeriodonticsArmy Postgraduate Dental School, Postgraduate Dental College, Uniformed Services University of the Health Sciences, Fort EisenhowerAugustaGeorgiaUSA
| | - Thomas M. Johnson
- Department of PeriodonticsArmy Postgraduate Dental School, Postgraduate Dental College, Uniformed Services University of the Health Sciences, Fort EisenhowerAugustaGeorgiaUSA
| | - Kimberly Ann Inouye
- Department of PeriodonticsArmy Postgraduate Dental School, Postgraduate Dental College, Uniformed Services University of the Health Sciences, Fort EisenhowerAugustaGeorgiaUSA
| | - Brian W. Stancoven
- Department of PeriodonticsArmy Postgraduate Dental School, Postgraduate Dental College, Uniformed Services University of the Health Sciences, Fort EisenhowerAugustaGeorgiaUSA
| | - Adam R. Lincicum
- Department of PeriodonticsArmy Postgraduate Dental School, Postgraduate Dental College, Uniformed Services University of the Health Sciences, Fort EisenhowerAugustaGeorgiaUSA
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Elad A, Pul L, Rider P, Rogge S, Witte F, Tadić D, Mijiritsky E, Kačarević ŽP, Steigmann L. Resorbable magnesium metal membrane for sinus lift procedures: a case series. BMC Oral Health 2023; 23:1006. [PMID: 38097992 PMCID: PMC10722874 DOI: 10.1186/s12903-023-03695-4] [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: 08/04/2023] [Accepted: 11/22/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND The purpose of this case series was to demonstrate the use of a magnesium membrane for repairing the perforated membrane in both direct and indirect approaches, as well as its application in instances where there has been a tear of the Schneiderian membrane. CASE PRESENTATION The case series included four individual cases, each demonstrating the application of a magnesium membrane followed by bone augmentation using a mixture of xenograft and allograft material in the sinus cavity. In the first three cases, rupture of Schneiderian membrane occurred as a result of tooth extraction, positioning of the dental implant, or as a complication during the procedure. In the fourth case, Schneiderian membrane was perforated as a result of the need to aspirate a polyp in the maxillary sinus. In case one, 10 mm of newly formed bone is visible four months after graft placement. Other cases showed between 15 and 20 mm of newly formed alveolar bone. No residual magnesium membrane was seen on clinical inspection. The vertical and horizontal augmentations proved stable and the dental implants were placed in the previously grafted sites. CONCLUSION Within the limitations of this case series, postoperative clinical examination, and panoramic and CBCT images demonstrated that resorbable magnesium membrane is a viable material for sinus lift and Schneiderian membrane repair. The case series showed successful healing and formation of new alveolar bone with separation of the oral cavity and maxillary sinus in four patients.
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Affiliation(s)
| | - Luka Pul
- Department of Dental Medicine, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000, Osijek, Croatia
| | | | - Svenja Rogge
- Botiss Biomaterials GmbH, 15806, Zossen, Germany
| | - Frank Witte
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, Aßmannshauser Straße, 4-6, 14197, Berlin, Germany
| | - Dražen Tadić
- Botiss Biomaterials GmbH, 15806, Zossen, Germany
| | - Eitan Mijiritsky
- Department of Head and Neck and Maxillofacial Surgery, Tel-Aviv Sourasky Medical Center, The Sackler Faculty of Medicine, Tel-Aviv University, 6139001, Tel Aviv, Israel
| | - Željka Perić Kačarević
- Botiss Biomaterials GmbH, 15806, Zossen, Germany.
- Department of Anatomy, Histology, Embryology, Pathology Anatomy and Pathology Histology, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000, Osijek, Croatia.
