CHAPTER 1. General Introduction
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1 CHAPTER 1 General Introduction
2 Chapter 1 The loss of remaining natural teeth and provision of artificial removable dentition is a major and irreversible procedure for the patient. The main limitations of artificial dentition in the form of conventional dentures are related to the poor retention and comfort of the mandibular denture and patients inability to eat properly. Completely edentulous patients experience a considerable improvement when their conventional mandibular dentures are retained with endosseous dental implants. 1-4 This therapeutic approach has been developed to such a degree that it is now considered the standard care of treatment for patients who complain of persistent looseness of their mandibular complete dentures. Specifically, mandibular overdentures supported by two implants placed in the interforaminal region are regarded as an acceptable and predictable treatment modality. 5 This conventional 2-stage protocol is associated with a healing period of 3-6 months prior to functional loading. 6 Subsequent research investigated, however, whether this prolonged healing period was an absolute prerequisite and whether it could be shortened without compromising osseointegration. 7 As a result, a shortened period between implant placement and prosthesis insertion was introduced to reduce treatment time. 8 The terms early and immediate loading were presented to define these shortened healing periods after implant placement. Immediate loading of dental implants has been defined as loading within one week subsequent to implant placement. 9 Several clinical investigations reported high survival rates for endosseous dental implants placed in the edentulous mandible and loaded immediately after placement. 10,11 The ITI Conference Consensus stated that the literature supports immediate loading of microrough implants with mandibular overdentures. 12 The proposed advantages of the immediate loading protocol are that it shortens treatment time, gives patients immediate functional benefits, reduces the number and length of office visits, and necessitates fewer provisional restorations. However, these advantages must be weighed against the risks of multiple simultaneous surgical and restorative procedures. Initially, the use of four splinted implants in the interforaminal region was considered mandatory to achieve long-term favorable results. 13 Nowadays, immediate loading of two implants to retain implant overdentures (IODs) is considered an acceptable treatment modality However, a limitation of immediate loading treatment protocols is the diameter of the implants. In cases where the residual bone width is limited, patients need to undergo a bone augmentation procedure or extensive alveoloplasty before standard-sized implants can be inserted. As a rule, an implant of nearly 4 mm in diameter requires at least 6 mm of bone in a facial-lingual dimension for placement without grafting additional bone to augment the site. 17 An alternative to standard-sized implants in the edentulous mandible is the use of Mini Dental Implants (MDIs). They are manufactured as one piece and include an abutment designed for support and/or retention of a provisional or definitive prosthesis. 18 This simplifies the restorative phase, resulting in reduced costs for the patient. The narrow 10
3 General Introduction diameter of the MDIs often allows a simplified insertion technique, involving placement without raising a flap. Although the MDIs have a reduced surface area compared with standard-sized implants, histology in miniature swine has indicated that MDIs are capable of achieving significant osseointegration after three months. The histomorphometric evaluation showed bone integration in all implants at three months (average bone-toimplant contact of 82%). 19 Initially, the MDIs were used for temporary prosthetic stabilization during the healing phase of standard-sized implants. Their success, however, has expanded their use Subsequently, they have been used for long-term fixed and removable prosthetics. 23 Further clinical research has indicated that IODs retained by MDIs might have the potential to become a successful alternative to the current standard implant treatment in the edentulous mandible (two-implant overdenture). One important parameter that determines long-term clinical success is the amount of marginal bone loss (MBL) around the implants. Changes that are beyond the normal limits can result in loss of bone anchorage of the implants. Clinical and radiographic outcomes of immediately loaded MDIs used for long-term stabilization of IODs as an alternative to standard-sized implants have already been published. For example, in a prospective study by Elsyad et al it has b e e n shown that the peri-implant soft and hard tissue responses of immediately loaded MDIs supporting mandibular overdentures were favorable after three years of function. The vertical MBL reported in the aforementioned study was ± 0.64 mm 36 months after loading, and it was comparable to that experienced with standard-sized implants. 