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by Oded Ghelfan
PURPOSE The present study was designed to compare the long-term outcome and complications of cemented versus screw-retained implant restorations in partially edentulous patients. MATERIALS AND METHODS Consecutive patients with bilateral... more
PURPOSE The present study was designed to compare the long-term outcome and complications of cemented versus screw-retained implant restorations in partially edentulous patients. MATERIALS AND METHODS Consecutive patients with bilateral partial posterior edentulism comprised the study group. Implants were placed, and cemented or screw-retained restorations were randomly assigned to the patients in a split-mouth design. Follow-up (up to 15 years) examinations were performed every 6 months in the first year and every 12 months in subsequent years. The following parameters were evaluated and recorded at each recall appointment: ceramic fracture, abutment screw loosening, metal frame fracture, Gingival Index, and marginal bone loss. RESULTS Thirty-eight patients were treated with 221 implants to support partial prostheses. No implants during the follow-up period (mean follow-up, 66 ± 47 months for screw-retained restorations [range, 18 to 180 months] and 61 ± 40 months for cemented rest...
Publisher: The International journal of oral & maxillofacial implants
Publication Date: 2011
Publication Name: The International journal of oral & maxillofacial implants
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Marginal fit is an important clinical factor that affects restoration longevity. The accuracy of three polyvinyl siloxane putty-wash impression techniques was compared by marginal fit assessment using the nondestructive method. A... more
Marginal fit is an important clinical factor that affects restoration longevity. The accuracy of three polyvinyl siloxane putty-wash impression techniques was compared by marginal fit assessment using the nondestructive method. A stainless steel master cast containing three abutments with three metal crowns matching the three preparations was used to make 45 impressions: group A = single-step technique (putty and wash impression materials used simultaneously), group B = two-step technique with a 2-mm relief (putty as a preliminary impression to create a 2-mm wash space followed by the wash stage), and group C = two-step technique with a polyethylene spacer (plastic spacer used with the putty impression followed by the wash stage). Accuracy was assessed using a toolmaker microscope to measure and compare the marginal gaps between each crown and finish line on the duplicated stone casts. Each abutment was further measured at the mesial, buccal, and distal aspects. One-way analysis of variance was used for statistical analysis. P values and Scheffe post hoc contrasts were calculated. Significance was determined at .05. One-way analysis of variance showed significant differences among the three impression techniques in all three abutments and at all three locations (P < .001). Group B yielded dies with minimal gaps compared to groups A and C. The two-step impression technique with 2-mm relief was the most accurate regarding the crucial clinical factor of marginal fit.
Publication Date: 2013
Publication Name: The International Journal of Periodontics and Restorative Dentistry
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Publication Date: 2009
Publication Name: The Journal of Prosthetic Dentistry
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by Joseph Nissan and Oded Ghelfan
Bone grafting may be associated with soft and hard tissue complications. Recipient site complications encountered using cancellous block allografts for ridge augmentation are analyzed. A total of 101 consecutive patients (62 females and... more
Bone grafting may be associated with soft and hard tissue complications. Recipient site complications encountered using cancellous block allografts for ridge augmentation are analyzed. A total of 101 consecutive patients (62 females and 39 males; mean age 44 ± 17 years) were treated with implant-supported restoration of 137 severe atrophic alveolar ridges augmented with cancellous bone-block allografts. Alveolar ridge deficiency locations were classified as anterior maxilla (n = 58); posterior maxilla (n = 32 sinuses); posterior mandible (n = 32); and anterior mandible (n = 15). A total of 271 rough-surface implants were placed. Recipient site complications associated with block grafting (infection, membrane exposure, incision line opening, perforation of mucosa over the grafted bone, partial graft failure, total graft failure, and implant failure) were recorded. Partial and total bone-block graft failure occurred in 10 (7%) and 11 (8%) of 137 augmented sites, respectively. Implant failure rate was 12 (4.4%) of 271. Soft tissue complications included membrane exposure (42 [30.7%] of 137); incision line opening (41 [30%] of 137); and perforation of the mucosa over the grafted bone (19 [14%] of 137). Infection of the grafted site occurred in 18 (13%) of 137 bone blocks. Alveolar ridge deficiency location had a statistically significant effect on the outcome of recipient site complications. More complications were noted in the mandible compared to the maxilla. Age and gender had no statistically significant effect. Failures caused by complications were rarely noted in association with cancellous block grafting. The incidence of complications in the mandible was significantly higher. Soft tissue complications do not necessarily result in total loss of cancellous block allograft.
