Occlusal force transmission by overdenture attachments
Wadsworth VA Center, Los Angeles, Calif. ,USAJournal of Prosthetic Dentistry (Impact Factor: 1.75). 04/1979; 41(3):266-71. DOI: 10.1016/0022-3913(79)90005-2
This investigation utilized a composite photoelastic model to examine the load-transfer characteristics of several overdenture attachments. Tissue bar (Hader and King Connector) and stud (extracoronal) attachments (Rotherman, Gerber, and Ancrofix) were studied. The following observations may provide guidelines for the selection of overdenture attachments. 1. The more retentive tissue bar and extracoronal attachments produced higher stress concentrations. 2. Of the tissue bars tested, the Hader Bar produced less torquing forces on the abutment teeth. 3. The Ancrofix appeared to share the forces of occlusion between abutments and the posterior edentulous regions. 4. It must be emphasized that several other factors will also influence the choice of overdenture attachments, such as the judgment of the dentist, economics with respect to the patient, and the availability of laboratory expertise.
- Journal of Prosthetic Dentistry 06/1980; 43(6):611-617. DOI:10.1016/0022-3913(80)90374-1 · 1.75 Impact Factor
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ABSTRACT: This paper, which is presented in two parts, reviews the work on dental materials published in 1979. Included in Part I are sections on dental biomechanics, fissure sealants, cements, amalgam, composite filling materials, endodontic materials and, for the first time, microleakage. Part II will include sections on impression materials, model, die and investment materials, waxes, acrylic resins, denture base polymers, soft lining materials and tissue conditioners, cast and' wrought dental alloys, ceramics, implants and, finally, corrosion.Journal of Dentistry 10/1981; 9(3):177-209. DOI:10.1016/0300-5712(81)90056-7 · 2.75 Impact Factor
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ABSTRACT: Nine subjects treated with overdentures on osseointegrated implants in the mandible were functionally evaluated before and after treatment. The last recordings were performed 1 yr after treatment. The evaluation comprised a subjective and a clinical examination. Measurements of bite force and of chewing efficiency were also performed. The bite force was measured during gentle biting, biting as when chewing and biting with maximal effort. Almonds were used as test food. All subjects improved subjectively as well as clinically after treatment. The bite force during gentle biting increased on average from 17.3 N before treatment to 24.0 N 1 yr after treatment. A corresponding improvement of biting as when chewing was also found, from on average 24.0 N before to 38.7 N after treatment. The maximal bite force increased from on average 74.6 N at the baseline examination to 131.5 N at the 1-yr follow-up. The chewing efficiency improved from Ci = 4 (Median value) before treatment to Ci = 2.8 (Median value) after treatment. It is concluded that treatment with an overdenture supported by osseointegrated implants in the mandible improves oral function compared to the situation before treatment.Scandinavian journal of dental research 07/1988; 96(3):235-42. DOI:10.1111/j.1600-0722.1988.tb01550.x
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