Clinical Aspects of Combination of Aesthetic Fixed Prosthetic Appliances

The objective of the research was to study the peculiarities of the combination of zirconia and ceramic occlusal surfaces when constructing aesthetic fixed prosthetic appliances.Materials and methods. The study included 70 patients with zirconia and ceramic occlusal surfaces of aesthetic fixed dental prostheses. Group I included 24 patients with a combination of zirconia and ceramic occlusal surfaces. Group II included 30 patients with a combination of ceramic occlusal surfaces. Group III included 16 patients with a combination of zirconia occlusal surfaces. All the patients were observed 12 and 24 months after prosthetic repair.Results. 12 and 24 months after prosthetic repair, the occlusal contact surface area was the largest in Group II (8.18±0.16 mm2 and 9.17±0.1 mm2, respectively). In Group I, where only one occlusive surface was made of zirconium dioxide, significantly reduced levels of abrasion were observed as compared to Group II – 8.07±0.21 mm2 and 8.65±0.23 mm2, respectively. 36 months after denture wearing, in Group III, the smallest contact surface area – 7.84±0.15 mm2as well as the lowest growth of the surface area was observed – 8.07±0.13 mm2.Conclusions. Dental prostheses with at least one ceramic occlusal surface exhibit a strong tendency to abrasion and, consequently, to an increase in the occlusal surface area resulting in an excessive load on prosthetic appliance. Moreover, functional and aesthetic values of prosthetic prosthesis sharply decrease. Therefore, we recommend to produce zirconia occlusal surface or at least to combine the same materials, as it will increase the longevity of prosthetic appliance.

Download Full-text

Clinical Aspects of Combination of Ceramic and Acrylic Occlusal Surfaces

Galician Medical Journal ◽

10.21802/gmj.2017.1.8 ◽

2017 ◽

Vol 24 (1) ◽

pp. 201718

Author(s):

Z. Ozhohan ◽

Andrii Biben

Keyword(s):

Surface Area ◽

Contact Surface ◽

Abrasion Resistance ◽

Acrylic Resin ◽

Occlusal Contact ◽

Contact Surface Area ◽

Dental Prostheses ◽

Group I ◽

Occlusal Surfaces ◽

Group Ii

The objective of the research was to develop and substantiate the methods of constructing the occlusal surfaces when manufacturing aesthetic fixed restorations through the combination of different materials.Materials and methods. The study included 65 patients with ceramic and acrylic occlusal surfaces of aesthetic fixed dental prostheses. Group I included 21 patients with a combination of ceramic and acrylic occlusal surfaces. Group II included 22 patients with a combination of ceramic occlusal surfaces. Group III included 22 patients with a combination of acrylic occlusal surfaces. The patients were observed 3, 6 and 12 months after prosthetic repair.Results. The greatest increase in the occlusal contact surface area of fixed restorations was observed in Group I, that is, when combining dental prostheses with ceramic and acrylic occlusal surfaces. Considering uneven abrasion of the occlusal surfaces, we do not recommend to combine different materials when veneering the occlusal surface of the antagonistic teeth.Conclusions. This study demonstrated the important role of the correct combination of materials when veneering the occlusal surfaces. Physical and chemical properties of materials, namely the abrasion resistance play a significant role in the long-term denture functioning.The smallest increase in the occlusal contact surface area was observed in Group II when combining ceramic occlusal surfaces. It was due to a good abrasion resistance of ceramics as compared to acrylic resin as well as the presence of the glazed layer which prevents the premature abrasion of the occlusal surfaces of the antagonistic teeth due to lower surface roughness.The combination of acrylic resin and ceramics when constructing the occlusal surfaces of fixed restorations in Group I demonstrated the highest rate of the increase in the occlusal contact surface area – 9.93%. It was due to a low hardness of acrylic resin and its high surface roughness. In addition, there was observed an uneven abrasion of the occlusal surfaces resulting in periodontal tissue overload, thereby negatively affecting denture functioning.

