CLINICAL EVALUATION OF COMPLICATIONS FOLLOWING PLACEMENT OF DENTAL IMPLANTS. Clinical Paper & Comparative Studies
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1 CLINICAL EVALUATION OF COMPLICATIONS FOLLOWING PLACEMENT OF DENTAL IMPLANTS University Journal of Dental Sciences Peeyush Sharma, Sunil Sharma, Bindu Bharadwaj, Punit Chitlangia, Ruchika Tiwari, Amit Bhamboo Postgraduate Student, Professor and Head, Professor, 4,5 6 Reader, Senior Lecturer ABSTRACT: Aims & objectives: This study was done to identify the types, frequencies, and risk factors associated with complications following placement of dental implants. It was arbitrary accepted that one or more factors could be identified that are associated with an increased risk for complications and may be modified to enhance outcome. Materials and Methods: A retrospective cohort study was done that included patients who received Dental implants between October 2014 and September Predictor variables were grouped into demographic, medical history, implant-specific, anatomic, prosthetic, and reconstructive categories. Complications were grouped into inflammatory, prosthetic, operative, and major or minor categories. Cox proportional hazards regression models were developed to identify risk factors for complications. Results: The sample was composed of 80 patients. The overall frequency of implant complications was 35 % ( 22.50%, inflammatory, 8.75 % operative and 3.75% prosthetic), of which % were major. The multivariate Cox model revealed that smoking, use of 1-stage implants, reconstructive procedures & placement of Dental implant in maxilla were statistically associated with an increased risk for overall complications. Conclusion: Four risk factors identified in this study, out of which smoking and 1-stage implants, can be modified to some extent. Clinical Paper & Comparative Studies Keywords : Complications, Dental implants, Proportional hazards models, Retrospective cohort study, Risk factors Source of support : Nil Conflict of interest: None INTRODUCTION Complications and failures in dental practice are possible. The mere knowledge of the technique of implant treatment is not sufficient to eliminate all problems. The clinical effectiveness of the osseointegration concept introduced by Brånemark 1 and colleagues in the 1960s has revolutionized the clinical practice of dentistry. Dental implants are now the preferred line of treatment for the replacement of missing teeth. Additionally, implant-supported full-mouth prosthesis are a good treatment option for patients who are completely edentulous, achieving a comprehensive and 2 functional oral rehabilitation. Implant failures are categorized as primary, when the body is unable to establish osseointegration, or secondary, when the body is unable to maintain the achieved 3 osseointegration and a breakdown process results. The process of osseointegration between the host's bone tissue and the implant is the key to the success 4 of the implant. Albrektsson and colleagues defined it as a direct structural and functional connection between bone and the surface of a load- 5 bearing implant. Avivi-Arber and Zarb, concluded that extensive long-term implant studies are needed to determine which specific criteria comprise optimal functional and esthetic results with minimum risk of morbidity. Prevention of all surgical complications is impossible; however, many can be minimized with proper planning. University Journal of Dental Sciences, An Official Publication of Aligarh Muslim University, Aligarh. India 54
2 AIMS & OBJECTIVE a.)to study and identify the types and frequencies of complications associated with Dental implants b) To identify risk factors associated with implant complications. MATERIALS AND METHODS In this retrospective cohort study, a total of 80 patients who received dental implant and prosthesis at Mahatma Gandhi dental college & hospital, between march 2012 & September 2014 in Department of oral and Maxillofacial surgery, Department of Prosthodontics and Crown & Bridge & Department of Periodontology & Implantology were included. Minimum follow up was done for 6 months. Patients were selected irrespective of sex, cast and socio-economic status. Criteria for patient selection Inclusion Criteria: 1. Patients aged between years. 2. Patients with missing teeth indicated for Dental implants Exclusion Criteria: 1. An active infection or a history of persistent infections. 2. Medically compromised patients. 3. Any relative or absolute contraindications of the placement of Dental implants. METHOD OF COLLECTION OF DATA Study Variables Predictor Variables. The predictor variables, i.e., exposures or risk factors for complications, as outlined below. 