Результаты поиска

Short (5 and 7 mm long) porous implant in the posterior atrophic mandible: a 5-year report of a prospective study.

PURPOSE: The aim of this ongoing prospective study was to determine the 5-year survival rate of short porous implants in the posterior atrophic mandible. MATERIALS AND METHODS: In 40 partially edentulous patients, 55 short porous implants were placed. The implants used were of two lengths (5 and 7 mm) and two different diameters (4.1 and 5 mm) and were chosen according to the available crestal height and width. The unloaded healing period was 4 months. Twenty-one implants were restored with single crowns, 32 were splinted to the adjacent implant, 2 were used with an overdenture and were follo

Back-scattered electron imaging and elemental analysis of retrieved bone tissue following sinus augmentation with deproteinized bovine bone or biphasic calcium phosphate.

OBJECTIVES: To compare resorption of a synthetic biphasic calcium phosphate (BCP) bone-graft substitute with deproteinized bovine bone (DBB) used for human maxillary sinus augmentation. MATERIALS AND METHODS: Eleven patients underwent bilateral maxillary sinus floor augmentation with DBB in one side and a BCP (40%beta-tricalcium phosphate (beta-TCP) and 60% hydroxyapatite) in the contralateral side. Simultaneously, with the augmentation on each side a microimplant was placed vertically from the top of the alveolar crest penetrating the residual bone and the grafting material. Eight months aft

Multiplanar osteotomy with limited wide margins: a tissue preserving surgical technique for high-grade bone sarcomas.

BACKGROUND: Limb-salvage surgery has been used during the last several decades to treat patients with high-grade bone sarcomas. In the short- and intermediate-term these surgeries have been associated with relatively good function and low revision rates. However, long-term studies show a high rate of soft tissue, implant, and bone-related complications. Multiplanar osteotomy with limited wide margins uses angled bone cuts to resect bone tumors with the goal of complete tumor removal while sparing host tissue although its impact on local recurrence is not known. QUESTIONS/PURPOSES: We determin

Immediate functional loading of an implant-supported fixed prosthesis at the time of ablative surgery and mandibular reconstruction for squamous cell carcinoma.

The authors describe a case of squamous cell carcinoma of the oral cavity managed by ablative surgery, mandibular reconstruction with a fibula free flap, and implant placement during the same session. Immediate functional implant loading, respecting the principles of basal implantology, was performed 48 hours later using a highly rigid, screw-secured fixed prosthesis that served as an external fixator for the implants and grafted bone. Implant loading before external beam radiotherapy improves flap stability, bone consolidation, and quality of life. Functional and esthetic outcomes were evalua

Vertical ridge augmentation using an equine block infused with recombinant human platelet-derived growth factor-BB: a histologic study in a canine model.

This preclinical study evaluated the efficacy of purified recombinant human platelet-derived growth factor (rhPDGF-BB), combined with a novel equine hydroxyapatite and collagen (eHAC) bone block, in providing vertical bone regeneration in critical-size defects simulating localized mandibular alveolar bone atrophy. In addition, the impact of barrier membrane placement in growth factor-mediated bone regeneration was also studied. Bilateral posterior mandibular defects simulating severe localized bony atrophy were created in 12 adult foxhounds following removal of all four mandibular premolars. T

Effect of ridge morphology on guided bone regeneration outcome: conventional tomographic study.

BACKGROUND: This study retrospectively analyzed conventional tomograms to estimate the prognostic value of the cross-sectional ridge morphology on the clinical outcome of guided bone regeneration (GBR). METHODS: Presurgical conventional tomograms of 23 single-implant sites were analyzed retrospectively in 20 patients. All sites had a non-space-making buccal dehiscence defect associated with the subsequently placed dental implant. Simultaneous GBR procedures were performed, and 6-month clinical outcomes were assessed. Measurements at baseline and at the 6-month reentry included defect height (

Maxillary sinus floor elevation using a tissue-engineered bone complex with OsteoBone and bMSCs in rabbits.

OBJECTIVES: To evaluate the effects of maxillary sinus floor elevation by a tissue-engineered bone complex with OsteoBone(trade mark) and bone marrow stromal cells (bMSCs) in rabbits. MATERIAL AND METHODS: Autologous bMSCs from adult New Zealand rabbits were cultured and combined with OsteoBone(trade mark) at a concentration of 20 x 10(6) cells/ml in vitro. Twenty-four animals were used and randomly allocated into groups. For each time point, 16 maxillary sinus floor elevation surgeries were made bilaterally in eight animals and randomly repaired by bMSCs/material (i.e. OsteoBone), material,

Tissue preservation and maintenance of optimum esthetics: a clinical report.