24 The survival rates of MDIs reported in the literature are also comparable to those of immediately loaded standard-sized implants. A retrospective study of up to five years showed a high survival rate of the MDIs used to retain mandibular overdentures As any other type of oral rehabilitation, the provision of implant-retained overdentures requires a regular and ongoing maintenance program to ensure long-term clinical success. Relining of a mandibular implant overdenture might occur more often in cases of immediately loaded MDIs because of the secondary healing of the soft tissue around the implants. Other prosthodontic complications may include wear of the O-ring attachments, detachment of the metal housing, fracture of the mandibular overdenture and relining of the maxillary denture. This treatment modality therefore, may require a considerable amount of prosthetic maintenance and repair over time. Although studies report on prosthodontic complications, it is difficult to make definitive conclusions since there is a lack of criteria related to a successful prosthodontic outcome. Besides clinical findings, patients perception on how implant treatment contributes to their quality of life and overall satisfaction is also relevant. Griffitts et al reported that patients experienced a great improvement five months post-operatively with regard to retention of the prosthesis, chewing ability, and comfort
4 Chapter 1 Summarizing, there is sufficient evidence to suggest that MDIs have the potential to be an adequate, simplified and cost-effective alternative for denture stabilization in the edentulous mandible. There is, however, a lack of randomized controlled clinical trials that compare MDIs with standard-sized implants used to retain mandibular overdentures. OUTLINE OF THE THESIS In this thesis we evaluated whether a relatively new treatment modality, the rehabilitation of the edentulous mandible with IODs retained by four MDIs, could be an alternative to the existing therapeutic approaches. The first step (chapter 2) was to conduct a systematic review to evaluate whether there is a combination of number and diameter of implants and attachment system that provides the best clinical outcome in immediately loaded implants used to retain mandibular overdentures, opposed by a maxillary complete denture. For this purpose, a comprehensive search strategy was implemented with specific inclusion and exclusion criteria to identify related studies. The results of this review warranted a prospective study comparing standard-sized implants and MDIs to further assess the clinical performance of MDIs. Thus, the next step involved a pilot study (chapter 3) in which we investigated the radiographic marginal bone level changes and patients satisfaction and quality of life levels of a treatment concept with four immediately loaded (the same day) MDIs, which were used to retain an IOD in edentulous patients. Based on the positive outcomes of the pilot study, a 1-year randomized trial was designed to assess and compare several aspects of rehabilitating the edentulous mandible with IODs retained by MDIs with an existing, documented treatment concept (chapter 4 and 5). The conclusions would help to determine whether it could be a successful alternative treatment modality for the edentulous mandible. The primary outcome was the marginal bone loss around the inserted implants. Secondary outcomes included the peri-implant soft tissue response and the aftercare needed (chapter 4). In addition to the clinical findings, patient-based outcomes were evaluated (chapter 5). In order to achieve this, general satisfaction ratings on a visual analog scale (VAS) as well as a denture-specific short version of the Oral Health Impact Profile (OHIP-20) questionnaire were used. Regardless of the treatment protocol that is followed in order to convert a mandibular conventional denture to an implant overdenture, a thorough assessment prior to implant placement is of paramount importance. The radiographic evaluation as part of the initial examination can contribute to the selection of the most appropriate size of the inserted implants but can also significantly minimize the risk of complications during placement of 12
5 General Introduction the implants. Various imaging techniques, such as panoramic radiographs and cone beam computed tomography (CBCT) can aid treatment planning in the edentulous mandible. Many clinicians limit themselves to the use of panoramic radiographs for the preoperative planning of implants, despite the inherent limitations of this technique. The use of CBCT might provide additional important information which can be used to minimize the risk of surgical complications. The decision, however, to proceed to cross-sectional imaging is not always straightforward, and should be based on clearly identified needs and the clinical and surgical requirements of the clinician. We considered it therefore clinically relevant to evaluate the diagnostic value of cross-sectional imaging as part of the treatment planning prior to fabricating mandibular overdentures that are retained by two implants placed in the interforaminal region (chapter 6). 1 Finally, in chapter 7 the main conclusions of the thesis are discussed, presenting the most important findings and attempting to outline the difficulties of carrying out this clinical study as well as to address its limitations. 13