1. Demographic Variables. These variables included gender and age at the time of implant placement. 2. Health Status Variables. Patient health status defined according to the American Society of Anesthesiology (ASA) system from level I to level V. ASA I is defined as a normal healthy patient, while ASA V is defined as a moribund patient. Also the presence of condition, specifically diabetes, liver disease, or immunosuppressant, associated with poor wound healing. Tobacco use at the time of implant placement was recorded. 3. Anatomic Variables. These variables includes implant location, whether maxilla or mandible, anterior or posterior. 4. Implant Variables. Staging (1 or 2stage placement). Stage 1-Implant with per mucosal healing, no uncover surgery. Stage 2 -Healing submerged, then uncover surgery. 5. Prosthetic Variables. Prosthetic variables were grouped into 2 categories: removable (overdenture) or fixed (crown or fixed partial prosthesis). 6. Reconstructive Variables. The use of a reconstructive procedure was documented in the patient's record if the recipient site enhanced with at least one of the following procedures: barrier membrane, internal sinus lift, lateral sinus lift, ridge splitting procedure, onlay graft, inlay graft, or bone grafting (autologous or synthetic). Specifically noted is whether the reconstructive procedures and implant surgeries were carried out simultaneously or separately. 7. Survival Analysis. The following information was recorded: dates of implant, abutment, and restoration placement; and date of the first complication (when applicable). Outcome Variables The primary outcome variable was the presence or absence of a complication following implant placement. The date of the first implant complication was documented and then the complication was being categorized into 1 of 3 groups: inflammatory, operative, or prosthetic. Inflammatory complications include the following conditions: 1. Implant mobility, as evidenced in record. 2. Pain: Patient's complaint of pain at least 7 days after implant surgery required dispensation of additional pain medication or additional follow-up appointments. 3. Infection, defined as the presence of purulent exudates, fistula, cellulitis, sinusitis. University Journal of Dental Sciences, An Official Publication of Aligarh Muslim University, Aligarh. India 55
3 4. Peri-implantitis, defined as the clinical evidence of exposure of threads, bleeding on probing & radiographic evidence of progressive peri-implant bone loss or radiolucency associated with the implant. 5. Impaired wound healing, as evidenced by soft tissue breakdown occurring 21 days or more after implant surgery, exposed bone, graft material, or the implant. 6. Gingival recession required free gingival graft procedure. Inflammatory Complications were further categorized as major or minor. A major complication was defined as a complication that resulted in implant failure. A minor complication was defined as a complication not associated with implant loss. Prosthetic Complications 1. Abutment fracture or loosening. 2. Need for occlusal or prosthetic adjustment more than 2 weeks after definitive restoration. 3. Need for recementation of loose fixed prosthesis within 2 weeks of delivery. Operative Complications 1. Inadvertent placement of an implant into the sinus or the submandibular space. 2. Paresthesia, defined as the patient's subjective complaint of numbness/ tingling lasting at least 7 days after implant surgery. 3. Buccal wall fenestration. Data Analysis Complication frequencies and descriptive statistics were computed with SPSS ( statistical package for social sciences) Version 18.0 statistical analysis software. Descriptive statistics were computed for all study variables. Cox proportional hazards regression was employed to identify risk factors related to implant complications. Potential risk factors for complications were identified using the bivariate Cox proportional hazards regression model & multivariate Cox proportional hazards model and were considered candidate variables if P <. 