Today, most tooth replacement in the esthetic zone is done using implants placed in a delayed surgical protocol. Unfortunately, this delay can result in loss of both hard and soft tissue during the healing period, necessitating guided tissue regeneration techniques at the time of implant placement. Recent developments with tapered implants have facilitated predictable immediate implant placement, preserving the osseous structure surrounding the socket. Further developments with custom healing abutments can preserve the crestal soft tissues, including the papillae. This article reviews techniqu

Immediate and delayed implant placement into extraction sockets: a 5-year report.

BACKGROUND: As a complement to the earlier reported 3-year results from a prospective multicenter study of immediate and delayed placement of implants into fresh extraction sockets, the 5-year results are reported. PURPOSE: The purpose of this 5-year report was to evaluate the immediate and long-term success of implants placed into fresh extraction sockets, with respect to implant size and type, bone quality and quantity, implant position, initial socket depth, and reason for tooth extraction. MATERIALS AND METHODS: This paper presents the 5-year results of the original 12 centers that parti

Augmentation of the maxillary sinus: a surgical technique.

Specific anatomic and physiologic differences between the maxillary and mandibular arches have presented challenges in restoring the fully or partially edentulous maxilla. These differences include the quality and quantity of available bone at the potential implant site. To address the limitations of the maxillary arch, attempts have been made during the last two decades to improve implant anchorage in this area. Bone grafting techniques and guided bone regeneration have been utilized to augment and improve the maxillary arch. The learning objective of this article is to review the important a

Interpositional bone grafting and Le Fort I osteotomy for reconstruction of the atrophic edentulous maxilla. A two-stage technique.

This study presents the results from ten consecutive patients who, because of insufficient bone volume for conventional implant placement in the maxilla, were treated with an interpositional bone graft and Le Fort I osteotomy. The endosteal implants were placed six months after the osteotomy. A total of 60 screw-shaped titanium implants (Brånemark) were placed, of which three failed to integrate during the six-month healing period. No further implants were lost during the follow-up period, ranging from 15 to 39 months after placement of the implants. All patients received fixed bridges and all

[Experimental study on the osteogenic effect of graphene-coated nickel-titanium memory alloy anchors on acute supraspinatus tendon injuries in rabbits with bone loss].

OBJECTIVE: (1)To reverse design a new type of nickel-titanium(NiTi) memory alloy anchors with graphene coating, and to compare their mechanical properties with those of ordinary titanium alloy anchors, as well as their effects on osteoblast proliferation and osteogenic activity in mice. (2)To evaluate the effect of graphene-coated NiTi memory alloy anchor nail on local osseointegration, bone formation and tendon-bone healing strength after rotator cuff injury with bone loss. METHODS: (1) A novel NiTi shape memory alloy anchor was designed and fabricated, followed by surface modification with …

Influence of peri-implantitis defect angles on morphology and the biocompatibility of the implant surfaces after Er, Cr: YSGG laser therapy: an ex vivo study.

PURPOSE: The key obstacles in peri-implantitis therapy are the decontamination of the previously infected implant surface, surface integrity preservation, and enhanced biocompatibility. All are essential events for positive re-osseointegration. The principal hypothesis is that diverse peri-implantitis defect angles may affect the effectiveness of Er, Cr: YSGG laser therapy in a 3D-printed model of peri-implantitis. The primary objective of this study was to evaluate implant morphological changes through profilometer analysis with atomic force microscopy. The biological response (biocompatibili…

Advances in materials used for minimally invasive treatment of vertebral compression fractures.

Vertebral compression fractures are becoming increasingly common with aging of the population; minimally invasive materials play an essential role in treating these fractures. However, the unacceptable processing-performance relationships of materials and their poor osteoinductive performance have limited their clinical application. In this review, we describe the advances in materials used for minimally invasive treatment of vertebral compression fractures and enumerate the types of bone cement commonly used in current practice. We also discuss the limitations of the materials themselves, and

Совпадение в полном тексте источника
… FIGURE 3 Incorporation of multi-walled CNTs into PMMA bone cement improves cytocompatibility and osseointegration. (A) (a) Transmission electron microscopy image of NC3151 grade multi-walled CNT. … MC-modified bone cement significantly improves the adhesion of preosteoblasts and their proliferation; this promotes good osseointegration between the cement and host bone tissue. …

Is a Modular Pedicle-hemipelvic Endoprosthesis Durable at Short Term in Patients Undergoing Enneking Type I + II Tumor Resections With or Without Sacroiliac Involvement?