Download Full-text

Clinical Effectiveness of Using Aesthetic Fixed Prosthetic Appliances with Combined Occlusal Surface

Galician Medical Journal ◽

10.21802/gmj.2017.2.5 ◽

2017 ◽

Vol 24 (2) ◽

Cited By ~ 1

Author(s):

Andrii Biben ◽

Zinovii Ozhohan

Keyword(s):

Surface Area ◽

Contact Surface ◽

Zirconium Dioxide ◽

Clinical Effectiveness ◽

Occlusal Surface ◽

Prosthetic Repair ◽

Occlusal Contact ◽

Contact Surface Area ◽

Group I ◽

Group Ii

The objective of the research was to evaluate the clinical effectiveness of using aesthetic fixed prosthetic appliances with combined occlusal surface.Materials and methods. The study included 30 patients who were divided into 2 groups: Group I included 20 patients with combined occlusal surface of the crowns; Group II included 22 patients with ceramic occlusal surface of the crowns. The patients were observed 3, 6 and 12 months after prosthetic repair.Results. 6 months after prosthetic repair, the occlusal contact surface area in Group I increased by 0.79%, while in Group II, it increased by 1.4%.12 months after prosthetic repair, the occlusal contact surface area in Group I and Group II increased by 2.37% and 5%, respectively.The aforementioned data indicated that the occlusal contact surface area increased as the period of ceramic fixed prosthetic appliance wearing increased.When combining the occlusal surface in dental prostheses, the occlusal contact surface area increased approximately 2 times slower. The study demonstrated convincingly that crowns burnt on a zirconium dioxide frame were a better choice as compared to cast framework made of nickel-cobalt-chrome alloy. In case of cast frameworks, the indicators of crown margin discrepancy were worse than in case of milled frameworks - 15% versus 5%, respectively. In addition, one cast framework crown (5%) in Group II was remodeled and one crown (5%) was recemented.Conclusions. Aesthetic fixed prosthetic appliances with combined occlusal surface demonstrated high functional and aesthetic characteristics. The use of the USHPS system showed a decisive advantage of milled frameworks and combined occlusal surface over traditional cast ceramic frameworks.The combination of high mechanical, strength and tribological properties of zirconium dioxide and high biological as well as aesthetic properties of ceramic materials helped reveal high clinical characteristics of aesthetic appliances with combined occlusal surface.

Download Full-text

Quality Assessment of Prosthetic Rehabilitation Using Aesthetic Fixed Restorations

Galician Medical Journal ◽

10.21802/gmj.2018.1.1 ◽

2018 ◽

Vol 25 (1) ◽

Author(s):

Zinovii Ozhohan ◽

Andrii Biben

Keyword(s):

Construction Materials ◽

Clinical Effectiveness ◽

Clinical Results ◽

Occlusal Surface ◽

Prosthetic Rehabilitation ◽

Group Iii ◽

Group I ◽

Occlusal Surfaces ◽

Group Ii ◽

High Level

The objective of the research was to study and assess the quality of prosthetic treatment using aesthetic fixed restorations.Materials and methods. The study included 79 patients without a comorbidity who underwent prosthetic rehabilitation. All the patients were divided into 3 groups: Group I included 25 patients with metal-plastic restorations; Group II comprised 34 patients with porcelain-fused-to-metal restorations; Group III consisted of 20 patients with a combined occlusal surface of prosthetic restorations. The patients were observed 6 months after prosthetic repair. Only patients with single molar and premolar crowns were examined. Bridge prostheses were not taken into account in order to eliminate the effect of masticatory force redistribution on the abutment crowns.Results. In Group I, 11 (44%) patients were satisfied with the results of prosthetic treatment. In Group II, 25 (78.12%) patients reported that they were satisfied with their treatment. In Group III, there were 17 (85%) patients satisfied with their outcome. However, the patients’ complaints are often subjective and do not fully reflect the objective state of the dentoalveolar system. An objective examination revealed that in indirect restorations, marginal periodontium pathology is typical. Conclusions. Aesthetic fixed restorations with a combined occlusal surface have demonstrated good clinical results, even at long-term follow-up. Combining positive properties of two different construction materials, namely zirconium dioxide and ceramics, they reduce the risk of complications such as marginal periodontium pathology and chipping along the occlusal surface as well as contribute to minimal abrasion of the occlusal surfaces of the antagonistic teeth. We cannot recommend metal-plastic restorations due to their low clinical effectiveness, poor aesthetic qualities as well as a high level of marginal periodontium pathology.

