scholarly journals In Vitro Comparison between Metal Sleeve-Free and Metal Sleeve-Incorporated 3D-Printed Computer-Assisted Implant Surgical Guides

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 615
Author(s):  
Kyung Chul Oh ◽  
June-Sung Shim ◽  
Ji-Man Park
Keyword(s):  
Computer Assisted ◽  
Cross Sectional ◽  
Implant Placement ◽  
Surgical Guides ◽  
Measured Weight ◽  
Before And After ◽  
3D Printed ◽  
Student’S T ◽  
The Right

The present study aims to compare the accuracy of metal sleeve-free 3D-printed computer-assisted implant surgical guides (MSF group) (n = 10) with metal sleeve-incorporated 3D-printed computer-assisted implant surgical guides (MSI group) (n = 10). Implants of diameter 4.0 mm and 5.0 mm were placed in the left second premolars and bilateral first molars, respectively, using a fully guided system. Closed-form sleeves were used in teeth on the left and open-form sleeves on the right. The weight differences of the surgical guides before and after implant placement, and angular deviations before and after implant placement were measured. Weight differences were compared with Student’s t-tests and angular deviations with Mann–Whitney tests. Cross-sectional views of the insert parts were observed with a scanning electron microscope. Preoperative and postoperative weight differences between the two groups were not statistically significant (p = 0.821). In terms of angular deviations, those along the mesiodistal direction for the left second premolars were significantly lower in the MSF group (p = 0.006). However, those along the mesiodistal direction for the bilateral molars and those along the buccolingual direction for all teeth were not significantly different (p > 0.05). 3D-printed implant surgical guides without metal sleeve inserts enable accurate implant placement without exhausting the guide holes, rendering them feasible for fully guided implant placement.

Computer-assisted template-guided custom-designed 3D-printed implant placement with custom-designed 3D-printed surgical tooling: an in-vitro proof of a novel concept

2016 ◽  
Vol 28 (5) ◽  
pp. 582-585 ◽  
Author(s):  
David Anssari Moin ◽  
Wiebe Derksen ◽  
Hugo Waars ◽  
Bassam Hassan ◽  
Daniel Wismeijer
Keyword(s):  
Computer Assisted ◽  
Implant Placement ◽  
3D Printed ◽  
Novel Concept

scholarly journals Accuracy of Customized Prefabricated Screw-Type Immediate Provisional Restorations after Single-Implant Placement

2019 ◽  
Vol 8 (4) ◽  
pp. 490 ◽  
Author(s):  
Kyung Chul Oh ◽  
Jee-Hwan Kim ◽  
Chang-Woo Woo ◽  
Hong Seok Moon
Keyword(s):  
Computer Aided Design ◽  
Computer Assisted ◽  
Angular Deviation ◽  
Intraoral Scanner ◽  
Planning Stage ◽  
Implant Placement ◽  
Surgical Guides ◽  
Planning Software ◽  
Single Implant

Limited evidence is available comparing the differences between pre-operative and post-operative 3D implant positions from the viewpoint of prosthetics. We aimed to investigate the differences between preplanned positions of virtual provisional restorations and their actual positions following fully guided single-implant placement. Ten maxillary typodonts with missing right central incisors were imaged using cone-beam computed tomography, and digital impressions were obtained using an intraoral scanner. These data were imported into implant-planning software, following which the provisional restorations were designed. After data superimposition, an appropriate implant position was determined, and a computer-assisted implant surgical guide was designed for each typodont. Orders generated from the implant-planning software were imported into relevant computer-aided design software to design the custom abutments. The abutments, provisional restorations, and surgical guides were fabricated, and each restoration was cemented to the corresponding abutments, generating a screw-type immediate provisional restoration. The implants were placed using the surgical guides, and the screw-type provisional restorations were engaged to the implants. The typodonts were then rescanned using the intraoral scanner. The restorations designed at the treatment planning stage were compared with those in the post-operative scan using metrology software. The angular deviation around the central axis of the implant was measured, and the differences in the crown position were converted to root mean square (RMS) values. The post-operative provisional restorations exhibited an absolute angular deviation of 6.94 ± 5.78° and an RMS value of 85.8 ± 20.2 µm when compared with their positions in the pre-operative stage. Within the limitations of the present in vitro study, the results highlight the potential application of customized prefabricated immediate provisional restorations after single-implant placement.

