which type  of attachments do you mean?

Actually, there is controversially saying regarding this issue, but it can be said that you can not use the natural teeth and implant as abutments in the same time for all cases due to the lack of the space around the implant which, in natural teeth, occupied by the periodontal ligament which in turn play the most important role in distributing the occlusal and masticatory forces.

Please, read:

https://www.periosouth.org/userfiles/files/WS11/Publications%20from%20WS11/TISP.pdf

thank you doctors for your answer but maybe my question was not clear, 

I'm asking about using implant and teeth as abutment retained attachment for the same Removable denture, 

case scenario: maxillary class I Kennedy classification with remaining anteriors teeth i will use one canine to carry extracoronal attachment and the other canine which it's implant to carry crown with the another attachment for esthetic reason? is it possible or its better to put locator attachment on implant canine ? 

It has been conclusively shown that a FIXED bridge on both implant and natural teeth is problematic within a few years. Thus, by extrapolation, I would be very hesitant to use a mixed implant-natural retention platform for a REMOVABLE appliance. 

Since natural teeth are inherently more mobile than implants, mixed retention will put high stresses on the implant. How about planning for an additional implant, and retention of the partial on the implants ONLY?

I can clinically confirm that removable appliance with implant/natural retentions is a failing approach in the short term

thanks Dr Canullo but can you explain how and why? 

natural teeth and implants have clinically different mobility. this leads to overload implants without no need to include natural teeth in the appliance

You better do not put tooth and implant as a abutments for overdenture. Implant will fail

Thank you dear Dr. Elson but can you support your opinion with any study and why the implant not the tooth ? 

There are a variety of studies to support the feasibility of implant and tooth supported removable partial dentures

Clinical Outcome of Double Crown-Retained Mandibular Removable Dentures Supported by a Combination of Residual Teeth and Strategic Implants.

Rinke S, Ziebolz D, Ratka-Krüger P, Frisch E.

J Prosthodont. 2014 Sep 14. doi: 10.1111/jopr.12214. [Epub ahead of print

Unsplinted implants and teeth supporting maxillary removable partial dentures retained by telescopic crowns: a retrospective study with >6 years of follow-up.

Frisch E, Ratka-Krüger P, Wenz HJ.

Clin Oral Implants Res. 2014 Apr 16. doi: 10.1111/clr.12407. [Epub ahead of print]

Implant retention and support for distal extension partial removable dental prostheses: satisfaction outcomes.

Gonçalves TM, Campos CH, Garcia RC.

J Prosthet Dent. 2014 Aug;112(2):334-9

Implant Tooth-Supported Removable Partial Denture with at Least 15-Year Long-Term Follow-Up.

Mijiritsky E, Lorean A, Mazor Z, Levin L.

Clin Implant Dent Relat Res. 2013 Dec 27. doi: 10.1111/cid.12190. [Epub ahead of

Prognosis of implants and abutment teeth under combined tooth-implant-supported and solely implant-supported double-crown-retained removable dental prostheses.

Rammelsberg P, Bernhart G, Lorenzo Bermejo J, Schmitter M, Schwarz S.Clin Oral Implants Res. 2014 Jul;25(7):813-8.

Survival of double-crown-retained dentures either tooth-implant or solely implant-supported: an 8-year retrospective study.

Schwarz S, Bernhart G, Hassel AJ, Rammelsberg P.

Clin Implant Dent Relat Res. 2014 Aug;16(4):618-25.

Implant placement under existing removable dental prostheses and its effect on oral health-related quality of life.

Wolfart S, Moll D, Hilgers RD, Wolfart M, Kern M.

Clin Oral Implants Res. 2013 Dec;24(12):1354-9

Dental implants as strategic supplementary abutments for implant-tooth-supported telescopic crown-retained maxillary dentures: a retrospective follow-up study for up to 9 years.

Krennmair G, Krainhöfner M, Waldenberger O, Piehslinger E.

Int J Prosthodont. 2007 Nov-Dec;20(6):617-22.

Removable dentures with implant support in strategic positions followed for up to 8 years.

Kaufmann R, Friedli M, Hug S, Mericske-Stern R.

Int J Prosthodont. 2009 May-Jun;22(3):233-41; discussion 242

Use of dental implants to improve unfavorable removable partial denture design.

Mijiritsky E, Ormianer Z, Klinger A, Mardinger O.

Compend Contin Educ Dent. 2005 Oct;26(10):744-6, 748, 750 passim

Please dont?? There is equal amount of literature supporting the against theory. Most of these talk about potential intrusion of joined natural tooth. 

Hi, Dr. Hasan. I´m a maxillofacial prosthetics student and I don´t have a formed opinion about it yet. Please, if you can list the articles as Dr. Stern did, it would help me to transfer this knowledge to the mutillated patient reality. Thanks.

You can also consider the review paper by  Garry Greenstein et al 2009, on connectng teeth with implants by fixed prostheses. Here some concerns and possible solutions and guidelines are given

Clinical Oral Implants Research > Vol 25 Issue > Abstract

610 Poster

The influence of bone's elasticity on the apical migration of a natural tooth connected to an osseointegrated implant with various attachments. 3D FEA

D. Giannopoulos1, A. Tsouknidas2, K. Michalakis3,4, E. Lympoudi5, N. Michailidis6, A. Pissiotis7

Implant Dentistry:

June 2014 - Volume 23 - Issue 3 - p 253-257

doi: 10.1097/ID.0000000000000101

Clinical Science and Techniques

Risks and Benefits of Connecting an Implant and Natural Tooth

Davis, Steven M. DDS, MSc*; Plonka, Alexandra B. DDS*; Wang, Hom-Lay DDS, MSD, PhD†

Intrusion phenomenon in combination tooth-implant restorations: A review of the literature ☆ ☆☆ ★ ★★ ♢ ♢♢

Trudy L. Schlumberger, DDS, MSa, John F. Bowley, DDS, MSb, Glenn I. Maze, DDSc

Show more

DOI: 10.1016/S0022-3913(98)70110-6

Retrospective evaluation of complete-arch fixed partial dentures connecting teeth and implant abutments in patients with normal and reduced periodontal support

Luca Cordaro, MD, DDS, PhDa, , , Carlo Ercoli, DDSb, Carlo Rossini, DDSc, Ferruccio Torsello, DDSd, Changyong Feng, PhDe

Show more

DOI: 10.1016/j.prosdent.2005.08.007

thanks Dr Hasan but all were talking about fixed supported by tooth / implant not removable retained by tooth / implant ? 

My apologies. Tunnel vision

Regina Dorothea Mericske-Stern has forwarded the best available answer that is based on research and science. The question is debatable and best answer would be a matter of your choice, just go through the different articles of Dr. Regina then choose your answer.

Fully agree with prof. Mericske-Stern

Hola , para el 2020 las cosas han cambiado respecto a este tema?