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Article
Occlusal plane orientation with an extracranial posterior point of reference

Author: Munther N KAZANJI
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2002 Volume: 2 Issue: 4 Pages: 192-197
Publisher: Mosul University جامعة الموصل

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Abstract

This study was carried out to compare the location of occlusal plane, which exists in the natural dentition with the prosthetic occlusal plane when oriented according to Camper's line.Lateral cephalometric radiographs were obtained form (106) dentate subjects using a standard radiological technique.The results showed a variation between the orientation of the two planes. The plane extending from inferior border of ala of the nose to the inferior border of external auditory meatus was found to be reliable for the determination of occlusal plane of the artificial teeth.


Article
Evaluation of faults encountered in recording final impression

Authors: Ammar Kh Al–Nori --- Munther N Kazanji
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2010 Volume: 10 Issue: 19 Pages: 49-54
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: To evaluate the quality of the impressions recorded for fixed and removable partial dentures and for completely edentulous patients by describing the frequency of clinically detectable errors. Mate-rials and Methods: A total of 250 impressions were evaluated immediately after they were recorded by two examiners. Three different impression materials were employed. Data relating to errors and faults including those related to tray construction, or related to impression materials used and those related to the operator were evaluated and analyzed. Results: Of 100 irreversible hydrocolloid impres-sions for partially edentulous arches, 90% had one or more detectable errors; while for condensation type of silicon 50% had one or more detectable errors. For complete denture impressions, silicon rub-ber base showed the least errors than zinc oxide eugenol paste impression and irreversible hydrocolloid that showed the highest errors. For fixed partial denture, impressions were recorded by silicon rubber base; the occurrence of faults were as follow: Voids in finish line 20%, detachment 6.6%, tearing 6.6%, premature removal 10% and pressure area 3.3%. Conclusion: Irreversible hydrocolloid impression material showed the higher detectable errors. Key Words: Impression materials, faults of impressions, irreversible hydrocolloid, silicon impression.

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Article
The Effect of Denture Base Surface Treatments on Microlekage of Soft Lining Materials

Authors: Nadia T. Jaffer --- Munther N. Kazanji
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2009 Volume: 9 Issue: 18 Pages: 168-174
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the effect of two acrylic resin denture base surface trearments on microleakage
of 4 soft denture lining materials (Tru–soft, Bony plus, UfiGel–P and Molloplast–B after 2 periods of
storage and thermalcycling. Materials and methods: One hundred eighty specimens for microleakage
were prepared in a disc shape 30 mm diameter and 4 mm thickness (2 mm for acrylic resin part and 2
mm for soft lining material part). Soft lining materials were bonded to three different groups of
acrylic resin surface pretreatments (untreated, sandblasted and monomer treated denture base). These
specimens underwent two aging procedures: Storage with two periods (one week and one month), and
500 cycles of thermalcycling inside 2% methylene blue dye. Results: Statistical analysis showed that
treating the acrylic resin denture base by sandblasting increased microleakage of silicone–based linings
(UfiGel–P and Molloplast–B)and decreased microleakage of acrylic–based linings (Tru–soft and Bony
plus) in comparison to untreated denture base, while treating the denture base with MMA monomer
positively decreased microleakage for all tested soft lining materials in relation to untreated and
sandblasted denture base at one week storage, one month storage and at thermalcycling. Conclusions:
For all types of denture base surface treatments, microleakage was inevitable, however, wetting the
acrylic resin denture base with MMA monomer was more effective in reducing microkeakage than
sandblasted and untreated denture bases.

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Article
The Effect of Two Denture Adhesives on Maxillary Complete Denture Dislodgement. A Pilot Study

Authors: Mujahed T. Qasim --- Munther N. Kazanji
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2015 Volume: 15 Issue: 30 Pages: 381-386
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: The purpose of this study was to evaluate the effect of two denture adhesives on incisal bite force until denture dislodgement without and with the adhesive. This in-practice study assessed also patients’ perception regarding the use of adhesive. Materials and Methods: A total of 6 patients )2 men, 4 women( who wore complete maxillary and mandibular dentures were tested for denture performance both without and with denture adhesive. A locally constructed digital biting force device was used to measure the incisal bite force. Two adhesives pastes )Kin oro and Bony plus( were used in the study. Patients were asked to bite on the digital biting force device and the readings of incisal bite force were recorded. Patient perceptions )instant perception and delayed perception( after 1 week of using the denture adhesive were also assessed by a questionnaire and analyzed for denture performance on chewing and mastication, retention and fitness, confidence, comfort, and speaking. Results: The result showed that denture adhesives improved the incisal bite force of complete denture wearers significantly. The incisal bite force )in kg( )mean : without adhesive 1.78, with Kin oro 3.04, and with Bony plus 3.21(. There was an improvement in chewing and mastication, retention and fitness, confidence, comfort, and speaking after using both types of denture adhesives. Conclusions: The use of denture adhesive was found to be significantly effective in improving the incisal bite force of complete dentures until the dislodgement of upper denture. Bony plus paste adhesive was found to be more effective than Kin oro paste. Subjectively, the patients reported an improved perception of denture performance and that the use of adhesive provided greater confidence when using the prosthesis


