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Effect of software version and parameter settings on the marginal and internal adaptation of crowns fabricated with the CAD/CAM system.

Shim JS, Lee JS, Lee JY, Choi YJ, Shin SW, Ryu JJ - J Appl Oral Sci (2015)

Bottom Line: The marginal and internal fit of the crowns were measured using the replica technique, which uses a low viscosity silicone material that simulates the thickness of the cement layer.The crowns designed with the version 4.2 of the software showed a better fit than those designed with the version 3.8, particularly in the axial wall and in the inner margin.On the other hand, the outer margin was not affected by the variables.Conclusion Compared to the version 3.8 of the software, the version 4.2 can be recommended for the fabrication of well-fitting crown restorations, and for the appropriate regulation of the spacer parameter.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Ansan Hospital, Korea University, Gyeonggi-do, Republic of Korea.

ABSTRACT
Objective This study investigated the marginal and internal adaptation of individual dental crowns fabricated using a CAD/CAM system (Sirona's BlueCam), also evaluating the effect of the software version used, and the specific parameter settings in the adaptation of crowns.Material and Methods Forty digital impressions of a master model previously prepared were acquired using an intraoral scanner and divided into four groups based on the software version and on the spacer settings used. The versions 3.8 and 4.2 of the software were used, and the spacer parameter was set at either 40 μm or 80 μm. The marginal and internal fit of the crowns were measured using the replica technique, which uses a low viscosity silicone material that simulates the thickness of the cement layer. The data were analyzed using a Friedman two-way analysis of variance (ANOVA) and paired t-tests with significance level set at p<0.05.Results The two-way ANOVA analysis showed the software version (p<0.05) and the spacer parameter (p<0.05) significantly affected the crown adaptation. The crowns designed with the version 4.2 of the software showed a better fit than those designed with the version 3.8, particularly in the axial wall and in the inner margin. The spacer parameter was more accurately represented in the version 4.2 of the software than in the version 3.8. In addition, the use of the version 4.2 of the software combined with the spacer parameter set at 80 μm showed the least variation. On the other hand, the outer margin was not affected by the variables.Conclusion Compared to the version 3.8 of the software, the version 4.2 can be recommended for the fabrication of well-fitting crown restorations, and for the appropriate regulation of the spacer parameter.

No MeSH data available.


Mean internal fit (mm) of each measuring points on mesiodistally sectioned surface. *indicates statistically significant differences
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f08: Mean internal fit (mm) of each measuring points on mesiodistally sectioned surface. *indicates statistically significant differences

Mentions: The accuracy of the fit at each measuring point for each experimental group is summarized in Figures 2 to 6. Statistical significances between groups were demonstrated in Figures 7 and 8. The results drawn from the average values of the same categorized measuring points are shown in Figure 9. The two-way ANOVA analysis showed the software version and the spacer parameter significantly affected the fit of crowns (p<.05) (Table 1).


Effect of software version and parameter settings on the marginal and internal adaptation of crowns fabricated with the CAD/CAM system.

Shim JS, Lee JS, Lee JY, Choi YJ, Shin SW, Ryu JJ - J Appl Oral Sci (2015)

Mean internal fit (mm) of each measuring points on mesiodistally sectioned surface. *indicates statistically significant differences
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4621944&req=5

f08: Mean internal fit (mm) of each measuring points on mesiodistally sectioned surface. *indicates statistically significant differences
Mentions: The accuracy of the fit at each measuring point for each experimental group is summarized in Figures 2 to 6. Statistical significances between groups were demonstrated in Figures 7 and 8. The results drawn from the average values of the same categorized measuring points are shown in Figure 9. The two-way ANOVA analysis showed the software version and the spacer parameter significantly affected the fit of crowns (p<.05) (Table 1).

Bottom Line: The marginal and internal fit of the crowns were measured using the replica technique, which uses a low viscosity silicone material that simulates the thickness of the cement layer.The crowns designed with the version 4.2 of the software showed a better fit than those designed with the version 3.8, particularly in the axial wall and in the inner margin.On the other hand, the outer margin was not affected by the variables.Conclusion Compared to the version 3.8 of the software, the version 4.2 can be recommended for the fabrication of well-fitting crown restorations, and for the appropriate regulation of the spacer parameter.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Ansan Hospital, Korea University, Gyeonggi-do, Republic of Korea.

ABSTRACT
Objective This study investigated the marginal and internal adaptation of individual dental crowns fabricated using a CAD/CAM system (Sirona's BlueCam), also evaluating the effect of the software version used, and the specific parameter settings in the adaptation of crowns.Material and Methods Forty digital impressions of a master model previously prepared were acquired using an intraoral scanner and divided into four groups based on the software version and on the spacer settings used. The versions 3.8 and 4.2 of the software were used, and the spacer parameter was set at either 40 μm or 80 μm. The marginal and internal fit of the crowns were measured using the replica technique, which uses a low viscosity silicone material that simulates the thickness of the cement layer. The data were analyzed using a Friedman two-way analysis of variance (ANOVA) and paired t-tests with significance level set at p<0.05.Results The two-way ANOVA analysis showed the software version (p<0.05) and the spacer parameter (p<0.05) significantly affected the crown adaptation. The crowns designed with the version 4.2 of the software showed a better fit than those designed with the version 3.8, particularly in the axial wall and in the inner margin. The spacer parameter was more accurately represented in the version 4.2 of the software than in the version 3.8. In addition, the use of the version 4.2 of the software combined with the spacer parameter set at 80 μm showed the least variation. On the other hand, the outer margin was not affected by the variables.Conclusion Compared to the version 3.8 of the software, the version 4.2 can be recommended for the fabrication of well-fitting crown restorations, and for the appropriate regulation of the spacer parameter.

No MeSH data available.