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Laith Mahmoud Abdulhadi
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Dentistry

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EFFECT OF DESIGN CHANGING OF RING CLASP ON ITS RETENTIVE FORCE: EFEK PERUBAHAN DESAIN RING CLASP TERHADAP KEKUATAN RETENSI Laith Mahmoud Abdulhadi; Bilal Diab Saad Asoudi
Dentika: Dental Journal Vol. 15 No. 1 (2010): Dentika Dental Journal
Publisher : TALENTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (189.836 KB) | DOI: 10.32734/dentika.v15i1.1679

Abstract

Different designs of ring clasp were indicated in short or long span bounded saddle. However, few researches have been done to calculate their retentive absolute forces. The purpose of this in-vitro study was to measure the retentive force of four different ring clasp designs. A test model was made from maxillary plastic replica. Second molar was seated in silicone mould then poured with dental stone. 24 cobalt-chromium ring clasp designs were fabricated to engage 0.5mm undercut using standard casting technique. They were examined radiographically for any casting defects. The dislodging force was measured for each clasp using universal testing machine. The results showed that ring clasp design 2 produced the highest retentive force, while, clasp 4 was the lowest among the other clasps. In addition, significant difference regarding the mean retentive force was estimated among designs 1, 2 and 4. The means of retentive force of ring 1, 2, 3, and 4 were equal to 17.40 ±2.97, 17.52 ±3.05, 12.35±0 .98, and 11.15±2.15 N, respectively. Modifying the ring clasp design by adding extra rest or fortification will change its retentive force using the same undercut depth. Each ring design provides definite retentive force. As conclusion, each ring clasps design offered specific retentive force in dry environ-ment. However design 2 presented the highest force rate while design 4 was the least retentive.
CLASP RETENTION USING VARIABLE UNDERCUT DEPTHS: RETENSI CANGKOLAN MENGGUNAKAN VARIABEL KEDALAMAN GERUNGAN Laith Mahmoud Abdulhadi; Belal Mourshed
Dentika: Dental Journal Vol. 15 No. 1 (2010): Dentika Dental Journal
Publisher : TALENTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.496 KB) | DOI: 10.32734/dentika.v15i1.1682

Abstract

Retentive force may be increased in deeper undercuts. Three clasps were examined for this hypothesis in order to analyze the retentive force change properties for each clasp design with increasing undercut depth only. A total of 36 cobalt-chromium clasps, using half-round pattern and standard casting technique were fabricated. Three groups of clasps; Rest-Plate-Akers system, half-half, and Akers were engaged in 3 increasing undercut depths (0.25, 0.35, and 0.5 mm) on natural premolars. The test model was stone duplicate of plastic replica. Clasp retentive force was measured using universal testing machine. The results showed that the retentive forces for the tested undercuts (0.25, 0.35 and 0.5mm) were 8.59±1.89, 14.74±2.70 and 15.21±1.17 N for Akers; 3.06±0.88, 4.26±0.29, and 5.9±0.53 for half-half; and 0.9±0.15, 2.06±0.60, 2.3±0.50 N for Rest-Plat-Akers system respectively. Besides, the retentive force for each clasp design increased in a different way with each incremental augmentation of undercut depth. As a conclusion, changing the undercut depth altered the retentive force of the used clasp. Therefore, a clasp chosen for a definite undercut depth also can be used for deeper undercut on the same abutment when higher retentive force is required with respect to the other indication criteria.
SUCCESSIVE OBTURATOR-OVERDENTURE DESIGNS FOR LONG HISTORY CLEFT PALATE PATIENT: RANCANGAN OVERDENTURE-OBTURATOR PADA PENDERITA CLEFT PALATE Laith Mahmoud Abdulhadi
Dentika: Dental Journal Vol. 15 No. 2 (2010): Dentika Dental Journal
Publisher : TALENTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (239.625 KB) | DOI: 10.32734/dentika.v15i2.1941

Abstract

A 39 year cleft palate lady had been treated since she was 19 years old by different design obturators after partial breakdown of surgical correction. The first obturator was fabricated into two pieces connected to each other using mini-dental magnets. A new obturator was prescribed to the patient and constructed in one piece with hollow opened box. Later, the box window was closed and retained by three ready-made ball stainless steel clasps. Two years later due to caries, a new obturator was designed with hollow palate and nasal box and retained by three magnets placed over three remaining abutment teeth into their cast copings.
RESIDUAL ALVEOLAR RIDGE RESORPTION IN COMPLETELY EDENTULOUS PATIENTS INFLUENCED BY PATHOPHYSIOLOGIC FACTORS: RESORPSI TINGGI TULANG ALVEOLAR PADA PASIEN TIDAK BERGIGI YANG DIPENGARUHI OLEH FAKTOR PATOFISIOLOGI Laith Mahmoud Abdulhadi; Kasiapan; Saad
Dentika: Dental Journal Vol. 14 No. 1 (2009): Dentika Dental Journal
Publisher : TALENTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (180.832 KB) | DOI: 10.32734/dentika.v14i1.1971

Abstract

Residual ridge resorption and remodeling directly affect the function of removable prostheses which relies greatly onthe quantity and architecture of jaw bones. The purpose of this study was to assess the remaining bone height level inrelation to some pathophysiologic factors that may affect on the resorption process. The factors involved in this studywere Diabetes mellitus, periodontitis, menopause, and edentulousness time (more than 10 years). Maxillary andmandibular bone height on 115 dental panoramic radiographs belonged to full edentulous patients were measured andcompared to 35 controls using MB Ruler software. The soft images were collected using the radiographic machines inthe faculty of dentistry. The measurements included maxillary middle anterior and lateral bone heights, middlemandibular dimension, right and left mental bone heights. The results showed that women with completely edentulousarches showed relatively higher rate of bone resorption than men, and control group. Indian patients also demonstratedhigher bone resorption rate, particularly on the mandible, followed by Chinese and Malay. In regard to different healthconditions, edentulousness time for more than 10 years showed the minimal bone height reduction that affected mainlythe mandible sides compared to other conditions and the control group. On the sides of maxilla, periodontitis exhibitedhigher effect on the residual ridge resorption rather than other studied conditions. However, on the middle of maxilla,menopause was associated with maximum bone resorption compared to the others. As conclusions, residual ridgeresorption in completely edentulous patients may be influenced by gender, race and patient’s health conditions.
Co-Authors Belal Mourshed Bilal Diab Saad Asoudi Kasiapan Saad