scholarly journals Effects of Groove Sealing of the Posterior Occlusal Surface and Offset of the Internal Surface on the Internal Fit and Accuracy of Implant Placements Using 3D-Printed Surgical Guides: An In Vitro Study

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1236
Author(s):  
Jung-Hwa Lim ◽  
Enkhjargal Bayarsaikhan ◽  
Seung-Ho Shin ◽  
Na-Eun Nam ◽  
June-Sung Shim ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Internal Surface ◽  
Three Dimensions ◽  
Surface Shape ◽  
Digital Data ◽  
Surgical Guide ◽  
Implant Placement ◽  
Surgical Guides ◽  
Internal Fit

This study evaluated the internal fit and the accuracy of the implant placement position in order to determine how the surface shape of the tooth and the offset influence the accuracy of the surgical guide. The acquired digital data were analyzed in three dimensions using 3D inspection software. The obtained results confirmed that the internal fit was better in the groove sealing (GS) group (164.45 ± 28.34 μm) than the original shape (OS) group (204.07 ± 44.60 μm) (p < 0.001), and for an offset of 100 μm (157.50 ± 17.26 μm) than for offsets of 30 μm (206.48 ± 39.12 μm) and 60 μm (188.82 ± 48.77 μm) (p < 0.001). The accuracy of implant placement was better in the GS than OS group in terms of the entry (OS, 0.229 ± 0.092 mm; GS, 0.169 ± 0.061 mm; p < 0.001), apex (OS, 0.324 ± 0.149 mm; GS, 0.230 ± 0.124 mm; p < 0.001), and depth (OS, 0.041 ± 0.027 mm; GS, 0.025 ± 0.022 mm; p < 0.001). In addition, the entries (30 μm, 0.215 ± 0.044 mm; 60 μm, 0.172 ± 0.049 mm; 100 μm, 0.119 ± 0.050 mm; p < 0.001) were only affected by the amount of offset. These findings indicate that the accuracy of a surgical guide can be improved by directly sealing the groove of the tooth before manufacturing the surgical guide or setting the offset during the design process.

Accuracy of Different Surgical Guide Designs for Static Computer-Assisted Implant Surgery: An in vitro Study

2021 ◽  
Author(s):  
Yu Tsung Wu ◽  
Panos Papaspyridakos ◽  
Kiho Kang ◽  
Matthew Finkelman ◽  
Yukio Kudara ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Computer Assisted ◽  
Surgical Guide ◽  
Implant Placement ◽  
Surgical Guides ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2

The aims of this study were to evaluate the effect of (i) the different surgical guide designs and (ii) implant placement location on the accuracy of fully guided implant placement in single edentulous sites using an in vitro study model. Forty-five partially edentulous models were scanned and divided into three groups: group 1, tooth-supported full-arch surgical guide; group 2, three different tooth-supported shortened surgical guides (SSGs); and group 3, tooth-supported full-arch surgical guide with a crossbar. All surgical guides were printed and used for fully guided implant placement. A total of 180 implants (60 per group) were placed, and scanbodies were positioned on all models, and postoperative surface scan files (STL) files were obtained. Superimposition of preoperative and postoperative STL files was performed, and the accuracy of implant position was evaluated. The interaction between group and implant location was statistically significant for angle, 3D offset at the base, and at the tip (p&lt;0.001). The post-hoc tests showed a statistically significantly higher deviation for group 2 compared to group 3 for all outcomes for implants #4 (p&lt;0.05) and #7 (p&lt;0.05). There was also a statistically significant difference in all outcomes between groups 1 and 3 for implant #7 (p&lt;0.05). All surgical guide designs presented satisfactory performance with clinically acceptable levels of deviation. However, SSGs presented higher accuracy for guided implant placement in a single-edentulous site, whereas a full-arch surgical guide with a crossbar presented superior outcomes when two or more guided implants were placed simultaneously.

