Two imaging techniques for 3D quantification of pre-cementation space for CAD/CAM crowns

Rungruanganunt, Patchanee; Kelly, J. Robert; Adams, Douglas

doi:10.1016/j.jdent.2010.08.015

Cited by 46 publications

(39 citation statements)

References 7 publications

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“…All the studies mentioned in the review (14) have compared the replica technique with the crosssection technique. Only one study (22) comparing the silicone replica technique to micro-CT was found, but the methodology used to measure the pre-cementation space is different from the present study. Both techniques (micro-CT imaging and optical density image analysis) used imaging of polyvinylsiloxane (PVS) impressions.…”

Section: Introductioncontrasting

confidence: 59%

“…The quantitative optical analysis method used the same standardized thickness specimens and measured the cement space thickness by transilluminating the pre-cementation space impressions. Also, the results from the present study cannot be directly compared to a previous study (22), because there are significant methodological differences and the values for marginal and internal adaptation are not reported and analyzed in the same way. The distribution of thicknesses in the pre-cementation space replica measured by micro-CT was reported by volume percentage and more than 90% of the measurements ranged from less than 50 µm to 170 µm.…”

Section: Discussionmentioning

confidence: 82%

“…Thus, it is important to recognize the limitations of the currently used techniques, as well as the kind of data that may obtained with each method (16). Few studies compared different methods used to evaluate marginal and internal fit of ceramic restorations (14), and only one study used silicone replica technique and micro-CT (22). However, it is important to note that the methodology presented in this previous study (22) is different from the one used in the present study.…”

Section: Discussionmentioning

confidence: 89%

“…Few studies compared different methods used to evaluate marginal and internal fit of ceramic restorations (14), and only one study used silicone replica technique and micro-CT (22). However, it is important to note that the methodology presented in this previous study (22) is different from the one used in the present study. Rungruanganunt et al (22) evaluated the pre-cementation space of single zirconia copings using two methods: micro-CT and quantitative optical analysis.…”

Section: Discussionmentioning

confidence: 90%

“…The authors determined the silicone thickness using a photometric technique. Based on the Beer-Lambert Law, proportionality between a known thickness (standardized thickness specimens fabricated from the same impression material) and the amount of light transmitted through the impression material could be assumed (22).…”

Section: Introductionmentioning

confidence: 99%

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Marginal and Internal Adaptation of Zirconia Crowns: A Comparative Study of Assessment Methods

et al. 2017

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Marginal and internal adaptation is critical for the success of indirect restorations. New imaging systems make it possible to evaluate these parameters with precision and nondestructively. This study evaluated the marginal and internal adaptation of zirconia copings fabricated with two different systems using both silicone replica and microcomputed tomography (micro-CT) assessment methods. A metal master model, representing a preparation for an all-ceramic full crown, was digitally scanned and polycrystalline zirconia copings were fabricated with either Ceramill Zi (Amann-Girrbach) or inCoris Zi (Dentslpy-Sirona), n=10. For each coping, marginal and internal gaps were evaluated by silicone replica and micro-CT assessment methods. Four assessment points of each replica cross-section and micro-CT image were evaluated using imaging software: marginal gap (MG), axial wall (AW), axio-occlusal angle (AO) and mid-occlusal wall (MO). Data were statistically analyzed by factorial ANOVA and Tukey test (α=0.05). There was no statistically significant difference between the methods for MG and AW. For AO, there were significant differences between methods for Amann copings, while for Dentsply-Sirona copings similar values were observed. For MO, both methods presented statistically significant differences. A positive correlation was observed determined by the two assessment methods for MG values. In conclusion, the assessment method influenced the evaluation of marginal and internal adaptation of zirconia copings. Micro-CT showed lower marginal and internal gap values when compared to the silicone replica technique, although the difference was not always statistically significant. Marginal gap and axial wall assessment points showed the lower gap values, regardless of ceramic system and assessment method used.

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Section: Introductioncontrasting

confidence: 59%

Section: Discussionmentioning

confidence: 82%