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Background: Radicular cysts are the most common inflammatory odontogenic cyst which can be treated with decompression especially in children with large cyst and has vital structures and or vital tooth.Purpose: to evaluate clinical and radiographic effectiveness of decompression as a conservative treatment in decreasing the size of a pediatric radicular cysts and reveal the effect of different variables such as impacted tooth angulation, cusp tip depth and cyst size on related impacted tooth eruption.Methodology: A healthy 10 children with average age of 9years old with unilateral radicular mandibular cysts. decompression was done incorporating a multipurpose space maintainer. Clinical and radiographic follow up was done.Results: Ten patients were treated by decompression and the volume reduction rate was 79.1%. The monthly reduction rate was better in lesions greater than 275 mm2 with -28.00 ± 20.05and -17.52 ± 7.05 in lesions lower than 275mm2 with statistical significant difference (p<0.05). Conclusion:Decompression is effective for the treatment of radicular cystic lesions in pediatrics as it enables eruption of the impacted teeth within the cyst and decrease morbidity and protects neighboring vital structures.

Aim: Tooth loss can affect the person’s life dramatically. Tooth loss is accompanied by bone loss in all dimensions, so preservation of the bone is mandatory for placement of dental implant. Immediate implant can preserve alveolar bone. Due to difference in shape between the implants and extracted roots a gap appears between the immediately placed implant and the extraction socket resulting in jumping distance, Bone grafts are commonly used to fill this gap, recent studies suggest that jumping gaps shouldn’t always be grafted. Low level bio stimulation has stimulatory effect on bone cells so it can be used in immediate implants to increase bone formation around the implants. Materials and methods: this study was carried in the hospital of future university. A total of twelve patients with non-restorable mandibular molar participated in this study. A total of twenty implants were placed immediately in mandibular molar region without bone grafting, thew were divided equally into two groups. Surgical technique was similar for both groups. After immediate implant placement with primary stability of 35 N, both groups received custom made healing collar using flowable composite to seal the jumping distance.The study group (intervention) received a total of 60J/cm2 .10J/cm2 3 days before extraction, another 10J/cm2 at the fresh socket, another 10 J/cm2 after osteotomy, another 10J/cm2 after implant placement, another 20J/cm2 at the follow up visit with 3 days interval. After six weeks secondary implant stability was measured for both groups using Resonance Frequency Analysis device (RFA). Prosthetic phases started for implants that showed sufficient secondary stability. Results: All implants enrolled in this study showed sufficient secondary stability except for one totally avulsed implant from the control group. Study group showed more stability upon measuring using RFA device after six weeks of implant placement. The study group has shown a higher secondary stability compared to control group, the mean ISQ value of study (71.89±2.67) was significantly higher than control (62.43±8.62). Conclusion: Based on the results of our study we concluded that low level diode laser 980nm has a stimulatory effect on bone formation when applied before, during and after immediate implant placement, According to this study 60J/cm2 is recommended dose and it also gave better soft tissue healing results

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