Effect of water temperature and duration of immersion on the marginal accuracy of provisional crowns

Dhillon, Navneet K.; Kumar, Manjit; D'Souza, Dsj

doi:10.1016/s0377-1237(11)60049-x

Cited by 7 publications

(9 citation statements)

References 8 publications

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“…11 Even in cold water between 0 and 10°C there is delayed polymerization and poor marginal fit. 12 The mean gap formation for all the bis-acryl composite materials was comparable (Protemp 4 and Systemp.c&b); however, PEMA (Tempron) and PMMA (SC-10) had significantly greater marginal discrepancy. The least marginal gap formation was observed for Protemp 4 and the highest discrepancy was observed for SC-10.…”

Section: Discussionmentioning

confidence: 86%

To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study

Verma¹,

Kalra²,

Kumar³

et al. 2020

Dental Journal of Advance Studies

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Introduction Provisional restoration is a critical component of fixed prosthodontics treatment, which must satisfy many inter-relative factors such as biological, mechanical, and esthetic. These restorations should have accurate marginal adaptation and optimum strength to maintain functional demands. The present “in vitro” study was conducted to evaluate the effect of water temperature and duration of immersion, on the marginal adaptation and microhardness of four different commercially available provisional restorative materials. Materials and Methods The 240 specimens were then seated on the stainless-steel die which simulated the prepared tooth, and evaluated for the marginal gap for four different provisional restorative materials and divided into four different groups A, B, C, and D. Each group was further divided into six subgroups according to temperature of water and time of immersion. In each group the samples were immersed in water at 20, 30, and 40 degrees, respectively for 5 and 10-minutes duration. Four different temporary restorative materials for crown fabrication were loaded each time to make temporary crowns. Results Each sample was placed under travelling stereoscopic microscope (20× magnification) and photographed. Results for each surface were obtained, and the average of three surfaces was calculated. Knoop hardness was measured using a microhardness tester. The study was subjected to statistical analysis, to know the statistical significance, of the effect of difference in time and temperature changes at the time of final polymerization on surface microhardness and marginal integrity of four different provisional restorative materials. Discussion The mean marginal discrepancies of bis-GMA (group B) at 20, 30, and 40°C for 5 and 10 minutes in water were smaller than the results of other groups. Microhardness evaluation showed that the poly ethyl methacrylate (PEMA) type resin exhibited significantly lower microhardness than the bis-acryl resin composites (Protemp 4 and Systemp.c&b) at both time and temperature intervals. Conclusion The bis-acryl composites material has the least marginal discrepancy in comparison with PEMA and polymethyl methacrylate (PMMA). The bis-acryl composites materials exhibit superior surface microhardness followed by PEMA and PMMA.

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Section: Discussionmentioning

confidence: 86%

To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study

Verma¹,

Kalra²,

Kumar³

et al. 2020

Dental Journal of Advance Studies

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“…Deficiencies can occur when autopolymerizing acrylic resin is used owing to a dimensional contraction because of the difference in density between the polymer and monomer applied 30 . Temporary crowns maintained in water at 20-30° C for 10 min help to obtain a better marginal fit 31 . This technique decreases the monomer content and reduces the chance of irritation from the free monomer content, which may directly influence the polymerization shrinkage, and consequently the marginal adaptation.…”

Section: Discussionmentioning

confidence: 99%

Marginal adaptation of provisional crowns made of acrylic and bisacrylic resins using different impression materials

et al. 2019

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Aim: To evaluate the marginal adaptation of provisional crowns made of acrylic and bisacrylic resins using different impression materials. Methods: a metal die and a matrix applied through a direct technique were used to fabricate the specimens. The impression materials used as a matrix were divided into four groups: Irreversible hydrocolloid (IH), laboratory silicone (LS), condensation silicone (CS), and addition silicone (AS). After the impression procedures, each matrix was loaded with the provisional prosthetic materials, Alike, Duralay, Protemp 4, and Structur 3 (n = 12). Marginal discrepancy was evaluated using a stereomicroscope at ×45 magnification. The images obtained were transferred to the Corel Draw X7 program, and the distances from the cervical margins of the specimen to the reference lines at the metal die were measured vertically. The data were analyzed by using 2-way ANOVA followed by the Tukey test (α=.05). Results: the acrylic resins had higher values of marginal discrepancy compared to the bisacrylic resins. A statistically significant difference was found between all impression materials, and the irreversible hydrocolloid presented higher values of discrepancy (303.28–613.31 μm), whereas addition silicone had the lowest (48.61–190.06 μm). Conclusions: the bisacrylic resins had a better marginal adaptation compared to the acrylic resins. The addition silicone promoted a better marginal adaptation of the provisional prosthetic materials tested, followed by condensation silicone, laboratory silicone, and irreversible hydrocolloid.

