The journal of contemporary dental practice · 2025
Impact of Marginal Elevation in Restored Endodontically Treated Teeth with CAD/CAM Ceramic Endocrowns on the Marginal Adaptation (In Vitro).
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Ahmed Omaima Sayed, Amgad Shams Waaz, Bakery Ahmed Mohamed
Аннотация
AIM: To assess the effect of marginal elevation in endodontically treated teeth repaired with CAD/CAM ceramic endocrowns on marginal adaptation.
MATERIALS AND METHODS: 20 sound mandibular first molars were treated endodontically and prepared for endocrowns with a butt-joint occlusal edge and mesial proximal box. They were divided into two groups (n = 10 each) based on ceramic type: Group H (hybrid ceramic) and group L [lithium disilicate ceramics (LDS) ceramic]. Each group was further divided into subgroups E (with marginal elevation) and N (without marginal elevation), with 5 specimens each. The endocrowns were cemented using dual-cured self-adhesive resin cement and exposed to 5000 thermal aging cycles (5-55°C). Marginal adaptation was evaluated using a stereo microscope at five mesial margin locations, and the mean gap measurement was calculated.
RESULTS: The lowest marginal gap measurements were recorded by hybrid ceramic (Grandio) with deep marginal elevation (23.25 µm), which is significantly lower than all tested subgroups (p < 0.001). The highest marginal gap measurement was recorded by LDS (IPS e.max) CAD without deep marginal elevation (57.62 µm), which is significantly higher than all tested sub-groups.
CONCLUSION: Compared to LDS IPS e.max, hybrid ceramics with and without marginal elevation exhibit superior marginal adaptation.
CLINICAL SIGNIFICANCE: Marginal adaptation of endocrowns is critical for proper seal, preventing micro leakage and secondary caries, thus enhancing restoration longevity and patient outcomes for severely damaged teeth. How to cite this article: Ahmed OS, Amgad SW, Bakery AM. Impact of Marginal Elevation in Restored Endodontically Treated Teeth with CAD/CAM Ceramic Endocrowns on the Marginal Adaptation (In Vitro). J Contemp Dent Pract 2025;26(5):473-480.
MATERIALS AND METHODS: 20 sound mandibular first molars were treated endodontically and prepared for endocrowns with a butt-joint occlusal edge and mesial proximal box. They were divided into two groups (n = 10 each) based on ceramic type: Group H (hybrid ceramic) and group L [lithium disilicate ceramics (LDS) ceramic]. Each group was further divided into subgroups E (with marginal elevation) and N (without marginal elevation), with 5 specimens each. The endocrowns were cemented using dual-cured self-adhesive resin cement and exposed to 5000 thermal aging cycles (5-55°C). Marginal adaptation was evaluated using a stereo microscope at five mesial margin locations, and the mean gap measurement was calculated.
RESULTS: The lowest marginal gap measurements were recorded by hybrid ceramic (Grandio) with deep marginal elevation (23.25 µm), which is significantly lower than all tested subgroups (p < 0.001). The highest marginal gap measurement was recorded by LDS (IPS e.max) CAD without deep marginal elevation (57.62 µm), which is significantly higher than all tested sub-groups.
CONCLUSION: Compared to LDS IPS e.max, hybrid ceramics with and without marginal elevation exhibit superior marginal adaptation.
CLINICAL SIGNIFICANCE: Marginal adaptation of endocrowns is critical for proper seal, preventing micro leakage and secondary caries, thus enhancing restoration longevity and patient outcomes for severely damaged teeth. How to cite this article: Ahmed OS, Amgad SW, Bakery AM. Impact of Marginal Elevation in Restored Endodontically Treated Teeth with CAD/CAM Ceramic Endocrowns on the Marginal Adaptation (In Vitro). J Contemp Dent Pract 2025;26(5):473-480.