| http://www.w3.org/ns/prov#value | - Preferably the body 5 is constructed of a bio-compatible metal, such as stainless steel or titanium or other material, and the rear wall acts as a spring to try to maintain the upper wall and lower wall 15 and 16 in parallel relationship while also functioning as a hinge, when the upper and lower walls 15 and 16 are anteriorly forced apart by application of spreading force to the walls 15 and 16.
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