Accuracy of implant placement using precision surgical guides with varying occlusogingival heights: An in vitro study

2009 ◽  
Vol 101 (6) ◽  
pp. 372-381 ◽  
Author(s):  
Chanseop Park ◽  
Ariel J. Raigrodski ◽  
Jacob Rosen ◽  
Charles Spiekerman ◽  
Robert M. London
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Implant Placement ◽  
Surgical Guides

scholarly journals Effect of the use of a surgical guide on heat generation during implant placement: A comparative in vitro study

2021 ◽  
Vol 58 (1) ◽  
pp. 55-59
Author(s):  
Khaldoun ALhroob ◽  
Mohammed Monzer Alsabbagh ◽  
Aghiad Yassin Alsabbagh
Keyword(s):  
Heat Generation ◽  
In Vitro Study ◽  
Vitro Study ◽  
Surgical Guide ◽  
Implant Placement

scholarly journals Accuracy of Implant Position Reproduction According to Exposed Length of the Scan Body during Optical Scanning: An In Vitro Study

2021 ◽  
Vol 11 (4) ◽  
pp. 1689
Author(s):  
Na-Eun Nam ◽  
Seung-Ho Shin ◽  
Jung-Hwa Lim ◽  
Bora Lee ◽  
June-Sung Shim ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Three Dimensions ◽  
Lateral Incisor ◽  
Implant Position ◽  
Optical Scanner ◽  
Implant Placement ◽  
Bone Level ◽  
Scan Data ◽  
Mean Square Errors

Accuracy of implant position reproduction according to various types of scanners, implant placement depths, and tooth positions are unknown. The purpose of this study was to compare the accuracy of implant position reproduction for differences in the exposed length of the implant scan body according to scanner type and tooth position. Implants were placed at the positions of the lateral incisor, first premolar, and first molar in the study model at the bone level and submerged 1.5 mm, 3.0 mm, 4.5 mm, and 6.0 mm. The completed models were scanned with one type of tabletop scanner and three types of intraoral scanners (TRIOS 3, i500, and CS3600). A matching process was performed for all scan data to superimpose abutment library data on the scan body, and the root mean square errors were analyzed in three dimensions to evaluate the position reproducibility of the replaced abutment library. In the trueness analysis, the error increased rapidly for an implant placement depth of 4.5 mm, and was largest for a submersion of 6.0 mm. The precision analysis confirmed that the error increased for depths of at least 3.0 mm. The analysis by position identified that the accuracy was lowest for an implant placed at the position of the lateral incisor. These findings indicate that special care is required when making an impression of a deep implant with an optical scanner.

scholarly journals The effect of off-axis seating on the marginal adaptation of full coverage all ceramic crowns

2020 ◽  
Vol 75 (6) ◽  
pp. 303-310
Author(s):  
George P Babiolakis ◽  
C Peter Owen
Keyword(s):  
In Vitro Study ◽  
Axial Direction ◽  
Three Dimensions ◽  
Marginal Gap ◽  
Cad Cam ◽  
3D Printed ◽  
Ceramic Crowns ◽  
Crown Preparation ◽  
Internal Fit

INTRODUCTION: No studies on the marginal gap or internal fit of crowns have reported the effect of non-axial seating which may often occur inadvertently clinically. AIM: Therefore this in vitro study sought to investigate the off-axis seating of CAD/CAM crowns and its effect on the marginal gap and internal fit. METHOD: A standardised crown preparation on a typodont tooth was used to design and mill 30 crowns with a flat occlusal surface. Ten Zirconia (Dentsply Sirona, Germany), 10 Enamic (Vita, Austria), and 10 Brilliant Crios (Coltene, Switzerland) crowns were milled, Ave of each milled with a luting space of 100µm, and Ave of 200µm. The marginal gap was measured in two and three dimensions after luting with silicone on a 3D-printed metal replica. Seating occurred axially, at 5° buccally and 5° lingually. The silicone was used to calculate the internal fit RESULTS: Axial seating with a 100 µm luting space obtained the smallest marginal gap, irrespective of material or luting space. 3D measurements were larger than 2D measurements, but not significantly. The maximum off-axis gap was 117µm, on the opposite side to which pressure was applied. CONCLUSIONS: Care must be taken clinically to ensure that luting takes place in an axial direction only.