| | - Larissa Steigmann
- Department of Oral Medicine, Infection, and Immunity, Division of Periodontology, Harvard School of Dental Medicine, Boston, MA, USA
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Alhayati JZ, Al-Anee AM. Evaluation of crestal sinus floor elevations using versah burs with simultaneous implant placement, at residual bone height ≥ 2.0 _ < 6.0 mm. A prospective clinical study. Oral Maxillofac Surg 2022:10.1007/s10006-022-01071-0. [PMID: 35567659 DOI: 10.1007/s10006-022-01071-0] [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: 01/25/2022] [Accepted: 05/04/2022] [Indexed: 10/18/2022]
Abstract
PURPOSE To evaluate the efficacy of Versah drills in breaching the maxillary sinus floor while keeping the membrane intact, as well as measure the implant stability (primary stability at the time of implant placement by the osseous densification of the residual bone height (RBH) of ≥ 2.0 _ < 6.0 mm, and secondary stability after 6 months of osseous healing period). METHODS This prospective clinical study, which included twenty crestal sinus floor elevations, was conducted on 17 patients (10 males and 7 females, ages 29 to 70 years). The sinus membrane integrity was clinically checked at the time of osseodensification sinus lifting and confirmed by CBCT after sinus augmentation and implant insertion. Time of operation has been recorded from the first drill to implant installation. Primary implant stability was measured using an Osstell beacon at the time of implant placement, and secondary stability was measured after 6 months of osseous healing. RESULTS The mean of secondary stability in the current study is significantly higher than the mean of primary stability (P ≤ 0.011), which was 74.22 ± 8.11 and 69.85 ± 9.74, respectively, in RBH 3.81 mm as a mean. There was no clinical evidence of membrane perforation or complication reports, and the average operation time was 11.2 ± 1.85 min. CONCLUSION The current study found that at highly atrophic posterior maxilla with a residual bone height of ≥ 2.0 _ < 6.0 mm, osseodensification using Versah drills was effective in crestal sinus elevation with no membrane perforation, which was confirmed by cone-beam CT scan postoperatively, and showed higher primary and secondary implant stability.
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Affiliation(s)
- Jenna Z Alhayati
- Department of Oral & Maxillofacial Surgery/Dental Implant Unit, College of Dentistry, University of Baghdad, Baghdad, Iraq
| | - Auday M Al-Anee
- Department of Oral & Maxillofacial Surgery/Dental Implant Unit, College of Dentistry, University of Baghdad, Baghdad, Iraq. .,Oral & Maxillofacial Surgery, Medical City, Al-Shaheed Gazi Alhariri Teaching Hospital for Specialized Surgeries, Baghdad, Iraq.
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Beck-Broichsitter BE, Gerle M, Wiltfang J, Becker ST. Perforation of the Schneiderian membrane during sinus floor elevation: a risk factor for long-term success of dental implants? Oral Maxillofac Surg 2020; 24:151-156. [PMID: 32002693 PMCID: PMC7230042 DOI: 10.1007/s10006-020-00829-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 01/03/2020] [Indexed: 12/13/2022]
Abstract
PURPOSE In cases of highly atrophic alveolar ridges, augmentation procedures became a frequent procedure to gain optimal conditions for dental implants. Especially in the maxilla sinus floor elevation procedures represent the gold standard pre-prosthetic and mainly successful procedure. The perforation of the Schneiderian is one of the most common complications. The aim of this study was to evaluate whether the intraoperative perforation of the Schneiderian membrane has an impact on long-term implant success. METHODS Thirty-four patients from a former study collective of the years 2005 and 2006 with a total of 41 perforations were invited for a follow-up examination to determine the long-term success rates after sinus floor elevation and subsequent implantation. RESULTS Twenty-one patients with 25 perforations were subsequently re-evaluated. One implant was lost due to a of periimplant infection after 232 days, resulting in an implant survival rate of 98% within a mean follow-up period of 8.9 years (± 1.5 years). CONCLUSION Regarding the long-term success, there was no increased risk for implant failure or other persisting complications, e.g., sinusitis, after intraoperative perforation during sinus floor elevation in this study.
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Affiliation(s)
- Benedicta E Beck-Broichsitter
- Department of Oral and Maxillofacial Surgery, Charité - University Medical Center Berlin, Augustenburger Platz 1, 13353, Berlin, Germany.
| | - Mirko Gerle
- Department of Oral and Maxillofacial Surgery, Schleswig-Holstein University Hospital, Arnold-Heller-Straße 3, Haus 26, 24105, Kiel, Germany
| | - Jörg Wiltfang
- Department of Oral and Maxillofacial Surgery, Schleswig-Holstein University Hospital, Arnold-Heller-Straße 3, Haus 26, 24105, Kiel, Germany
| | - Stephan Thomas Becker
- Department of Oral and Maxillofacial Surgery, Schleswig-Holstein University Hospital, Arnold-Heller-Straße 3, Haus 26, 24105, Kiel, Germany
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Kolerman R, Nissan J, Rahmanov M, Calvo-Guirado JL, Green NT, Tal H. Sinus augmentation analysis of the gradient of graft consolidation: a split-mouth histomorphometric study. Clin Oral Investig 2019; 23:3397-3406. [PMID: 30617584 DOI: 10.1007/s00784-018-2793-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 12/19/2018] [Indexed: 11/27/2022]
Abstract
OBJECTIVE The aim of this study was to histomorphometrically test the hypothesis that graft consolidation originates from the sinus floor. MATERIALS AND METHODS This prospective, randomized split-mouth study investigated patients undergoing bilateral maxillary lateral sinus floor augmentation using either freeze-dried bone allografts (FDBAs) or biphasic calcium phosphate (BCP) bone substitute. Apico-coronal core biopsies were harvested during implant placement 9 months after sinus floor augmentation, processed for histological observation, and measured histomorphometrically. RESULTS Biopsies were taken from 26 bilateral sites in 13 patients. The density of new bone (NB) decreased with increasing distance from the sinus floor. The percentage mean surface of NB ranged from 31 ± 9.5% at 2 mm from the sinus floor (G1) to 27.7 ± 11.2% at 4 mm (G2) for the FDBA specimens and from 30.0 ± 11.0% at G1 to 23.5 ± 9.9% at G2 for the BCP specimens. Evaluation of the residual graft particle (GP) area alone as a function of distance from the floor revealed a clear inverse gradient of 7.1 ± 6.6 to 9.1 ± 10.3 between G1 and G2 for the FDBA allografts, with the same tendency for the BCP alloplasts (21.9 ± 9.9 to 27.7 ± 6.6, respectively). CONCLUSION Our results support the concept that osteogenesis initiates in regions proximal to the bony walls of the maxillary sinus and may be enhanced by them. CLINICAL RELEVANCE The nature of the grafting material had a greater influence on the degree of NB formation in regions distant from the native walls where there is reduced inherent osteogenic potential.
