Changes in the edentulous maxilla in persons wearing implant-retained mandibular overdentures
Changes in the edentulous maxilla in persons wearing implant-retained mandibular overdentures
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DOI：
10.1067/mpr.2000.107113
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发表时间：
2000-07-01
影响因子：
4.6
通讯作者：
Kalk, W
中科院分区：
文献类型：
--
作者：
Närhi, TO;Geertman, ME;Kalk, W
问题的陈述。有人认为，在前上颌骨严重吸收的风险增加的人戴下颌种植体固位覆盖义齿。然而，关于下颌种植体治疗后无牙颌上颌骨的变化的信息很少。本研究确定了可能的变化，在上颌残留嵴的宽度6年后，接受下颌种植体支持或种植体粘膜支持覆盖义齿，并评估与上颌全口义齿的解剖变化和主观投诉之间的关联。本研究的受试者（n = 55），在一项前瞻性临床试验的参与者中招募，被随机分配到3组：（a）种植体支持覆盖义齿上的经下颌种植体系统（n = 21）;（B）种植体粘膜支持覆盖义齿上的2个IMZ种植体（n = 20）;或（c）传统的全口义齿（n = 14）。所有受试者的牙齿排列均采用前牙开牙合的舌接触咬合概念。在基线时进行诊断性铸型，并在6年随访时再次进行。垂直于残留牙槽嵴顶部的最突出点位于切牙、尖牙和前磨牙区域，之后用博利规记录这些点处的牙槽嵴宽度。受试者对他们的义齿的意见进行了评估与一个量表。所有测量区域的牙槽嵴宽度均显著减小（平均差异= 0.4至0.6 mm; P
Statement of problem. It has been suggested that risk for severe resorption in the anterior maxilla is increased in persons wearing mandibular implant-retained overdentures. However, little information is available about the changes in the edentulous maxilla after mandibular implant treatment.Purpose. This study determined the possible changes in the width of the maxillary residual ridge 6 years after receiving mandibular implant-supported or implant-mucosa-supported overdentures and evaluated the association between the anatomic changes and subjective complaints with maxillary complete dentures.Methods and material. The subjects for this study (n = 55), enrolled among the participants of a prospective clinical trial, were randomly assigned into 3 groups treated with: (a) implant-supported overdentures on a transmandibular implant system (n = 21); (b) implant-mucosa-supported overdentures on 2 IMZ implants (n = 20); or (c) conventional complete dentures (n = 14). A lingual contact occlusion concept with anterior open bite was used for tooth arrangement in all subjects. Diagnostic casts were made at baseline, and again at the 6-year follow-up. Most prominent points perpendicular to the crest of residual ridge were located in the incisor, canine, and premolar regions, after which the width of the ridge was recorded at these points with a Boley gage. Subjects' opinions on their dentures were evaluated with a questionnaire.Results. Significant reduction in the width of the ridge was found in all measurement areas (mean difference = 0.4 to 0.6 mm; P