In vitro analysis of residual tooth structure of maxillary anterior teeth after different prosthetic finish line preparations for full-coverage single crowns

Abstract

To evaluate residual dentin thickness (RDT) after different tooth preparations, 90 sound maxillary anterior teeth were selected and divided into 3 groups according to tooth type (n = 30), namely, maxillary central incisors, maxillary lateral incisors, and maxillary canines. In each group, specimens were randomly divided and prepared for single-crown coverage with shoulder (SHO, n = 10, control), slight chamfer (CHA, n = 10), and knife-edge (KNE, n = 10) finish lines. After tooth preparation, specimens were sectioned and divided into 4 subgroups (buccal, distal, palatal, and mesial) according to measurement area. RDT values were compared by using one-way ANOVA and Tukey's post hoc test (P = 0.05). Significant differences were found between SHO and the other two groups (P < 0.05) but not between CHA and KNE (P > 0.05). SHO was significantly more aggressive than CHA and KNE, which were comparable. Interproximal areas became critical due to thin RDT, which could potentially compromise the structural and biological integrity of teeth. The choice of finish line should be guided by careful clinical evaluation. (J Oral Sci 55, 79-84, 2013)

Restorative difficulty evaluation system of endodontically treated teeth

“…Several mentioned factors are intercorrelated such as those related to the tooth (from 1 to 5) and of the mouth and patient (from 6 to 8) as well. The factors included in RDES are those that are mainly recognized in the literature as the most important to be clinically evaluated 1–58 …”

“…Interdisciplinary considerations should be made to assess how much sound remaining tooth structure versus restorative material will be available at the end of the treatment before final impressions. 43 An endodontically treated tooth might present an intact periodontium, or a loss of attachment but without the need for periodontal therapy.…”

“…Local periodontal conditions are another important factor to be evaluated. Interdisciplinary considerations should be made to assess how much sound remaining tooth structure versus restorative material will be available at the end of the treatment before final impressions 43 …”

Incidence of Accidental Pulp Exposure During Tooth Preparation by Undergraduate Students for Fixed Partial Dentures

“…Metal-ceramic restoration requires a standard average reduction of 1.5-2 mm of incisal/occlusal reduction, axial reduction of 1.2-1.5 mm, and proximal reduction of 1.5 mm depends on the type of restoration. 10,11 The total thickness of the dental tissues differs according to the location and size of the tooth. Therefore, clinical examination and radiographic…”