05. Variables meeting this criterion were statistically associated (P <.05) with complications. RESULTS A retrospective cohort study was conducted between October 2014 and September 2015, a total of 80 patients who received Dental implants & prosthesis were included in this study. The Minimum follow up was done for 6 months. Because patients commonly had more than 1 implant placed, the issue of correlated observations arises. To produce statistically valid inferences for clinical interpretation, 1 randomly selected implant per patient was chosen for analysis and one type of complication was selected. The results that follow are based on 80 patients and 80 implants. Overall frequency of complications was 35%. The average age was years. The majority of patients were healthy & classified ASA I or II. Tobacco use at the time of implant placement was reported by 12.5% of patients. Equal numbers of implants were placed in maxilla and mandible. Less than 20% of the implants were placed using a 1- stage procedure. 25% of the implant sites were associated with reconstructive procedures. Graph 1. Overall complication rate: 35% (28/80) Major complications: 13.75% (11/80) Minor complications 21.25% (17/80) A)Inflammatory complications (22.5%) a.)peri-implantitis 10% (8/80) b)mobility: 5% (4/80) c)wound healing: 6.25% (5/80) d)pain 1.25% (1/80) e) Infectious process 0 (0%) f)gingival recession 0 (0%) b)intraoperative complications (8.75%) c)prosthetic complications (3.75%) Table 1. Based on the Bivariate analysis, tobacco use (P =0.003), staging ( P = 0.002), Site ( P <0.0225), and the use of reconstructive procedures ( P <0.0001) were associated with an increased risk for complications University Journal of Dental Sciences, An Official Publication of Alaigarh Muslim University, Aligarh. India 56
4 Multivariate Logistic regression Analyses of Potential Factors Associated with Implant Complications Odds Ratios and 95% Confidence Intervals Variable Odds Ratio 95% CI P value Age ( 18 to 45 Vs 45 & above) to Gender (female Vs male) to Implant staging (1- Vs 2-stage) to Reconstructive procedure (yes Vs no) to Tobacco use (smoker Vs non smoker) to Site (Mandible Vs Maxilla) to Position (Posterior Vs Anterior) to Prosthetic type (removable Vs fixed) to Table 2. The multivariate logistic regression analysis was constructed using these patients. For current tobacco use, the odds ratio was (P = ; 95% confidence interval [CI], to ) suggesting that smokers were times more likely to have implant complications than nonsmokers. The odds ratio for implant staging was (P = ; 95% CI, to ), with 1-stage implants having a 3.84 times increased risk for complications. The use of reconstructive procedures was also associated with an increased risk for complications (odds ratio 6.17; P = 0.017; 95% CI, to ).Placement of dental implants in maxilla have times more likely to have implant complication than mandible. (Odds ratio=3.6487; P=0.022, 955 CI, to ). DISCUSSION To date, most clinical implant research has focused on descriptions and factors associated with implant success. Systematic reports of complications and associated risk factors are limited. We sought to address this deficiency by implementing a study with 2 specific aims: (1) to identify the types and frequencies of complications associated with placement of Dental implants, and (2) to identify risk factors associated with implant complications. It was hypothesized that risk factors associated with implant complications could be identified that might be modified by the clinician to enhance patient outcome. 6 A prospective study by Muftu A, et al on 168 patients who received 432 Bicon implants to replace posterior dentition reported a 0.74% frequency of abutment loosening, a 0.5% frequency of abutment fracture, and a 3.71% frequency of crown replacement necessitated by cement failure or porcelain fracture. In this study, the frequency of prosthetic complication was 3.75%.Analyses of prosthetic and operative complications were limited because of the small number of patients who experienced these complications. Regardless, the multivariate Cox model showed that no variables were statistically associated with prosthetic complications. 7 A retrospective cohort study by Nancy E. McDermott et al who received Bicon implants (Bicon, Boston, MA) between 1992 and The overall frequency of implant complications was 13.9% (10.2% inflammatory, 2.7% prosthetic, 1.0% operative).the present study showed, the overall frequency of implant complications occurring after placement of Dental implants was 35% (22.5% inflammatory, 8.75% operative, 3.75% prosthetic). In inflammatory complications maximum complications were peri-implantitis (10%), followed by impaired wound healing (6.25%), mobility (5%) and Pain (1.25%). Endosseous implants developing peri-implantitis (clinical suppuration or bone loss radiographically) that are still immobile should be attended too quickly to prevent their failure. Minimal bone loss and probing depths of less than 4 mm usually require plaque and calculus removal, polishing of the implant crown, and increased oral hygiene visits