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“…Критичне підвищення температури у пульповій камері зуба під час внутрішньоротової полімеризації пластмаси у процесі виготовлення тимчасових коронок може спричинити незворотнє пошкодження пульпи, яке пояснюється коагулюванням протоплазми її клітин [6,10,11,20]. Як було встановлено в ході експериментальних досліджень, при підвищенні температури всередині камери зуба навіть на 5,5°С спричиняє некроз пульпи у 15% зубів, на 11,1°С -у 60% зубів [4,6,9,11,20]. Для того, щоб попередити термічний опік пульпи препарованих зубів, варто володіти інформацією про ступінь на-грівання камери зуба при внутрішньоротовій полімеризації самотверднучих акрилових пластмасі композитів за умови застосування різних видів шаблонів для тимчасових коронок [6,8,11,14,20].…”

Section: вступunclassified

“…Недостатньо висвітлені питання репаративної регенерації та відновлення рельєфу ясенного краю в зоні фронтальної групи зубів після проведення реконструктивних ортопедичних заходів у разі відновлення зруйнованих коронок зубів та глибокої під'ясенної каріозної деструкції. Нечисельними в медичних джерелах інформації України є також відомості про ефективність та позитивні віддалені результати ортопедичного лікування, відновлених куксовими вкладками опорних зубів [3,4,12,16].…”

Section: вступunclassified

Experimental Study of Exotermic Effects Inside Dental Pulp Chamber When Applying Direct Technique of Manufacturing Temporary Crown

Ilchenko

Dydyk

2021

Act. Probl. of the Modern Med.

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The aim of this study is to determine the optimal combination of self-curing resins and type of matrix that provides a minimal temperature increase in the pulp chamber during the fabrication of temporary crowns. Material and methods. We designed as experimental model of direct temporary crown fabrication for extracted and than prepared molars. Intrapulpal temperature rise was measured in vitro conditions during polymerization of Protemp II (3M), Protemp 4 (3M), Visalis Temp (Kettenbach), Structur (Voco) and Carbodent (Stoma). Output and peak temperature findings of self-curing resin polymerization were recorded and values of temperature increase in the tooth chamber were calculated. Two types of materials were used to make external anatomical moulds: 1) silicone impression material Panasil Putty Soft of high and low viscosity and Panasil initial contact Light (Kettenbach) to make two-phase impression; 2) transparent thermoplastic polymer Erkodur (Erkodent), sheet of 1.0 mm thick, vacuum pressed. Results and Discussion. We obtained the following finding of the temperature rise inside the pulp chamber (polymer pattern / silicone matrix): Protemp IV (2,2˚C / 0,2˚C), VisalisTemp (3˚C / 0.3˚C), Protemp II (3,3˚C / 0,5˚C), Structur (3,4˚С/0,6˚С), Karbodent (6.7˚C / 3.0˚C). Conclusions. Exothermic effects during intra oral fabrication of temporary crowns can be minimized by polymerization of resins in the silicone mould as this material can absorb and dissipate heat.

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Effect of water temperature and duration of immersion on the marginal accuracy of provisional crowns

Cited by 7 publications

References 8 publications

To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study

To Evaluate the Effect of Water Temperature and Duration of Immersion on the Marginal Accuracy and Microhardness of Provisional Restoration: An In Vitro Study

Marginal adaptation of provisional crowns made of acrylic and bisacrylic resins using different impression materials

Experimental Study of Exotermic Effects Inside Dental Pulp Chamber When Applying Direct Technique of Manufacturing Temporary Crown

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