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Fixed Partial Denture Failures: a Clinical Survey for Evaluation of the Factors Responsible 1Manjula B Chandranaik, 2Roopa K Thippanna

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Fixed Partial Denture Failures: a Clinical Survey for Evaluation of the Factors Responsible 1Manjula B Chandranaik, 2Roopa K Thippanna CODSJOD 10.5005/jp-journals-10063-0031 ORIGINAL ARTICLE Fixed Partial Denture Failures: A Clinical Survey for Evaluation of the Factors Responsible 1Manjula B Chandranaik, 2Roopa K Thippanna ABSTRACT Source of support: Nil Aim: Most of the time, the failures are conditions that occur Conflict of interest: None during or after appropriately performed fixed prosthodontics treatment procedures. Reasons for failures in fixed prostho- dontics can be divided into biological, mechanical and esthetic INTRODUCTION factors. Replacement of missing teeth in partially edentulous The present study was conducted to assess biological, arch involves various treatment options like removable, mechanical, and esthetic failure factors among fixed partial fixed prosthesis, and implants. Fixed prosthodontic treat- dentures (FPDs). ment can offer exceptional satisfaction for both patient Materials and methods: A cross-sectional study was con- and dentist. ducted among patients who reported to the Department of Prosthodontics, College of Dental Sciences, Davangere, Restoring and replacing of teeth with FPDs represents Karnataka, India with complaints about fixed partial denture. an important treatment procedure in dental practice, A total of 450 fixed partial denture failures in subjects were mainly because of the continuing high prevalence of assessed. The fixed partial denture was examined for the caries and periodontal diseases in the adult and geriatric failure factors (biological, mechanical, and esthetic). The populations.1 selected subjects underwent a clinical examination and set of Failure to achieve the desired specifications of design a questionnaire about the complaint of the fixed partial denture and further detail clinical examination about the failure factor. for function and esthetics would fail the prosthesis. Most of the time, the failures are conditions that occur during or Results: Out of 450 fixed partial denture failures, 33.3% of it showed the biological failure, 55.1% showed the mechanical after performed fixed prosthodontics treatment procedures. failure and 11.5% showed esthetic failure. The most frequent Failure of the fixed prosthesis can occur in many reason for failure was mechanical factors followed by biological ways. The reasons for failure may be divided into bio- and esthetic failure factors. logical failures, mechanical failures, and esthetic failures. Conclusion: The caries was the most common biological Mechanical failures are more directly under the influ- failure factor, the loss of retention was the most common ence of the clinician. Biological problems are less easily cause of mechanical failure factor and the unacceptable color match was accounted more when compared to other esthetic controlled and in some instances may be unrelated to the failure factors. treatment or prosthesis.2 Clinical significance:By knowing the type of failures, we can Reasons of failure can be caries, uncemented resto- plan a proper treatment plan so that the abutment will have a ration, over-contoured restoration, poor occlusal plane, long time prognosis. periodontal disease, periapical involvement, failed post Keywords: Biological failure, Esthetic failure, Fixed partial retained crowns, poor esthetics, crown perforation and denture failure, Mechanical failure. defective margins of restorations.1,2 How to cite this article: Chandranaik MB, Thippanna RK. Fixed Knowledge regarding the clinical complications that Partial Denture Failures: A Clinical Survey for Evaluation of the can occur in fixed prosthodontics enhances the clinician’s Factors Responsible. CODS J Dent 2017;9(2):41-45. ability to complete a thorough diagnosis and to develop the most appropriate treatment plan.3 It provides realistic expectations to patients and to plan the time intervals 1Senior Resident, 2Professor needed for post-treatment care.4 1Department of Dental, SSIMS and RC, Davangere, Hence, the present study intended to assess biologi- Karnataka, India cal, mechanical, and esthetic failure factors among FPDs. 2Department of Prosthodontics, CODS, Davangere, Karnataka, India MATERIALS AND METHODS Cooresponding Author: Roopa K Thippanna, Professor, A cross-sectional study was conducted among the Department of Prosthodontics, CODS, Davangere, Karnataka, India, e-mail: [email protected] patients complaining about FPD. The subjects were selected from the Department of Prosthodontics, College COD Journal of Dentistry, July-December 2017;9(2):41-45 41 Manjula B Chandranaik, Roopa K Thippanna of Dental Sciences, Davangere, Karnataka, India. The present then suggestive of occlusal interference