Institut Perubatan & Pergigian Termaju - Tesis

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Browsing Institut Perubatan & Pergigian Termaju - Tesis by Subject "940 nm diode laser"

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    The Effects Of 940 Nm Diode Laser On Morphology And Temperature Of Human Extracted Teeth
    (2018-06)
    Ahmed Ghazal, Rehab Mahmoud
    Tooth sensitivity is a totally common dental condition that could cause a huge obstacle for dentist and patient, due to the short, sharp pain arising as a response to stimulation applied on uncovered dentine. The aim of this investigation is to evaluate the effectiveness of 940 nm diode laser as a treatment modality for dentine hypersensitivity. The laser is expected to cause ultrastructural changes of dentine such as narrowing and plugging the wide dentinal tubules. The safest parameters to be used on the dental tissues to provoke the melting of dentine layer without damaging the pulp tissue by heat will be defined. Seven sound, caries free upper premolar teeth with two roots were collected. The teeth were extracted for orthodontic purpose or periodontal disease. Dentine surface were irradiated with a 940 nm diode laser at different output power settings: 1.5 W, 2.0 W and 2.5 W, continuously for 10 seconds. Each tooth had been divided into 4 groups: Group A (control), Group B (1.5 W), Group C (2.0 W) and Group D (2.5 W). Diode laser irradiations at 2.0 W and 2.5 W led to effectively narrowing or sealing of dentinal tubules without provoking carbonisation or any destruction on the dentine surface. Samples that had been irradiated with 1.5 W showed partially narrowing of the dentinal tubules. The pulp temperature increased during irradiation, within a range of 2.6°C to 7.3°C. The temperature increment for all samples was statistically significant (p-value < 0.001). From this study, it is observed that irradiation of 940 nm diode laser at 2.0 W and 2.5 W settings, for 10 seconds in a continuous mode, is able to seal the dentinal tubules. Additionally, these parameters are within the safe range as assessed by the morphology and changes in temperature of the samples, which will not cause a harmful effect to the pulp tissues, and could be effective in the treatment of dentinal hypersensitivity.