Objectives: The purpose of this study was to investigate the effect of different light-curing uni... more Objectives: The purpose of this study was to investigate the effect of different light-curing units and irradiation modes on degree of conversion (DC) in resin composite polymerization. Further aim was to evaluate the depth of cure of resin composite layers with the above mentioned different curing units. Materials and methods: 2 x 4 mm and 4 x 4 mm sized composite model resins were prepared from Filtek Z250 (3M, St Paul, MN, USA). The standard supplements were irradiated with 6 different curing units (conventional halogen, high power halogen, plasma arc (PAC) and 3 blue LED light-curing units) in different curing methods. After irradiation the specimens were stored in ethanol for 72 hours in dark at 25C. The ethanol solutions containing unpolymerized, dissolved monomer were analyzed with reversed phase high performance liquid chromatography (RP-HPLC). Results: The highest DC was observed from LED curing devices. There was no difference between DC used standard mode and soft-start e...
The purpose of this retrospective study was to evaluate and describe the occurrence of different ... more The purpose of this retrospective study was to evaluate and describe the occurrence of different deficiencies of composite restorations in molar and premolar teeth. Further aim was to investigate possible correlations between occurring malformations and the localization or size of the restorations. 240 class II composite restorations (in 85 patients) were involved in the study. Control examinations were carried out five years after restorations, according to the United States Public Health Services' criteria. Namely, anatomic form, marginal integrity, marginal stain, color stability, surface smoothness, and the presence of secondary caries or fractures of the restorations. The associations between variables were calculated by bivariate analyses using either Pearson chi-square or Fisher tests. P < 0.05 was considered significant. In 0.8% of the fillings, secondary caries and in 0.4% of the cases, fracture was found as a failure. The frequency of adjacent deficiencies were foun...
Objectives: Sialolithiasis affects approximately 1-2% of the population, causing frequently obstr... more Objectives: Sialolithiasis affects approximately 1-2% of the population, causing frequently obstructive and inflammatory malformations of the salivary glands. Sialoliths consist of both inorganic compounds (mainly calcium phosphate) and organic molecules. In the literature there are several contradicted theories about the composition and the spatial distribution of the organic constituents. Our aim was to examine the organic central core theory. Methods: The structure of 15 submandibular salivary stones were analysed with electro-microscopy (EM), scanning EM and two stones with micro computed tomography (CT). After structural analysis, the core and cortical region of intact other halves of stones were digested with trypsin after extraction, and then analysed with MALDI-TOF (matrix assisted laser desorption ionisation - time of flight) instrument. The peptide mass finger prints (PMF) were compared with the results of in silico digestion. Results: The ms/ms measurements were completed...
The aim of the authors was to describe the classic specific panoramic signs (indicating a close s... more The aim of the authors was to describe the classic specific panoramic signs (indicating a close spatial relationship between dental canal and third molar's root) on panoramic radiographic images and determine their role in the risk assessment, predicting inferior alveolar nerve (IAN) paresthesia after lower third molar removal. The authors represented an informative case, where the IAN was visible during the surgery. The exact knowledge of classic panoramic radiographic signs should help the determination of "high risk" cases predicting IAN paresthesia after mandibular third molar removal. The authors keep panoramic radiography rather a routine than the most superior diagnostic tool in third molar surgery.
The aim of the present study was to determine on panoramic radiographic images the effect of the ... more The aim of the present study was to determine on panoramic radiographic images the effect of the distance between the root curvatures and inferior alveolar canal (IAC) root tip overlap on the surgeon's risk assessment predicting inferior alveolar nerve (IAN) paresthesia after lower third molar removal. In this case-control study 41 cases with postoperative IAN paresthesia and 359 controls without any postoperative complications were involved. Demographic data, root curvatures and the extent of IAC-root tip overlap were registered. The cases of major curvature--larger than 90 degrees (P=0.015; odds ratio [OR]=2.65), the "deepest" superimposition (P<0.001; OR=1.96), female gender (P=0.020) and increased age (P=0.008) were significantly associated with IAN paresthesia. Assessing root curvatures and the extent of IAC-root tip overlap for predicting IAN paresthesia after mandibular third molar removal should help to improve risk assessment.
