450nm/650nm/980nm/810nm/1064nm Difference in Laser Dentistry

450nm (Blue) Laser Dental Applications

The 450nm blue laser belongs to the visible light band, which is mainly absorbed by hemoglobin and melanin and has a shallow penetration depth (0.5-1mm). It is suitable for light-cured resin filling, photodynamic antibacterial treatment (PDT) with photosensitizer to kill periodontal or root canal bacteria, and superficial soft tissue treatment. Its advantage is that it acts precisely on superficial tissues with few side effects, but it is weak in cutting and hemostasis.

650nm (Red) Laser Dental Applications

The 650nm red laser has a medium depth of penetration (1-2mm) and a strong biostimulatory effect, and is commonly used in low intensity laser therapy (LLLT, such as analgesia, promoting wound healing (e.g. after tooth extraction), and oral ulcer treatment. It can also be used for photodynamic therapy (PDT) to assist periodontitis treatment or caries detection. The wavelength has a very low thermal effect and is safe for non-invasive treatment.

980nm (Near Infrared) Laser Dental Applications

The 980nm near infrared laser has a large penetration depth (several millimeters) and a significant thermal effect, and is suitable for soft tissue surgery (e.g. gingival trimming, ligament removal, hemostatic coagulation, and part of the hard tissue treatment (e.g. caries removal or bone trimming). The advantages are precise surgery, less bleeding, and faster healing, but care should be taken to control the temperature to avoid damage to the pulp or surrounding tissues. The wavelength is widely used in periodontal treatment and implant surgery.

810nm Laser Dental Applications

Semiconductor lasers in the 810nm wavelength band in laser dentistry are widely used in soft tissue surgery (such as gingivoplasty and ligature removal), low-intensity laser therapy (to promote tissue restoration), and teeth whitening adjunctive therapy due to their good tissue penetration and hemoglobin absorption properties. This wavelength can effectively coagulate small blood vessels to achieve hemostasis and reduce postoperative edema, but the power should be strictly controlled (usually 0.5-5W) to avoid thermal damage. Its advantages are high precision, good sterilization effect and can be operated with fiber optics.

1064nm Laser Dental Applications

Lasers are widely used in clinical practice because of their unique tissue interaction properties. The wavelength is in the near-infrared spectral range, with a strong tissue penetration depth (about 2-4mm) and good hemoglobin absorption properties, especially suitable for soft tissue surgery (e.g., gingivoplasty, ligature removal) and hemostatic operations. The working principle is based on selective photothermolysis, which produces a thermal effect through the absorption of water and pigmented tissues, enabling precise cutting and coagulation while minimizing damage to surrounding tissues. In periodontal therapy, the 1064nm laser is effective in removing inflammatory granulation tissue and assisting in tartar removal, but caution should be exercised when used on hard tissues (e.g., dentin) as it may cause an increase in pulpal temperature. Clinical benefits include reduced intraoperative bleeding, reduced postoperative edema and improved healing.

Clinical Applications in Laser Dentistry

before and after

Clinical Advantages of Dental Laser Treatment

• Precision and efficiency to minimize tissue damage : The laser can be focused on a tiny area to precisely remove diseased tissue, reducing damage to healthy teeth or gums.
• less pain :The laser closes off pain signals when it acts on nerve endings, and many procedures (e.g., shallow caries repair, gingivoplasty) may not require anesthesia.
• Strong sterilizing effect, reducing the risk of infection : Kills bacteria in the surgical area and reduces the risk of post-operative infections
• Wide range of applications and therapeutic diversity : Caries treatment:Decay removal. filling preparation. Periodontal disease: removal of infected tissue, sterilization, promotion of gum regeneration. Aesthetic restoration: gum contouring, teeth whitening (e.g. laser bleaching). Soft tissue surgery: ligature correction, biopsy and other operations with less bleeding. Root canal therapy: assist in sterilizing the root canal system
• High safety

About Laser dentistry :

utilizes high-energy lasers to achieve precise and minimally invasive treatments with the advantages of reducing tissue damage
lowering pain and bleeding, efficient sterilization and accelerating healing, etc. lt is especially suitable for caries restoration,

periodontal treatment, gum reshaping and teeth whitening scenarios, its noiseless and vibration-free feature can significantly
enhance patient comfort, especially suitable for children and people with dental anxiety. Despite the high cost of the equipment
and the strict reguirements for operating techniques, laser dentistry excels in reducing the risk of infection and shortening the
recovery time, representing the trend of dental treatment towards greater precision and comfort!