Browse > Article
http://dx.doi.org/10.5933/JKAPD.2019.46.4.392

Evaluation of the Changes in Polymerization of TheraCal LC with Various Light-curing Time and Distance  

Bae, Sangyong (Department of Pediatric Dentistry, College of Dentistry, Wonkwang University)
Lee, Jewoo (Department of Pediatric Dentistry and Research Institute of Dental Education, College of Dentistry, Wonkwang University)
Ra, Jiyoung (Department of Pediatric Dentistry and Research Institute of Dental Education, College of Dentistry, Wonkwang University)
Publication Information
Journal of the korean academy of Pediatric Dentistry / v.46, no.4, 2019 , pp. 392-399 More about this Journal
Abstract
The purpose of this study was to evaluate polymerization of TheraCal LC, one of the tricalcium silicate cements. To measure the Vickers hardness number (VHN), the specimens were cured at different light curing time and distance. As a result, the VHN of the upper surface was significantly higher than the lower surface's in all groups (p < 0.05). The VHN of the lower surface was increased significantly with the increase of the light curing time in all distance (p < 0.05). When the distance was more than 4.0 mm at all light curing time, the VHN of lower surface was significantly decreased (p < 0.05). When the specimen was light cured for 20 seconds, the VHN of the lower surface did not exceed 2, which corresponds to 10% of the upper surface's. These results suggested that the 20 second light curing time was not sufficient to polymerize the lower surface under specific conditions and that light-curing time should be increased.
Keywords
Polymerization; Vickers hardness; Tricalcium silicate cement;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Andersen M, Lund A, Andreasen JO, Andreasen FM, et al.: In vitro solubility of human pulp tissue in calcium hydroxide and sodium hypochlorite. Endod Dent Traumatol , 8:104-108, 1992.   DOI
2 Cox CF, Subay RK, Suzuki SH, et al.: Tunnel defects in dentin bridge: their formation following direct pulp capping. Oper Dent , 21:4-11, 1996.
3 Andreasen JO, Farik B, Munksgaard EC : Long-term calcium hydroxide as a root canal dressing may increase risk of root fracture. Dent Traumatol, 18:134-137, 2002.   DOI
4 Tray MJ : Pulp protection under restorations-do you need a liner? Austra Endod J , 24:104-108, 1998.   DOI
5 Dammaschke T, Gerth HU, Zuchner H, Schafer E : Chemical and physical surface and bulk material characterization of white ProRoot MTA and two Portland cements. Dent Mater , 21:731-738, 2005.   DOI
6 Torabinejad M, Hong CU, McDonald F, Pitt Ford TR : Physical and chemical properties of a new root-end filling material. J Endod , 21:349-353, 1995.   DOI
7 Camilleri J : Color stabillity of white mineral trioxide aggregate in contact with hypochlorite solution. J Endod , 40:436-440, 2014.   DOI
8 Gandolfi MG, Siboni F, Prati C : Chemical-physical properties of TheraCal, a novel light-curable MTA-like material for pulp capping. Int Endod J , 45:571-579, 2012.   DOI
9 Lee H, Shin Y, Song JS, et al.: Comparative study of pulpal response to pulpotomy with ProRoot MTA, Retro MTA, and TheraCal in dog's teeth. J Endod , 41:1317-1324, 2015.   DOI
10 Bortoluzzi EA, Niu LN, Tay FR, et al.: Cytotoxicity and osteogenic potential of silicate calcium cements as potential protective materials for pulpal revascularization. Dent Mater , 31:1510-1522, 2015.   DOI
11 Bouschlicher MR, Rueggeberg FA, Wilson BM : Correlation of bottom-to-top surface microhardness and conversion ratios for a variety of resin composite compositions. Oper Dent , 29:689-704, 2004.
