Oper Dent. 2017 Nov/Dec;42(6):616-625. doi: 10.2341/16-146-L. Epub 2017 Oct 4.
To compare radiopacity and porosity as expressed by the presence of voids in restorations carried out using bulk-fill and incremental filling techniques to restore large mesio-occlusal-distal (MOD) cavities.
Fifty-five molars with MOD preparations were incrementally filled with Filtek Z-350XT (Z350XT) or bulk-fill composite: Filtek Bulk Fill/Z-350XT (FBF/Z350XT), Venus Bulk Fill/Charisma Diamond (VBF/CHA), SDR/Esthet-X HD (SDR/EST-X), Tetric EvoCeram Bulk Fill (TEC). Digital radiographic images (Vistascan scanner) were taken of restored molars and analyzed at the gingival and isthmus floors. Radiodensity measurements were performed using standardized points symmetrically distributed over each region of composite and tooth structure. Three calibrated evaluators visually assessed the presence of voids. Confidence intervals were calculated, and data were analyzed using analysis of variance and χ tests.
TEC and VBF/CHA showed significantly higher radiodensities, while the lowest values were observed for FBF/Z350XT and Z350XT. Radiodensity at the cervical regions tended to be greater than that found at the isthmus floor. The lowest incidence of voids was found for VBF/CHA, whereas the incremental insertion technique resulted in the highest rate of voids.
Bulk-fill composite resin demonstrated an adequate level of radiodensity and a reduced presence of voids compared with the incremental filling technique.
比较使用大体积充填和增量充填技术修复的窝洞修复体的射线不透明度和孔隙率（表现为存在空隙）。
用增量充填法 Filtek Z-350XT（Z350XT）或大体积充填复合树脂 Filtek Bulk Fill/Z-350XT（FBF/Z350XT）、Venus Bulk Fill/Charisma Diamond（VBF/CHA）、SDR/Esthet-X HD（SDR/EST-X）、Tetric EvoCeram Bulk Fill（TEC）对 55 颗具有 MOD 制备的磨牙进行增量充填。对修复后的磨牙进行数字射线照相（VistaScan 扫描仪），并在牙龈和峡部进行分析。使用对称分布于复合树脂和牙齿结构各区域的标准化点进行放射密度测量。三位经过校准的评估员对空隙的存在进行了视觉评估。计算了置信区间，并使用方差分析和 χ 检验对数据进行了分析。
TEC 和 VBF/CHA 显示出明显更高的射线密度，而 FBF/Z350XT 和 Z350XT 的值最低。颈部区域的射线密度倾向于大于峡部地板的射线密度。VBF/CHA 的空隙发生率最低，而增量插入技术导致的空隙发生率最高。
与增量充填技术相比，大体积充填复合树脂显示出足够的射线密度和减少的空隙存在。
