Tayfun Bilgin

The role of Candida albicans hyphae and Lactobacillus in denture-related stomatitis

Denture-related stomatitis (DRS) is still a dilemma in removable prosthodontics. The aim of this study was to investigate the relationship of DRS with the presence of Candida albicans hyphae and Lactobacillus. A total of 91 patients wearing maxillary and mandibular complete dentures were included in the present study and tested mycologically as well as bacteriologically. A statistically significant association of DRS was found with denture age (p = 0.003) and continuous denture wearing (p = 0.015). Presence of C. albicans hyphae was shown to be significantly higher in DRS cases (p < 0.01), and there was a statistically significant positive correlation between presence of hyphae and C. albicans (p < 0.01). Another interesting finding was that DRS patients showed higher Lactobacillus counts in their saliva (p = 0.04), as well as in the palate (p = 0.028). C. albicans is an important factor in the development of DRS. Hyphae seem to facilitate the rise of C. albicans counts and be related to the inflammatory response of the tissues. Lactobacillus seems to play an important role in the presence of DRS, as well. In agreement with many other studies, the results of this study confirm the importance of denture age and continuous denture wearing in the development of DRS.

Impact of mandibular two-implant retained overdentures on life quality in a group of elderly Turkish edentulous patients

The aim of the study was to examine the influence of mandibular two-implant retained overdentures on life quality of elderly Turkish patients. The study population comprised 78 edentulous complete denture wearers (aged 65-82) seeking implant-retained mandibular overdentures at Istanbul University, Turkey. Every patient received 2 dental implants in the interforaminal region of the mandible and maxillary conventional dentures and mandibular implant retained overdentures 6 weeks after surgery. Turkish versions of oral health impact profile (OHIP-14) and the United Kingdom oral health-related quality of life (OHQoL-UK) were used for the evaluation of life quality before and after treatment. Compared to pretreatment scores, subjects had statistically significant improvements in life quality after receiving new dentures (p < 0.05). Based on these results, it can be concluded that mandibular two-implant retained overdentures improve the life quality of elderly edentulous Turkish patients.

The Effect of Mucine, IgA, Urea, and Lysozyme on the Corrosion Behavior of Various Non-precious Dental Alloys and Pure Titanium in Artificial Saliva

The corrosion of dental alloys has biological, functional, and aesthetic consequences. Various studies have shown that protein solutions can inhibit the corrosion of alloys. This study is planned to determine the relationship of organic constituents of saliva and the corrosion of dental alloys. The organic constituents are IgA, mucine, urea, and lysozyme which are encountered in the highest amounts in saliva and the dental materials are titanium (Ti), Co—Cr—Mo and Ni—Cr—Mo alloys, and dental amalgam, the most often used metallic components in dentistry. In particular, the interactions between the commonest salivary proteins, IgA, mucine, urea and lysozyme, and Ti, Co—Cr—Mo, Ni—Cr—Mo and dental amalgam were investigated. Each alloy was evaluated by cyclic polarization in each medium. The general anodic and cathodic behavior during forward and reverse cycles, the corrosion and passivation current densities (μA/cm2 ), and the corrosion and the pitting potentials (mV) were determined. The results have shown that Ni—Cr—Mo and dental amalgam alloys are highly susceptible to corrosion in all the investigated media. The Co—Cr—Mo alloy has shown high passive current densities in the solution of mucine and lysozyme in artificial saliva. Titanium instead, has shown a high resistance to corrosion and a stable passive behavior in all media, especially in a solution of mucine and IgA in synthetic saliva. Mucine and IgA, as well as urea and lysozyme, appeared to enhance the formation of a passive film layer on the Ti metal surface, thus inhibiting the corrosion. Based on the study findings, and especially considering the problem of nickel allergy and toxicity of mercury released from dental amalgam, the use of Co—Cr—Mo alloys and Ti to Ni—Cr—Mo alloys is recommended and alternatives to dental amalgam should be sought for patients with impaired salivary flow.

Immediate Loading: Three Cases with up to 38 Months of Clinical Follow-up

Since the first report describing the placement of dental implants into fresh extraction sockets, there has been an increasing interest in this technique. The advantages of immediate implant placement have been reported to include a reduction in the number of surgical interventions, potentially decreased alveolar bone resorption after tooth loss, and shorter treatment time. Appropriate indications, good surgical technique, and the use of a prosthetic protocol have resulted in success for immediate loading and immediate implantation. Adverse patient-related factors, such as systemic health, a smoking habit, poor oral hygiene, presence of a thin biotype, or an infection in the region of the extraction, are contraindications for this treatment. Patient satisfaction is very high, and some difficulties related to the implantation site in late implantations may be eliminated. This article reports on three cases of immediate loading with up to 30 months of clinical follow-up.