Download Full-text

Oxygen Fraction Adjustment According to Body Surface Area during Extracorporeal Circulation

The Heart Surgery Forum ◽

10.1532/hsf.1325 ◽

2015 ◽

Vol 18 (3) ◽

pp. 098

Author(s):

Cem Arıtürk ◽

Serpil Ustalar Özgen ◽

Behiç Danışan ◽

Hasan Karabulut ◽

Fevzi Toraman

Keyword(s):

Body Temperature ◽

Surface Area ◽

Body Surface Area ◽

Body Surface ◽

Extracorporeal Circulation ◽

Group Iii ◽

Oxygen Fraction ◽

Arterial Blood ◽

Group I ◽

Group Ii

Background: The inspiratory oxygen fraction (FiO2) is usually set between 60% and 100% during conventional extracorporeal circulation (ECC). However, this strategy causes partial oxygen pressure (PaO2) to reach hyperoxemic levels (>180 mmHg). During anesthetic management of cardiothoracic surgery it is important to keep PaO2 levels between 80-180 mmHg. The aim of this study was to assess whether adjusting FiO2 levels in accordance with body temperature and body surface area (BSA) during ECC is an effective method for maintaining normoxemic PaO2 during cardiac surgery.Methods: After approval from the Ethics Committee of the University of Acıbadem, informed consent was given from 60 patients. FiO2 adjustment strategies applied to the patients in the groups were as follows: FiO2 levels were set as 0.21 × BSA during hypothermia and 0.21 × BSA + 10 during rewarming in Group I; 0.18 × BSA during hypothermia and 0.18 × BSA + 15 during rewarming in Group II; and 0.18 × BSA during hypothermia and variable with body temperature during rewarming in Group III. Arterial blood gas values and hemodynamic parameters were recorded before ECC (T1); at the 10th minute of cross clamp (T2); when the esophageal temperature (OT) reached 34°C (T3); when OT reached 36°C (T4); and just before the cessation of ECC (T5).Results: Mean PaO2 was significantly higher in Group I than in Group II at T2 and T3 (P = .0001 and P = .0001, respectively); in Group I than in Group III at T1 (P = .02); and in Group II than in Group III at T2, T3, and T4 (P = .0001 for all). Conclusion: Adjustment of FiO2 according to BSA rather than keeping it at a constant level is more appropriate for keeping PaO2 between safe level limits. However, since oxygen consumption of cells vary with body temperature, it would be appropriate to set FiO2 levels in concordance with the body temperature in the rewarming period.

Download Full-text

Effect of Enamel Deproteinization in Primary Teeth

Journal of Clinical Pediatric Dentistry ◽

10.17796/1053-4628-42.1.8 ◽

2018 ◽

Vol 42 (1) ◽

pp. 45-49 ◽

Cited By ~ 2

Author(s):

Ananthi Christopher ◽

R Krishnakumar ◽

N Venugopal Reddy ◽

G Rohini

Keyword(s):

