Int J Prosthodont. 2020 Nov/Dec;33(6):656-662. doi: 10.11607/ijp.6709.
To investigate the effect of aging on the morphology of the interface between monolithic implant crowns and standardized titanium base abutments.
Four groups of hybrid abutment crowns differing in restorative material (lithium disilicate [LD] or polymer-infiltrated ceramic network [PICN]) and in fabrication procedure of the interfacial zone for luting to a titanium abutment (milled during CAD/ CAM procedure [M] or prefabricated [P]) were formed: LDS-M, LDS-P, PICN-M, and PICN-P (n = 10 each). The morphology of the crown-abutment interface was examined before and after artificial aging using scanning electron microscopy. The total gap length per specimen was measured at both time points, and intergroup (Kruskal-Wallis [KW]) plus pairwise (Wilcoxon Mann-Whitney [WMW]) comparisons were performed (α = .05).
Before aging, statistically significant differences in gap length were identified among groups (KW: P = .0369) for PICN-P > LDS-P (WMW: P = .0496) and LDS-M > LDS-P (WMW: P = .0060). The effect of aging among the groups, expressed as an increment of total gap length, was 50% in LDS-M, 30% in LDS-P, 20% in PICN-M, and 30% in PICN-P. After aging, the statistically significant differences in gap length identified among groups (KW: P = .0048) were for PICN-P > LDS-P (WMW: P = .0134); LDS-M > PICN-M (WMW: P = .0204); PICN-P > PICN-M (WMW: P = .0486); and LDS-M > LDS-P (P = .0022). However, comparison of the difference in gap length from before to after aging among the groups was not statistically significant (KW: P = .3549).
The cementation interfaces of CAD/CAM crowns on standardized titanium base abutments demonstrated a high percentage of gaps before and after thermomechanical loading. The composition of the restorative material and the nature of the interface influenced the interfacial gap dimension.
研究老化对整体式种植体冠与标准化钛基基台之间界面形态的影响。
形成了四组不同修复材料（锂硅二硅酸盐[LD]或聚合物渗透陶瓷网络[PICN]）和用于将界面粘接到钛基台的界面区域的制造工艺（在 CAD/CAM 过程中铣削[M]或预制[P]）的混合基台冠：LDS-M、LDS-P、PICN-M 和 PICN-P（每组各 10 个）。使用扫描电子显微镜在人工老化前后检查冠-基台界面的形态。在这两个时间点测量每个标本的总间隙长度，并进行组间（Kruskal-Wallis[KW]）加成对（Wilcoxon Mann-Whitney[WMW]）比较（α=.05）。
在老化前，各组之间的间隙长度存在统计学差异（KW：P =.0369），PICN-P > LDS-P（WMW：P =.0496）和 LDS-M > LDS-P（WMW：P =.0060）。各组之间老化的影响，表现为总间隙长度的增加，在 LDS-M 中为 50%，在 LDS-P 中为 30%，在 PICN-M 中为 20%，在 PICN-P 中为 30%。老化后，各组之间的间隙长度存在统计学差异（KW：P =.0048），PICN-P > LDS-P（WMW：P =.0134）；LDS-M > PICN-M（WMW：P =.0204）；PICN-P > PICN-M（WMW：P =.0486）；LDS-M > LDS-P（P =.0022）。然而，各组从老化前到老化后的间隙长度差异的比较没有统计学意义（KW：P =.3549）。
标准化钛基基台 CAD/CAM 冠的粘固界面在热机械加载前后显示出较高比例的间隙。修复材料的组成和界面的性质影响界面间隙尺寸。
