J Korean Acad Conserv Dent.  2009 May;34(3):177-183. 10.5395/JKACD.2009.34.3.177.

Influence of three different preparation designs on the marginal and internal gaps of CEREC3 CAD/CAM inlays

• Seo DG
• Yi YA
• Lee Y
• Roh BD

• KMID: 2176142
• DOI: http://doi.org/10.5395/JKACD.2009.34.3.177

Abstract

The aim of this study was to evaluate the marginal and internal gaps in CEREC3 CAD/CAM inlays of three different preparation designs. CEREC3 Inlays of three different preparation designs (n = 10) were fabricated according to Group I-conventional functional cusp capping/shoulder preparation, Group II-horizontal reduction of cusps and Group III-complete reduction of cusps/shoulder preparation. After cementation of inlays, the bucco-lingual cross section was performed through the center of tooth. Cross section images of 20 magnifications were obtained through the stereomicroscope. The gaps were measured using the Leica application suite software at each reference point. Statistical analysis was performed using one-way ANOVA and Tukey's test (alpha<0.05). The marginal gaps ranged from 80.0 to 97.8 microm for Group I, 42.0 to 194.8 microm for Group II, 51.0 to 80.2 microm for Group III. The internal gaps ranged from 90.5 to 304.1 microm for Group I, 80.0 to 274.8 microm for Group II, 79.7 to 296.7 microm for Group III. The gaps of each group were the smallest on the margin and the largest on the horizontal wall. For the CEREC3 CAD/CAM inlays, the simplified designs (groups II and III) did not demonstrate superior results compared to the traditional cusp capping design (group I).

Keyword

CAD/CAM; preparation design; marginal gap; internal gap; CEREC3

MeSH Terms

Cementation
Inlays
Tooth

Figure

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  Figure 1 Different tooth preparations suggested for inlays: (A) Group I-conventional functional cusp capping/shoulder margin, (B) Group II-horizontal flat reduction of cups, (C) Group III-complete reduction of cusps/shoulder margin.

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  Figure 2 Schematic drawings of preparations in Groups I, II and III, representing bucco-lingual cross sections. Reference points in Groups II and III were designated based on reference points in Group I.

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  Figure 3 The stereomicroscope images from each group for measuring the gap distance (× 20).

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  Figure 4 Marginal and internal gaps at the reference points in the bucco-linugal section.

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