Effect Of Combinations Of Pick-Up And Transfer Impression Coping In Non-Parallel Implants On Three-Dimensional Accuracy Of The Implant Impression - An In Vitro Study

Implant Impression, Pick-Up Coping, Transfer Coping, Non-Parallel Implants, ThreeDimensional Accuracy

Dr. C. Kameswari1*
MDS (Prosthodontics)
Designation: Assistant Professor
Affiliation: Army College of Dental Sciences,
Secunderabad
Email: drckameswari@gmail.com , ORCID
iD : 0009-0002-8760-0107

Dr. Suresh Sajjan2
MC, MDS (Prosthodontics)
Designation: Former Principal
Affiliation: Vishnu Dental College,
Bhimavaram
Email: sajjanprostho@gmail.com ,ORCID iD

Dr. B. V. H. Raviteja3
MDS (Prosthodontics)
Designation: Assistant Professor
Affiliation: Army College of Dental Sciences,
Secunderabad
Email: bvhraviteja@gmail.com ,ORCID
iD :0000- 0002-9701-9415

Dr. Priyanka Rai4
MDS (Prosthodontics)
Designation: Associate Professor
Affiliation: Army College of Dental Sciences,
Secunderabad
Email:
drpriyankarai.prostho@gmail.com ,ORCID
iD :0009-0007-2352-5634

Dr. Sravanthi Ennala5
MDS (Prosthodontics)
Designation: Assistant Professor
Affiliation: Army College of Dental Sciences,
Secunderabad
Email: sravanthiennala5@gmail.com ,ORCID
iD :0009-0000-2574-2252

European Journal of Prosthodontics and Restorative Dentistry (2026) 34 (4s), 467-474

Effect Of Combinations Of
Pick-Up
And
Transfer
Impression Coping In NonParallel Implants On ThreeDimensional Accuracy Of The
Implant Impression - An In
Vitro Study

A correct implant impression is crucial for transferring the position of the implants to the working cast and for achieving a passive fit of an implantsupported prosthesis. Non-parallel implants can pose impression challenges due to guide-pin interference, incomplete seating of copings, and distortion when taking impressions. The in vitro study in the present work assessed the accuracy of combined pick-up and transfer impression copings for simulated non-parallel implant situations. Two stainless-steel master models were created: one straight and one 15° angulated implant analogue, and the other two converging 15° angulated implant analogues. 48 polyether impressions were taken and 6 groups were set up based on coping combinations and in custom trays. Experimental casts were cast with type IV die stone and evaluated by a coordinate measuring machine. One-way analysis of variance (ANOVA) and post hoc Tukey's test were used to statistically compare mean deviations and inter-abutment distances. The smallest inter-abutment deviation was observed in the case of transfer-onstraight and pick-up-on-angulated combination in the straight angulated model. The model with convergence-angulated pick-up and transfer exhibited the minimum numerical difference. No statistically significant difference was however observed among the groups. Coping strategies can be used together and offer similar accuracy in non-parallel implant impression.

Dr. Vimal Kumar6 MDS (Prosthodontics) Designation: Assistant Professor Affiliation: Army College of Dental Sciences, Secunderabad Email: dr.vimalsachan@gmail.com,ORCID iD :0009-0004-6188-0707

Received-13-05-2026 Revised-17-06-2026 Accepted-23-06-2026

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