JofIMAB-2016-vol22-issue3

More documents

Recommendations

Info

The magnitude of the force of every denture is registered by using traction force with direction perpendicular to the occlusal plane. (fig. 5 and fig. 6) The dislodging force which is needed for the separation of every denture form the denture bearing area is measured in N (newton) by a dynamometer (with a scale up to 20 N) (fig. 7) or it is calculated by a formula (1kgf H” 9,8) when an electronic scale is used (at values above 20 N). Fig. 5. Traction of the denture using a dynamometer – intraoral view cameo surface of the denture was cleaned and polished. Statistics was done using SPSS version 16. Descriptive statistics (mean, standard deviation values), analysis of variance (ANOVA) and Shapiro–Wilk test (a test of normality in frequentist statistics) were used. The results were designated as “statistically significant” at p-value < 0,01. RESULTS: The results are measured or calculated in N (Newton) with accuracy of 0,5 N according to the measurement scale of the dynamometer. Mean and standard deviation of the force which is necessary to disturb the retention of a maxillary complete denture fabricated by conventional compression molding technique are shown on fig. 8. Fig. 8. Frequency distribution of the result for compression molding technique Fig. 6. Traction of the denture using a dynamometer – extraoral view The mean value for the conventional cuvette technique is 17,53N with standard deviation of 12,11N. Fig. 7. Dynamometer with stainless steel wire element used for traction Mean and standard deviation of the force required to displace upper complete denture fabricated by injection molding technique from the denture bearing area are shown on fig. 9. The results are documented in writing, dental photography was used as well. After all the measurements were done the fixed retention wire element was removed and the 1298 http://www.journal-imab-bg.org / J of IMAB. <strong>2016</strong>, vol. 22, issue 3/
Fig. 9. Frequency distribution of the result for injection molding technique The results in this clinical case exceeded both our preliminary expectations based on interim results of the study and literature data in similar studies. [9] The results of the comparison of dislodging forces which were registered in maxillary complete acrylic dentures fabricated by both techniques are shown on fig. 11 Fig. 11. A comparison of dislodging forces in maxillary complete acrylic dentures fabricated by compression molding and injection molding techniques The mean value for the injection molding technique is 20,73N with standard deviation of 13,89N. In all the cases except for one, the values recorded for complete dentures fabricated by compression molding technique were lower than those recorded for dentures fabricated by injection molding technology under constant pressure during the whole polymerization process. The results in one of the cases were remarkable- 72N for compression molding and 78,5N for injection molding technique. Both results significantly exceed the mean values in both groups. Fig. 10 The measurement of the force was done in an alternative way in this case as well as six others because the measurement of the dynamometer was insufficient (20N). The results were first registered by a portable electronic scale in grams which were converted in newtons according to the formula gram x g = N (g- local gravitational field of EarthH” 9, 81m/s 2 ) with accuracy of 0,5 N. Fig. 10 Fig. 10. The registered result of maxillary complete denture fabricated by injection molding technique 8035 grams was converted in newtons and the final result was 78,5N. Analysis of variance (ANOVA) revealed statistically significant differences in results achieved by conventional cuvette technique and injection molding technology. The results of injection technique were higher than those of compression molding technique (F=123,676, p< 0,001). DISCUSSION: In the present in vitro study the factors such as denture surface area and saliva could be eliminated because we explore two dentures which were made on duplicate casts for one and the same patient so these factors remain one and the same for both dentures fabricated by both technologies. So we assume that the interfacial surface tension and capillarity depend predominantly on the width of the space between the denture base and the