Department of Prosthodontics and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan.
Acta Odontol Scand. 2013 Mar;71(2):307-11. doi: 10.3109/00016357.2012.680903. Epub 2012 May 1.
A maxillary complete denture has been a common prosthetic treatment for people with edentulous maxillas. The fracture and deformation of dentures are recurrent and common problems for denture-wearers. Consequently, reinforcement materials are embedded in the denture base to prevent fracture and deformation. The purpose of this study was to examine the influence of reinforcing materials on the strain within the acrylic base of a maxillary complete denture.
Three reinforcements (cast cobalt-chromium bar; glass fibers; and cobalt-chromium wire) were embedded in the bases and a strain-gauge was attached at three positions (labial, middle and posterior) at the mid-line of the polished surface of each denture. A vertical occlusal load of 49 N was applied to the left and right side in the region of the 1st premolar and the 1st molar. Comparisons of the strain were made via ANOVA.
The strain of the denture base with a cast cobalt-chromium reinforcement was significantly (p < 0.05) smaller than that with the other reinforcements.
This result suggested that a cast cobalt-chromium reinforcement helps to reduce the risk of fracture and deformation of a maxillary complete denture.
全上颌义齿是一种常见的无牙颌患者的修复治疗方法。义齿的折断和变形是义齿佩戴者常见的复发问题。因此，在义齿基托中嵌入增强材料以防止折断和变形。本研究旨在研究增强材料对上颌全口义齿丙烯酸基托内应变的影响。
在基托中嵌入三种增强材料（铸造钴铬棒；玻璃纤维；钴铬丝），并在每个义齿抛光表面中线的三个位置（唇侧、中部和后部）粘贴应变片。在第一前磨牙和第一磨牙区域的左右两侧施加 49N 的垂直咬合载荷。通过方差分析比较应变。
铸造钴铬增强型义齿基托的应变明显小于其他增强型义齿（p < 0.05）。
结果表明，铸造钴铬增强有助于降低上颌全口义齿折断和变形的风险。