annually. Mild bone loss and probing depths of 4 to 6 mm require, in addition to increased hygiene visits, chlorhexidine rinses daily or the application of chlorhexidine gels to the affected area. Applying citric acid directly to the exposed implant threads can be considered to detoxify the area. Once any suppuration, oedema, and/or infection has resolved, it is reasonable to consider guided tissue regenerative procedures with allogenic bone grafting to restore bone height around the implant. If the implant is restored, the restoration should be taken out of occlusion to minimize functional loads. Mobility of implants results in implant failure, and removal is required 8 with possible bone grafting if desired. In our study Impaired wound healing occurred in 5 patients (6.25%) which was in form of Soft tissue breakdown occurring within 21 days or more after implant surgery, exposing bone, graft material, or the implant. Incision line dehiscence usually occurs as a result of lack of a tension-free closure or sharp edges of the graft perforating the overlying soft tissue. Considerations prior to grafting include evaluating the soft tissue envelope of recipient area, University Journal of Dental Sciences, An Official Publication of Aligarh Muslim University, Aligarh. India 57
5 specifically considering the quality and amount of keratinized mucosa, tissue thickness, and presence of scar tissue. It is important to remember that bone grafting increases volume of underlying bone in the grafted site; evaluating the soft tissue prior to grafting is essential to ensure that the recipient site soft tissue can accommodate the bone graft in a tension-free fashion. Ideally, most incisions should be placed on the crest of the alveolar ridge, as this allows for maximal blood supply to the flap. Flaps placed too buccal, palatal, or lingual may have decreased vascular supply, risking necrosis of the flap. Another issue to consider is that by extending existing tissue to cover graft sites, there may be resulting obliteration of the associated vestibule; as such, patients should be made aware of need for a secondary vestibuloplasty as needed. Small pinpoint dehiscence's can often be easily managed by local wound care (warm salt water rinses and good hygiene). Larger dehiscence may require non alcohol-based rinses (alcohol based rinses can be toxic to non vascularised bone grafts), local wound care, oral antibiotics to minimize infection risk, and/or debulking of the graft to allow for 8 primary closure. Necrotic graft material should be debrided. Dentoalveolar reconstructive procedures (DRPs) are commonly used to enhance implant recipient sites that have insufficient bone to accommodate an implant. Many patients also underwent some form of grafting to enhance the recipient site, and the addition of more procedures contributes to an increased likelihood of complications. 9 A retrospective cohort study design by Valerie V. Woo et in which the main predictor variable was the use of DRPs, such as external or internal sinus lifts, onlay bone grafting, or guided-tissue regeneration with autogenous bone grafts or autogenous bone graft substitutes, to enhance the recipient sites before implant insertion. In the multivariate model, patients with DRPs did not have a statistically significant increased risk for implant failure (odds ratio =1.4, P = 0.3). The present study showed that use of reconstructive procedure for Dental implant placement was statically significant & associated with Implant complication. The multivariate statistics showed that implant complications were significantly related to reconstructive procedure (odds ratio 6.17, P= 0.017). In present study complication rate was 52.5% in maxilla and 17.50% in mandible. It might be due to the reason that cortical thickness and density of the mandibular bone are higher than those of the maxillary bone. A similar study was conducted by 10 William martin et al where they showed that implant success rates are higher for mandibular implants, and failure rates are higher in the posterior regions of the jaws. Type 3 or 4 bone quality in the jawbone is associated with high implant failure rates. In a10-year longitudinal study found that patients who smoked and had poor oral hygiene exhibited significantly (P<.001) more marginal bone loss than did patients who did 11 not smoke. The present study showed that out of 80 patients, 10 patients were smokers and complication was noted in 6 patients (odds ratio ; (P=.0477). This indicates that they have statically significant increased risk for implant complications. Smoking is a common contributor to decreased tissue oxygenation.carbon monoxide, oxidating radicals, nitrosamines and nicotine are released during smoking. Nicotine causes a systemic increase in epinephrine, nonepinephrine and carboxyhemoglobin and also decreases blood flow, collagen deposition, prostacyclin formation; it increases platelet aggregation, causes polymorphonuclear neutrophil dysfunction and increases fibrinogen, haemoglobin and blood viscosity all of which negatively affect wound healing. It has been concluded that long term smoking results in poor bone quality and a poorer prognosis 12 for implants. 