The efficacy of a topical gel with triester glycerol oxide in denture-related mucosal injuries

OBJECTIVE The efficacy of a topical gel with triester glycerol oxide for treating ulcerations related to new complete dentures was studied and compared with a placebo gel. MATERIALS AND METHODS Fifty edentulous patients were enrolled in this double-blind clinical study. All subjects received new maxillary and mandibular complete dentures and were recalled 1, 3 and 7 days after denture placement. Twenty-five subjects received topical gel with triester glycerol oxide (TGO), and 25 subjects received topical gel without TGO. At each visit, pain and discomfort with the new dentures was assessed, and at the last visit, healing of ulcerations was also graded by a clinician. Subjects also graded the gels taste, smell and ease of use. RESULTS Specifically, there was no statistically significant difference in ulcer healing (p > 0.05), ratings of smell, taste and ease of use (p > 0.05) or pain and discomfort scores (p > 0.05). However, within-group differences were observed in pain and discomfort scores between follow-up sessions (p = 0.01 for all comparisons). CONCLUSION Clinically, TGO gel is not effective in the treatment of mucosal injuries occurring following placement of complete dentures.

The effect of urea on the corrosion behavior of different dental alloys.

OBJECTIVE Intraoral corrosion of dental alloys has biological, functional, and esthetic consequences. Since it is well known that the salivary urea concentrations undergo changes with various diseases, the present study was undertaken to determine the effect of salivary urea concentrations on the corrosion behavior of commonly used dental casting alloys. MATERIALS AND METHODS Three casting alloys were subjected to polarization scans in synthetic saliva with three different urea concentrations. RESULTS Cyclic polarization clearly showed that urea levels above 20 mg/100 ml decreased corrosion current densities, increased the corrosion potentials and, at much higher urea levels, the breakdown potentials. CONCLUSION The data indicate that elevated urea levels reduced the corrosion susceptibility of all alloys, possibly through adsorption of organics onto the metal surface. This study indicates that corrosion testing performed in sterile saline or synthetic saliva without organic components could be misleading.

Clinical Comparison of Screw-Retained and Screwless Morse Taper Implant-Abutment Connections: One-year Postloading Results

PURPOSE The purpose of this study was to clinically evaluate the screwless Morse taper implant-abutment connection type, in which the retention screw is totally eliminated, in terms of stability, success, periodontal parameters, and marginal bone levels after 1 year of function by comparing it with a passive fit internal implant-abutment connection, wherein a space exists between the matching components. MATERIALS AND METHODS Each edentulous subject received an implant with a screwless Morse taper connection (MT) in the left canine area of the mandible and an implant with a screw-retained implant-abutment connection (SR) in the right canine area of the mandible. All implants were loaded 6 weeks later. All cases were restored with a cemented bar-retained mandibular overdenture opposing a maxillary complete denture. Clinical recalls at 6 months and 12 months postloading were scheduled and the MT and SR implants were compared in terms of success, survival, primary and secondary implant stability, marginal bone loss, soft tissue response, and mechanical complications. The results were statistically analyzed. RESULTS A total of 20 subjects were included (10 females, 10 males; average age: 61.60 years) and a total of 40 implants were inserted. No implant failure or technical problem was detected for either MT or SR implants. Marginal bone loss around MT and SR implants did not show any significant differences at 6 weeks after surgery (time of loading) or at 6 months or 12 months postloading (P > .05). Periodontal parameters such as gingival index and probing pocket depth of MT and SR implants likewise did not differ significantly at 6 months and 12 months postloading (P > .05). Primary stability values of MT and SR implants did not differ significantly when measured with the insertion torque device (mean of 68.10 Ncm for MT and 64.20 Ncm for SR implants; P = .564), nor when measured with the electronic percussive testing device (mean of -5.30 for the MT and -5.35 for the SR implants; P = .398). However, MT implants showed lower stability at the time of loading (6 weeks) and 6 months postloading (P = .037 and P = .003, respectively). Stability values did not show any significant differences 12 months postloading (P > .05). CONCLUSIONS Within the limitations of this clinical study, it can be concluded that implants with screwless Morse taper and passive fit internal connections show comparable technical and biologic results after 1 year of function.