Article
Evaluation of the effect of some denture cleansers on the colour of acrylic resin denture base materials

Authors: Munther N Kazanji --- Zina M Ahmad
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2004 Volume: 4 Issue: 8 Pages: 79-86
Publisher: Mosul University جامعة الموصل

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Abstract

The aims of this study were to evaluate the effect of denture cleansers on the colour of acrylic resin denture base material, and to evaluate the effect of particle size and surface roughness of acrylic resin material on their colour change. Sixty four acrylic specimens were prepared from the three types of acrylic resin materials of 30×20×1.5 mm (length× width× thickness, respectively). After the conditioning in distilled water, they were immersed in eight types of denture cleansers for 7 days. The colour changes were assessed using a computerized ultraviolet–visible spectrophotometer with accuracy up to 0.001. Visual examination of colour change was done by three independent examiners. The analysis of particle size was performed with a sieving machine. The surface roughness of acrylic specimens was measured using a computerized surface texture measuring and recording machine (Perthometer). A statistical analysis was performed using analysis of variance and Duncan's Multiple Range Test. The results revealed that there was a significant difference at p  0.01 between the tested solutions and also between the three types of acrylic resin materials. It was concluded that denture cleansers induced colour change of acrylic resin denture base materials. The self–curing acrylic exhibited the highest colour change. The smaller particle size and the smoothest surface of resin materials decreased the amount of colour change.


Article
Shear bond strength of fluoride release core materials to dentine

Authors: Munther N KAZANJI --- Ammar KH AL-NOORI
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2001 Volume: 1 Issue: 1 Pages: 50-60
Publisher: Mosul University جامعة الموصل

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Abstract

The aims of this study were to determine the mean shear bond strength of fast setting fluoride releasing core materials (vitremer core build up restorative system,compoglass F resin modified glass ionomer,Tetricceram composite and Definite composite) to dentin and the effect of one hour, 24 hour, and one week storage on mean shear bond strength. One hundred thirty molar teeth Were mounted in a plastic cylinder using self-curing resin, then the teeth were prepared to expose flat superficial dentinal surfaces. Each material was mixed according to the manufacturer ' s instruction ' s. A prefabricated nylon mold was applied to the exposed denton, filled with the core material, then light cured and stored in distilled water at 37°C for one hour, 24 hours and one week.The 24 hours and one week storage groups were thermocycled(5°C to 55°C) for 100 cycles before shearing, The specimen were tested with universal compression machine and the mode of failure was observed. The result showed that Vitrether core build up exhibited the greatest bond strength followed by compoglass F and then Tetrie Composite, Definite showed the lowest for all storage time.The differences among time groups were not statistically significant except for vitremer core build up and compoglass F which showed an improvement after 24 hour storage.The adhesive mode of failure revealed a combination of cohesive adhesive failure and failure for vitremer core build up and compoglass F and adhesive failure for Tetricceram and Definite composite resin


Article
The effect of particles size distribution of gypsum powder on cast surface roughness

Authors: Munther N KAZANJI --- Lamia T REJAB
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2002 Volume: 2 Issue: 3 Pages: 50-55
Publisher: Mosul University جامعة الموصل

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Abstract

The aim of this study was to determine effect of particle size distribution on surface roughness of stone cast poured from two gypsum products (ZETA and QD). Ten samples from each gypsum product were prepared, Measurements of surface roughness were carried out by profilometer. The analysis of particle size distribution of the gypsum products tested was performed with sieving machine.Analysis of variance and Duncan's multiple range test used for data analysis.The result showed that particles size distributions of the two gypsum products were significant affect the surface roughness of stone cast.It was concluded that the smoothest surface of stone cast was obtained from ZETA dental stone were attributed to the distribution of different size of stone particles.