Precision of Implant Placement With Stereolithographic Templates: A Pilot In Vitro Study

2012 ◽  
Vol 38 (5) ◽  
pp. 569-574 ◽  
Author(s):  
Hakan Bilhan ◽  
Selda Arat ◽  
Emre Mumcu ◽  
Onur Geckili ◽  
Olcay Şakar
Keyword(s):  
Vertical Direction ◽  
In Vitro Study ◽  
3 Dimensional ◽  
Implant Placement ◽  
Surgical Guides ◽  
Human Cadavers ◽  
Surgical Templates ◽  
Formalin Fixed ◽  
Stereolithographic Models

This pilot study assesses the accuracy of 2 bone-supported stereolithographic surgical templates with respect to placement of implants in originally planned positions, and it tests the precision of dental volumetric tomography planning. Two mandibles retrieved from formalin-fixed human cadavers were scanned by dental volumetric tomography for planning of the implant positions, leading to stereolithographic models and fabrication of surgical guides. The situation immediately following drilling and implant insertion by an experienced surgeon was scanned and the outcome compared with the initial planning. The 3-dimensional discrepancies were then analyzed and determined. The results show deviations of the placed implants from the original planning, especially in the vertical direction, making the seating of a prefabricated denture impossible. At present, the flapless surgery technique based on stereolithographic surgical templates appears unsafe; further improvement is required.

scholarly journals Comparison of Time Required for Guided Implant Site Preparation with Two Different Template Designs and Dedicated Surgical Kits: An In Vitro Study

2020 ◽  
Author(s):  
Łukasz Zadrożny ◽  
Marta Czajkowska ◽  
Eitan Mijiritsky ◽  
Marco Tallarico ◽  
Leopold Wagner
Keyword(s):  
Surgical Procedure ◽  
Three Dimensional ◽  
In Vitro Study ◽  
Site Preparation ◽  
Vitro Study ◽  
Surgical Guide ◽  
Surgical Guides ◽  
Time Required ◽  
Implant Site Preparation

Both types of surgical guides &ndash; with and without metal sleeves are founded beneficial in clinical studies. The aim of this in vitro study was to compare time of surgical procedure in dental implantology depending of used type of the surgical guide. Ten three dimensional (3D) printed models of lower jaws were prepared based on complete virtual model of patient clinical conditions with missing teeth 37, 46 and 47. Five of this models were used for implant sites preparation performed with use of surgical guide without metal sleeves and dedicated surgical kit, and next five were used for the same procedure performed with surgical guide with metal sleeves and dedicated surgical kit. Time of implant site preparation were measured and noted. Statistical analysis was performed using Student&rsquo;s t test for independent samples. Difference of time in both groups were founded as statistically significant (t=-9.94; df =28; p=0.0000). Type of surgical guide is important factor which can impact on time of implant site preparation and all surgical procedure.

scholarly journals Marginal and Internal Fit of Ceramic Prostheses Fabricated from Different Chairside CAD/CAM Systems: An In Vitro Study

2021 ◽  
Vol 11 (2) ◽  
pp. 857
Author(s):  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
Computer Aided Design ◽  
In Vitro Study ◽  
Vitro Study ◽  
Marginal Gap ◽  
Significant Difference ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Cam Systems

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS PO (DDS), and CS3500 (Carestream)). Ceramic crowns were fabricated using the CAD/CAM process recommended by each system (CEREC, EZIS, and Carestream systems; N = 15). The 3-dimensional (3D) marginal and internal fit of each ceramic crown was measured using a 3D inspection software (Geomagic control X). Differences among the systems and various measurements were evaluated using the Kruskal–Wallis test. Statistically significant differences were validated using pairwise comparisons (α = 0.05). Occlusal gaps in the CEREC, EZIS, and Carestream groups were 113.0, 161.3, and 438.2 µm, respectively (p < 0.001). The axial gaps were 83.4, 78.0, and 107.9 µm, respectively. The marginal gaps were 77.8, 99.3, and 60.6 µm, respectively, and the whole gaps were 85.9, 107.3, and 214.0 µm, respectively. Significant differences were observed with the EZIS system compared with the other two systems in terms of the marginal gap sizes. The CEREC system showed no significant differences among the four measured regions. However, the EZIS and Carestream systems did show a statistically significant difference (p < 0.05). All three systems were judged to be capable of fabricating clinically acceptable prostheses, because the marginal gap, which is the most important factor in the marginal fit of prostheses, was recorded to be below 100 µm in all three systems.

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