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  • Title: The effect of resin composite pins on the retention of class IV restorations.
    Author: Muhlbauer JA, Dunn WJ, Roberts HW, Murchison DF.
    Journal: Oper Dent; 2002; 27(3):284-8. PubMed ID: 12022461.
    Abstract:
    Standardized Class IV cavity preparations were made in 48 human incisors. They were then divided into three groups of 16 teeth each. Group 1 was prepared with no internal retentive features. Groups 2 and 3 included an internal pin channel prepared with a #330 and a #329 bur, respectively. All specimens were restored with a micro-hybrid resin-based composite restorative material and a fifth generation dentin bonding system. Specimens were loaded to failure in an Instron Universal Testing Machine perpendicular to the long axis of the teeth. There was no evidence to suggest a difference in force required to dislodge the restoration among the three groups tested (p=0.185). Resin composite pins do not increase the retention of Class IV resin composite restorations.
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