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Affiliation(s)
- Roni Kolerman
- Department of Periodontology, the Maurice and Gabriela Goldschleger School of Dental Medicine, The Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
| | - Joseph Nissan
- Department of Oral Rehabilitation, the Maurice and Gabriela Goldschleger School of Dental Medicine, the Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Marina Rahmanov
- Department of Oral Rehabilitation, the Maurice and Gabriela Goldschleger School of Dental Medicine, the Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - José Luis Calvo-Guirado
- Department of General and Implant Dentistry, Faculty of Medicine and Dentistry, University of Murcia, Murcia, Spain
| | - Nirit Tager Green
- Department of Periodontology, the Maurice and Gabriela Goldschleger School of Dental Medicine, The Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Haim Tal
- Department of Periodontology, the Maurice and Gabriela Goldschleger School of Dental Medicine, The Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
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Beck-Broichsitter BE, Westhoff D, Behrens E, Wiltfang J, Becker ST. Impact of surgical management in cases of intraoperative membrane perforation during a sinus lift procedure: a follow-up on bone graft stability and implant success. Int J Implant Dent 2018; 4:6. [PMID: 29399707 PMCID: PMC5797725 DOI: 10.1186/s40729-018-0116-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 01/03/2018] [Indexed: 12/18/2022] Open
Abstract
Background Until now, sinus floor elevation represents the gold standard procedure in the atrophic maxilla in order to facilitate dental implant insertion. Although the procedure remains highly predictive, the perforation of the Schneiderian membrane might compromise the stability of the augmented bone and implant success due to chronic sinus infection. The aim of this retrospective cohort study was to show that a membrane tear, if detected and surgically properly addressed, has no influence on the survival of dental implants and bone resorption in the augmented area. Methods Thirty-one patients with 39 perforations could be included in this evaluation, and a control group of 32 patients with 40 sinus lift procedures without complications were compared regarding the radiographically determined development of bone level, peri-implant infection, and implant loss. Results Implant survival was 98.9% in the perforation group over an observation period of 2.7 (± 2.03) years compared to 100% in the control group after 1.8 (± 1.57) years. The residual bone level was significantly lower in the perforation group (p = 0.05) but showed no difference direct postoperatively (p = 0.7851) or in the follow-up assessment (p = 0.2338). Bone resorption remained not different between both groups (p = 0.945). A two-stage procedure was more frequent in the perforation group (p = 0.0003) as well as peri-implantitis (p = 0.0004). Conclusions Within the limits of our study, the perforation of the Schneiderian membrane did not have a negative impact on long-term graft stability or the overall implant survival.
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Affiliation(s)
- Benedicta E Beck-Broichsitter
- Department of Oral and Maxillofacial Surgery, Charité-University Medical Center Berlin, Augustenburger Platz 1, 13353, Berlin, Germany.
