19 research outputs found
Screening of Fixed Prosthodontic Dentures after Five Years of Use in Relation to Material and Construction
The aim of this study was to screen patients with fixed prosthodontic appliances that
were in oral cavity for a period of 5 years or more and to assess clinically and radiologically
root caries, gingival recession, pocket formation, alveolar ridge resorption, as well
as gingival (GI) and plaque index (PI). The aim also was to find out the differences between
materials and constructions, between abutment and non-abutment teeth, and to
find out the need for replacement. A total of 260 patients and their orthopantomograms
were examined, with a total of 2,265 teeth, 610 being bridge abutments and 246 being
crowns. The most frequent were metal+ acrylic veneer crowns or bridges. Root caries
was found under the abutments in 10ā20%; however abutments with ceramic crowns
had the lowest percentage of caries (p<0.01). Alveolar ridge resorption, pocket formation
deeper than 3 mm and gingival recession of various degree was found in 50% of the
cases, again with the lowest percentage of ceramic-fused-to-metal appliances (p<0.01).
Pocket depth was registered in significantly higher percentage in metal-acrylic veneer
appliances compared to natural teeth (p<0.01), while there was no significant difference
between metal-ceramic appliances and natural teeth (p>0.05). Although the worst findings
were recorded for metal-+acrylic veneer crowns for PI, no significant difference existed
between crowns of different material or non-abutment teeth (p>0.05). There was
statistically significant difference between abutments with metal + acrylic veneer crowns,
full metal crowns, metal ceramic crowns and non-abutments for GI scores. Higher percentage
of scores 0 and 1 was recorded for metal ceramic crowns and non-abutments
and significantly higher percentage of scores 2 and 3 was recorded for metal + acrylic
veneer crowns and full metallic crowns. Almost 50% of metal-ceramic abutments had no
pathologic findings. Almost 30% of the patients needed replacement, or even some abutments
to be extracted and therefore a new prosthodontic appliance
A Comparison of Trace Element (TE) Release from High Noble Au-Pt Alloy and Base Co-Cr-Mo Alloy Under In Vitro Conditions of Imitating Oral Saliva
In a moist environment electrochemical conditions lead to release of metal ions into the patient\u27s saliva. The aim of this study was to examine and compare the types and quantities of metal ions released from two alloys: AuPt alloy and Co-Cr-Mo alloy under in vitro conditions, imitating artificial saliva. We soaked ten sets of Au-Pt
alloy pieces having 133 mm2 exposure surface and ten sets of Co-Cr-Mo alloy (WironitR, Bego, Germany) pieces having 497 mm2 exposure surface for 1, 2, 3, 4, 5, 6, 7, 14, 21 and 30 days (six pieces each set) in phosphate buffered saline (pH 6.0) to mimic dental saliva. TE in the phosphate buffered saline (saliva) were assessed by ICP-AES (JY 50P, Jobin-Ywon, France) with the detection
limit of 10 mg/L. We found detectable amounts (mg/L) of TE (Mean SD) released from Au-Pt alloy (Mean SD): Zn 124 (51), Cu 53 (63), Fe 15 (11) and Cr 18 (25) and detectable amounts of TE released from Co- Cr-Mo alloy (Mean SD): Co 337 (170), Fe 21 (15) Zn
87 (56), Ni 41 (68), and Cr 49 (42). The manufacturer did not indicate the presence of Zn and Fe in the Au-Pt alloy and the presence of Fe, Zn, and Ni in the Co-Cr- Mo alloy. Significantly higher amount of Zn was released from high noble AuPt alloy than from Co-Cr-Mo alloy (p<0.05) and a significantly higher amount of Cr was
released from Co-Cr--Mo alloy than from Au-Pt alloy. There was no significant difference in the amount of Fe ions released between the two alloys (p>0.05). We must keep in mind that the amount of released TE may be much higher than the reported values after laboratory procedures (casting, polishing, etc.) and, moreover, other TE may become detectable
