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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (5): 977-982. doi: 10.19723/j.issn.1671-167X.2021.05.028

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Morphology accuracy evaluation of direct composite occlusal veneer using two types of modified stamp-technique

YANG Yang1,PU Ting-ting2,CHEN Li1,TAN Jian-guo1,△()   

  1. 1. Department of Prosthodontics, Beijing 100081, China
    2. Dental Laboratory, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, China
  • Received:2019-10-08 Online:2021-10-18 Published:2021-10-11
  • Contact: Jian-guo TAN E-mail:kqtanjg@bjmu.edu.cn

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Abstract:

Objective: To evaluate the morphology accuracy of direct occlusal veneer using two types of modified stamp-technique, comparing the results of two types of stamp and different composite resin. Methods: Model scanner was used to get the original data from the standard resin teeth in plastic model. Two types of stamps were made: solid silicon stamp and transparent silicon stamp. In the study, 54 resin tooth were randomly divided into 9 groups: Groups 1-8 were restored by direct composite resin, using general and bulk-filled composite resin in occlusal veneer (1 mm or 2 mm) with two types of stamp-technique (the solid silicon, and the transparent silicon), and the control group was restored by indirect way using CAD/CAM composite resin restoration by biocopy technique to mimic the original shape of the teeth. After the resin teeth were prepared for occlusal veneer, the direct and indirect composite resins were restored. After the restoration was finished, the data were obtained again by the same model scanner in the plastic model. 3D comparisons were made using the original and restoration data, the average difference and the root mean square of difference (RMS) were recoded from the software. The RMS of all the groups were analyzed using one way ANOVA (α=0.05). Results: The RMS of occlusal surface in solid silicon stamp group was (0.136±0.031) mm, in transparent silicon group was (0.130±0.024) mm, and in control group was (0.130±0.009) mm. There were no significant difference. While the RMS of buccal/lingual surface in solid silicon stamp group was the smallest [(0.135±0.020) mm, P<0.05], and in transparent silicon group it was (0.147±0.021) mm, and control group (0.153±0.014) mm. The general composite resin using the two types of stamp had the largest occlusal RMS in 2 mm occlusal veneer, which were significantly larger than control group (P<0.05). Conclusion: The direct occlusal veneer using two types of modified “stamp-technique” had relatively good morphology accuracy. Direct occlusal veneer using bulk-filled composite resin made with two types of stamp technique had even more accurate morphology than using general composite resin. The solid silicon stamp had a better morphology accuracy in buccal/lingual surface than the transparent silicon stamp.

Key words: Stamp technique, Composite resin, Occlusal veneer, Morphology accuracy

CLC Number: 

  • R783

Figure 1

Make two types of silicon stamps A, the solid silicon stamp; B, the translucent silicon stamp; C, the inside surface of both types of stamps."

Table 1

Materials in each group"

Group Materials of stamp Occlusal thickness/mm Composite resin
T1H Solid silicon-topasA85 1 General composite-Herculite
T1S Solid silicon-topasA85 1 Bulk-filled composite-Sonicfill2
T2H Solid silicon-topasA85 2 General composite-Herculite
T2S Solid silicon-topasA85 2 Bulk-filled composite-Sonicfill2
K1H Translucent silicon-kristall A70 1 General composite-Herculite
K1S Translucent silicon-kristall A70 1 Bulk-filled composite-Sonicfill2
K2H Translucent silicon-kristall A70 2 General composite-Herculite
K2S Translucent silicon-kristall A70 2 Bulk-filled composite-Sonicfill2
CC - 2 CAD/CAM composite-Runci

Figure 2

Restorative sequence of two types of stamp technique A to E, the solid silicon stamp technique; F to J, translucent silicon stamp technique. A, tooth separation of matrix strip; B, placement of composite resin; C, placement of PTFE tape and stamp; D, removing stamp and modify the restoration; E, polymerization and final finishing; F, tooth separation of matrix strip; G, placement of composite resin and stamp; H, removing stamp and modify the restoration; I, placement of stamp and preliminary polymerization; J, final polymerization and finishing."

Figure 3

3D compare of original shape and restorative shape"

Table 2

RMS of occlusal and buccal/lingual surface in each group ( x ?±s)"

Group Occlusal RMS/mm Buccal and lingual RMS/mm
Groups of solid silicon stamp 0.136±0.031 0.135±0.020*
Groups of translucent silicon stamp 0.130±0.024 0.147±0.021
Control group 0.130±0.009 0.155±0.014

Figure 4

RMS after 3D compare of occlusal surface(A) and buccal/lingual surface(B) of each group Identical letter shows no significant difference on each values, P>0.05. RMS, root mean square."

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