ABSTRACT
BACKGROUND: In general, people speak and swallow frequently in their daily lives rather than making exaggerated tongue movements. AIM: The aim was to compare the effect of tongue movements on lingual sulcus depth, during the border molding process of impression making of mandibular complete dentures. SETTINGS AND DESIGN: In total, 32 double master impressions were made. One of these pairs was obtained by allowing the patient to swallow and the other by enabling the tongue to make excessive movements. MATERIALS AND METHODS: Measurements were taken from different regions of the lingual sulcus by determining the length of the parallel lines drawn from fixed points marked on the residual ridge crest to the deepest point of the alveolingual sulcus. These measurements were performed using a RMI three-dimensional measurement system. STATISTICAL ANALYSIS USED: Data were compared using the paired t-test (alpha = 0.05). RESULTS AND CONCLUSION: The high value found in casts with border molding, while swallowing was statistically significant in vertical and horizontal directions of the anterior lingual sulcus region (<0.001), vertical direction of the middle lingual sulcus region (MLSR) (<0.05) and horizontal direction of the retromylohyoid and MLSR (<0.05). According to the paired t-test, the mean differences between the 32 casts were statistically significant (<0.001). Within the limitations of this study, the swallowing in the vertical and horizontal directions provided higher values compared to the excessive movement of the tongue.
Subject(s)
Denture Design , Denture, Complete , Mandible , Tongue/physiology , Dental Impression Technique , HumansABSTRACT
AIMS: To evaluate the effects of two different surface treatments and bonding agents on tensile bond strength between a Co-Cr and a Ni-Cr cast alloy and two resin-luting cements. MATERIALS AND METHODS: Two hundred and forty alloy samples were cast and subjected to surface treatments such as sandblasting, chemical etching, and sandblasting plus chemical etching. Panavia F and CandB cement were used as cementing mediums. The etching qualities were examined by a stereooptic microscope. Failure surfaces were examined throughout scanning electron microscopy. The data were evaluated using statistical methods, namely analysis of variance and multiple comparison test (Tukey HSD). RESULTS: Significant differences were found in the bonding provided by the various cements (P < 0.001) and also type of surface treatments (P < 0.001). For all groups, sandblasted surfaces showed the highest bond strength values. There was no significant difference between the Cr-Co and the Cr-Ni alloys (P > 0.05). CONCLUSIONS: Panavia F showed higher tensile strength and the sandblasted samples possessed higher tensile strength.
Subject(s)
Composite Resins/chemistry , Dental Alloys/chemistry , Dental Bonding , Dental Etching/methods , Resin Cements/chemistry , Acid Etching, Dental/methods , Adhesiveness , Aluminum Oxide/chemistry , Boron Compounds/chemistry , Chromium Alloys/chemistry , Cobalt/chemistry , Dental Polishing/instrumentation , Dental Polishing/methods , Humans , Materials Testing , Methacrylates/chemistry , Methylmethacrylates/chemistry , Microscopy, Electron, Scanning , Nickel/chemistry , Stress, Mechanical , Surface Properties , Temperature , Tensile Strength , Time Factors , Water/chemistryABSTRACT
This study assessed the plasma and blood concentrations of Cr, Co, and Ni among subjects using removable partial dentures. A comparison was made between subjects with and without RPD treatment history. Control group consisted of 10 healthy individuals without dentures. Concentrations of Cr, Co, and Ni in subjects' plasma and blood were measured with an atomic absorption spectrophotometer. Data were statistically analyzed by ANOVA, and multiple comparison test (alpha = 0.05) was used to identify significant differences between groups. RPD use had a significant effect on the concentrations of Cr (P < 0.001) and Ni (P < 0.05) in blood and plasma. As such, there were statistically significant differences between the control and study groups for the concentrations of Cr and Ni in blood and plasma. However, RPD use exhibited no significant effect on Co concentration in plasma. In conclusion, the use of removable partial dentures with metal frameworks led to an increase in the concentrations of Cr and Ni in both blood and plasma.
Subject(s)
Chromium Alloys , Chromium/blood , Cobalt/blood , Denture, Partial, Removable , Nickel/blood , Analysis of Variance , Case-Control Studies , Female , Humans , Male , Spectrophotometry, Atomic , Statistics, NonparametricABSTRACT
In this study, we investigated the effect of different solutions--coffee, tea, Turkish coffee, artificial saliva, mouthwash, denture cleanser, and distilled water--on the bond strength of soft lining materials (one acrylic- and three silicone-based) to acrylic resin. Acrylic specimens (40x10x10 mm) were prepared for the bond strength test. The specimens were stored in different solutions and tested after 24 hours, seven days, and 30 days. Using analysis of variance, the bond strength of soft lining materials to acrylic resin was found to be related to the type of material, storage time, and storage solution. Visco-gel had the lowest bond strength to cured acrylic resin, where its strength ranged from 0.149 MPa to 0.784 MPa. The bond strength of Visco-gel was also found to increase with time. Molloplast-B and Ufi Gel P demonstrated better bond strength than Visco-gel and Mollosil.
Subject(s)
Acrylic Resins/chemistry , Beverages/adverse effects , Dental Bonding/methods , Analysis of Variance , Denture Cleansers/adverse effects , Mouthwashes/adverse effects , Saliva, Artificial/adverse effects , Tensile StrengthABSTRACT
An adult male patient who had lost his maxillary left central incisor seven years ago in a traffic accident presented with a chief complaint about his unaesthetic appearance associated with the loss of his maxillary left central incisor space, a Class III molar occlusion, and an anterior open bite malocclusion due to tongue-thrust swallowing. Fixed orthodontic treatment was rendered following fan-type expansion of the maxilla. A Maryland bridge as a minimally invasive dentistry approach was used as a retention appliance and the patient's aesthetic appearance was restored.
Subject(s)
Denture, Partial, Fixed, Resin-Bonded , Malocclusion, Angle Class III/therapy , Open Bite/therapy , Orthodontics, Corrective , Tooth Avulsion/rehabilitation , Accidents, Traffic , Adult , Cementation , Cephalometry , Humans , Incisor/injuries , Male , Malocclusion, Angle Class III/complications , Maxilla , Open Bite/complications , Orthodontic Extrusion , Orthodontic Retainers , Palatal Expansion Technique , Space Maintenance, Orthodontic , Tooth Avulsion/complicationsABSTRACT
The purpose of this in vitro study was to compare the tear energy of three silicone rubber materials and two acrylic resin soft lining materials in different solutions and times of storage. The tear energy of specimens stored in artificial saliva, denture cleanser and distilled water was measured over 1, 4, and 16 weeks, using a tensile testing machine. Data were analyzed with a one-way analysis of variance and a Duncan multiple comparison test. Silicone rubber materials had the least tear energy. The type of material, time of storage and solution were statistically significant factors affecting on tear energy. The ability of the material to resist rupture during normal use (including constantly being in saliva and usually immersed in denture cleanser or water for storage) is of practical importance.
