Primer 预固化和联合固化的影响 ортодонтика支架的剪接强度 使用三种光固化粘合系统: 一个
Shahanamol Vattaparambil1, Muhamed Shaloob2, Vincy Antony1
1Department of Orthodontics and Dentofacial Orthopaedics, MES Dental College, Perinthalmanna, Kerala, India.
The journal of contemporary dental practice
|June 7, 2023
概括
与共同固化相比,初级预固化正统牙科支架提供了优越的剪接强度. 这种方法增强了支架粘附性,并减少了树脂支架接口的故障,改善了正牙治疗结果.
科学领域:
- 矯正牙科 矯正牙科是一種矯正牙科.
- 牙科材料科学 牙科材料科学
- 粘合式牙科 粘合式牙科
背景情况:
- ортодонтика支架粘合依赖于粘合剂系统,初级应用是一个关键的步骤.
- 两种常见的原料固化方法是预固化 (单独暴露于光线) 和共同固化 (与粘合剂同时暴露于光线).
- 固化方法的选择可以影响切键强度 (SBS) 和牙科支架的临床成功.
研究的目的:
- 为了评估和比较 ортодонтических支架的剪接强度 (SBS) 使用原料预固化与共同固化.
- 评估三种不同的光固化粘合剂系统在这些固化条件下对SBS的影响.
主要方法:
- 一项体外研究涉及102个提取的前牙,用不钢支架粘合在一起.
- 根据三种粘合剂系统 (Transbond XT,Orthofix,Enlight) 和两种固化方法 (primer预固化与联合固化) 将牙分为六组.
- 测量了剪接强度 (SBS) 和粘着残留指数 (ARI),然后进行扫描电子显微镜 (SEM) 分析.
主要成果:
- 在各组之间观察到SBS的统计学上显著差异 (ANOVA).
- 与所有测试的粘合剂系统的共同固化相比,原料的预固化导致了更高的平均SBS.
- 经过前固化的Transbond XT表现出最高的平均SBS (20.56 ± 3.22 MPa),而经过共同固化的Orthofix显示出最低的 (7.57 ± 0.49 MPa).
结论:
- 与共同固化相比,初级预固化显著提高了牙科支架的剪接强度.
- 这些发现表明,预固化原料是实现坚固支架粘附的更有效方法.
- ARI和SEM分析证实了SBS结果,表明故障主要发生在树脂支架接口上.
相关概念视频
01:25Accelerated Curing of Concrete
194
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
194
01:12Bonding and Strength of Aggregate
224
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
224
01:20Curing of Concrete
126
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
126
01:20Strength of Cement
175
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
175
01:26Curing Methods
103
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
103
01:20Microcracking in Concrete
159
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
159