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首页> 外文期刊>The Journal of Prosthetic Dentistry >The ovate pontic design: a histologic observation in humans.
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The ovate pontic design: a histologic observation in humans.

机译：卵形桥体设计：在人类中的组织学观察。

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STATEMENT OF THE PROBLEM: Fixed partial dentures with an ovate pontic design contacting the underlying soft tissue may interfere with long-term mucosal health. PURPOSE: The purpose of this study was to examine the clinical and histologic characteristics of the human alveolar ridge mucosa adjacent to an ovate pontic-designed restoration. MATERIAL AND METHODS: Twelve patients requiring maxillary fixed partial dentures (either implant- or tooth-supported) with a pontic site in the premolar or molar region were studied. The pontics had an ovate design and were adapted to the underlying mucosa with tight but noncompressive contact. Patients used Super Floss once a day to clean the infrapontic area. After 12 months, soft tissue biopsy specimens about 3 x 3 mm in size were obtained (1) from the ridge mucosa in contact with the pontic (test site) and (2) from an adjacent uncovered masticatory mucosal area (control site). Histometrically, the thickness of the epithelium and the keratin layer and the height of the connective tissue papillae were measured. Morphometrically, the composition of the connective tissue of the specimens was analyzed in a 200-microm-wide zone immediately subjacent to the epithelium (zone A) and in a 200-microm-wide central connective tissue portion (zone B). A point-counting procedure was used to calculate the relative proportions occupied by collagen, fibroblasts, vascular structures, inflammatory cells, and residual tissue. Differences between the tissue fractions in test and control sites were analyzed with the Wilcoxon signed rank test (.05 level of significance). RESULTS: At 12 months, only 3 pontic sites showed clinical signs of mild inflammation, whereas the other test sites and all control sites appeared healthy. A thinner keratin layer was observed in pontic sites than in control sites (8 microm vs 22 microm). Larger tissue fractions of inflammatory cells were found in pontic sites than in control areas in the zone immediately subjacent to the epithelium. CONCLUSION: Within the limitations of this study, restoring an edentulous space with an ovate pontic supported by adequate oral hygiene measures was not associated with overt clinical signs of inflammation. Histologically, however, this pontic design was associated with a thinner keratin layer and with changes in the composition of the connective tissue compartment subjacent to the epithelium.
机译：问题陈述：带有卵形桥状设计的固定局部义齿接触下面的软组织可能会干扰长期的粘膜健康。目的：本研究的目的是检查邻近卵形桥体设计的修复体的人牙槽黏膜的临床和组织学特征。材料与方法：研究了十二例需要在前磨牙或磨牙区域上有牙桥位的上颌固定局部义齿（种植体或牙齿支撑）的患者。桥体呈卵形设计，并与紧贴但无压触的粘膜下层相适应。患者每天使用Super Floss清洁次牙区域。 12个月后，从与牙桥接触的脊黏膜（测试部位）和（2）从未覆盖的咀嚼粘膜区域（对照部位）获得约3 x 3 mm大小的软组织活检标本。在组织学上，测量上皮和角蛋白层的厚度以及结缔组织乳头的高度。形态学上，在紧邻上皮的200微米宽区域（区域A）和200微米宽中央结缔组织部分（区域B）分析样品的结缔组织组成。计点程序用于计算胶原蛋白，成纤维细胞，血管结构，炎性细胞和残留组织所占的相对比例。用Wilcoxon符号秩检验（.05显着性水平）分析测试部位和对照部位的组织部分之间的差异。结果：在12个月时，只有3个桥状部位显示出轻度炎症的临床体征，而其他测试部位和所有对照部位均显示健康。在桥状部位观察到的角蛋白层比对照部位薄（8微米对22微米）。在桥状部位发现的炎性细胞组织分数要比在紧邻上皮的区域的对照区域大。结论：在本研究的范围内，用适当的口腔卫生措施支持卵形桥体修复缺齿的空间与明显的炎症临床症状无关。然而，从组织学的角度来看，这种桥状设计与较薄的角蛋白层以及毗邻上皮的结缔组织区室组成的变化有关。

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