BACKGROUND: Functional reconstruction after Enneking Type I + II resections of the pelvis (those involving both the ilium and the acetabulum) is challenging, especially if resection of part of the sacrum is included. To assess the clinical outcomes of a newly designed modular pedicle-hemipelvic endoprosthesis, we performed a preliminary retrospective study on its clinical use in a small group of patients. QUESTIONS/PURPOSES: The purposes of this study were (1) to evaluate in a small case series whether the new endoprosthesis restored lower limb function and lumbopelvic stability in the short

Short term sodium alendronate administration improves the peri-implant bone quality in osteoporotic animals.

OBJECTIVE: The aim of this study was to evaluate the bone repair process at the bone/implant interface of osteoporotic rats treated with sodium alendronate through the analysis of microtomography, real time polymerase chain reactions and immunohistochemistry (RUNX2 protein, bone sialoprotein (BSP), alkaline phosphatase, osteopontin and osteocalcin). MATERIAL AND METHODS: A total of 42 rats were used and divided in to the following experimental groups: CTL: control group (rats submitted to fictitious surgery and fed with a balanced diet), OST: osteoporosis group (rats submitted to a bilateral

Three-year results from a randomised controlled trial comparing prostheses supported by 5-mm long implants or by longer implants in augmented bone in posterior atrophic edentulous jaws.

PURPOSE: To evaluate whether 5-mm short dental implants could be an alternative to augmentation with anorganic bovine bone and placement of at least 10-mm long implants in posterior atrophic jaws. MATERIALS AND METHODS: Fifteen patients with bilateral atrophic mandibles (5 mm to 7 mm bone height above the mandibular canal) and 15 patients with bilateral atrophic maxillae (4 mm to 6 mm bone height below the maxillary sinus), and bone thickness of at least 8 mm, were randomised according to a split-mouth design to receive one to three 5-mm short implants or at least 10-mm long implants in augme

Rehabilitation of the edentulous maxilla complicated by combination syndrome with an implant overdenture: a case report.

The treatment of the edentulous jaws with complete dentures is determined individually and often is unpredictable. Implant-assisted overdentures are a significant improvement over conventional complete dentures in terms of patient comfort and function. Combination syndrome refers to a dramatic exaggeration of maxillary alveolar resorption leading to a more complicated rehabilitation. This article reviews how the edentulous maxilla can be rehabilitated with an implant-assisted overdenture. A case report is presented which utilizes a computer-aided design/computer-aided manufactured milled titan

Augmentation of the floor of the maxillary sinus with recombinant human bone morphogenetic protein-7: a pilot radiological and histological study in humans.

The aim of this study was to evaluate the quantity and quality of bony regeneration after we had used recombinant human bone morphogenetic protein-7 (rhBMP-7 to augment the floor of the maxillary sinus. Nine consecutive patients with bilateral posterior maxillary atrophy who required augmentation of the sinus for interposition of implants were treated simultaneously with rhBMP-7 (Osigraft) with deproteinised bone substitute (0.5 g on the test side) and with deproteinised bone alone (2.0 g on the control side). Computed tomographic images preoperatively, immediately postoperatively, and at 4 mo

Simultaneous sinus-lift and implantation using microthreaded implants and leukocyte- and platelet-rich fibrin as sole grafting material: a six-year experience.

PURPOSE: To assess the relevance of simultaneous sinus-lift and implantation with leukocyte- and platelet-rich fibrin (L-PRF, Choukroun's technique) as sole subsinus filling material. MATERIALS: Twenty-three lateral sinus elevations (SA4 sinus) were performed on 20 patients with simultaneous implant placement. Seven patients were treated with 19 Astra implants (AstraTech, Mölndal, Sweden) and 13 patients with 33 Intra-Lock implants (Intra-Lock Ossean, Boca Raton, FL). L-PRF membranes were used to cover the Schneiderian membrane, the implant tips served as "tent pegs" for the L-PRF-patched sin