Verification of Theoretical Modeling of Heat Transmission in Teeth by in vivo Experiments

Abstract

A theoretical axisymmetric tooth model, simulating the conditions involved in the drinking of a liquid of a certain temperature, was compared with results of a similar in vivo experiment. The temperature changes as a result of one draught of a hot/cold liquid were recorded within the model as well as in the surrounding environment. The experimental data obtained were compared with the calculated results for the theoretical model as determined by the Finite Element Analysis. The temperatures recorded experimentally agreed reasonably with the calculated results. It can be concluded that the assumptions which have been made concerning the described thermal loading conditions lead to a good approximation of the physical reality.

Cuspal movement and microleakage in premolar teeth restored with posterior filling materials of varying reported volumetric shrinkage values

“…Root apices were sealed with sticky wax and all tooth surfaces were sealed with nail varnish, with the exception of a 1 mm band around the margins of each restoration, and the teeth replaced in water when the varnish dried. The specimens were thermocycled between two waterbaths maintained at 65G1 and 4G1 8C, respectively, 15,16 so that the restored teeth were submerged for 10 s with a 25 s transfer from waterbath to waterbath for the time equivalent of 500 cycles. The teeth were then immersed in 0.2% basic fuchsin dye for 24 h and a vertical section was made through each restored tooth mid-sagitally in a mesio-distal plane using a diamond cutting saw (Struers, Glasgow, Scotland) with a ceramic disc operating at a speed of 125 rpm with an applied load of 100 g. Sectioned restorations were examined under a stereo-microscope (Wild M3C, Heerburg, Switzerland) at 25!…”

Modeling the Mechanical Behavior of the Jaws and Their Related Structures By Finite Element (Fe) Analysis

“…One source is the differential coefficient of thermal expansion, leading to a differential volume change. This thermal expansion or contraction may follow the application of heat from any source, such as from dietary sources of hot and cold foods, which may present a temperature variation of about 50°C within a tooth (Spierings et at., 1987). Thermal analyses were carried out for the study of the temperature transmission in teeth (De Vree et al, 1983b;Spierings et al, 1984Spierings et al, , 1986 (Anusavice et al, 1982) and an amalgam-tooth system (Wright and Yettram, 1978).…”

Ağiz Ortaminin Si̇mülasyonu Açisindan Termal Ve Loading Si̇klusun Önemi̇

“…Ancak yeme-içme alıĢkanlıkları kiĢiden kiĢiye farklılık, gösteren alıĢkanlıklardır ve ağızın her bölge-sinde eĢit ısı değiĢimlerine neden olmamaktadır 11 . Ağızdan nefes alınmadığında ve ısısal bir yükleme yapılmadığında ağız içi sıcaklık 35.2(± 2)°C (ortalama 35°C) olarak ölçülmüĢtür 12 . DiĢlerin dıĢ yüzeyindeki ısı değiĢiklikleri, sıcak ve soğuk sıvıların içilmesi süresince ısı ölçerler aracılığı ile ölçülmüĢtür.…”

“…Springs ve arkadaĢları 30 ml olarak belirlenmiĢ sıvı miktarı ile, aynı kiĢide, aynı sıvıyla ve aynı bölgelerde ısı değiĢikliklerini tespit etmiĢler ve üst 1. molar ile 1. premolar diĢlere yerleĢtirdikleri ısıya duyarlı kablolar ile yan yana diĢlerde bile ortalama 4 °C kadar dikkat çekici bir ısı farklılığı olduğunu bildirmiĢlerdir 12 . Diğer yandan en yüksek ısı değerlerine tolerans sınırı, ısı değiĢikliklerinin ölçüldüğü diĢlerin lokalizasyona, diĢeti çekilme miktarına, diĢlerde restorasyon olup olmadığına ve restorasyon varsa hangi çeĢit restorasyon olduğuna göre değiĢmektedir.…”