本研究的目的是探討經各種方法處理過後的牙本質，以及使用雷 射處理後的牙本質表面與複合樹脂間的鍵結強度，並觀察破斷面的情況。 方法是收集人類臼齒，分別以傳統磷酸處理，SE Bond處理與及使 用Nd:YAP雷射處理。再經由微張力測試法來測量各方式的鍵結能力，之後將試片在SEM下來觀察其表面型態及破斷橫截面的情況。 結果得到使用傳統磷酸處理後牙本質與複合樹脂的微張力強度最 大，而使用SE Bond處理之微張力強度與磷酸處理並沒有明顯差異；使用雷射處理後並沒有產生任何鍵結能力。 本研究的結論是當牙本質不同的處理方式會導致表面型態不同， 牙本質開口數目、大小所獲得的鍵結能力也不同。雷射具有封閉牙本質小管開口的能力，卻無法產生任何的鍵結能力。 The main purpose of the present study is to compare the surface condition and bonding strength of dentin surfaces treated with different agents including phosphoric acid etching, self-etching system and laser conditioning. After evaluation of bonding strength with microtensile test, the fracture surface also evaluated with SEM to analysis the mechanism to affect the bonding strength. Human molars without any decay and filling were collected and prepared to get clean and smooth surfaces then the surfaces were treated with phosphoric acid, SE Bond and Nd: YAP laser. After data analysis with one way ANOVA, the bonding strength of phosphoric acid group is the greatest but with no significant difference when compared with SE Bond group. Dentin surfaces treated with Nd: YAP laser fail to produce any data of detectable bonding strength. The conclusions of the present study were as follows: 1) different dentin condition methods can affect the dentin surface conditions like the numbers and diameter of dentin tubules. This phenomenon may change the result of bonding strength. 2) the bonding strengths of phosphoric acid group and SE Bonding group were no statistical difference means that the bonding mechanism of self etching system was not only mechanical but chemical strength. 3) Nd: YAP laser can seal the dentin tubules and produce crack and uneven rough surface. This phenomenon may explain the reason of bonding failure in the laser treating group.