Surface Area ◽

Group Iv ◽

Enamel Surface ◽

Tooth Surface ◽

Type I ◽

Group Iii ◽

Group I ◽

Electron Microscope Analysis ◽

Group Ii ◽

Quality Type

Objective: To evaluate and compare the topographical features of enamel surface, etched with different materials. Study Design: 10 extracted human primary molars were randomly selected and cut and trimmed to 1 mm2. Each group comprised of 10 blocks and the enamel was treated as follows: Group I–35% H3PO4; Group II–5.25% NaOCl + 35% H3PO4 ;Group III–5.25% NaOCl; Group IV no treatment was carried out. All the samples were prepared for Scanning electron microscope analysis. The images were obtained and evaluated for the quality type I–II etching of the enamel surface using Auto-CAD 2011 software. Statistical Analysis Used: Wilcoxon Signed Ranks Test (p<0.001). Results: The mean surface area of type I and II etching pattern values for Group- I was 39608.18 μm2 and Group- II was 45051.34 μm2. Conclusion: Deproteinization with 5.25% Sodium hypochlorite prior to acid etching could be used to increase the surface area of adhesion of composite material with the tooth surface.

Download Full-text

Characteristics of Periodontal Tissues in Prosthetic Treatment with Fixed Dental Prostheses

Molecules ◽

10.3390/molecules26051331 ◽

2021 ◽

Vol 26 (5) ◽

pp. 1331

Author(s):

Anna Avetisyan ◽

Marina Markaryan ◽

Dinesh Rokaya ◽

Marcos Roberto Tovani-Palone ◽

Muhammad Sohail Zafar ◽

...

Keyword(s):

Periodontal Diseases ◽

Group Iii ◽

Periodontal Tissues ◽

Dental Prostheses ◽

Group I ◽

Periodontal Index ◽

Computer Aided ◽

Cad Cam ◽

Group Ii ◽

Gingival Biotype

The objective of the present study was to investigate the effects of various types of fixed prostheses on periodontal tissues and explore the association of gingival biotype and gum recession in relation to prosthesis types. The study participants (N = 95) were divided into three groups based on the type of dental prosthesis: Group-I: cobalt-chrome (Co-Cr) ceramic prosthesis fabricated by the conventional method (n = 35); Group-II: consisted of patients with Co-Cr ceramic prostheses fabricated by a computer-aided design and computer aided manufacturing (CAD/CAM) technique (n = 30); and Group-III: zirconia-based prostheses fabricated by the CAD/CAM technique (n = 30). Following the use of prostheses, periodontal examinations were performed using the Community Periodontal Index (CPI) and Modified Approximal Plaque Index (MAPI). In addition, the gingival biotype was examined using a probe transparency method. The Statistical Package for the Social Sciences (SPSS), Version 20 (IBM Company, Chicago, IL, USA), was used to analyze the results, and the significance level was set at p = 0.05. It showed the MAPI results after the use of prosthetic rehabilitation for 12 months of periodontitis in 87.9% ± 15.4 of patients in Group-I, in 80.6% ± 17.97 in those in Group-II, and in 62.5% ± 21.4 in those in Group-III (p < 0.01). The CPI index results indicated a high prevalence of periodontal disease in all groups. The number of people with healthy periodontium constituted 17.1% of patients in Group-I, 24.2% in Group-II, and 37.1% in Group-III. Our study concluded that prosthetic treatment with periodontal diseases showed better outcomes while using dental prostheses fabricated by the CAD/CAM technique compared to the conventionally fabricated dental prostheses. The thin gingival biotype is more often associated with gingival recession than the thick biotype.

Download Full-text

Effect of microwave treatments on dimensional accuracy of maxillary acrylic resin denture base

Brazilian Dental Journal ◽

10.1590/s0103-64402005000200006 ◽

2005 ◽

Vol 16 (2) ◽

pp. 119-123 ◽

Cited By ~ 22

Author(s):

Sabrina Pavan ◽

João Neudenir Arioli Filho ◽

Paulo Henrique dos Santos ◽

Francisco de Assis Mollo Jr.