or were study protocol was reviewed and approved by the Insti- evaluated by the 100 micron thickness of articulating tutional Review Board of College of Dental Sciences, paper in between the teeth. Davangere, Karnataka, India. A total of 450 FPD failures Mechanical failure factors like loss of retention, dis- in subjects who were fulfilling the inclusion criteria of lodgement of crown or bridge, (Fig. 2), fracture of bridge the study were selected. The subjects were requested or connector failure, coronal tooth fracture, occlusal to fill in the consent form and participate in the study. wear of prosthesis or perforation of the prosthesis and The subjects were evaluated for biological, esthetic and porcelain fracture were examined. mechanical factors. Questionnaire and clinical examina- Esthetic failure factors (Fig. 3) like unacceptable color tion were performed personally for each subject. match evaluated by comparing with the adjacent teeth Every subject was asked to sit in the dental chair in an or by the patient complaint, over/under the contoured upright position. All the examinations were carried out margin of restoration, inadequate marginal fit were by the single operator, standing in front of the subjects. examined. The data collected were then subjected to Clinical oral examination was done under good illumi- statistical analysis. nation using sterile diagnostic instruments. Intraoral examination proceeded in the area of complaint, the RESULTS type of material made of and the type of pontic design Table 1 shows the frequency distribution of failure factors to evaluate the failure factors, i.e., biological, mechanical of the FPD. Out of 450 FPD failures, 33.3% of it showed the and esthetic. biological failure. 55.1% showed mechanical failure, and Biological failure factors like caries (Fig. 1), tender 11.5% showed esthetic failure. The mechanical failures on percussion, food lodgement, periapical pathology, were more compared to biological and esthetic failures. mobility in abutment, occlusal problem. Caries can be Table 2 shows the frequency distribution of biological detected by comprehensive probing of the margins of failure factors. Out of 150 biological failure, 30.7% because the prosthesis and tooth surfaces with explorer or use of dental floss interproximally the floss thread will get shredded and also the intraoral periapical radiographs to view interproximal caries. Tapping of the abutment with the probe/mirror end at occlusally or incisally to rule out periapical pathology. If percussion did buccally or lingually to rule out periodontal involvement. Palpa- tion of the gum carried out to rule out sinus opening or pus discharge or pain adjacent to the abutment to rule out periapical pathology. Mobility was examined by applying pressure with the ends of two mirrors in buccolingual direction. Interfering centric and eccentric occlusal problems were ruled out by fremitus test, that is by placing the tip of the index finger on the facial surface of the tooth and asked the patient to tap-tap if vibration Fig. 2: Mechanical failure as loss of retention Fig. 1: Biological failure as interproximal caries Fig. 3: Esthetic failure as unacceptable color match and under contoured margin 42 CODSJOD Fixed Partial Denture Failures: A Clinical Survey for Evaluation of the Factors Responsible Table 1: Frequency distribution of failure factors of fixed partial Table 2: Frequency distribution of biological failure factors denture Factors Frequency Percentage Factors Frequency Percentage Caries 46 30.7 Biological 150 33.3 Tender on percussion 28 18.6 Mechanical 248 55.1 Periapical pathology 36 24 Esthetic 52 11.5 Tenderness on bite 8 5.3 Total 450 100 Mobility of abutment 12 8 Occlusal problem 8 5.3 Table.3: Frequency distribution of mechanical failure factor Food lodgement 8 5.3 Factors Frequency Percentage Sinus opening 4 2.7 Loss of retention 164 66.1 Total 150 100.0 Fracture of bridge 8 3.22 Coronal tooth fracture 4 1.61 Table.4: Frequency distribution of esthetic failure factors Porcelain fracture 32 12.9 Esthetic Frequency Percentage Occlusal wear 8 3.22 Unacceptable color match 28 53.8 Perforation 8 3.22 Overcontoured margin 4 7.69 Loss of retention due to 12 4.83 Undercontoured margin 20 38.46 fracture Total 52 100 Loss of retention due to 8 3.22 porcelain fracture Loss of retention due to 4 1.61 various treatment modalities like removable prosthesis, perforation implantology, and conventional bridge prosthesis are Total 248 100 possible. If the cost factor precludes the placement of implants, then conventional bridges are still a favorable of caries,18.6% showed tender on percussion, 24% showed treatment option as they provide a psychological and periapical pathology, 5.3% showed tenderness on the social benefit of wearing a fixed rather than removable bite, 8% showed abutment mobility, 5.3% of the occlusal prosthesis.5-7 problem, 5.3% food lodgements and 2.7%
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