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Effect of span length on the fit of zirconia framework fabricated using CAD/CAM system.

Lee JY, Choi SJ, Kim MS, Kim HY, Kim YS, Shin SW - J Adv Prosthodont (2013)

Bottom Line: The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (α=.05).There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section).Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

View Article: PubMed Central - PubMed

Affiliation: Postgraduate School of Clinical Dentistry, Institute for Clinical Dental Research, Korea University, Seoul, Republic of Korea.

ABSTRACT

Purpose: The purpose of this study was to evaluate the effect of the span length on the fit of zirconia framework fabricated using CAD/CAM system.

Materials and methods: Abutments for single, 4-unit and 6-unit fixed partial prostheses were fabricated. Ten zirconia frameworks were fabricated for each group. The marginal and internal gap were presented by means of replica technique and measured by measuring microscope (AXIO®, Carl Zeiss, Rochester, NY) and software (I-solution®, IMT i-solution Inc., Vancouver, BC, Canada). The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (α=.05).

Results: There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section). In some marginal reference points of 6-unit group (P<.05), the marginal gap were larger than 120 µm.

Conclusion: Span length of zirconia core may have an influence on marginal and internal fit. Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

No MeSH data available.


Directions and positions of section of replica materials (Left: directions of labio-lingual and mesiodistal section, Right: view of labio-lingual section).
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Figure 5: Directions and positions of section of replica materials (Left: directions of labio-lingual and mesiodistal section, Right: view of labio-lingual section).

Mentions: After 5 minutes, the core was removed from the model carefully. When doing so, the silicon film of Fit checker has to be fully attached to silicone core. Filling inner surface of silicone film of core with regular bodied addition silicone impression material (AquasilLV, Densply Caulk, USA) and hardening the filled material increase strength andalso enables gaining of stable film layer. Each 8 measuring points were established for labial and mesio-distal side respectively (Fig. 4), and cutting was done right in the center of the model labialy and mesio-distally (Fig. 5). By using measuring microscope (AXIO®, Carl Zeiss, Rochester, NY, USA) and I-Solution™ (IMT I-Solution Inc., Vancouver, BC, Canada), thickness of fit checker was measured at 16 measuring points of each abutment teeth (Fig. 6). Mean value was documented after 3 times measured by 2 experimenter for each measuring points.


Effect of span length on the fit of zirconia framework fabricated using CAD/CAM system.

Lee JY, Choi SJ, Kim MS, Kim HY, Kim YS, Shin SW - J Adv Prosthodont (2013)

Directions and positions of section of replica materials (Left: directions of labio-lingual and mesiodistal section, Right: view of labio-lingual section).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3675283&req=5

Figure 5: Directions and positions of section of replica materials (Left: directions of labio-lingual and mesiodistal section, Right: view of labio-lingual section).
Mentions: After 5 minutes, the core was removed from the model carefully. When doing so, the silicon film of Fit checker has to be fully attached to silicone core. Filling inner surface of silicone film of core with regular bodied addition silicone impression material (AquasilLV, Densply Caulk, USA) and hardening the filled material increase strength andalso enables gaining of stable film layer. Each 8 measuring points were established for labial and mesio-distal side respectively (Fig. 4), and cutting was done right in the center of the model labialy and mesio-distally (Fig. 5). By using measuring microscope (AXIO®, Carl Zeiss, Rochester, NY, USA) and I-Solution™ (IMT I-Solution Inc., Vancouver, BC, Canada), thickness of fit checker was measured at 16 measuring points of each abutment teeth (Fig. 6). Mean value was documented after 3 times measured by 2 experimenter for each measuring points.

Bottom Line: The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (α=.05).There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section).Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

View Article: PubMed Central - PubMed

Affiliation: Postgraduate School of Clinical Dentistry, Institute for Clinical Dental Research, Korea University, Seoul, Republic of Korea.

ABSTRACT

Purpose: The purpose of this study was to evaluate the effect of the span length on the fit of zirconia framework fabricated using CAD/CAM system.

Materials and methods: Abutments for single, 4-unit and 6-unit fixed partial prostheses were fabricated. Ten zirconia frameworks were fabricated for each group. The marginal and internal gap were presented by means of replica technique and measured by measuring microscope (AXIO®, Carl Zeiss, Rochester, NY) and software (I-solution®, IMT i-solution Inc., Vancouver, BC, Canada). The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (α=.05).

Results: There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section). In some marginal reference points of 6-unit group (P<.05), the marginal gap were larger than 120 µm.

Conclusion: Span length of zirconia core may have an influence on marginal and internal fit. Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

No MeSH data available.