12 Hilton TJ : Keys to clinical success with pulp capping: a review of the literature. Oper Dent , 34:615-625, 2009.   DOI
13 Bakhtiar H, Nekoofar MH, About I, et al.: Human pulp responses to partial pulpotomy treatment with TheraCal as compared with Biodentine and ProRoot MTA: a clinical trial. J Endod , 43:1786-1791, 2017.   DOI
14 Gopika GJ, Ramarao S, Vezhavendhan N, et al.: Histological evaluation of human pulp capped with light-cured calcium based cements: a randomized controlled clinical trial. Int J Sci Rep , 3:120-127, 2017.   DOI
15 Fujisawa S, Kadoma Y, Komoda Y : Changes in 1H-NMR chemical shifts of Bis-GMA and its related methacrylates induced by their interaction with phosphatidylcholine/cholesterol liposomes. Dent Mater J , 10:121-127, 1991.   DOI
16 Gerzian TM, Hume WR : Diffusion of monomers from bonding resin-resin composite combinations through dentine in vitro. J Dent , 24:125-128, 1996.   DOI
17 Deutsch AS, Musikant BL : Morphological measurements of anatomic landmarks in human maxillary and mandibular molar pulp chambers. J Endod , 30:388-390, 2004.   DOI
18 Khojastepour L, Rahimizadeh N, Khayat A : Morphologic measurments of anatomic landmarks in pulp chambers of human first molars: a study of bitewing radiographs. Iran Endod J , 2:147-151, 2008.
19 Phillips RW : Skinner's science of dental materials, 8th ed. Philadelphia, Saunders, 230, 1982.
20 Rueggeberg FA, Jordan DM : Effect of light-tip distance on polymerization of resin composite. Int J Prosthodont, 6:364-370, 1993.
21 Shimokawa CAK, Turbino ML, Price RB, et al.: Effect of light curing units on the polymerization of bulk fill resin-based composite. Dent Mater , 34:1211-1221, 2018.   DOI
22 Diamanti E, Mathieu S, About I, et al.: Endoplasmic reticulum stress and mineralization inhibition mechanism by the resinous monomer HEMA. Int Endod J , 46:160-168, 2013.   DOI
23 Tate WH, Porter KH, Dosch RO : Successful photocuring: don't restore without it. Oper Dent , 24:109-114, 1999.
24 Uhl A, Mills RW, Jandt KD : Photoinitiator dependent composite depth of cure and Knoop hardness with halogen and LED light curing units. Biomaterials , 24:1787-1795, 2003.   DOI
25 Ota K, Kopel HM, Thanos CE, et al.: Effect of light exposure time on the depth of curing in various composite resin system. Pediatr Dent , 7:19-22, 1985.
26 Atmadja G, Bryant RW : Some factors influencing the depth of cure of visible light-activated composite resins. Aust Dent J , 35:213-218, 1990.   DOI
27 Shimokawa CA, Turbino ML, Price RB, et al.: Light output from six battery operated dental curing lights. Mater Sci Eng C Mater Biol Appl , 69:1036-1042, 2016.   DOI
28 Mahant RH, Chokshi S, Mahant P, et al.: Comparison of the amount of temperature rise in the pulp chamber of teeth with QTH, second and third generation LED light curign units: an in vitro study. J Lasers Med Sci , 7:184-191, 2016.   DOI
29 Torno V, Soares P, Veira S, et al.: Effects of irradiance, wavelength, and thermal emission of different light curing units on the Knoop and Vickers hardness of a composite resin. J Biomed Mater Res B Appl Biomater , 85:166-171, 2008.   DOI
30 Kurachi C, Tuboy AM, Magalhaes DV, Bagnato VS : Hardness evaluation of a dental composite polymerized with experimental LED-based devies. Dent Mater , 17:309-315, 2001.   DOI
31 International Organization for Standardization. ISO 4049: 2009 (E) Polymer-based restorative materials: depth of cure, class 2.
32 AlShaafi MM, AlQussier A, AlQahtani MQ, Price RB : Effect of mold type and diameter on the depth of cure of three resin-based composites. Oper Dent , 43:520-529, 2018.   DOI