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<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<0.05) and #7 (p<0.05). There was also a statistically significant difference in all outcomes between groups 1 and 3 for implant #7 (p<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.

scholarly journals Accuracy of Guided Implant Surgery in the Edentulous Jaw Using Desktop 3D-Printed Mucosal Supported Guides

2021 ◽  
Vol 10 (3) ◽  
pp. 391
Author(s):  
Rani D’haese ◽  
Tom Vrombaut ◽  
Geert Hommez ◽  
Hugo De Bruyn ◽  
Stefan Vandeweghe
Keyword(s):  
In Vitro Study ◽  
Angular Deviation ◽  
Implant Surgery ◽  
Implant Position ◽  
Surgical Guides ◽  
Negative Effect ◽  
Bone Level ◽  
3D Printed ◽  
Implant Alignment

Purpose: The aim of this in vitro study is to evaluate the accuracy of implant position using mucosal supported surgical guides, produced by a desktop 3D printer. Methods: Ninety implants (Bone Level Roxolid, 4.1 mm × 10 mm, Straumann, Villerat, Switzerland) were placed in fifteen mandibular casts (Bonemodels, Castellón de la Plana, Spain). A mucosa-supported guide was designed and printed for each of the fifteen casts. After placement of the implants, the location was assessed by scanning the cast and scan bodies with an intra-oral scanner (Primescan®, Dentsply Sirona, York, PA, USA). Two comparisons were performed: one with the mucosa as a reference, and one where only the implants were aligned. Angular, coronal and apical deviations were measured. Results: The mean implant angular deviation for tissue and implant alignment were 3.25° (SD 1.69°) and 2.39° (SD 1.42°) respectively, the coronal deviation 0.82 mm (SD 0.43 mm) and 0.45 mm (SD 0.31 mm) and the apical deviation 0.99 mm (SD 0.45 mm) and 0.71 mm (SD 0.43 mm). All three variables were significantly different between the tissue and implant alignment (p < 0.001). Conclusion: Based on the results of this study, we conclude that guided implant surgery using desktop 3D printed mucosa-supported guides has a clinically acceptable level of accuracy. The resilience of the mucosa has a negative effect on the guide stability and increases the deviation in implant position.

scholarly journals In-house 3D-printed surgical guides for osseous lesions of the lower jaw: an experimental study

2021 ◽  
Vol 26 (1) ◽  
Author(s):  
Lukas Postl ◽  
Thomas Mücke ◽  
Stefan Hunger ◽  
Oliver Bissinger ◽  
Michael Malek ◽  
...  
Keyword(s):  
Control Group ◽  
Head Model ◽  
Computer Assisted ◽  
3D Printer ◽  
Surgical Guide ◽  
Surgical Guides ◽  
Lower Jaw ◽  
Bony Lesion ◽  
3D Printed ◽  
Phantom Head

Abstract Background The accuracy of computer-assisted biopsies at the lower jaw was compared to the accuracy of freehand biopsies. Methods Patients with a bony lesion of the lower jaw with an indication for biopsy were prospectively enrolled. Two customized bone models per patient were produced using a 3D printer. The models of the lower jaw were fitted into a phantom head model to simulate operation room conditions. Biopsies for the study group were taken by means of surgical guides and freehand biopsies were performed for the control group. Results The deviation of the biopsy axes from the planning was significantly less when using templates. It turned out to be 1.3 ± 0.6 mm for the biopsies with a surgical guide and 3.9 ± 1.1 mm for the freehand biopsies. Conclusions Surgical guides allow significantly higher accuracy of biopsies. The preliminary results are promising, but clinical evaluation is necessary.

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.

Effect of unweighting on skeletal muscle use during exercise

1995 ◽  
Vol 79 (1) ◽  
pp. 168-175 ◽  
Author(s):  
L. L. Ploutz-Snyder ◽  
P. A. Tesch ◽  
D. J. Crittenden ◽  
G. A. Dudley
Keyword(s):  
Lower Limb ◽  
Weight Bearing ◽  
Muscle Group ◽  
Mr Images ◽  
Cross Sectional ◽  
Quadriceps Femoris Muscle ◽  
Before And After ◽  
Exercise Induced ◽  
The Right ◽  
Femoris Muscle

Exercise-induced spin-spin relaxation time (T2) shifts in magnetic resonance (MR) images were used to test the hypothesis that more muscle would be used to perform a given submaximal task after 5 wk of unweighting. Before and after unilateral lower limb suspension (ULLS), 7 subjects performed 5 sets of 10 unilateral concentric actions with the quadriceps femoris muscle group (QF) at each of 4 loads: 25, 40, 55, and 70% of maximum. T2-weighted MR images of the thigh were collected at rest and after each relative load. ULLS elicited a 20% decrease in strength of the left unweighted QF and a 14% decrease in average cross-sectional area (CSA) with no changes in the right weight-bearing QF. Average CSA of the left or right QF showing exercise-induced T2 shift increased as a function of exercise intensity both before and after ULLS. On average, 12 +/- 1, 15 +/- 2, 18 +/- 2, and 22 +/- 1 cm2 of either QF showed elevated T2 for the 25, 40, 55, and 70% loads, respectively, before ULLS. Average CSA of the left but not the right QF, showing elevated T2 after ULLS, was increased to 16 +/- 2, 23 +/- 3, 31 +/- 7, and 39 +/- 5 cm2, respectively. The results indicated that unweighting increased exercise-induced T2 shift in MR images, presumably due to greater muscle mass involvement in exercise after than before unweighting, suggesting a change in motor control.