Article
The effect of disinfectant solutions on the surface topography of acrylic denture base materials

Authors: Munther N KAZANJI --- Nadia H AL-KAZZAZ
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2002 Volume: 2 Issue: 3 Pages: 65-71
Publisher: Mosul University جامعة الموصل

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Abstract

The aim of this study was to measure the effect of different immersion period up to (7) days of acrylic denture base materials (heat cure acrylic Vertex and QD, and cold cure acrylic Miky-red and QD) in three types of disinfectant solutions (0.525% Sodium hypochlorite, 0.2% Chlorhexidine and 2% acidic Glutaraldehyde) on the Surface roughness.One hundred eighty acrylic plates were prepared from a base plate wax of (20mm × 10mm×2.5 ± 0.03mm) dimension using a conventional denture processing technique. From each type of acrylic denture base materials, (45) acrylic plates were prepared, which where intern divided into three groups: (15) unpolished (inner-side) Surface, (15) polished by conventional technique and (15) polished by a modificated polished technique.The surface roughness was measured by a prethometer.The results, revealed that there was a significant difference at (1%) level between the materials used, solution used, types of polishing technique and the time of immersion. The cold cure acrylic denture base material type (Miky-fed) showed the highest degree of the surface roughness, Photomicrograph microscopical study of the acrylic beads (mer-unit) showed the effect of the size of the beads on the surface roughness.It was concluded that the modificated polishing technique produces a Smoother surface for the acrylic denture base materials, the solutions and duration of immersion up to seven days showed a statistical significant difference but practically they can be used for denture disinfecting.


Article
Measurement of surface roughness of the stone cast poured on different impression materials

Authors: Munther N KAZANJI --- Lamia T REJAB
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2001 Volume: 1 Issue: SpIss Pages: S237-S246
Publisher: Mosul University جامعة الموصل

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Abstract

The aim of this study was to determine the mean roughness values of the stone casts Surfaces that were poured from two different gypsum products (ZETA and QD) dental stones on the three different impression materials (Supersil,Neogenate and Xanthano).Ten patients were selected to perform this study, for each patient six impressions were recorded. Sixty stone casts were poured and examined to evaluate surface roughness values. The stone casts were tested for surface roughness values with surface-roughness-measuring instrument,Profilometer(Perthometer).The data were statistically analyzed using ANOVA and Duncan's multiple range test.The results of this study showed that there were a significant differences in the mean roughness values of the stone casts among the three different impression materials and two different dental stones used at alevel of (P≤0.05).It was concluded that the smoothest surface of the stone cast were obtained from poured ZETA stone on Supersil impressions, while roughness surface were observed on the stone casts produced from poured QD dental stone on Xanthano impressions.


Article
The effect of different storage times and storage conditions of two types of alginate impression on accuracy of master cast

Authors: Najlan A JASIM --- Munther N KAZANJI
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2001 Volume: 1 Issue: SpIss Pages: S363-S374
Publisher: Mosul University جامعة الموصل

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Abstract

The aims of this study were to determine the effect of using different storage time and storage media on the accuracy of two types of alginate impression material,Hydrogum soft and Hydrogum elastic.One hundred sixty impressions were recorded from a standard acrylic model using perforated trays. These impressions were divided into three main groups. In the first group,(48) impressions were stored at (3) times interval namely (15) minutes,(30) minutes,(60) minutes and left on the bench uncovered. In the second one,(48) impressions were stored in disposable plastic bags at the same time interval mentioned above. In the third one,(48) impressions were divided into (3) subgroups, the first one were only washed with tap water before pouring, the other two subgroups were immersed in Sodium Hypochiorite(0.5%) and ChlorhexidineGluconate(0.5%) disinfectant solutions for (30) minutes before pouring,(16) impression will be taken and poured immediately to be considered as a control for this study.A three dimensional measuring machine (3D) was used for measuring the dimensional change of stone casts, the results showed that there was no significant differences of casts accuracy produced from the two types of an alginate impression material.Storage of alginate impression material at (15) and (30) minutes on the bench or inside sealed plastic bags showed no significant differences in dimensional changes compared with control samples that poured immediately, Storage to (60) minutes showed a significant difference,washing alginate with tap water and immersion in chlorhexidine disinfectant solution (0.5%) for (30) minutes showed no significant difference Immersion in sodium hypochlorite (0.5%) for (30) minutes showed significant changes.It was concluded that alginate impression could be stored for (30) minutes inside bags without significant changes if the pouring of alginate impression will be delayed for any reason.

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