الفهرس 
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Abstract
Periodontal infections are a group of diseases influencing dentition supporting structures. Periodontitis has long been described as an infection-mediated destruction of the tooth’s alveolar bone and soft tissue attachments resulting in gingival bleeding, pocket formation, alveolar bone destruction and finally teeth loss.
Low level laser therapy (LLLT) has been shown to have a stimulatory effect on healing of both soft tissues and jaw bones also ozonated oils are mixture of ozone used as antiseptic for oral application of wounds, gingivitis and herpes simplex.
The present study was designed as a controlled clinical trial. Patients included in this study were 24 young adult smoker patients divided into two groups.
group (1): Compromise 12 patients where a gallium-aluminum-arsenide (GaAlAs) diode low-level laser with continuous emission will be applied on one side only of the mandible for four sessions, two sessions was applied at the same day immediately on one side of mandible after periodontal therapy, the second session after 30-45minutes, the third session and the fourth session was at day four. while other side will be Control group.
group (2): Compromise 12 patients where ozonated olive oil (OOO) will be applied on one side only of the mandible while the other side will have a combination of both (LIL) and (OOO). Ozonated olive oil application was performed after initial and at 7, 14 and 21 days.
CBCT was used to assess the marginal bone height and the bone density was measured for all patients immediately after treatment (base line), 3 and 6 months after treatment to assess the changes in level of crestal bone through follow up period in both groups.
from the results of the present study the following was concluded:
I) Radiometric results:
• Laser group was found to have a statistically significant results than control group.
• Laser with ozonated olive oil group was found to have a statistically significant results than ozonated olive oil group.
II) Densitometric results:
group I:
- After 3 and 6 months: There was a statistically significant difference between (Laser groups) and (control group) groups.
group II:
- After 3 and 6 months: There was a statistically significant difference between (Laser with olive oil group) and (Olive oil group) groups.