scholarly journals PENGARUH PENDEKATAN MELALUI KONSELING INTERPERSONAL TERHADAP RESPON SOSIAL, EMOSIONAL DAN SPIRITUAL PADA PASIEN HIV/AIDS

2020 ◽  
Vol 8 (1) ◽  
pp. 62
Author(s):  
Indah Jayani ◽  
Fatma Sayekti Ruffaida
Keyword(s):  
Opportunistic Infections ◽  
Sampling Technique ◽  
Wilcoxon Test ◽  
P Value ◽  
Social Emotional ◽  
Aids Patients ◽  
Cross Sectional ◽  
Before And After ◽  
The Right ◽  
Hiv Aids

Approach to PLWHA by providing interpersonal counseling is the right thing to do to overcome psychological problems including social, emotional and spiritual aspects of PLWHA. This study aims to look at the effect of interpersonal counseling on social, emotional and spiritual responses in HIV/ AIDS patients. This research is a type of non-experimental research with a cross-sectional approach. The sample is post-test people and tested positive for HIV in the Kediri region, which is 32 with purpossive sampling technique. Data on social, emotional and spiritual responses were obtained based on the results of data recapitulation from the instrument in the form of a questionnaire. The results of the study with the non-parametric Wilcoxon test showed there were differences between social responses of HIV/AIDS patients before and after given interpersonal counseling with p value = 0,000, there were differences between the emotional responses of HIV/AIDS patients before being given interpersonal counseling and after being given counseling with p value = 0,000, and there is a difference between spiritual responses in HIV/AIDS patients before being given interpersonal counseling and after being given interpersonal counseling with p value = 0,000. It can be concluded that interpersonal counseling influences social, emotional and spiritual responses of HIV/AIDS patients. It is recommended that the mentoring of HIV/AIDS patients through interpersonal counseling can continue so as to enhance physiological responses that will have an impact on disease prognosis, prevention of opportunistic infections and reduce mortality rates for HIV patients/ AIDS.

scholarly journals Craniometric study of the Orbital Index in brazilian skulls

2021 ◽  
Vol 69 ◽  
Author(s):  
Larissa Chaves Cardoso FERNANDES ◽  
Patrícia Moreira RABELLO ◽  
Bianca Marques SANTIAGO ◽  
Marcus Vitor Diniz de CARVALHO ◽  
Manoel Raimundo de SENA JÚNIOR ◽  
...  
Keyword(s):  
Mixed Race ◽  
Cross Sectional Study ◽  
Southeastern Brazil ◽  
Cross Sectional ◽  
Significance Level ◽  
Brazilian Sample ◽  
Significant Difference ◽  
Student’S T ◽  
The Right ◽  
Student’S T Test

ABSTRACT Objetive To determine the percentage of correctness of the Orbital Index (OI) for estimation of sex, ancestry and age in Brazilian skulls. Methods Cross-sectional study of 183 human dry skulls from the southeastern Brazil. A total of 100 skeletons were males and 83 females; of which 36 were aged up to 39 years, 60 aged between 40 and 59 years, and 87 aged 60 years or older. As for ancestry, 103 were from white, 51 mixed race, and 29 black individuals. The OI was calculate by the formula = height/width x 100. The data were submitted to Student’s t test, F (ANOVA), Tukey and Kruskal Wallis tests as well as to discriminant analysis, with a 5% significance level. Results The sample was characterized as mesoseme, with a mean age of 56.62 (±19.97) years. No significant difference was observed (p=0.511) between the OI in females (right: 86.43 ± 6.58 and left: 86.70 ± 5.93) and males (right: 85.78 ± 6.69 and left: 86.37 ± 6.20). There were no significant differences between age, ancestry and the variables analyzed (p>0.05). The right and left orbital widths were significantly dimorphic between sexes (p<0.001). The percentage of correctness of the method for estimation of sex, age and ancestry was found to be 65.6%, 43.7%, and 43.6%, respectively. Conclusions The OI is not an appropriate method for estimation of sex, ancestry and estimation of age in this Brazilian sample. The methodology should be expanded to other population groups so that it can be improved.

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