Analysis of Occlusal Contacts in Different Types of Prosthodontic Appliances, Eichner Classifications, Presence RCP-ICP Slide and the Type of Occlusion
The aim of the study was to determine the number and the type of the occlusal contacts
(strong, weak) with respect to the type of the prosthodontic appliance (fixed, removable,
combined fixed-removable) and with respect to the Eichner classification in patients
with their appliances being in a good function for a long time. The aim of the
study was also to determine the number and the type of the occlusal contacts (strong,
weak) with respect to the type of occlusion (canine guided, group function or balanced)
and the presence of the RCP-ICP slide. A total of 440 patients with different types of
prosthodontic appliances were examined for the antagonistic occlusal contacts using
occlusal strips of 11 m and 50 m. The average number of occlusal contacts was 10.5 for
the upper and 10.46 for the lower posterior teeth, approximately 5 on each side of the
tooth arch. The results of the study suggest that the biggest number of occlusal contacts
were recorded for the small span fixed appliances (2 on average), the greater span fixed
and fixed-removable prosthodontic appliances exhibited 1.6 occlusal contacts, and the
removable complete denture exhibited 1.2 contact per the tooth in the posterior region.
The number of the hard occlusal contacts was significantly greater in fixed and fixedremovable
prosthodontic appliances in comparison with the complete dentures (p <
0.05), while there was no significant difference between the prosthodontic appliances for
the weak occlusal contacts (p > 0.05). The overall number of the occlusal contacts, as
well as the number of the hard occlusal contacts was significantly greater in the Eichner
class I cases (p < 0.05) in comparison with the Eichner classes II and III. The number of
the weak occlusal contacts showed no significant differences with respect to the Eichner
classification (p > 0.05). There was no significant difference in the number of occlusal
contacts between the appliances with RCP-ICP slide and where ICP and RCP corresponded
(p > 0.05)
Type And Material of Fixed Prosthodontic Appliances in Patients Living in the Region of MetkoviÄ
The aim of this study was to evaluate the type and the aesthetic material in relation to age, gender, level of education, employment, socio-economic status and frequency of visits to the dentist. The examination was performed on 212 patients who had a fixed prosthodontic appliance for more than a year (55% males and 45% females, age 18-80 yrs.). The following conclusions were made: 1. The older patients and retired patients had significantly more bridges than crowns (p0.05). Patients who visit their dentist regularly have significantly more crowns than bridges than
patients who visit their dentist irregularly or when in pain (p0.05). 2. Almost all fixed prosthodontic appliances older than 10 years were made of porcelain (98%), while acrylic veneer crowns were more frequent in appliances
older than 10 or 15 years (p0.05). Patients older than 60 years had more acrylic material compared to younger patients. While patients younger than 39 years had almost exclusively ceramic
appliances (p<0.01). Less educated patients had more acrylic veneer appliances. Employed patients had significantly more ceramic appliances than retired patients
Investigation of Ion Release from Ni-Cr Alloy in Various Acidity Conditions
Cytotoxicity is in direct correlation to the level of ion release, with non-precious alloys having higher ion release than that of precious alloys. The most often used non-precious dental alloy is Ni-Cr alloy.