6 Chapter 1 REFERENCES 1. Wismeijer D, Vermeeren JI, van Waas MA. Patient satisfaction with overdentures supported by one-stage TPS implants. Int J Oral Maxillofac Implants 1992;7: Wismeijer D, van Waas MA, Kalk W. Factors to consider in selecting an occlusal concept for patients with implants in the edentulous mandible. J Prosthet Dent 1995;74: Wismeyer D, van Waas MA, Vermeeren JI. Overdentures supported by ITI implants: a 6.5-year evaluation of patient satisfaction and prosthetic aftercare. Int J Oral Maxillofac Implants 1995;10: Wismeijer D, Van Waas MA, Vermeeren JI, Mulder J, Kalk W. Patient satisfaction with implant-supported mandibular overdentures. A comparison of three treatment strategies with ITI-dental implants. Int J Oral Maxillofac Surg 1997;26: Thomason JM, Kelly SA, Bendkowski A, Ellis JS. Two implant retained overdentures-a review of the literature supporting the McGill and York consensus statements. J Dent 2012;40: Brånemark PI, Engstrand P, Ohrnell LO, Gröndahl K, Nilsson P, Hagberg K, Darle C, Lekholm U. Branemark Novum: a new treatment concept for rehabilitation of the edentulous mandible. Preliminary results from a prospective clinical follow-up study. Clin Implant Dent Relat Res 1999;1: Chiapasco M. Early and immediate restoration and loading of implants in completely edentulous patients. Int J Oral Maxillofac Implants 2004;19(supp): Ledermann PD, Schenk RK, Buser D. Long-lasting osseointegration of immediately loaded, bar-connected TPS screws after 12 years of function: a histologic case report of a 95-year-old patient. Int J Periodontics Restorative Dent 1998;18: Esposito M, Grusovin MG, Maghaireh H, Worthington HV. Interventions for replacing missing teeth: different times for loading dental implants. Cochrane Database Syst Rev 2013;3:CD Chiapasco M, Abati S, Romeo E, Vogel G. Implant-retained mandibular overdentures with Branemark System MKII implants: a prospective comparative study between delayed and immediate loading. Int J Oral Maxillofac Implants 2001;16: Chiapasco M, Gatti C. Implant-retained mandibular overdentures with immediate loading: a 3- to 8-year prospective study on 328 implants. Clin Implant Dent Relat Res 2003; 5: Gallucci GO, Benic GI, Eckert SE, Papaspyridakos P, Schimmel M, Schrott A, Weber HP. Consensus statements and clinical recommendations for implant loading protocols. Int J Oral Maxillofac Implants 2014;29: Rungcharassaeng K, Kan JY. Immediately loaded mandibular implant bar overdenture: a surgical and prosthodontic rationale. Int J Periodontics Restorative Dent 2000;20:
7 General Introduction 14. Attard NJ, David LA, Zarb GA. Immediate loading of implants with mandibular overdentures: one-year clinical results of a prospective study. Int J Prosthodont 2005;18: Ormianer Z, Garg AK, Palti A. Immediate loading of implant overdentures using modified loading protocol. Implant Dent 2006;15: Stricker A, Gutwald R, Schmelzeisen R, Gellrich NG. Immediate loading of 2 interforaminal dental implants supporting an overdenture: clinical and radiographic results after 24 months. Int J Oral Maxillofac Implants 2004;19: Christensen GJ. The mini -implant has arrived. J Am Dent Assoc 2006;137: Bidra AS, Almas K. Mini implants for definitive prosthodontic treatment: a systematic review. J Prosthet Dent 2013;109: Li Y, Lee SS, Zhang W. Aprecio R, Zunt SL. Tissue response to two mini dental implants in miniature swine. J Dent Res 2012;91: Sendax VI. Mini-implants as adjuncts for transitional prostheses. Dent Implantol Update 1996;7: el Attar MS, el Shazly D, Osman S, el Domiati S, Salloum MG. Study of the effect of using mini-transitional implants as temporary abutments in implant overdenture cases. Implant Dent 1999;8: Simon H, Caputo AA. Removal torque of immediately loaded transitional endosseous implants in human subjects. Int J Oral Maxillofac Implants 2002;17: Bulard RA, Vance JB. Multi-clinic evaluation using mini-dental implants for long-term denture stabilization: a preliminary biometric evaluation. Compend Contin Educ Dent 2005;26: Elsyad MA, Gebreel AA, Fouad MM, Elshoukouki AH. The clinical and radiographic outcome of immediately loaded mini implants supporting a mandibular overdenture. A 3-year prospective study. J Oral Rehabil 2011;38: Shatkin TE, Shatkin S, Oppenheimer BD, Oppenheimer AJ. Mini dental implants for longterm fixed and removable prosthetics: a retrospective analysis of 2514 implants placed over a five-year period. Compend Contin Educ Dent 2007;28: Griffitts TM, Collins CP, Collins PC. Mini dental implants: an adjunct for retention, stability, and comfort for the edentulous patient. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2005;100:
CHAPTER 7. General Discussion
CHAPTER 7 General Discussion Chapter 7 A common complaint of edentulous patients wearing conventional dentures is the lack of stability and retention of their mandibular prosthesis. These problems can
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