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Journal of Peking University (Health Sciences) ›› 2023, Vol. 55 ›› Issue (6): 1105-1110. doi: 10.19723/j.issn.1671-167X.2023.06.023

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Influence of cavity design on quality of margin and marginal adaptation and microleakage of all-ceramic CAD/CAM inlays

Si-ming ZHAO,Xiao-yan WANG*()   

  1. Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering and Technology for Computerized Dentistry & NMPA Key Laboratory for Dental Materials, Beijing 100081, China
  • Received:2023-01-04 Online:2023-12-18 Published:2023-12-11
  • Contact: Xiao-yan WANG E-mail:wangxiaoyan@pkuss.bjmu.edu.cn
  • Supported by:
    Clinical Research Fund of Young Scientists for Ceramic Materials of Chinese Stomatological Association(CSA-P2019-04)

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Abstract:

Objective: To investigate the influence of 135° and 90° cavity design on quality of margin and marginal adaptation and microleakage of all-ceramic computer aided design/computer aided manufacturing (CAD/CAM) inlays. Methods: One hundred extracted human molars were prepared by criteria of buccal occlusal (BO) inlay. On the buccal, the mesial margin was prepared as 135° bevel while the distal margin was prepared as butt-joint. All-ceramic restorations were made in the Sirona CEREC AC CAD/CAM system with VitaBlocs Mark Ⅱ, Upcera UP.CAD, IPS e.max CAD, Upcera Hyramic and Lava Ultimate. The gaps between each inlay's mesial margin-abutment and distal margin-abutment were recorded under an optical microscope. Each inlay was adhered to the abutment and aged by thermal cycling for 10 000 times. Each specimen was cut into 3 slices after staining. Dye penetration was evaluated under an optical microscope for mesial and distal margins. Results: Mean marginal integrity rate, mean marginal gap value and mean depth of microleakage of 135° margin of Group Upcera Hyramic and Lava Ultimate were significantly better than those of Group VitaBlocs Mark Ⅱ, Upcera UP.CAD and IPS e.max CAD(P < 0.05). Mean marginal gap value, mean depth of microleakage and scale of mean depth of microleakage of 90° margin of Group Upcera Hyramic and Lava Ultimate were significantly better than those of Group Upcera UP.CAD and IPS e.max CAD (P < 0.05) while mean marginal integrity rate was not significantly different (P>0.05). Mean marginal integrity rate of 90° margin was significantly better than that of 135° margin in each group (P < 0.05) while mean depth of microleakage between different margins was not significantly different in each group (P>0.05). Mean marginal gap value of 90° margin of Group VitaBlocs Mark Ⅱ and IPS e.max CAD was significantly better than that of 135° margin (P < 0.05) while there was not significant difference in other 3 groups between 90° and 135° margin (P>0.05). Scale of mean depth of microleakage of 135° margin of Group Upcera Hyramic and Lava Ultimate was significant better than that of 90° margin (P < 0.05) while there was not significantly different in other 3 groups between 90° and 135° margin (P>0.05). Conclusion: The mesial and distal margins of abutement of all-ceramic inlay should be prepared as butt-joint.

Key words: CAD/CAM, Cavity design, Marginal integrity, Marginal Gap, Microleakage

CLC Number: 

  • R783.1

Figure 1

Experimental flow graph"

Figure 2

Preparation criteria of inlay A, buccal view; B, occlusal view."

Figure 3

Inlay fitting to the abutment A, 135° margin; B, 90° margin."

Figure 4

Dye penetration of adhesive interface between inlay and abutment A, 135° margin; B, 90° margin."

Figure 5

Rate of marginal integrity of inlays a, VitaBlocs Mark Ⅱ; b, Upcera UP.CAD; c, IPS e.max CAD; d, Upcera Hyramic; e, Lava Ultimate. * P < 0.05, a significant difference between 135° margin and 90° margin in each group by using paired-samples t test."

Figure 6

Mean marginal gap value of inlays a, VitaBlocs Mark Ⅱ; b, Upcera UP.CAD; c, IPS e.max CAD; d, Upcera Hyramic; e, Lava Ultimate.* P < 0.05, a significant difference between 135° margin and 90° margin in each group by using paired-samples t test."

Figure 7

Mean depth of dye penetration a, VitaBlocs Mark Ⅱ; b, Upcera UP.CAD; c, IPS e.max CAD; d, Upcera Hyramic; e, Lava Ultimate."

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