球帽固位下颌双种植体覆盖义齿修复效果的前瞻性研究

目的 评价球帽固位的下颌双种植体覆盖义齿的临床修复效果及其修复并发症。 方法 对下颌牙槽骨重度萎缩的10例无牙颌患者,在前牙区与中线等距平行植入2枚种植体,3个月后采用球帽附着体固位方式制作下颌种植覆盖义齿。在覆盖义齿戴入后1周、1年、2年、3年进行随访,评价种植体边缘骨吸收情况、种植体周围软组织健康状况、患者满意度及义齿并发症情况。 结果 10例两球帽固位的下颌种植覆盖义齿经过3年观察,种植体存留率100%,边缘骨吸收<1 mm,种植体周围软组织健康,患者满意度显著提高且维持稳定,义齿无重衬或折断现象,义齿并发症主要是球帽附着体O型圈的置换或固位金属簧的固位力再激活,修理频次0.67次/(年·人)。 结论 在种植体植入位置、方向合适的情况下,球帽附着体固位的下颌双植体覆盖义齿,可获得长期稳定的临床修复效果。     

按扣型附着体下颌种植覆盖义齿咀嚼效率比较

目的：观察不同支持形式的下颌按扣型附着体种植体覆盖义齿的咀嚼效率。方法：8名患者下颌两侧颏孔之间各植入6个种植体。种植体骨结合后,制作下颌覆盖义齿,分阶段安装太极扣附着体阳性部件。测试2种植体覆盖义齿,4种植体覆盖义齿和6种植体覆盖义齿的咀嚼效率。并进行比较分析。结果：对于采用具有垂直运动的万向绞链按扣型附着体作为连接装置的种植体覆盖义齿,4种植体和6种植体覆盖义齿的咀嚼效率高于2种植体覆盖义齿。6种植体覆盖义齿咀嚼效率与4种植体覆盖义齿咀嚼效率比较无差别。结论：采用上述连接装置,4个以上种植体用于固位、支持和稳定覆盖义齿,可以提高患者的咀嚼效率。     

The influence of resilient liner and clip attachments for bar‐implant‐retained mandibular overdentures on opposing maxillary ridge. A 5‐year randomised clinical trial

This study aimed to compare the influence of resilient liner and clip attachments for bar‐implant‐retained mandibular overdentures on opposing maxillary ridge after 5 years of denture wearing. Thirty edentulous male patients (mean age 62·5 years) received two implants in the anterior mandible after being allocated into two equal groups using balanced randomisation. After 3 months, implants were connected with resilient bars. New maxillary complete dentures were then constructed, and mandibular overdentures were retained to the bars with either clips (group I, GI) or silicone resilient liners (group II, GII). The prosthetic and soft tissue complications of the maxillary dentures were recorded 6 months (T_6 m), 1 year (T1), 3 years (T3) and 5 years (T5) after overdenture insertion. Traced rotational tomograms were used for measurements of maxillary alveolar bone loss. The proportional value between bone areas and areas of reference not subject to resorption was expressed as a ratio (R). Change in R immediately before (T0) and after 5 years (T5) of overdenture insertion was calculated. Maxillary denture relining times and frequency of flabby anterior maxillary ridge occurred significantly more often in GI compared with GII. The change of R in anterior part of maxilla was significantly higher than change of R in posterior part in both groups. GI showed significant resorption of anterior residual ridge compared with GII. Relining times and frequencies of flabby ridge were significantly correlated with change in R. Within the limitations of this study, resilient liner attachments for bar‐implant‐retained mandibular overdentures are associated with decreased resorption and flabbiness of maxillary anterior residual ridge and fewer maxillary denture relining times when compared with clip attachments.