The aim of the investigation was to determine the type and quantity of ions released from Ni-Cr alloy (Wiron 99(r), Bego, Germany), in acid solutions with different pH values, and to determine the influence of the type of acid solution, its pH value, and duration of interaction on ion release. The overall sample consisted of 180 pieces of
Ni-Cr alloy, 60 samples submerged in each of three different solutions (buffered phosphate solutions pH 3.5 and pH6, and lactic acid solution pH 3.5). Quantity of ion release was measured on solution samples taken at 10 different time intervals by means of the ICP-AES method. Average release of Ni ions in lactic acid solution was
432.42 Ī¼g/L, while the highest average Ni+ ions release of 541.67Ī¼g/L was measured in buffered phosphate solution pH 6.0. MANOVA demonstrated significant influence of the type of solution on Ni ion release (p<0.01), while the time of exposure was not a significant factor (p=0.23). Zn ions demonstrated the lowest average ion release (88.95 Ī¼g/L, phosphate solution pH 3.5). Statistically
significant influence of the type of solution and pH value on ion release was determined, except for chromium ions (p<0.05). Dentobacterial plaque acidity is sufficient to start corrosion of Ni-Cr dental alloys
Relationship Between the Face and the Tooth Form
The aim of this study was to re-examine Leon Williams geometric theory and to find
the degree of correspondence between the face and the tooth form in the population of
Zenica, Bosnia and Herzegovina. Two thousand individuals with intact frontal teeth, in
age between 17 and 24 years, were measured for 3 horizontal distances on the face: temporal
width (Ft-Ft), zygomatic width (Zyg-Zyg) and gonial width (Go-Go) and for 3 horizontal
distances on the both upper incisors: cervical width (CW), contact point width
(CPW) and incisal width (IW). The length of the face (Tr-Gn) as well as the length of the
central maxillary incisors were also measured. The results revealed: 1. Men had significantly
larger dimensions for all facial and tooth dimensions (p < 0.05) than women, except
for the cervical tooth width (p > 0.05); the left and the right central incisors were of
identical dimensions and forms (p > 0.05). 2. The width of upper central incisors were
smaller approximately 1.5 mm than in west Europeans. 3. Upon the relation between
the 3 horizontal dimensions measured on the face and upper maxillary incisor, 11 facial
forms and 10 upper central tooth forms could be recognised in the study population, but
98% of the population had only 3 tooth and face forms. Face shapes: oval face ā 83.3%,
square-tapered face ā 9.2% and tapered face ā 7%; tooth forms: tapered-square incisor ā
53%, oval incisor ā 30%, tappered incisor ā 16%. 4. Reversed and enlarged tooth form
was in line associated with the facial form in only 30%, while the most common combination
was of the oval face form and the tapered-square central incisor (45%). 5. These
results disapprove Williamās theory and may be helpful for the choice of artificial teeth
in complete denture construction and the dental industry
The Satisfaction with the Removable Partial Denture Therapy in the Croatian Adult Population
Little is known about the outcomes of treatment and patientās satisfaction with removable
partial dentures in adult Croatian population. Therefore patientās satisfaction
with their partial dentures in relation to some socio-economic variables was studied.
Patientās satisfaction with denture retention, speech, aesthetics, comfort of wearing dentures,
chewing ability was also studied in relation to different denture classification,
construction, material, denture base shape (major connectors), denture support and the
number of missing teeth. A total of 165 patients, 59 males and 105 females between 38
and 87 years took part in this study. A questionnaire, devised for a purpose of the study,
was divided into three parts. In the first part, patients answered questions about age,
gender, marital status, education, general health, socio-economic status, self-supporting
life, period of tooth loss and number of previous denture experiences and in the second
part, patients graded their partial dentures, depending on the level of satisfaction, by
using a scale from 1 to 5. In the third part a dentist determined Kennedy classification
and their modifications, denture material and denture support, denture base shape and
the number of missing teeth and graded a denture construction. Influence of these factors
on patientās satisfaction was analyzed. A majority of the examined patients were
satisfied with the partial prosthesis, but a small amount of dissatisfaction existed. More
then half of them scored all the examined parameters to the best score category. Considering
chewing with lower partial dentures, women were more satisfied than men (p
<0.05). Patients with more missing teeth gave lower grades for the comfort of wearing
dentures (p<0.05). Patients of higher education gave lower grades (p<0.05) for the aesthetics.
Patients were not satisfied with speech if the dentist graded a construction of alower partial denture low (p<0.05). Dissatisfaction was related to mastication, aesthetics,
number of missing teeth and ability of speech. These findings can aid a clinician in
discussing a treatment plan and help a patient understand the risk of dissatisfaction in
the presence of certain factors