Sialolithiasis is a common disease of the salivary glands and a major cause of salivary gland dys... more Sialolithiasis is a common disease of the salivary glands and a major cause of salivary gland dysfunction. The dominance of submandibular sialoliths is widely investigated. Giant stones (>15 mm) are rare, approximately every tenth or twelfth of the stones belong to this category. Sialo-oral or sialo-cutaneous fistula formation promotes the growth of an excessive size. In their presentation, the authors would like to introduce the diagnostic and therapeutic process of a giant (27 mm) submandibular sialolith and give a review of the literature.
The aim of this study was to evaluate diagnostic role of the native x-ray and ultrasonography (US... more The aim of this study was to evaluate diagnostic role of the native x-ray and ultrasonography (US) in sialoadenitis and sialolithiasis. During a period of 30 months 52 patients were selected in a study group with lithiasis and adenitis of the major salivary glands. Panoramic and either occlusal plain radiographs (sublingual and submandibular cases) or anteroposterior "blowed out" bucca and intraoral bucca radiographs (parotid cases), and US were taken of all patients. Further investigations, such as CT, MRI or FNAB were performed to discover probable differential diagnostic problems. The sensitivity of US for salivary stones was 75.0%, for inflammation was 77.4%. The sensitivity of x-ray for salivary stones was 60.7%. The cumulative effectiveness of x-ray and US for sialolithiasis was 91.3%. In the remaining two cases of sialolithiasis, CT supported the earlier diagnosis. In sialoadenitis, twice FNAB, four times MRI verified the supposed diagnosis. Despite the advantages o...
This study investigated the exact intra-alveolar aetiology of a panoramic high-risk sign, darkeni... more This study investigated the exact intra-alveolar aetiology of a panoramic high-risk sign, darkening of the third molar roots. 83 mandibular third molar surgical removals demonstrating dark bands on the third molar roots in preoperative radiographs were included in this prospective study. Exposure of the inferior alveolar nerve (IAN), the root morphology of the third molar (e.g. groove or hook) and the integrity of the mandibular canal or lingual cortical wall were observed. Differences between single (increased radiolucency alone) and multiple darkening cases (increased radiolucency with accompanying &#39;high risk&#39; signs) and between IAN exposure and groove formation were analysed. In 38 cases (45.8%), the IAN was visible during the operation. Groove was present in 37.4% of cases. 26.5% of the cases showed lingual cortical thinning, while specious root conformation explained the formation of darkening on the radiographic images of an additional 9.6% of the cases. IAN exposure (P&lt;0.001) and groove formation (P&lt;0.001) were significantly more frequent in multiple darkening cases than in single darkening cases. According to these findings, darkening of the third molar roots is more often the result of fenestration of the inferior alveolar canal wall or groove formation of the root than lingual cortical thinning.
Dental materials : official publication of the Academy of Dental Materials, 2015
This 10-year retrospective study investigated the differences in the changes and the longevity of... more This 10-year retrospective study investigated the differences in the changes and the longevity of Class II restorations using 4 similar microhybrid resin composites (Filtek Z250, Herculite XR, Gradia Direct Posterior, Renew). Data were collected from patient records. Those patients who received posterior restoration between 2001 and 2003, and who still visited the clinical practice for regular check-up visits were selected. A total of 225 adult patients (86 males, 139 females) with 701 restorations were evaluated by 2 operators using the USPHS criteria. Data were analyzed with Fisher's Exact Test, Pearson's Chi-Square Test and Kaplan-Meier analysis (p<0.05). A failure rate of 2.1% was detected. The reasons of failures included restoration fracture, secondary caries and endodontic treatment. Similar survival rates for Gradia Direct Posterior (91.25%) and Renew (92.19%) were observed; better performance was observed with the Filtek Z250 (99.1%) and Herculite XR (98.64%). Th...
