ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

A clinical trial to treat dental osseous lesions with bioactive glass granules of narrow size range (300 to 360 μm) has been conducted since early spring 1990. This study followed an animal study in which the osseous tissue repair properties of bioactive glass granules of narrow size range and hydroxyapatite granules were compared for up to 2 years of implantation. The therapeutic response to the bioactive glass material exceeded the response to the hydroxyapatite as evidenced by very extensive osteoconduction, as well as the capacity to cause differentiation of osteoprogenitor cells to osteoblasts. The clinical study was started by virtue of the bioactive glass granules of narrow size range eliciting expeditious bone tissue formation throughout a defect. In this clinical study 87 patients and 106 defects were treated. The indications selected were apical resection areas, cystic defects, extraction sites, and defects of the alveolar ridge due to surgery or resorption. After insertion, the particles remained well in place and only small changes in the contours of the restored defects were seen, at the most up to 2 months postinsertion. At 3 months the application sites had fully solidified. Radiographic analysis indicated that the material integrated into the bone tissue, and at 6 months any difference between glass particles and bone tissue had nearly disappeared. The few initial cases with limited clinical results were caused by factors unrelated to the glass granules, mostly the surgical technique. By adapting the surgical technique, no unfavorable clinical results were subsequently experienced. The follow-up, exceeding 3 years, demonstrated that bioactive glass granules of narrow size range constitute a valuable material to aid in the repair of dental bone lesions. (Implant Dent 1993;2:151–156)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

There are three classes of bone-grafting materials based upon the mode of action. Autogenous bone is an organic material and forms bone by osteogenesis, osteoinduction, and osteoconduction. Allografts such as demineralized freeze-dried bone are osteoinductive and osteoconductive and may be cortical and/or trabecular in nature. Alloplasts such as hydroxyapatite and tricalcium phosphate may be synthetic or natural, vary in size, and are only osteoconductive. They can be divided into three types based upon the porosity of the product and include dense, macroporous, and microporous materials. In addition, alloplastic materials may be crystalline or amorphous. These materials have different properties and therefore indications. The use of the three classes of materials in diverse combinations depends upon the size and topography of the bony defect. Small defects or defects with four walls of host bone can be repaired with alloplasts alone or allografts in combination with alloplasts. The loss of three or more bony walls mandates the addition of autogenous bone to the graft or the use of a small pore membrane. The larger the defect, the more autogenous bone is required. The different indications of bone substitutes are discussed as to their specific applications in implant dentistry. (Implant Dent 1993;2:158–167)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Three-dimensional finite element analyses were conducted on the four-abutment Hader bar to determine mechanical properties with respect to bar length, stiffener height, and material properties. Three stiffener heights (1, 2, and 3 mm) were analyzed representing a clinical range of usage. Three material types were studied which represent a selection of alloys commonly used clinically. The model consisted of a representative Hader bar of 1.8-mm diameter with a 1-mm inferior stiffener. The ends of the bar were fixed to a 5-mm diameter coping which was attached to a 3.8-mm root form-type implant fixed in a representative block of bone. The bone was modeled as fixed at its distal end to eliminate rigid body motion. A 200 Newton occlusal force was imposed on the mesial bar and a 450 Newton force on the distal bar for the three stiffener heights. The results of these analyses predicted yielding and fracture (failure) for all 1-mm stiffener height and type IV gold alloy cases studied. Stiffener height was found to play a strong role in the adequacy of the overall design as compared with changing material properties in the range of alloy stiffness tested. Factors of safety with respect to static yield strength ranged from 1.44 to 2.12 on the distal portion. (Implant Dent 1993;2:171–176)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Adolescent patients with partial anodontia can benefit from fixed implant treatment. Coordinated multispecialty treatment of a young patient is presented and treatment implications are discussed. (Implant Dent 1993;2:179–181)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

A retained root and a single root form implant were used to support individual crowns to restore a mandibular molar after hemisection. A favorable ratio was achieved between the restoration and the root form implant. (Implant Dent 1993;2:182–184)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

The restoration of anterior buccally placed implants in an edentulous mandible, one of which extended into the movable mucosa of the patient's lip, is presented. CeraOne abutments and anterior Rothermann resilient overdenture attachments were used to retain the prosthesis. (Implant Dent 1993;2:186–188)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Maxillary and mandibular traumatic injuries are inevitable in our society. Dental implants can be considered for the replacement of teeth lost as a result of trauma, even in complicated cases where associated injuries, such as jaw fractures and bone loss, have occurred. Reimbursement for dental services by insurance companies in the case of traumatic injuries to the teeth and supporting structures is discussed. (Implant Dent 1993;2:191–193)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Repositioning the inferior alveolar neurovascular bundle is a high risk procedure which can result in permanent damage. It must be justified by the need for posterior mandibular support to stabilize the dentition and provide function. A clinical report is presented. (Implant Dent 1993;2:195–197)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID