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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (1): 93-99. doi: 10.19723/j.issn.1671-167X.2019.01.017

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Analysis of edge morphology of partial veneers made by different processing techniques and materials

Rui-jie WANG1,Min LIU1,Dan-yang SONG1,Sui YANG1,Qiao WANG2,Lei WANG1,△(),Hai-lan FENG1,△()   

  1. 1. Department of Prosthodontics, Beijing 100081, China
    2. Dental Laboratory, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2018-10-11 Online:2019-02-18 Published:2019-02-25
  • Contact: Lei WANG,Hai-lan FENG E-mail:wanglei_dentist@163.com;kqfenghl@bjmu.edu.cn
  • Supported by:
    Supported by the National Na-tural Science Foundation of China(81470770);and the New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology(PKUSSNCT-13B04)

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Abstract:

Objective: To compare the edge morphology of partial veneers made of different materials by slurry molding, heat-pressed and computer aided design/computer aided manufacturing (CAD/CAM) techniques. Methods: Thirty premolars with smooth surface and intact enamel were selected and randomly divided into five groups, 6 specimens for each group. Group A were made from feldspathic porcelain (Noritake ?) by slurry molding, while Group B were made from lithium disilicate glass ceramic (IPS E.max ? Press) by heat-pressed. Group C/D/E were respectively made from feldspar porcelain block (VITA Mark Ⅱ ?), zirconia-reinforced glass ceramic (VITA Suprinity ?) and hybrid ceramic with a ceramic-polymer network (VITA Enamic ?) by CAD/CAM techniques. All the partial veneers luted with light-cured composite resin. Then the partial veneers were trimmed and polished to achieve the smooth finishing margin, clinical polishing sets were used according to the product descriptions. Scanning electron microscope (SEM) was used to observe the edge morphology of prostheses and the exposure of resin cements. Results: The smooth surface and knife-like edge of the partial veneers could be obtained after bonding, trimming and polishing. The edges of Group A were slightly rough and the width of the exposed adhesive was (106.00±9.17) μm. In Group B, the edges were smoother than Group A, and the exposed wide adhesive strip was visible, which was (138.33±20.59) μm. In Group E, the edges were smooth too, and the width of exposed adhesive strip was (186.00±5.66) μm. The edges of Group C and Group D were rough and uneven, and the adhesive was rarely exposed, they were (50.67±7.51) μm and (65.67±17.90) μm. There were all significant differences between two groups, except Group C and Group D. Conclusion: After trimming and polishing in accordance with clinical procedures, the expected knife-like edge can be obtained in all groups. The width of the exposed resin adhesive of each group is different, the order: Mark Ⅱ/Suprinity

Key words: Partial veneer, Edge morphology, Slurry molding, Heat-pressed, Computer aided design

CLC Number: 

  • R783.3

Table 1

Characteristics and information of materials for partial veneer"

Group Material Manufacturer Color/size Class/terminology
A Feldspathic porcelain Noritake Dental Inc., Japan A2 High-temperature feldspathic porcelain powder
B IPS E.max Press Voclar Vivadent, Liechtenstein A2 Lithium disilicate ceramic
C MarkⅡ VITA Zahnfabrik, Germany A2/C14 Feldspathic porcelain
D Suprinity VITA Zahnfabrik, Germany A2/C14 Zirconia reinforced glass-ceramic
E Enamic VITA Zahnfabrik, Germany 2M2/C14 Polymer-infiltrated ceramics

Figure 1

Photograph of tooth after preparation"

Figure 2

Polishing tools A, Porcelain Adjustment Kit, CeraMaster; B, Vita Suprinity Polishing Set Clinical; C, GC06 Intraoral Twist Polisher Kit for Poly Ceramics."

Figure 3

Photographs of the partial veneers of Noritake (A),E.max (B), Mark Ⅱ (C) and Enamic (D)"

Figure 4

The micrographs of the energy spectrum analysis area of partial veneers (left) and the scanning spectrums (right) A, enamel; B, resin adhesive; C, veneer."

Figure 5

Scanning electron micrographs of the edge of partial veneers A, Noritake; B, E.max Press; C, Mark Ⅱ; D, Suprinity; E, Enamic. *RA, resin adhesive."

Table 2

Width of adhesive of partial veneers made by different processing technic and materials (n=3)"

Group Processing technic Material Width of adhesive/μm, x?±s
A Slurry molding Noritake 106.00±9.17a
B Heat-pressed E.max Press 138.33±20.59b
C CAD/CAM Mark Ⅱ 50.67±7.51c
D CAD/CAM Suprinity 65.67±17.90c
E CAD/CAM Enamic 186.00±5.66d

Figure 6

Edge of vertical section schematic diagram of the partial veneer A,the expected knife-like edge; B, abrasion of resin adhesive; C, fracture of resin adhesive; D, fracture of resin adhesive and veneer; E, abrasion of enamel; F, abrasion of veneer and resin adhesive."

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