The aim of the present study was to examine the association between the darkening of the root on ... more The aim of the present study was to examine the association between the darkening of the root on the preoperative panoramic radiograph and intraoperative inferior alveolar nerve (IAN) exposure. In the present study, 116 mandibular third molar surgical extraction cases with darkening of the third molar roots on the preoperative panoramic radiographs were selected for a case group, and 193 patients with one or more of the following &amp;amp;amp;amp;amp;amp;amp;amp;quot;high-risk&amp;amp;amp;amp;amp;amp;amp;amp;quot; signs, indicating a close spatial relationship between the root and dental canal, were selected for the control group: interruption of the white line, diversion of the canal, and/or narrowing of the canal. The correlation between the radiographic markers and IAN exposure was estimated using bivariate analysis. The IAN was visible in 47 (15.2%) of 309 intraoperative extractions. Darkening of the third molar roots was significantly associated with IAN exposure (P &amp;amp;amp;amp;amp;amp;amp;amp;lt; .001). Those with both darkening and adjacent &amp;amp;amp;amp;amp;amp;amp;amp;quot;high-risk&amp;amp;amp;amp;amp;amp;amp;amp;quot; radiographic markers present simultaneously had a significantly greater risk of IAN exposure than those with darkening only (P &amp;amp;amp;amp;amp;amp;amp;amp;lt; .001) or any other combination of multiple high-risk factors (P = .001). Significant differentiation between isolated darkening and darkening with both adjacent and high-risk signs seems to be essential in predicting IAN exposure.
A novel use of site-limited platysma-based transpositional flap is demonstrated and discussed for... more A novel use of site-limited platysma-based transpositional flap is demonstrated and discussed for the reconstruction of facial defects. Between January 1985 and January 2001, 342 patients were operated on for advanced oral-oropharyngeal and orofacial cancers. In 6 cases, a platysma-based transpositional flap was used for external closure of facial through-and-through defects. Internally, the saved oral mucosa was used in 4 patients and fasciocutaneous forearm free flaps in 2 patients. The facial artery was blocked in all cases. The postoperative course was uneventful except in 1 case, when partial loss of the flap was observed intraorally. The externally used transpositional platysma-based flap showed cosmetic and functional advantages: its consistency, color, and texture were similar to those of the original facial tissues, the area of operation was the same, and the donor site was closed primarily. The site-limited platysma-based myocutaneous transpositional flap is usable and safe even in those cases in which circulation of the facial artery is damaged or local vascular compromise has occurred and the facial through-and-through defect is extended. The facial reconstruction described is one of several applicable reconstructive methods that may be chosen for special facial defects. The method is not applicable when the neck is radically operated on (radical neck dissection) and/or irradiated. No similar use of platysma-based transpositional flaps has been reported thus far.
Objectives: The purpose of this study was to investigate the effect of different light-curing uni... more Objectives: The purpose of this study was to investigate the effect of different light-curing units and irradiation modes on degree of conversion (DC) in resin composite polymerization. Further aim was to evaluate the depth of cure of resin composite layers with the above mentioned different curing units. Materials and methods: 2 x 4 mm and 4 x 4 mm sized composite model resins were prepared from Filtek Z250 (3M, St Paul, MN, USA). The standard supplements were irradiated with 6 different curing units (conventional halogen, high power halogen, plasma arc (PAC) and 3 blue LED light-curing units) in different curing methods. After irradiation the specimens were stored in ethanol for 72 hours in dark at 25C. The ethanol solutions containing unpolymerized, dissolved monomer were analyzed with reversed phase high performance liquid chromatography (RP-HPLC). Results: The highest DC was observed from LED curing devices. There was no difference between DC used standard mode and soft-start e...