Publication Date: 2010
Publication Name: Journal of Periodontology
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Analysis of load transfer and stress distribution by splinted and unsplinted implant-supported fixed cemented restorationsmore
by Joseph Nissan and Oded Ghelfan
Publication Date: 2010
Publication Name: Journal of Oral Rehabilitation
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Publication Date: 2011
Publication Name: Journal of Oral and Maxillofacial Surgery
Research Interests: Dentistry, Titanium, Dental Materials, Dental Implants, Bite force, and 14 moreOral and Maxillofacial Surgery, Soil Cementation, Zinc Oxide, Humans, Mechanical Stress, Surface Properties, Dental Prosthesis Design, Eugenol, Elastic Modulus, Stress distribution, Crowns, Stress Distribution, Materials Testing, and Biomechanical Phenomena
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Intrasocket Reactive Soft Tissue for Primary Closure After Augmentation of Extraction Sites With Severe Bone Loss Before Implant Placementmore
by Joseph Nissan and Oded Ghelfan
Publication Date: 2009
Publication Name: Journal of Oral and Maxillofacial Surgery
Research Interests: Dentistry, Surgery, Treatment, Wound Healing, Minerals, and 19 moreDental Implants, Oral and Maxillofacial Surgery, Prospective studies, Humans, Young Adult, Follow-up studies, EXTRACTION, Aged, Middle Aged, Tooth Root, Granulation Tissue, Adult, Dental Prosthesis Design, Periodontal Diseases, Bone Loss, Tooth Extraction, Soft Tissue, Bone Substitutes, and Cohort Studies
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Publication Date: 2011
Publication Name: Journal of Oral and Maxillofacial Surgery
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Publication Date: 2011
Publication Name: Journal of Oral and Maxillofacial Surgery
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Publication Date: 2011
Publication Name: Clinical Oral Implants Research
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Efficacy of Cancellous Block Allograft Augmentation Prior to Implant Placement in the Posterior Atrophic Mandiblemore
by Joseph Nissan and Oded Ghelfan
Publication Date: 2011
Publication Name: Clinical Implant Dentistry and Related Research
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PURPOSE: The present study was designed to compare the long-term outcome and complications of cemented versus screw-retained implant restorations in partially edentulous patients.MATERIALS AND METHODS: Consecutive patients with bilateral... more
PURPOSE: The present study was designed to compare the long-term outcome and complications of cemented versus screw-retained implant restorations in partially edentulous patients.MATERIALS AND METHODS: Consecutive patients with bilateral partial posterior edentulism comprised the study group. Implants were placed, and cemented or screw-retained restorations were randomly assigned to the patients in a split-mouth design. Follow-up (up to 15 years) examinations were performed every 6 months in the first year and every 12 months in subsequent years. The following parameters were evaluated and recorded at each recall appointment: ceramic fracture, abutment screw loosening, metal frame fracture, Gingival Index, and marginal bone loss.RESULTS: Thirty-eight patients were treated with 221 implants to support partial prostheses. No implants during the follow-up period (mean follow-up, 66 ± 47 months for screw-retained restorations [range, 18 to 180 months] and 61 ± 40 months for cemented restorations [range, 18 to 159 months]). Ceramic fracture occurred significantly more frequently (P < .001) in screw-retained (38% ± 0.3%) than in cemented (4% ± 0.1%) restorations. Abutment screw loosening occurred statistically significantly more often (P = .001) in screw-retained (32% ± 0.3%) than in cement-retained (9% ± 0.2%) restorations. There were no metal frame fractures in either type of restoration. The mean Gingival Index scores were statistically significantly higher (P < .001) for screw-retained (0.48 ± 0.5) than for cemented (0.09 ± 0.3) restorations. The mean marginal bone loss was statistically significantly higher (P < .001) for screw-retained (1.4 ± 0.6 mm) than for cemented (0.69 ± 0.5 mm) restorations.CONCLUSION: The long-term outcome of cemented implant-supported restorations was superior to that of screw-retained restorations, both clinically and biologically.