Performance of Curing Times and Intensitis

Study Overview
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Brief Summary
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The aim of the study is to compare the effect of high intensity light cure (2200 mw/cm2) for 1 second with low intensity light cure (1200 mw/cm2) for 20 seconds on the clinical performance of bulk fill resin composite restorations in compound Class II cavities of posterior teeth

Detailed Description
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The prepared cavities will be conditioned with 35% phosphoric acid gel for15 seconds, then will be rinsed and dried with compressed air. Then application of universal adhesive system to all cavity with bond brush then light cured for 10 seconds using LED light curing unit (1200 mw/cm2). Extra-Fill bulk fill resin composite will be applied in onebulk increment and will be light polymerized for 1 second using (LED) light curing unit (2200 mw/cm2).for intervention group Extra-Fill bulk fill resin composite will be applied in one bulk increment and will be light polymerized for 20 seconds using (LED) light curing unit (1200 mw/cm2) fot control group

Official Title
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Effect of Different Curing Times and Intensities on The Performance of Compound Class II Bulk-Fill Resin Composite Restorations: (An In-Vivo and In-Vitro Study)

Conditions
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Clinical Performance

Intervention / Treatment
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* Device: High intensity light cure


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Permanent premolars or molars. Moderate to deep compound class II cavities. Vital with the positive reaction to a cold thermal stimulus. Absence of parafunctional habits Exclusion Criteria: Teeth with clinical symptoms of pulpitis such as spontaneous pain or sensitivity to pressure. Non-vital teeth. Secondary carious lesions. Advanced periodontal disease

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: High intensity light cure<br>High intensity light curing (2200 mw/cm2)To achieve increased power and a wider spectrum for short exposure time (1 second) to overcome resin composite restoration techniques sensitivity and shorten the clinical procedure | Device: High intensity light cure<br>* Bulk fill resin composite restoration cured with high intensity light curing (2200 mw/cm2)To achieve increased power and a wider spectrum for short exposure time (1 second) to overcome resin composite restoration techniques sensitivity and shorten the clinical procedure<br>|
| Active Comparator: Low intensity light cure<br>Conventional light curing (1200 mw/cm2) for long exposure time (20 seconds) to achieve the slower rate of conversion allowing for a better flow of the material, which decreases contraction stress in the filling material | Device: High intensity light cure<br>* Bulk fill resin composite restoration cured with high intensity light curing (2200 mw/cm2)To achieve increased power and a wider spectrum for short exposure time (1 second) to overcome resin composite restoration techniques sensitivity and shorten the clinical procedure<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Clinical performance | Clinical performance of bulk fill resin composite restorations will be evaluated by modified USPHS Criteria includes: Marginal Discoloration Marginal adaptation Secondary caries Postoperative sensitivity For each criteria one score will be chosen from 3 scores (Alpha,Bravo&Charlie). | Change from the baseline at 6 months and12 months |