Effect of different mucosa thickness and resiliency on stress distribution of implant-retained overdentures-2D FEA

The study aimed to evaluate the effect of different mucosa thickness and resiliency on stress distribution of implant-retained overdentures using a two-dimensional finite element analysis. Models were used in order to simulate two situations. In group A, model represented an edentulous mandible supporting an overdenture retained by two-splinted-implants connected with bar-clip system while in group B, model simulated an edentulous mandible supporting an overdenture retained by two-splinted-implants connected with bar-clip system associated with two-distally placed o'ring system. In each group, mucosa assumed three characteristics of thickness (1, 3 and 5 mm) in the resiliencies: hard, resilient and soft, respectively. Evaluation was performed on Ansys software. Group A showed higher stress values regardless of the mucosa characteristics. Overall, stress decreased at the supporting tissues as mucosa thickness and resiliency increased. Regarding supporting tissues, cortical bone showed the highest stress values. The use of bar-clip attachment system with distally placed o'ring attachment design optimized the stress distribution.

[1]  R. Mericske-Stern,et al.  Overdentures: an alternative implant methodology for edentulous patients. , 1993, The International journal of prosthodontics.

[2]  A. Sertgöz,et al.  Finite element analysis of the effect of cantilever and implant length on stress distribution in an implant-supported fixed prosthesis. , 1996, The Journal of prosthetic dentistry.

[3]  Z Ben-Ur,et al.  Anterior implant-supported overdentures. , 1996, Quintessence international.

[4]  H Spiekermann,et al.  A 10-year follow-up study of IMZ and TPS implants in the edentulous mandible using bar-retained overdentures. , 1995, The International journal of oral & maxillofacial implants.

[5]  A. van der Bilt,et al.  Retention and postinsertion maintenance of bar-clip, ball and magnet attachments in mandibular implant overdenture treatment: an in vivo comparison after 3 months of function. , 2003, Clinical oral implants research.

[6]  H. Hirayama,et al.  Attachment Systems for Implant Retained Overdentures: A Literature Review , 2006, Implant dentistry.

[7]  Alper Çağlar,et al.  Effects of mesiodistal inclination of implants on stress distribution in implant-supported fixed prostheses. , 2006, The International journal of oral & maxillofacial implants.

[8]  Ignace Naert,et al.  The McGill consensus statement on overdentures. , 2003, Quintessence international.

[9]  Anita Visser,et al.  Mandibular overdentures supported by two or four endosseous implants: a 10-year clinical trial. , 2009, Clinical oral implants research.

[10]  J. Kuiper,et al.  Stress distribution around dental implants: influence of superstructure, length of implants, and height of mandible. , 1992, The Journal of prosthetic dentistry.

[11]  J A Hobkirk,et al.  Mandibular deformation in subjects with osseointegrated implants. , 1991, The International journal of oral & maxillofacial implants.

[12]  H P Weber,et al.  Overdenture attachment selection and the loading of implant and denture-bearing area. Part 2: A methodical study using five types of attachment. , 2001, Clinical oral implants research.

[13]  Kiyoshi Koyano,et al.  In vitro study of a mandibular implant overdenture retained with ball, magnet, or bar attachments: comparison of load transfer and denture stability. , 2003, The International journal of prosthodontics.

[14]  A. Caputo,et al.  Stress transfer of four mandibular implant overdenture cantilever designs. , 2004, The Journal of prosthetic dentistry.

[15]  T. Ichikawa,et al.  In vitro study of mandibular implant-retained overdentures: the influence of stud attachments on load transfer to the implant and soft tissue. , 1996, The International journal of prosthodontics.

[16]  Bulent Uludag,et al.  Photoelastic stress analysis of various retention mechanisms on 3-implant-retained mandibular overdentures. , 2007, The Journal of prosthetic dentistry.

[17]  G Dubois,et al.  A complete finite element model of a mandibular implant-retained overdenture with two implants: comparison between rigid and resilient attachment configurations. , 2008, Medical engineering & physics.

[18]  H. Meijer,et al.  The incomprehensible success of the implant stabilised overdenture in the edentulous mandible: a literature review on transfer of chewing forces to bone surrounding implants. , 1995, The European journal of prosthodontics and restorative dentistry.

[19]  J. Lindhe,et al.  Bone reactions adjacent to titanium implants subjected to static load of different duration. A study in the dog (III). , 2001, Clinical oral implants research.

[20]  J. Hoogstraten,et al.  Characteristics of 5410 edentulous implant candidates and the treatment they receive. , 1995, Community dentistry and oral epidemiology.

