Heat Transfer Behavior across the Dentino-Enamel Junction in the Human Tooth.
During eating, the teeth usually endure the sharply temperature changes because of different foods. It is of importance to investigate the heat transfer and heat dissipation behavior of the dentino-enamel junction (DEJ) of human tooth since dentine and enamel have different thermophysical properties. The spatial and temporal temperature distributions on the enamel, dentine, and pulpal chamber of both the human tooth and its discontinuous boundaries, were measured using infrared thermography using a stepped temperature increase on the outer boundary of enamel crowns. The thermal diffusivities for enamel and dentine were deduced from the time dependent temperature change at the enamel and dentine layers. The thermal conductivities for enamel and dentine were calculated to be 0.81 Wm-1K-1 and 0.48 Wm-1K-1 respectively. The observed temperature discontinuities across the interfaces between enamel, dentine and pulp-chamber layers were due to the difference of thermal conductivities at interfaces rather than to the phase transformation. The temperature gradient distributes continuously across the enamel and dentine layers and their junction below a temperature of 42°C, whilst a negative thermal resistance is observed at interfaces above 42°C. These results suggest that the microstructure of the dentin-enamel junction (DEJ) junction play an important role in tooth heat transfer and protects the pulp from heat damage.
Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.|Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.|Stomatology Hospital of Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi, China.
Lin
L
Niu
Stomatology Hospital of Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi, China.
Shao-Jie
SJ
Dong
Stomatology Hospital of Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi, China.
Ting-Ting
TT
Kong
State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
Rong
R
Wang
Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.|Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.|Stomatology Hospital of Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi, China.
Rui
R
Zou
State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
Qi-Da
QD
Liu
J Biophotonics. 2013 Apr;6(4):330-7
22815209
Dent Mater. 2010 Jun;26(6):501-13
20303579
J Dent. 2006 Mar;34(3):214-20
16087287
Quintessence Int. 1993 Sep;24(9):606-17
8272499
Arch Oral Biol. 2007 Mar;52(3):218-27
17109811
Int Endod J. 2013 Sep;46(9):841-6
23480124
J Am Dent Assoc. 1956 Nov;53(5):577-83
13366579
Int Endod J. 2008 Mar;41(3):204-10
18081809
Arch Oral Biol. 2011 Sep;56(9):846-54
21411060
J Hum Evol. 2007 Jan;52(1):103-11
16997355
Biomaterials. 2007 Jun;28(18):2908-14
17367851
J Dent. 2008 Aug;36(8):588-94
18547708
J Prosthet Dent. 2003 Nov;90(5):447-51
14586308
J Biomech. 2015 Feb 26;48(4):681-6
25597812
J Dent Res. 1970 Jul-Aug;49(4):752-5
5269374
J Mech Behav Biomed Mater. 2011 Jul;4(5):785-95
21565726
J Dent Res. 1954 Aug;33(4):511-8
13184040
J Endod. 2014 Nov;40(11):1835-9
25172227
J Biomed Mater Res A. 2003 Jul 1;66(1):103-9
12833436
Saudi Dent J. 2015 Apr;27(2):63-9
26082571
J Dent Res. 1964 May-Jun;43:315-22
14159034
Arch Oral Biol. 2008 Mar;53(3):261-72
18037388