Knox J, Hubsch P, Jones M L, Middleton J
Departments of Dental Health and Development, University of Wales College of Medicine, Dental School, Heath Park, Cardiff CF4 4XY, UK.
J Orthod. 2000 Sep;27(3):249-54. doi: 10.1179/ortho.27.3.249.
The objectives of the study were to isolate the bracket-cement interface, and to determine the influence of bracket base morphology and orthodontic bonding agent chosen on strength of adhesion. The bracket bases evaluated included 60, 80, and 100 single mesh bases, a double mesh base, and the Dynalock, and Mini Twin bases. The strength of interface provided by each of these bases with Concise, Transbond, Right On, and non-encapsulated Fuji Ortho LC cements, was measured in tension and recorded in Mega Pascals. The single-mesh bases performed well with either Concise or Right On (1188-2272 MPa) and, other than the 80-mesh bracket, relatively poorly with Transbond (218-515 MPa). With Fuji Ortho LC, the single mesh bases performed well (605-1219 MPa). The double mesh base performed well with Right On (1375 MPa), and reasonably well with Concise, Transbond, and Fuji Ortho LC (600-920 MPa). The Dynalock and Mini Twin Bases performed fairly well with all cements (887-17*16 MPa). It was concluded that the orthodontic bonding agent selected would appear to largely determine the bond strength achieved with a particular bracket base design. A definite trend was difficult to identify in this study, and it appeared that certain combinations of bracket base and bonding agent performed optimally. Particular base designs may allow improved adhesive penetration or improved penetration of curing light. Alternatively, the dimension and distribution of resin/cement tags prescribed by one base could promote a stress distribution that is better resisted by a particular adhesive.
本研究的目的是分离托槽 - 粘结剂界面，并确定托槽基底形态和所选正畸粘结剂对粘结强度的影响。评估的托槽基底包括60、80和100目的单网基底、双网基底、Dynalock基底和Mini Twin基底。测量了这些基底与Concise、Transbond、Right On和非封装型Fuji Ortho LC粘结剂形成的界面在拉伸时的强度，并以兆帕为单位记录。单网基底与Concise或Right On粘结剂配合时表现良好（11.88 - 22.72兆帕），除了80目托槽外，与Transbond粘结剂配合时相对较差（2.18 - 5.15兆帕）。使用Fuji Ortho LC粘结剂时，单网基底表现良好（6.05 - 12.19兆帕）。双网基底与Right On粘结剂配合时表现良好（13.75兆帕），与Concise、Transbond和Fuji Ortho LC粘结剂配合时表现也较好（6.00 - 9.20兆帕）。Dynalock和Mini Twin基底与所有粘结剂配合时表现都相当不错（8.87 - 17.16兆帕）。得出的结论是，所选的正畸粘结剂似乎在很大程度上决定了特定托槽基底设计所能达到的粘结强度。在本研究中难以确定明确的趋势，似乎某些托槽基底和粘结剂的组合表现最佳。特定的基底设计可能会改善粘结剂的渗透或固化光的穿透。或者，一种基底规定的树脂/粘结剂标签的尺寸和分布可能会促进应力分布，而特定的粘结剂对此具有更好的抵抗力。