13 Baelum V et al have done studies which showed that the risk of implant failure is lower with the submerged technique (2- stage) than with the non submerged technique. This is in accordance with our study where total of 80 dental implant placed,out of which 69 were stage 2 & 11 were stage 1.Complications are more in stage 1 as compared to stage 2. Multivariate Cox proportional hazards regression model shows (Odds ratio= P=0.0321). It means that in comparison to 2-stage procedures, 1-stage procedures have times increased risk for implant complications. The reason for the higher success rate with the submerged implant technique could be because of the minimal risk of bacterial infection. In terms of overall complications, the multivariate Cox proportional hazards regression model indicated that smoking at the time of implant placement, use of reconstructive procedures, 1-stage implants and dental implant placement in University Journal of Dental Sciences, An Official Publication of Alaigarh Muslim University, Aligarh. India 58
6 maxilla were statistically associated with an increased risk for overall implant complications. Inflammatory complications composed 22.50% of the complications, followed by operative and prosthetic complications, 8.75% and 3.75%, respectively. The frequency of inflammatory complications were Periimplantitis 10%), impaired wound healing (6.25%) mobility (5%), Pain 1.25%. Bivariate analysis revealed that current tobacco use (P = 0.003), staging (P = 0.139), and use of reconstructive procedures (P <0.001) were potential risk factors for inflammatory complications. The multivariate model showed for current tobacco use, the Odds ratio was (P =.0477; 95% CI, to ). The Odds ratio for implant staging was (P = ; 95% CI,.5656 to ), with single-stage implant placement associated with an increased risk for inflammatory complications. The use of reconstructive procedures also increased the likelihood of inflammatory complications (Odds ratio 6.17; P = 0.017; 95% CI,.0000 to.0000).this is in accordance with study conducted by Nancy E. McDermott et 7 al,they shown the specific types and frequency of complications. Inflammatory complications (10.2%), prosthetic 2.7%, operative 1% included mobility (4.0%), infection (2.4%), pain (1.6%), peri-implantitis (1.0%), delayed wound healing (0.73%), and gingival recession (0.44%). Slightly over half (52.1%) of the inflammatory complications were major. Based on the bivariate analysis, tobacco use (P =.01), staging (P =.003), prosthesis type (P =.03), and the use of reconstructive procedures (P =.024) were associated with an increased risk for complications. The multivariate model was constructed using these candidate variables as well as age and gender. For current tobacco use, the adjusted hazard ratio was 2.31 (P =.0051; 95% confidence interval [CI], 1.29 to 4.16) suggesting that smokers are 2.31 times more likely to have implant complications than non smokers. The adjusted hazard ratio for implant staging was 2.56 (P =.0013; 95% CI, 1.45 to 4.55), with 1-stage implants having an increased risk for complications. The use of reconstructive procedures was also associated with an increased risk for complications (adjusted hazard ratio 1.18; P =.017; 95% CI, 1.03 to 1.34). Prior reports have associated smoking, poor oral hygiene, surgical inexperience, lack of attached mucosa, and loose abutment screws with inflammatory complications. 