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Cusp reinforcement by the acid-etch technique.

D Morin, R DeLong, W H Douglas

    Journal of Dental Research
    |August 1, 1984
    PubMed
    Summary
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    Bonded dental restorations significantly reinforce maxillary pre-molars against occlusal stress compared to non-bonded options. The acid-etch technique demonstrated superior cuspal stability and reduced deformation under load.

    Area of Science:

    • Restorative Dentistry
    • Biomaterials Science
    • Dental Mechanics

    Background:

    • Maxillary pre-molars with MOD (mesio-occluso-distal) preparations are susceptible to cuspal flexure under occlusal forces.
    • Assessing the mechanical reinforcement provided by various restorative materials and techniques is crucial for long-term restoration success.

    Purpose of the Study:

    • To compare the cuspal reinforcement and deformation of MOD preparations restored with different bonded and non-bonded techniques.
    • To evaluate the effectiveness of the acid-etch bonding technique in enhancing cuspal stability.

    Main Methods:

    • Strain gauges were applied to 12 maxillary pre-molars undergoing MOD preparations.
    • Occlusal stress was induced using servohydraulics to measure cuspal flexure.
    • Two bonded and three non-bonded restorative procedures were tested and compared.

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    Main Results:

    • Bonded restorative procedures provided significantly greater cuspal reinforcement than non-bonded procedures and unprepared teeth.
    • While one non-bonded composite showed some reinforcement, it was substantially less than bonded techniques.
    • Restorations bonded with the acid-etch technique exhibited significantly less hysteresis (deformation) under occlusal load.

    Conclusions:

    • Bonded restorations, particularly those using the acid-etch technique, offer superior cuspal reinforcement and stability for MOD preparations.
    • The findings highlight the mechanical advantages of adhesive restorative dentistry in preserving tooth structure integrity.