Preparation of retentive areas for clasps in enamel

Axinn, Sherman

doi:10.1016/0022-3913(75)90157-2

“…This procedure is important for obtaining appropriate prosthesis retention during gingival‐occlusal movement and effective reciprocity of the reciprocal clasp. When natural retention is absent, it can be obtained with crown restorations, as in the subjects for this study, 5,8 class V restorations in amalgam, 9 enamel recontouring, 10 or recontouring with resin 3,11–13 …”

mentioning

confidence: 99%

“…This procedure is important for obtaining appropriate prosthesis retention during gingival-occlusal movement and effective reciprocity of the reciprocal clasp. When natural retention is absent, it can be obtained with crown restorations, as in the subjects for this study, 5,8 class V restorations in amalgam, 9 enamel recontouring, 10 or recontouring with resin. 3,[11][12][13] Longitudinal studies for the evaluation of RPD planning and follow-up after prosthesis insertion are needed to assess the effectiveness of techniques for the preservation of remaining structures and the conservation of the preparations for prosthesis insertion.…”

mentioning

confidence: 99%

Longitudinal Clinical Evaluation of Undercut Areas and Rest Seats of Abutment Teeth in Removable Partial Denture Treatment

Aquino

¹

,

Barreto

²

,

Martins

³

et al. 2011

Journal of Prosthodontics

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“…This procedure is important for obtaining appropriate prosthesis retention during gingival-occlusal movement and effective reciprocity of the reciprocal clasp. When natural retention is absent, it can be obtained with crown restorations, as in the subjects for this study, 5,8 class V restorations in amalgam, 9 enamel recontouring, 10 or recontouring with resin. 3,[11][12][13] Longitudinal studies for the evaluation of RPD planning and follow-up after prosthesis insertion are needed to assess the effectiveness of techniques for the preservation of remaining structures and the conservation of the preparations for prosthesis insertion.…”

mentioning

confidence: 99%

Longitudinal clinical evaluation of undercut areas and rest seats of abutment teeth in removable partial denture treatment

2012

The Journal of Prosthetic Dentistry

0

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Purpose: Adequate preparation of abutment teeth for removable partial denture (RPD) rest seats allows appropriate masticatory force transmission, retention, and stability of supporting structures. It follows that careful preparation will be important for the longevity of the rehabilitation. The present study aimed to clinically evaluate rest seats and undercut areas of abutment teeth in RPD wearers after 2 years of use. Materials and Methods: A total of 193 occlusal, incisal, and cingulum rest seats were evaluated in terms of shape, rest adaptation, wear, caries, fractures, and surface type (enamel, composite resin, or amalgam). Two hundred and fourteen undercut areas were evaluated in terms of surface type (enamel or restoration) and integrity. This study was approved by the Research Ethics Committee of the Federal University of Rio Grande do Norte, resolution 196/1996, protocol number 11/05. Results: Intact preparations accounted for 92.2% of the total. Application of the Pearson test (p = 0.289) found no statistically significant differences among the materials on which the rest seats were prepared. For the undercut areas, 20.7% of those obtained on restorative material were nonintact. In addition, Fisher's exact test showed a statistically significant difference (p = 0.001) in surface type; enamel surfaces were shown to be 14 times more stable than restored surfaces. Conclusions:The results of this study suggest that rest seats are stable, regardless of the material on which they are prepared. Retentive areas were shown to be more stable when they were located in enamel.

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