TEK TAM VE ALT ÜST TAM PROTEZLERDE ÇİĞNEME YETENEĞİNİN DEĞERLENDİRİLMESİ-EVALUATION OF CHEWING ABILITY OF SINGLE AND FULL COMPLETE DENTURES

Ozet Dogal dislerin bir bolumunun veya tumunun kaybedilmesiyle stomatognatik sistemin noromuskuler ve noroartikuler uyumu bozulur. Boylece cigneme fonksiyonundaki verim de duser. Bu calismada, tek cenede ve alt, ust heriki cene kavsindeki dogal dislerin kaybinin cigneme performansinda (C.P) meydana getirdigi degisimler incelenmistir. Bu amaca yonelik olarak, klinigimize basvuran dogal disli 10 hasta (kontrol grubu), ust tam dissiz alt dogal disli 10 hasta, alt tam dissiz ust dogal disli 10 hasta, alt-ust tam dissiz 10 hasta (Deney grubu 1,2,3) olmak uzere toplam 40 hastada cigneme performansi testleri uygulanmistir. C.P degerleri, standart eleklerden gecen cignenmis yerfistigi (test yiyecegi) miktarinin toplam test yiyecegi miktarina bolunmesiyle elde edilmistir. C.P degerleri (% olarak X±Sd) dogal disli hastalarda 79.35±2.97, ust tek tam protez kullanan hastalarda 66.83±5.23, alt tek tam protez kullanan hastalarda 58.76±3.96 ve alt-ust tam protez kullanan hastalarda 50.91±2.76 olarak saptanmistir. Verilerin istatistiksel degerlendirmesi ANOVA ve sonrasinda Tukey HSD testi ile yapilmistir. Deney ve kontrol gruplarindan elde edilen cigneme performansi degerleri arasindaki farklar anlamli bulunmustur (d<0.05). Abstract Neuromuscular and neuroarticular balance of the stomatognatic system would be lost when dental arches become partialy or totaly edentulous. Thus, masticatory function would also be deminished. In this study, the amount of variation in the masticatory performance was investigated for single and full complete denture patients. 40 patients who refered to our clinic were randomly selected and divided in to four groups with 10 patients in each group according to the following criteria. a) all with natural teeth (control) b) with maxillary natural teeth and mandibular edentulous dental arch c) with mandibular natural teeth and maxillary edentulous dental arch and d) completely edentulous. Masticatory performance were measured by dividing the volume of chewed peanuts passing through standard sieves by the volume of the particles poured on each sieve. The masticatory performance data (X±sd as %) for patients with all natural teeth were: 79.35 ± 2.97, for patients having mandibular natural teeth and maxillary edentulous dental arch were: 66.83±5.23, for patients having maxillary natural teeth and mandibular edentulous dental arch were: 58.76±3.96, and for complete edentulous patients were: 50.91 ±2. 76. The statistical analysis of the data were made by using ANOVA and Tukeys HSD test (p<0.05). It was concluded from this study that the means of the all four groups (including control) were found significantly different among each other.

İSKELET PROTEZLİ HASTALARDA KURONLANMAMIŞ DESTEK DİŞLERDEKİ TIRNAK YUVALARININ BAKTERİ PLAĞI YÖNÜNDEN İNCELENMESİ-EVALUA TION OF DENTAL PLA QUE FORMATION OCCVRED IN REST SEA T PREPARED ON NON-RESTORED TEETH

OZET Hareketli parsiyel protezlerde vertikal yonde destegi saglamak uzere dis uzerinde hazirlanan yuvalara protezlerin bir komponenti olan tirnaklar oturtulmaktadir. Calismamizda ust ve alt cenede tirnak yuvasi acilmamis ve acilmis destek disler protez Oncesi ve sonrasi oklu-zal plak skorlari, plak total bakteri sayisi, plak ve tukuruk mutans streptokok sayisi acisindan degerlendirilmistir. Hareketli parsiyel protez uygulamasindan sonra tum degerlerde anlamli bir artis saptanmistir. Anahtar sozcukler: Hareketle parsiyel protez, tirnak yuvasi, bakteri plagi ABSTRACT Rest are components of removable cost partial dentures that provide, vertical support and occlusal plaque scores, total bacteria counts in plaque and streptoccus mutans counts in plaque and saliva were evaluated. When rest seats were prepared and were not prepared both at maxillary and mandibular teeth and when dentures used versus no dentures used by patient. It was concluded that when removable partial dentures were worn significant increase in number of occlusal plaque scores, total bacteria counts in plaque and streptoco-cus mutans counts in plaque and saliva were obtained. Key words; Removable partial dentures, rest seat, dental plaque.