The author had applied the Nd-YAG LASER to tooth enamel with sealant to develope the new methods for pit & fissure sealing for promoting the sealant utilizations, 70 samples with 7 groups were measured in hardness with Vickers Hardness Tester and compared the data with each others.
The obtained results were as followings.
1. The hardness were 105.8 ± 17.52 in the group of sealing with light curing methods and 149.8 ± 35.21 in the group of sealing with lasing.(P<0.01)
2. It revealed that the hardness was the lowest as 65.00 ± 31.04 in the group of sealant mixed with the hydroxy apatite powder and lasing.(P<0.01)
3. It was measured that the hardness was 165.7 ± 35.08 in the group of mixture with CaP, collagen and hydroxy apatite powder and 157.2 ± . 35.63 in the group of infra red irradiation on the same compositions.
4. It was revealed that the hardness was 165.7 ± 35.80 in the group of Apatite Wollastonite Glass Ceramic Powder with CaP and collagen with lasing, and it was more than that of traditional light curing sealing method.(P<0.01).5. No difference in hardness has been found in comparing three groups : a group of compound mixed with binder, such as CaP, collagen and hydroxy apatite powder exposed to laser, the same group exposed to infra red light, and the very same group exposed to laser with AWGC powder added.(P>0.05)
6. For the development of the preventive measure - sealant ? more efficient, it´s been considered that organic materials, such as Ca, P and hydroxy apatite or Apatite Wollastonite Glass Ceramic must be developed in a manner of getting as close as possibles to the crystal structure of a teeth along with a proper hardening measure
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