posterpresentation
Description

Title: 0913 - Accuracy of CAD/CAM Bite Splints

Authors:

Marcel Reymus (Presenter)
Department of Conservative Dentistry and Periodontology of the University of Munich

Andreas Keßler, Department of Conservative Dentistry and Periodontology of the University of Munich
Reinhard Hickel, Department of Conservative Dentistry and Periodontology of the University of Munich

Abstract:

Objectives: This study aims to investigate the accuracy of the intaglio surface of bite splints in dependence of the manufacturing process (3D printing vs milling), the positioning on the printer’s platform (horizontal vs vertical) and of different resins.

Methods: A bite splint was computer-aided-designed (Exocad) and exported as an STL-file (master file). The splint was then manufactured ten times each using three different 3D printers and their corresponding resins with the splint positioned either horizontally or vertically to the printer’s platform: i. Form 2 & Dental LT (Formlabs), ii. D20 II (Rapidshape) & OrthoClear (NextDent), iii. SolFlex 350 & experimental resin (VOCO). Ten splints were milled out of prefabricated blocks: M5 & Temp Premium (Zirkonzahn). The intaglio surfaces of the splints were scanned (Activity 885 Mark2, Smartoptics) and exported as STL-files. These files were compared to the master file (trueness) and to each other within the groups (precision). To this end the STL-files were converted into clouds of 100,000 points and the absolute distances between two files was calculated. Data was evaluated by SPSS 24.0.

Results: Descriptive statistic is presented in Table 1. No normal distribution was found by Shapiro-Wilk test. Mann-Whitney-U test revealed statistical differences between groups (p<0.05). Regarding trueness milled splints showed the shortest absolute distances followed by horizontally printed splints. Regarding precision vertically printed splints showed the shortest distances.

Conclusions: Milled splints showed the best results in terms of trueness. There exists a difference in the values for trueness and precision between horizontally and vertically printed splints.

Table(s):

print method trueness   precision  
  mean (SD) 95% CI mean (SD) 95% CI
form_hor 104.4 (37.1)c [99,2;101.6] 69.8 (23.3)d [68.8;70.8]
form_ver 137.0 (60.0)e [135.0;138.8] 67.1 (23.5)c [66.0;68.1]
next_hor 93.7 (31.7)b [92.8;94.7] 66.0 (23.8)c [65.0;67.0]
next_ver 100.9 (36.6)c [100.8;101.0] 60.8 (19.0)b [60.0;62.0]
voco_hor
102.1 (42.0)c [101.0;103.4] 70.1 (21.3)d [69.8;71.7]
voco_ver 107.6 (41.3)d [106.3;109.0] 56.1 (16.0)a [55.4;56.9]
CNC 68.1 (20.0)a [67.5;68.7] 67.6 (19.7)c [66.8;68.5]

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE

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