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The first light-activated systems were formulated for UV light to initiate free radicals. Today the UV light-cured composites have been replaced by visible blue-light-activated systems with greatly improved depth of cure, a controllable working time, and other advantages.

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Resin cements have the lowest solubility in the oral cavity due to their hydrophobic nature and polymerization process, which makes them highly resistant to water sorption and dissolution.

25143

A periodontal probe measures the amount of attachment loss.

58687

Midline diastema is a common condition involving a gap between the two upper front teeth.

Various orthodontic techniques and appliances can be used to close this space, which typically involves applying controlled force to move the teeth closer together.

(a) Lingual bow with inter tooth traction: A lingual bow is an orthodontic appliance that can be used with traction (force) between teeth to close a diastema.

(b) Hawley's appliance with finger springs: A Hawley appliance is a type of removable retainer often used in orthodontics.

It can be modified with finger springs to apply gentle pressure and move teeth, including closing a diastema.

(c) Bonding tooth and inter tooth elastics: Bonding brackets or buttons to the teeth and using intermaxillary elastics (rubber bands) is a standard method to apply force and close gaps.

(d) Use of steel ligature directly on tooth: Applying a steel ligature wire directly around a tooth to move it would likely cause uncontrolled tilting of the tooth and potential damage to the tooth and surrounding tissues, rather than a proper, controlled correction of the diastema.It is not a standard or safe method for this purpose.

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Blood clot protection is not a primary indication for suturing following extraction. The blood clot forms naturally and is protected by proper post-extraction care. Suturing is mainly indicated for flap reapproximation, tissue immobilization, and hemostasis.

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The primary mandibular central incisors usually erupt at 6-8 months

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According to Melcher's concept, the regeneration of new attachment is from the periodontal ligament.

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TPI test: The Treponema pallidum immobilization (TPI) test involves using live T. pallidum as an antigen to detect antibodies in the patient's blood serum.