[21]  R. H. Batenburg,et al.  Mandibular overdentures supported by two Brånemark, IMZ or ITI implants. A prospective comparative preliminary study: one-year results. , 1998, Clinical oral implants research.

[22]  Angelo A Caputo,et al.  Photoelastic analysis of the effect of palatal support on various implant-supported overdenture designs. , 2004, The Journal of prosthetic dentistry.

[23]  Y. Solomons,et al.  The prosthodontic maintenance requirements of mandibular mucosa- and implant-supported overdentures: a review of the literature. , 2000, The International journal of prosthodontics.

[24]  C. Watson,et al.  Implant complications and failures: the complete overdenture. , 2001, Dental update.

[25]  M. C. Lee,et al.  Effects of posts on dentin stress distribution in pulpless teeth. , 1992, The Journal of prosthetic dentistry.

[26]  Y. Solomons,et al.  Mandibular implant-supported overdentures: a prospective evaluation of the burden of prosthodontic maintenance with 3 different attachment systems. , 2000, The International journal of prosthodontics.

[27]  G Preti,et al.  Mandibular implant-retained overdenture: finite element analysis of two anchorage systems. , 1998, The International journal of oral & maxillofacial implants.

[28]  T D Taylor,et al.  The McGill consensus statement on overdentures. Mandibular two-implant overdentures as first choice standard of care for edentulous patients. , 2002, Gerodontology.

[29]  H. Chun,et al.  Stress distributions in maxillary bone surrounding overdenture implants with different overdenture attachments. , 2005, Journal of oral rehabilitation.

[30]  J. Brunski,et al.  Comparison of load distribution for implant overdenture attachments. , 2002, The International journal of oral & maxillofacial implants.

[31]  G. Liu,et al.  Application of finite element analysis in implant dentistry: a review of the literature. , 2001, The Journal of prosthetic dentistry.

[32]  J. Walton,et al.  A clinical trial of patient satisfaction and prosthodontic needs with ball and bar attachments for implant-retained complete overdentures: three-year results. , 2005 .

[33]  G. van der Perre,et al.  Finite element analysis of non-axial versus axial loading of oral implants in the mandible of the dog. , 1998, Journal of oral rehabilitation.

[34]  D. Wismeijer,et al.  Patient satisfaction with implant-supported mandibular overdentures. A comparison of three treatment strategies with ITI-dental implants. , 1997, International Journal of Oral & Maxillofacial Surgery.

[35]  R. Mericske-Stern.  Three-dimensional force measurements with mandibular overdentures connected to implants by ball-shaped retentive anchors. A clinical study. , 1998, The International journal of oral & maxillofacial implants.

[36]  Robert L Engelmeier,et al.  Effect of abutment angulation on the strain on the bone around an implant in the anterior maxilla: a finite element study. , 2007, The Journal of prosthetic dentistry.

[37]  R. H. Batenburg,et al.  Mandibular overdentures supported by two or four endosseous implants. A 5-year prospective study. , 2004, Clinical oral implants research.

[38]  A Vissink,et al.  Treatment concept for mandibular overdentures supported by endosseous implants: a literature review. , 1998, The International journal of oral & maxillofacial implants.

[39]  R. H. Batenburg,et al.  Mandibular overdentures supported by two or four endosteal implants. A prospective, comparative study. , 1998, International journal of oral and maxillofacial surgery.

[40]  R. Mericske-Stern.  Clinical evaluation of overdenture restorations supported by osseointegrated titanium implants: a retrospective study. , 1990, The International journal of oral & maxillofacial implants.

[41]  W. Yin,et al.  [Energy relieving effect of different thickness of mucosa beneath mandibular complete denture]. , 2004, Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology.

[42]  M. Piotti,et al.  3-D in vivo force measurements on mandibular implants supporting overdentures. A comparative study. , 1996, Clinical oral implants research.

[43]  J. O. Rogers,et al.  The extent of maintenance required by implant-retained mandibular overdentures: a 3-year report. , 1996, The International journal of oral & maxillofacial implants.

[44]  Chao Yl,et al.  The incomprehensible success of the implant stabilised overdenture in the edentulous mandible: a literature review on transfer of chewing forces to bone surrounding implants. , 1995 .

[45]  Davis Dm,et al.  The extent of maintenance required by implant-retained mandibular overdentures: a 3-year report. , 1996 .

[46]  N. Wakabayashi,et al.  Stress analysis in edentulous mandibular bone supporting implant-retained 1-piece or multiple superstructures. , 2005, The International journal of oral & maxillofacial implants.

[47]  S. Minakuchi,et al.  Finite element analysis of stress-breaking attachments on maxillary implant-retained overdentures. , 2007, The International journal of prosthodontics.