The YAG laser treatment for dentine hypersensitivity has shown a curative efficiency of 92.53%. In cases where Nd:YAG laser was applied with an energy density of 40~45J/cm², irradiation at 42J/cm² was performed continuously 1~5 times for 0.5 seconds each time. The immediate efficiency was 87.55%, the cure rate was 84.65%, and the good rate was 92.53%. In another set of cases, Nd:YAG laser treatment with an energy density of 40~45J/cm² was administered 2~3 times, each for 1 second, achieving effective results without any adverse reactions. The total efficiency reached 95.66%, indicating that using 40~45J/cm² doses for 1 second each is both effective and safe.
Comparing these results with those reported in literature, it is proven that laser treatment for dentine hypersensitivity is successful, with its effects surpassing traditional drug therapy methods. The mechanism behind laser treatment involves the thermal effect on the surface of open dentinal tubules, causing tubular heat coagulation and closure, which immediately achieves high efficiency, thereby accomplishing desensitization and healing. Its long-term effect might be related to promoting secondary dentin formation; the laser's electromagnetic field effect and analgesic effect may also play a role in relieving tooth hypersensitivity pain.
For ineffective treatments and complications, in this group of cases, due to initial lack of experience and misconduct in indications and operation methods, a total of 66 teeth were affected after treatment, accounting for 4.33%. Reasons are complex and may be associated with the following factors: risk of teeth having trauma or deep periodontal pockets simultaneously; moderate tooth wear degree with a wide pressure range, leading to over-irradiation of allergy zones or treating too many teeth at once. Irritable hyperemia pulpitis may occur. If symptoms respond poorly, such as thermal hypersensitivity in affected teeth, treatment can be repeated step by step to adapt; if there's fear during irradiation, intervals between treatments should be adjusted. Therefore, when treating hypersensitive teeth, attention should be paid to the situation, choosing a good opportunity for treatment, adjusting irradiation dose and indications as necessary.
With the rapid development of laser medicine, lasers are increasingly widely used in oral diseases (such as laser pulp treatment, root canal disinfection, periodontal therapy, dental calculus removal, etc.). The clinical application research of Nd:YAG laser in treating tooth hypersensitivity is on the verge of significant development, acknowledged for its affirmation of clinical effectiveness, rapid action, simplicity of method, repeatability after relapse, painless treatment, and no damage to tooth pulp with other characteristics. It provides a new way for treating dentin hypersensitivity, making it worth promoting in application. However, it is important to recognize that there are many aspects of allergic tooth treatment that are not yet mature enough, providing important opportunities for future study and catching up with world standards.