Patients who underwent resection of maxilla due to benign or malignant tumor, or accident will have defect in palatal area. They get retention, support and stability from remaining tissues which are hardly optimal. The advantage of swing-lock attachment design is having multiple contacts on labial and lingual side of the abutment teeth by retentive strut and palatal bracing component. Because the force is distributed equally to abutment teeth, abutment teeth of poor prognosis can be benefited from it. It is also more advantageous to cover soft tissue defects which are hard to reach with conventional prosthesis. A 56-year-old female patient who had undergone a maxillectomy due to malignant melanoma complaining of loose and unstable surgical obturator. Surveyed crowns were placed on #12, 26, and 27. Teeth #11, 21, 22, and 23 had lingual rest seat and #24 had mesial rest seat to improve stability and support of the obturator. This clinical report presents the prosthetic management of a patient treated with obturator on the maxilla using swing-lock attachment to the remaining teeth.
Braces ; Crowns ; Denture Precision Attachment ; Female ; Humans ; Maxilla ; Melanoma ; Middle Aged ; Palatal Obturators ; Prognosis ; Prostheses and Implants ; Tooth

The purpose of this review is to examine the performance of attachments used in implant-supported overdenture (IOD) in both clinical and in vitro settings and report the compiled findings, comparisons, and trends in the research literature. Articles published in PubMed on IOD attachment systems and performance were reviewed. Non-original articles were excluded. For each article included, the type of study, number of implants, number of attachment systems, and study outcome were recorded. Of the 283 articles found, 158 met the inclusion criteria. Ninety-four articles were clinical studies and 64 articles were in vitro studies. Studies on retention were the most common for in vitro studies, and four or more attachment systems were compared in most articles with significant differences in outcome. A clinical outcome of one attachment system was most common for clinical studies, while most studies had neutral outcomes overall. Ball attachment was the most commonly tested IOD attachment system. The trend in the literature showed that there is a large discrepancy between the study designs and outcomes between the clinical and the in vitro studies for IOD. Further clinical studies that can validate in vitro research should be encouraged to address this discrepancy between the two areas.
Dental Implants ; Denture Precision Attachment ; Denture, Overlay ; Retention (Psychology)

A 3D finite element model of bilateral distal-extension edentulous dentition, which includes mandible, incisors, canines and premolars, was established in the first place. Based on it, another model with extra-coronal attachments and dentures was also developed. Moreover, contact elements were applied to the regions between the denture and alveolar bone. The von Mises stress distributions of the abutments and their periodontal tissues, edentulous alveolar bone in the two models were compared. The results indicate that the stresses in the abutments and the alveolar sockets obviously increase at the buccal and lingual sides after reparation, and that the stresses on the edentulous alveolar bone also increase.
Dental Abutments ; Dental Stress Analysis ; Denture Design ; Denture Precision Attachment ; Finite Element Analysis ; Humans ; Models, Biological ; Periodontium ; physiology

From alveolar bone and the complete dentition CT images, a three-dimensionalysis of nonlinear finite element model of mandibular unilateral distal-extension with extracoronal precision attachment was established. The contact elements were used between the denture and alveolar bone. The result shows that, the stress in the second premolar and periodontal tissue decreased obviously as the second abutment was added. However, the stress difference was unapparent as the third abutment was added. Considering various facts, the attachment with two abutments was suggested to be used. With the decrease of the periodontal tissue, the stress in the periodontal tissue increased, however the stress in the tooth changed slightly. Thestress in the periodontal tissue decreased effectively when the third abutment was added, as the tooth root was absorbed by 50%. In this situation, the extracoronal precision attachment can also be used.
Dental Stress Analysis ; Denture Precision Attachment ; Denture, Partial, Removable ; Finite Element Analysis ; Humans ; Imaging, Three-Dimensional ; methods ; Mandible ; diagnostic imaging ; physiology ; Models, Biological ; Tomography, X-Ray Computed

Denture Precision Attachment ; Humans ; Tooth Loss ; therapy

Denture Precision Attachment ; classification ; Humans

Dental Caries ; etiology ; therapy ; Denture Precision Attachment ; Denture Retention ; Humans ; Periapical Periodontitis ; etiology ; therapy ; Periodontitis ; etiology ; therapy ; Pulpitis ; etiology ; therapy

Denture Design ; Denture Precision Attachment ; Humans

OBJECTIVEIn order to compare the influence of casting and laser welding on magnetic retentive force, the magnetic retentive forces of laser-melted and cast post-keepers of the magnetic attachments were measured in vitro.

METHODS5 cast and 6 laser-melted post-keeper specimens (Magfit MD800) were formed, respectively. Using untreated keeper as control group, the vertical magnetic retentive forces were measured by a universal testing machine.

RESULTSThe average vertical magnetic retentive force of the laser-melted post-keeper group and the cast post-keeper group in vitro were (4.223 +/- 0.217,0)N, (3.792,9 +/- 0.296,4)N, respectively. Compared with the cast post-keeper group, the average vertical magnetic retentive force of the laser-melted post-keeper groups was much higher in vitro (P < 0.05).

CONCLUSIONLaser welding had less influence on the magnetic retentive force of the magnetic attachments than casting.

Dental Alloys ; Dental Casting Investment ; Dental Casting Technique ; Dental Prosthesis Retention ; instrumentation ; Dental Soldering ; methods ; Denture Precision Attachment ; Electromagnetic Fields ; Lasers ; Magnetics ; instrumentation ; Post and Core Technique ; Stainless Steel ; Welding ; methods

OBJECTIVEIn order to introduce the laser welding technology into root-cap making, this study compared the surface characters and internal structures of laser-melted and cast post-keeper to provide experimental data for clinical application of the technique.

METHODSUsing untreated keeper as the control group, the surface characters and metallographic structures of the keepers were examined by stereomicroscope, metallographic microscope and SEM, and element analysis were conducted with EPMA.

RESULTSThe laser-melted post-keeper basically kept the original smooth and the internal structure of the keeper, the heat reaction zone was extremely small and elements diffused mutually around the fusion zone obviously. While in the cast post-keeper, the surface was rough and had an oxide-layer. The internal structure changed and a fusion band formed between the base alloy and the keeper, but element diffusion was limited to the fusion zone.

CONCLUSIONCompared with casting, laser welding technique demonstrated less influence on the surface and internal structure of the keepers.

Dental Alloys ; Dental Casting Investment ; Dental Casting Technique ; Dental Prosthesis Retention ; instrumentation ; Dental Soldering ; methods ; Denture Precision Attachment ; Electromagnetic Fields ; Hot Temperature ; Lasers ; Magnetics ; instrumentation ; Stainless Steel ; Welding ; methods