Keyword(s):

Dimensional Accuracy ◽

Acrylic Resin ◽

Microwave Treatment ◽

Control Group ◽

Denture Base ◽

Group Iii ◽

Dental Prostheses ◽

Group I ◽

Group Ii ◽

Cycle Group

Microwave energy has been used as an alternative method for disinfection and sterilization of dental prostheses. This study evaluated the influence of microwave treatment on dimensional accuracy along the posterior palatal border of maxillary acrylic resin denture bases processed by water-bath curing. Thirty maxillary acrylic bases (3-mm-thick) were made on cast models with Clássico acrylic resin using routine technique. After polymerization and cooling, the sets were deflasked and the bases were stored in water for 30 days. Thereafter, the specimens were assigned to 3 groups (n=10), as follows: group I (control) was not submitted to any disinfection cycle; group II was submitted to microwave disinfection for 3 min at 500 W; and in group III microwaving was done for 10 min at 604 W. The acrylic bases were fixed on their respective casts with instant adhesive (Super Bonder®) and the base/cast sets were sectioned transversally in the posterior palatal zone. The existence of gaps between the casts and acrylic bases was assessed using a profile projector at 5 points. No statistically significant differences were observed between the control group and group II. However, group III differed statistically from the others (p<0.05). Treatment in microwave oven at 604 W for 10 min produced the greatest discrepancies in the adaptation of maxillary acrylic resin denture bases to the stone casts.

Download Full-text

Proliferation of odontoblast-like cells following application of a combination of calcium hydroxide and propolis

Dental Journal (Majalah Kedokteran Gigi) ◽

10.20473/j.djmkg.v52.i4.p183-186 ◽

2019 ◽

Vol 52 (4) ◽

pp. 183

Author(s):

Ira Widjiastuti ◽

Sri Kunarti ◽

Fauziah Diajeng Retnaningsih ◽

Evri Kusumah Ningtyas ◽

Debby Fauziah Suryani ◽

...

Keyword(s):

Calcium Hydroxide ◽

Wistar Rats ◽

Control Group ◽

Group V ◽

Propolis Extract ◽

Group Iii ◽

Group I ◽

Occlusal Surfaces ◽

Significant Difference ◽

Group Ii

Background: One purpose of operative dentistry is the maintenance of healthy pulp by reducing the need for root canal treatment and the possibility of undesirable scenarios such as tooth loss. Propolis is a plant-derived substance that contains a resin produced by honeybees belonging to the Apis mellifera species. Purpose: This study aimed to investigate the effect of a combination of calcium hydroxide (Ca(OH)2) and propolis extract on odontoblast-like cell proliferation in Wistar rats (Rattus norvegicus). Methods: This research constituted a true experimental laboratory-based investigation with post-test control group design. Thirty Wistar rats were randomly divided into six groups. The first molar pulp of each sample was perforated on occlusal surfaces using a low speed round bur. On day 3, the samples were divided into six groups (n=10): Group I: control; Group II: Ca(OH)2 + 11%; propolis extract; Group III: Ca(OH)2 + aquadest, and on day 7: Group IV: control; Group V: Ca(OH)2 + 11% propolis extract; Group VI: Ca(OH)2 + aquadest. All samples were filled with restorative material. They were subsequently sacrificed after 3 and 7 days post-pulp capping administration and the afflicted tooth extracted for hematoxylin and eosin (H&E) staining. The resulting data was subjected to statistical analysis to ascertain the proliferation of odontoblast-like cells. The significance of differences between the groups was determined by a one-way ANOVA test followed by a post hoc Tuckey HSD. A p-value <0.05 was considered to be significant. Results: On day 3, a significant difference existed between group II (Ca(OH)2–propolis) and group I (control group) and group III (Ca(OH)2–aquades), whereas Ca(OH)2–propolis revealed that the proliferation of odontoblast-like cells was higher. Meanwhile, on day 7, there was a significant difference between all groups whereas, with regard to Ca(OH)2–propolis, the proliferation of odontoblast-like cells in group V was higher. Conclusion: Application of combination of Ca(OH)2-propolis extract can increase the proliferation of odontoblast-like cells in pulp tissue on days 3 and 7.