mucosa. [1] Perfect adaptation between the tissues and the denture base would suggest smaller space between tissues and impression surface of the denture, greater interfacial surface tension and capillarity, respectively better adhesion and retention of the maxillary complete denture. By measuring the magnitude of the dislodging force which is necessary to displace the maxillary denture from the denture bearing area we could draw a conclusion about the fitting of the denture to the underlying tissues. Greater magnitude of this force is an evidence for higher interfacial surface tension and capillarity as well as more accurate fitting of the denture to the denture bearing area. This contributes to reduction of iatrogenic traumatic manifestations, increased retention and stability, higher mechanical strength of the maxillary complete acrylic denture and better patient’s comfort. Shapiro–Wilk test (a test of normality in frequentist statistics) reveals the mean values for both technologies – compression molding technique- 13,00-16,5N (Shapiro- Wilk=0,589, ð
Page 1 and 2:
e-ISSN: 1312-773X Journal of IMAB -
Page 3 and 4:
Journal of IMAB ISSN: 1312-773X htt
Page 5 and 6:
After 1998 the world of oncologic s
Page 7 and 8:
4. Mammographs Each year more than
Page 9 and 10:
patients having brain tumors [30, 3
Page 11 and 12:
CyberKnife measurements. Appl Radia
Page 13 and 14:
Fig. 1. Risk of emergency situation
Page 15 and 16:
REFERENCES: 1. Chakurova R, Mihailo
Page 17 and 18:
In addition, it was reported that l
Page 19 and 20:
observed between trismus and partia
Page 21 and 22:
of the neurosensory deficit of an L
Page 23 and 24:
of the patient (70%) over the right
Page 25 and 26:
Patel M. Iatrogenic mandibular frac
Page 27 and 28:
The surgery was held under local an
Page 29 and 30:
DISCUSSION: Excision of oral lesion
Page 31 and 32:
Page 33 and 34:
from its germ. Missing germs of sec
Page 35 and 36:
Page 37 and 38:
The results of the comparison of ag
Page 39 and 40:
Lichen simplex chronicus with a cut
Page 41 and 42:
of a simple lever (Hebelkonstruktio
Page 43 and 44:
Fig. 7. Gnathodynamometer for anima
Page 45 and 46:
RESULTS The findings revealed an un
Page 47 and 48:
Nowadays the quite common fast chew
Page 49 and 50:
Page 51 and 52:
[CrossRef] 4. Rodriguez AL. Atheros
Page 53 and 54:
le blind, placebo controlled trials
Page 55 and 56:
et al. Efficacy and safety of choli
Page 57 and 58:
Fig. 1a b. In the period September
Page 59 and 60:
A significant correlation (P=0.001)
Page 61 and 62: CONCLUSION Manual functional analys
Page 63 and 64: Fig. 1. Quadrantectomy with lymph n
Page 65 and 66: RESULTS: The performed study covere
Page 67 and 68: Journal of IMAB ISSN: 1312-773X htt
Page 69 and 70: demic nature of the diseases and re
Page 73 and 74: Fig. 5. Reduction of sites with PD>
Page 77 and 78: The third condition is related to t
Page 81 and 82: the unilateral location of the defe
Page 85 and 86: Five days after treatment clinical
Page 87 and 88: ite into the maxillary sinus. Br De
Page 89 and 90: A 68-year-old woman came to the dep
Page 91 and 92: in the skull, ethmoid sinuses, mand
Page 95 and 96: Fig. 4. CBCT of the silicone impres
Page 97 and 98: Fig. 11 a. STL model of the jaw in
Page 101 and 102: Fig. 6. Vacuum-forming foil covered
Page 103 and 104: Depending on the fixation method, t
Page 105 and 106: Fig. 23. Stereolithografic printed
Page 107 and 108: Fig. 28 a, b. - a software model of
Page 109 and 110: 21. Arisan V, Karabuda CZ, Ozdemir
Page 111: PURPOSE: The purpose of this in viv
Page 117 and 118: Fig. 3. Surgical portals are planne
Page 119 and 120: Fig. 8. Immediate postoperative pho
Page 121 and 122: Dupuytren’s contracture. N Engl J
Page 123 and 124: Technologies, Italy). After that, t
Page 125 and 126: Fig. 3. OCT images of the distal si
Page 127 and 128: makes this technique a promising no
Page 129 and 130: The discrepancy in the literature c
Page 131 and 132: (A) Gleason score 7 Legend: (A) Pea
Page 133 and 134: of prostate cancer. J Natl Cancer I
Page 135 and 136: Fig. 2. Scanning process; Several s
Page 137 and 138: 15. van der Meer WJ, Andriessen FS,
Page 139 and 140: MATERIALS AND METHODS We use data f
Page 141 and 142: in particular the need to pay for a
Page 143: APPLICATION OF 3D DIGITAL SCANNING
show all

JofIMAB-2016-vol22-issue3

Create successful ePaper yourself

Delete template?

Save as template?