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Ouch It is Crown Fracture

Hossam Hamza Mar 01, 2018 Dental Education

Crown fracture is one of the most common traumas in dentistry with higher incidence rate in upper anterior teeth (nearly 95%). It results in a psychogenic trauma and needs timely management to restore the appearance and function. Crown fractures could have severe forms that require complete removal of the subject tooth and replacement with implants or removal of fractured fragment with gingival reattachment, surgically exposing subgingival fracture, orthodontic extrusion and surgical extrusion. Composite fillings and post/core crowns are considered more conservative options that require minimal invasive.

Fiber posts are more routinely used nowadays than metal posts as they are passive, flexible and dentin colored. Currently, resin-modified glass ionomer cement, and dual curing resin cement are the most commonly resin cement used in practice. There are a number of factors that influence the success rate of fiber-post supported prosthesis, including the time of material used for bonding, the bonding technique and occlusion. Resin cement is used for attaching fiber posts to root dentine through surface irregularities to enhance elastic and adhesive characteristics; that is, tooth and post move as single unit with good stress distribution.

However, dental scientists evaluate the outcome of the outmost conservative technique, which is reattaching the fractured tooth fragment with new-generation bonding agents and adhesives. However, many concerns exist regarding the longevity and fracture strength of reattached teeth. Simple reattachment techniques involve minimal tooth preparation with buccal chamfer, superficial over-contouring and internal groove without fragment preparation. This procedure is known as biological preparation where circumferential beveling of enamel on the tooth and tooth fragment is done to increase the surface area of bonding and in turn increase the retention. Applying this technique is still dependent on the fracture location/extent, pulp involvement, time-lapse since the fracture happened, root and periodontal conditions and the type of bonding agent.

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Root fracture is one of the worst consequences of dental trauma that may occur even after restoring crown fracture. It can occur as a result of immature occlusal forces or heavy forces of mastication. So, the above-mentioned corrective techniques could be contraindicated when a patient has unfavorable bite relation such as deep bite or bruxism. Long-term follow-up is mandatory after restoring crown fractures to evaluate the integrity, color stability and longevity of reattached of the restoration.

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