Download Full-text

The functional and structural changes of the glomerulus throughout the course of murine lupus nephritis.

Journal of the American Society of Nephrology ◽

10.1681/asn.v34930 ◽

1992 ◽

Vol 3 (4) ◽

pp. 930-939

Author(s):

B A Kiberd

Keyword(s):

Lupus Nephritis ◽

Surface Area ◽

Structural Changes ◽

Hydraulic Permeability ◽

Slight Reduction ◽

Mesangial Matrix ◽

Group Iii ◽

Group I ◽

Matrix Expansion ◽

Group Ii

The glomerular functional and structural changes in a murine model (MRL-lpr/lpr) of progressive lupus nephritis were studied. Animals were grouped into three age categories. (I, 14 wk; II, 20 wk; and III, 26 wk). GFR fell with age (257 +/- 43, 178 +/- 50, and 150 +/- 40 microL/min for Groups I through III, respectively). Similarly, the ultrafiltration coefficient (Kf) measured on isolated glomeruli fell with time (0.030 +/- 0.006, 0.023 +/- 0.006, and 0.013 +/- 0.002 nL/s/mm Hg, respectively). Both indomethacin and a selective thromboxane receptor antagonist L-670,596 significantly improved GFR in Group II animals to values seen in Group I animals. Neither agent had any effect to increase GFR in older group III animals. L-670,596 had no effect on Kf in Group II or III animals. Glomerular morphometric evaluation demonstrated a progressive rise in glomerular tuft volume, mesangial matrix expansion, proliferation in cells, and a reduction in open capillary loops and epithelial filtration slits with age. However, because of the increase in glomerular volume, calculated surface area remained well preserved over the three respective groups (61 +/- 18, 76 +/- 15, and 71 +/- 13 microns2 x 10(3)). Therefore, the fall in Kf is likely due to a fall in hydraulic permeability (Lp). The ultrastructural component of the glomerular capillary wall that correlated best with Lp was the epithelial filtration slit number per micrometer of glomerular basement length (r = 0.73; P < 0.0001), which suggests that the structural correlate Kf is in the filtration slit length (FSL). Despite the cell proliferation and mesangial matrix expansion in early disease (Group II), the overall FSL remains stable because of a slight increase in filtration surface area and a slight reduction in epithelial slits per micrometer of glomerular basement membrane. The fall in GFR appears to be hemodynamically mediated by thromboxane A2. In older Group III animals, the fall in GFR appears to be due to a 40% reduction in FSL rather than being hemodynamically based. Thus, the early improvement in function with pharmacological agents is deceptive because considerable disease may be present because of adaptive structural changes. Eventually, with disease progression, compensating hemodynamic and structural factors fail to maintain GFR within normal limits.

Download Full-text

Ultrastructural Lesions Produced by Alcohol and Sucrose in the Heart and Liver of C57BL Mice

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100068035 ◽

1970 ◽

Vol 28 ◽

pp. 208-209

Author(s):

K.K. SEKHRI ◽

C.S. ALEXANDER ◽

H.T. NAGASAWA

Keyword(s):

Osmium Tetroxide ◽

Male Mice ◽

Alcohol Group ◽

Group Iii ◽

Group I ◽

C57bl Mice ◽

Group Ii

C57BL male mice (Jackson Lab., Bar Harbor, Maine) weighing about 18 gms were randomly divided into three groups: group I was fed sweetened liquid alcohol diet (modified Schenkl) in which 36% of the calories were derived from alcohol; group II was maintained on a similar diet but alcohol was isocalorically substituted by sucrose; group III was fed regular mouse chow ad lib for five months. Liver and heart tissues were fixed in 2.5% cacodylate buffered glutaraldehyde, post-fixed in 2% osmium tetroxide and embedded in Epon-araldite.

Download Full-text