14 In a Matched case- control analysis by Rami Alissa et al, they found that, there was no statistically significant difference among patients was observed for age. This is in accordance with our study where (P= ) which showed no statistically significant difference in implant complication between patients <45 years & >45 years & above. In our study pain was present in 1 case (1.25%) which 15 resolved after a week. Heller et al advocated the practice of using infiltration for local anaesthesia instead of an IAN block, because without complete lack of sensation, the patient will feel pain if the drill approaches the IAN canal a significant indication to stop drilling. At the same time, an intra-operative radiograph with the presence of the drill or other gauge in the osteotomy site is of great value, especially if nerve approximation is expected. Few risk factors identified in this study, out of which smoking and 1-stage implants, can be modified to some extent. It is believed this knowledge will allow us to decrease complication rates, eg, by offering 2-stage implants or encouraging cessation of smoking prior to implant placement, and to engage the patient in a more informed discussion of treatment options. CONCLUSION The present study demonstrated that complications associated with dental implants occurred with a frequency a 35 % in this study population. The most commonly observed complications were inflammatory 22.50%, followed by operative 8.75 % and prosthetic 3.75% respectively. Most of the implants 21.25% associated with complications did not fail. Multivariate Cox proportional hazards regression identified smoking, 1-stage implants, use of reconstructive procedures and placement of Dental implants in maxilla as risk factors for implant complications.two of these four risk factors, smoking and 1-stage implants, can be modified to enhance outcome.it is suggested that subsequent studies should be attempted to identify additional risk factors which can be modified to minimize morbidity and enhance patient outcome. Investigations examining the influence of smoking and reconstructive procedures on implant complications are recommended. The findings of our study may be used to decrease the incidence of implant-associated complications and to better assist the patient in selecting the most appropriate treatment option. REFRENCES: 1. Branemark PI, Adell R, Breine U, et al. Intra-osseous anchorage of dental prostheses. I. Experimental studies. University Journal of Dental Sciences, An Official Publication of Alaigarh Muslim University, Aligarh. India 59
7 Scand J Plast Reconstr Surg 1969; 3(2): Malo P, Nobre Mde A, Petersson U, et al. A pilot study of complete edentulous rehabilitation with immediate function using a new implant design: case series. Clin Implant Dent Relat Res 2006; 8(4): Heydenrijk K, Meijer HJ, van der Reijden WA, et al. Microbiota around root-form endosseous implants: a review of the literature. Int J Oral Maxillofac Implants 2002;17(6): Albrektsson T, Branemark PI, Hansson HA, et al. Osseointegrated titanium implants. Requirements for ensuring a long-lasting, direct bone-to-implant a n c h o r a g e i n m a n. A c t a O r t h o p S c a n d 1981;52(2): McDermott N, Chuang SK, Woo VV, Dodson TB. Complications of dental implants: identification, frequency, and associated risk factors. Int J Oral Maxillofac Implants Nov-Dec; 18(6): Muftu A, Chapman RJ. Replacing posterior teeth with free standing implants: Four-year prosthodontic results of a prospective study. J Am Dent Assoc 1998; 129: McDermott NE, Chuang SK, Woo VV, Dodson TB. Complications of dental implants: identification, frequency, and associated risk factors. Int J Oral Maxillofac Implants Nov-Dec;18(6): Aziz, S. R. (2015). Hard and Soft Tissue Surgical Complications in Dental Implantology. Oral and Maxillofacial Surgery Clinics of North America, 27(2), doi: /j.coms Woo,Valerie V,Sung-Kiang Chuang, Shadi Daher,Ali Muftu, and Thomas B Dodson. Dentoalveolar Reconstructive Procedures as a Risk factor for Implant failure. Journal of Oral and Maxillofacial Surgery: Martin W, Lewis E, Nicol A. Local risk factors for implant therapy. Int J Oral Maxillofac Implants. 2009;24 Suppl: Lindquist LW, Carlsson GE, Jemt T. Association between marginal bone loss around osseointegrated mandibular implants and smoking habits: a 10-year follow-up study. J Dent Res 1997;76(10): Moy PK, Medina D, Shetty V, et al. Dental implant failure rates and associated risk factors. Int J Oral Maxillofac Implants 2005;20(4): Baelum V, Ellegaard B. Implant survival in periodontally compromised patients. J Periodontol 2004;75(10): Alissa, Rami, and Richard J. Oliver. "Influence of Prognostic Risk Indicators on Osseointegrated Dental Implant Failure: A Matched Case-Control Analysis." Journal of Oral Implantology: Heller AA, Shankland WE 2nd. Alternative to the inferior alveolar nerve block anesthesia when placing mandibular dental implants posterior to the mental foramen. J Oral Implantol. 2001;27: CORRESPONDENCE AUTHOR : Dr. Peeyush Sharma Rawal Hospital, Ajmer Road, Bhankrota, Jaipur, Rajasthan. Peeyushsharma3@gmail.com University Journal of Dental Sciences, An Official Publication of Alaigarh Muslim University, Aligarh. India 60
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