Comparative accuracy of implant impression procedures

Assif, David; Fenton, Aaron; Zarb, George A.; Schmitt, A

doi:10.1097/00008505-199200140-00013

Cited by 49 publications

(91 citation statements)

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“…The usage of the similar metalmodels, in Assif's study (19) , HSU's study (14) and in other studies (20 and 21) are also seen. This could be justified as the stabilization in the base of the model in comparison to acrylic and plaster models.…”

Section: Discussionsupporting

confidence: 57%

Analysing the precision of dental impression on angulated implants using full arch and sectional approaches in the abutment and fixture levels

Nazari¹,

Karamifar²,

Davari³

et al. 2016

Int J Dentistry Res

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Aim and background: The goal of this research is, to study the effect of different dental impression methods in the abutment and fixture levels using the Sectional (SE) and Full Arch (FA) approaches in some implants with internal connectionsas well as different angles of each implant placements on the accuracy of the final casts. Methods and Materials: 4 analogues(implant replicas) were placed on both sides of the imaginary arch (the premolar and the first molar area)in a way that, the opposite side analogues would buccolingually make an angle of 40-60 degreeswhile, each of the analogueswere tilted 10 degreesmesially in their longitudinal axis. The dental impression procedure in both fixture and abutment levels was conducted by the same person using Poly Vinyl Siloxane (PVS). 10 FA and 10 SE dental impressions were taken from each fixture and abutmentlevels. The impressions were castedusingDental Stone Type IV. The center to center distance between the implants (a, b and etc.) along with their angles (θ1, θ2 and etc.) on the initial cast and the duplicated cast were all measured using the Coordinate Measuring Machine (CMM) device in the X-Y-Z axis. The results were analyzed using a statistic software called Statistical Package for the Social Sciences (SPSS 20) based on theT-Test, One-Way ANOVA and Two-Way ANOVA statistical methods. (p<0.05) Results: The results of the Two-Way ANOVA showed a significant difference between the studied groups. (P<0.001) The results of the One-Way ANOVA illustratedchanges of line and angle movements in all positions as (Δa, Δb, Δc, etc.) and (Δθ1, Δθ2, etc.) while, using FA impression in the fixture and the abutment levels showed a significant statistical difference. (P<0.001) The results of the T-Test in the SE approach in two levels of fixture and abutment demonstratedthat, only changes in θ2angle wassignificant, as other changes of (Δf and Δθ1)also showed a significant difference. (P>0.05) Moreover, the SE approach in abutment's level was significantly more precise in accordanceto the fixture level. Conclusion: In angulated implants, it is recommended to make the dental impressionin the abutment level using a sectional approach which, has higher precision.

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Section: Discussionsupporting

confidence: 57%

Analysing the precision of dental impression on angulated implants using full arch and sectional approaches in the abutment and fixture levels

Nazari¹,

Karamifar²,

Davari³

et al. 2016

Int J Dentistry Res

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“…These results agree with previous investigations that emphasized the splinting of impression copings. 13,19,[21][22][23][24][25] The time required for impression making is considerably longer with the splinting methods compared to the nonsplinting methods. However, the splinting procedures have been recommended for maintaining a more precise inter-implant relationship, avoiding rotation of impression copings in the impression during fastening the implant analogue, which is one of the drawbacks of the direct impression method.…”

Section: Discussionmentioning

confidence: 99%

“…10 In some studies, splinting of square transfer copings improved the accuracy of the resulting casts. 13,19,[21][22][23][24][25] Among those studies, several showed that the splinting procedure was essential because unsplinted direct copings exhibited no more accuracy than indirect copings. 13,19 However, others investigators found no improvement with splitting process compared to unsplinted direct 18,[26][27][28] or indirect tecniques.…”

mentioning

confidence: 99%

Accuracy of Definitive Casts Using 4 Implant-Level Impression Techniques in a Scenario of Multi-Implant System With Different Implant Angulations and Subgingival Alignment Levels

et al. 2013

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PURPOSE: To evaluate the effect of various implant-level impression techniques on the accuracy of definitive casts for a multiple internal connection implant system with different implant angulations and subgingival depths. MATERIAL AND METHODS: Six tapered Screw-Vent implants were placed in a reference model with different angles (0, 15, and 30 degrees) and subgingival positions (0, 1, and 3 mm). Twenty medium-consistency polyether impressions of this model were made with 4 techniques (n = 5 per group): (1) indirect technique, (2) unsplinted direct technique, (3) acrylic resin-splinted direct technique, and (4) metal-splinted direct technique. Impressions were poured with type IV dental stone. The interimplant distances were measured for casts using a coordinate measuring machine and the deviations compared with the reference model were calculated. Data were analyzed using intraclass correlation coefficient, ANOVA and Bonferroni test ( = 0.05). RESULTS: Four impression procedures showed significant differences (P = 0.0001). Only group 4 casts showed no significant differences in comparison with the reference model (P = 0.666) (ANOVA repeated measures). CONCLUSIONS: The impression procedure affected the accuracy of definitive casts. The metal-splinted direct technique produced the most accurate casts, followed by acrylic resin-splinted direct, indirect, and unsplinted direct techniques. ABSTRACT (199 words)Purpose To evaluate the effect of four implant-level impression techniques on the accuracy of

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“…2,3 • It has been shown that the pick up type impression coping is the more accurate type of impression as errors occur on removal and replacement of the transfer type impression copings, especially in the occluso-gingival direction. [4][5][6][7] However, there are indications to use of the transfer type impression coping. When there is limited mouth opening they can be used as there may not be sufficient space for access to the screws retaining pick up type impression copings with the impression in place and in patients with an exaggerated gag reflex, when the impression has to be removed as quickly as possible.…”

mentioning

confidence: 99%