| | - Dorothea Westhoff
- Department of Oral and Maxillofacial Surgery, Schleswig-Holstein University Hospital, Arnold-Heller-Straße 3, Haus 26, 24105, Kiel, Germany
| | - Eleonore Behrens
- Department of Oral and Maxillofacial Surgery, Schleswig-Holstein University Hospital, Arnold-Heller-Straße 3, Haus 26, 24105, Kiel, Germany
| | - Jörg Wiltfang
- Department of Oral and Maxillofacial Surgery, Schleswig-Holstein University Hospital, Arnold-Heller-Straße 3, Haus 26, 24105, Kiel, Germany
| | - Stephan T Becker
- Department of Oral and Maxillofacial Surgery, Schleswig-Holstein University Hospital, Arnold-Heller-Straße 3, Haus 26, 24105, Kiel, Germany
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Sakkas A, Wilde F, Heufelder M, Winter K, Schramm A. Autogenous bone grafts in oral implantology-is it still a "gold standard"? A consecutive review of 279 patients with 456 clinical procedures. Int J Implant Dent 2017; 3:23. [PMID: 28573552 PMCID: PMC5453915 DOI: 10.1186/s40729-017-0084-4] [Citation(s) in RCA: 226] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 05/22/2017] [Indexed: 01/25/2023] Open
Abstract
Background This study assessed the clinical outcomes of graft success rate and early implant survival rate after preprosthetic alveolar ridge reconstruction with autologous bone grafts. Methods A consecutive retrospective study was conducted on all patients who were treated at the military outpatient clinic of the Department of Oral and Plastic Maxillofacial Surgery at the military hospital in Ulm (Germany) in the years of 2009 until 2011 with autologous bone transplantation prior to secondary implant insertion. Intraoral donor sites (crista zygomatico-alveolaris, ramus mandible, symphysis mandible, and anterior sinus wall) and extraoral donor site (iliac crest) were used. A total of 279 patients underwent after a healing period of 3–5 months routinely computer tomography scans followed by virtual implant planning. The implants were inserted using guided oral implantation as described by Naziri et al. All records of all the consecutive patients were reviewed according to patient age, history of periodontitis, smoking status, jaw area and dental situation, augmentation method, intra- and postoperative surgical complications, and surgeon’s qualifications. Evaluated was the augmentation surgical outcome regarding bone graft loss and early implant loss postoperatively at the time of prosthodontic restauration as well a follow-up period of 2 years after loading. Results A total of 279 patients underwent 456 autologous augmentation procedures in 546 edentulous areas. One hundred thirteen crista zygomatico-alveolaris grafts, 104 ramus mandible grafts, 11 symphysis grafts, 116 grafts from the anterior superior iliac crest, and 112 sinus lift augmentations with bone scrapes from the anterior facial wall had been performed. There was no drop out or loss of follow-up of any case that had been treated in our clinical center in this 3-year period. Four hundred thirty-six (95.6%) of the bone grafts healed successfully, and 20 grafts (4.4%) in 20 patients had been lost. Fourteen out of 20 patients with total graft failure were secondarily re-augmented, and six patients wished no further harvesting procedure. In the six patients, a partial graft resorption was detected at the time of implantation and additional simultaneous augmentation during implant insertion was necessary. No long-term nerve injury occurred. Five hundred twenty-five out of 546 initially planned implants in 259 patients could be inserted into successfully augmented areas, whereas 21 implants in 20 patients due to graft loss could not be inserted. A final rehabilitation as preplanned with dental implants was possible in 273 of the 279 patients. The early implant failure rate was 0.38% concerning two out of the 525 inserted implants which had to be removed before the prosthodontic restoration. Two implants after iliac crest augmentation were lost within a period of 2 years after loading, concerning a total implant survival rate after 2 years of occlusal loading rate of 99.6% after autologous bone augmentation prior to implant insertion. Conclusions This review demonstrates the predictability of autologous bone material in alveolar ridge reconstructions prior to implant insertion, independent from donor and recipient site including even autologous bone chips for sinus elevation. Due to the low harvesting morbidity of autologous bone grafts, the clinical results of our study indicate that autologous bone grafts still remain the “gold standard” in alveolar ridge augmentation prior to oral implantation.
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Affiliation(s)
- Andreas Sakkas
- Department of Oral and Plastic Maxillofacial Surgery, Military Hospital Ulm, Academic Hospital of the University of Ulm, Oberer Eselsberg 40, 89081, Ulm, Germany.
| | - Frank Wilde
- Department of Oral and Plastic Maxillofacial Surgery, Military Hospital Ulm, Academic Hospital of the University of Ulm, Oberer Eselsberg 40, 89081, Ulm, Germany
| | - Marcus Heufelder
- Department of Oral and Plastic Maxillofacial Surgery, Military Hospital Ulm, Academic Hospital of the University of Ulm, Oberer Eselsberg 40, 89081, Ulm, Germany
| | - Karsten Winter
- Institute of Anatomy, Medical Faculty of Leipzig University, Leipzig, Germany
| | - Alexander Schramm
- Department of Oral and Plastic Maxillofacial Surgery, Military Hospital Ulm, Academic Hospital of the University of Ulm, Oberer Eselsberg 40, 89081, Ulm, Germany.,Department of Oral and Plastic Maxillofacial Surgery, University Hospital Ulm, Ulm, Germany
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