Influence of curing modes on the degree of conversion and mechanical parameters of dual-cured luting agents |
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| Institution: | 1. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, 56 Lingyuan West Road, Guangzhou 510055, China;2. Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis 55455, USA;3. State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi’an 710032, China;1. W White Dental Clinic, 17, Teheran-ro 87-gil, Gangnam-gu, Seoul, 06169, Republic of Korea;2. Doctorplant Dental Clinic, 885 Gyeongin-ro, Yeogdeungpo-gu, Seoul, 07303, Republic of Korea;3. Obokmanse Dental Clinic, 20, Digital-ro 31-gil, Guro-gu, Seoul, 08380, Republic of Korea;4. Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea;1. Division of Oral Reconstruction and Rehabilitation, Kyushu Dental University, Graduate School, Japan;2. Division of Physiology, Kyushu Dental University, Japan;1. Department of Reconstructive Dentistry, University Center for Dental Medicine Basel, Switzerland;2. Department of Restorative Dentistry, School of Dentistry, University of Leeds, United Kingdom;3. Department of Medical Biotechnologies, University of Siena, Italy;4. Department of Prosthodontics & Dental Materials, School of Dental Medicine, University of Siena, Italy;5. Dental Trial Clinical Research Unit [DenTCRU], School of Dentistry, University of Leeds, United Kingdom;1. Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece;2. Department of Operative Dentistry, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece;3. Department of Restorative Dental Sciences, Division of Prosthodontics, University of Florida College of Dentistry, Gainesville, FL, United States;1. State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China;2. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA;3. Departments of Oral Health Sciences, School of Dentistry, University of Washington, Seattle, WA, USA;4. Departments of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, WA, USA;1. Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita 565-0871, Japan;2. Department of Oral Health Sciences, Otemae College, 6-42 Ochayasho-cho, Nishinomiya, Hyogo 6628552, Japan |
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| Abstract: | PurposeTo investigate the effects of different curing modes, including tack cure, on the degree of conversion (DC) and mechanical parameters of dual-cured luting agents for all-ceramic restorations.MethodsImmediate light curing, intermittent light curing (2-s tack cure and a 1-min interval before the main cure), delayed light cuing (2-min delay) and chemical or no light curing were used to cure two dual-cured luting agents, RelyX Unicem and PermaCem 2.0, through a 1.5-mm thick lithium disilicate ceramic slide. DC (n = 3), micro-hardness (n = 5), shrinkage strain (n = 4) and shrinkage stress (n = 3) were measured under the aforementioned curing modes. The data were analyzed using two-way ANOVA and post-hoc Tukey HSD test, with the level of significance set at α = 0.05.ResultsFor both luting agents, all the light-curing modes produced similar final DC, but using chemical cure only could significantly reduce the DC. The mechanical parameters followed a similar pattern. There were positive but nonlinear correlations between DC and the other mechanical parameters, with the increase in these parameters with DC being slower initially.ConclusionsProvided adequate light curing is applied to a dual-cured luting agent, delaying the light curing or using a tack cure first to facilitate seating of a restoration may not have a significant impact on the luting agent’s final degree of conversion. However, using chemical cure only may result in inadequate cure of the luting agent and is recommended only for highly opaque restorations. |
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| Keywords: | Dual-cured luting agents Curing modes Degree of conversion Micro-hardness Shrinkage strain Shrinkage stress |
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