Development Of A Pulsed Light Emitting Diode Dental Photocuring System

脉冲发光二极管牙科光固化系统的研制

• 批准号: 7214830
• 负责人: JACK X ZHOU
• 金额: $ 30.35万
• 依托单位: B & W TEK, INC.
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-01 至 2008-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7214830
• 关键词: Characteristics; Classification; Collection; Dental; Depth; Development; Devices; Engineering; Evolution; Fluorescence; Food; Generations; Halogens; Hardness; In Situ; Kinetics; Lasers; Light; Marketing; Measures; Mechanics; Methods; Modeling; Monitor; Object Attachment; Optics; Phase; Phase I Clinical Trials; Physiologic pulse; Plant Resins; Play; Polymers; Process; Property; Pulse taking; Rate; Reaction Time; Research Personnel; Resistance; Role; Simulate; Surface; System; Temperature; Thermogenesis; Time; Training; Variant; Width; base; chemical property; day; dental resin; design; desire; improved; novel; photocuring; physical property; polymerization; programs; prototype; quantum; response

DESCRIPTION (provided by applicant): LED based curing lights are beginning to replace conventional halogen lamps as the first choice for dental photo-curing applications. The target of this proposal is to develop a new generation LED dental curing light. It will be the first curing light that is optimized according to the kinetic response of the dental composite, which plays a key role in determining the curing time, the quality of the cured resin, and the heat production. The proposed LED light cures the dental composite by a train of short-duration light pulses, where the time scale of the pulse width and pulse period is designed to match with the response time of the photo-initiation process. This 'resonant' curing mode yields the best quantum efficiency for photo-polymerization. Phase I study of this project leads to successful demonstration of the feasibility and advantages of the proposed pulsed LED light over conventional light curing units (LCUs). It was found that the pulsed LED light yields 10-12% more curing depth and better surface hardness than that obtained by a continuous wave (CW) light with same exposure energy. For phase II project, we will establish a simple but practical model to analyze the kinetic characteristics of the photo-polymerization process and use the model as a guide to help us further explore the potential of the pulsed LED light for dental composite curing. A Raman spectrometer will be utilized in combination with the pulsed LED for real time and in situ monitoring of the photo-polymerization process as to obtain the parameters used in the kinetic model. We will conduct a systematic study on the physical properties of the dental composite cured by both conventional LCUs and the proposed pulsed LED, which will be used to further optimize the pulse sequence. A novel automatic curing time control method employing fluorescence level monitoring at off-time of the pulse train will also be explored. Finally, we will develop a prototype pulsed LED photo-curing system capable of curing all dental polymer resins currently on the market in a time scale comparable to that can be obtained using laser radiation (typically 5-10 seconds) and with a high "quality" of cure in terms of depth of cure, hardness, shrinkage, shear bond strength, and temperature change in the resin.

描述（由申请人提供）：基于LED的固化灯开始取代传统的卤素灯，成为牙科光固化应用的首选。本提案的目标是开发新一代LED牙科固化灯。这将是第一个根据牙科复合材料的动力学响应进行优化的固化光，这在决定固化时间、固化树脂的质量和产热方面起着关键作用。所提出的LED光通过一系列短时间光脉冲来固化牙科复合材料，其中脉冲宽度和脉冲周期的时间尺度被设计为与光引发过程的响应时间相匹配。这种“共振”固化模式为光聚合提供了最佳的量子效率。该项目的第一阶段研究成功证明了所提出的脉冲LED灯相对于传统光固化单元（lcu）的可行性和优势。结果表明，在相同的曝光能量下，脉冲LED光的固化深度比连续波（CW）光的固化深度高10-12%，表面硬度更好。对于二期项目，我们将建立一个简单而实用的模型来分析光聚合过程的动力学特性，并以此模型为指导，帮助我们进一步探索脉冲LED光用于牙科复合材料固化的潜力。拉曼光谱仪将与脉冲LED结合使用，对光聚合过程进行实时和原位监测，以获得动力学模型中使用的参数。我们将对传统lcu和所提出的脉冲LED固化的牙科复合材料的物理性能进行系统研究，并将其用于进一步优化脉冲序列。本文还将探索一种利用脉冲序列非时刻荧光电平监测的新型自动固化时间控制方法。最后，我们将开发一个脉冲LED光固化原型系统，该系统能够在与使用激光辐射（通常为5-10秒）相当的时间内固化目前市场上所有牙科聚合物树脂，并且在固化深度，硬度，收缩率，剪切结合强度和树脂温度变化方面具有高“质量”的固化。