The purpose of this retrospective study was to evaluate and describe the occurrence of different ... more The purpose of this retrospective study was to evaluate and describe the occurrence of different deficiencies of composite restorations in molar and premolar teeth. Further aim was to investigate possible correlations between occurring malformations and the localization or size of the restorations. 240 class II composite restorations (in 85 patients) were involved in the study. Control examinations were carried out five years after restorations, according to the United States Public Health Services' criteria. Namely, anatomic form, marginal integrity, marginal stain, color stability, surface smoothness, and the presence of secondary caries or fractures of the restorations. The associations between variables were calculated by bivariate analyses using either Pearson chi-square or Fisher tests. P < 0.05 was considered significant. In 0.8% of the fillings, secondary caries and in 0.4% of the cases, fracture was found as a failure. The frequency of adjacent deficiencies were foun...
Objectives: Sialolithiasis affects approximately 1-2% of the population, causing frequently obstr... more Objectives: Sialolithiasis affects approximately 1-2% of the population, causing frequently obstructive and inflammatory malformations of the salivary glands. Sialoliths consist of both inorganic compounds (mainly calcium phosphate) and organic molecules. In the literature there are several contradicted theories about the composition and the spatial distribution of the organic constituents. Our aim was to examine the organic central core theory. Methods: The structure of 15 submandibular salivary stones were analysed with electro-microscopy (EM), scanning EM and two stones with micro computed tomography (CT). After structural analysis, the core and cortical region of intact other halves of stones were digested with trypsin after extraction, and then analysed with MALDI-TOF (matrix assisted laser desorption ionisation - time of flight) instrument. The peptide mass finger prints (PMF) were compared with the results of in silico digestion. Results: The ms/ms measurements were completed...
The aim of the authors was to describe the classic specific panoramic signs (indicating a close s... more The aim of the authors was to describe the classic specific panoramic signs (indicating a close spatial relationship between dental canal and third molar's root) on panoramic radiographic images and determine their role in the risk assessment, predicting inferior alveolar nerve (IAN) paresthesia after lower third molar removal. The authors represented an informative case, where the IAN was visible during the surgery. The exact knowledge of classic panoramic radiographic signs should help the determination of "high risk" cases predicting IAN paresthesia after mandibular third molar removal. The authors keep panoramic radiography rather a routine than the most superior diagnostic tool in third molar surgery.
The aim of the present study was to determine on panoramic radiographic images the effect of the ... more The aim of the present study was to determine on panoramic radiographic images the effect of the distance between the root curvatures and inferior alveolar canal (IAC) root tip overlap on the surgeon's risk assessment predicting inferior alveolar nerve (IAN) paresthesia after lower third molar removal. In this case-control study 41 cases with postoperative IAN paresthesia and 359 controls without any postoperative complications were involved. Demographic data, root curvatures and the extent of IAC-root tip overlap were registered. The cases of major curvature--larger than 90 degrees (P=0.015; odds ratio [OR]=2.65), the "deepest" superimposition (P<0.001; OR=1.96), female gender (P=0.020) and increased age (P=0.008) were significantly associated with IAN paresthesia. Assessing root curvatures and the extent of IAC-root tip overlap for predicting IAN paresthesia after mandibular third molar removal should help to improve risk assessment.
Sialolithiasis is a common disease of the salivary glands and a major cause of salivary gland dys... more Sialolithiasis is a common disease of the salivary glands and a major cause of salivary gland dysfunction. The dominance of submandibular sialoliths is widely investigated. Giant stones (>15 mm) are rare, approximately every tenth or twelfth of the stones belong to this category. Sialo-oral or sialo-cutaneous fistula formation promotes the growth of an excessive size. In their presentation, the authors would like to introduce the diagnostic and therapeutic process of a giant (27 mm) submandibular sialolith and give a review of the literature.
The aim of this study was to evaluate diagnostic role of the native x-ray and ultrasonography (US... more The aim of this study was to evaluate diagnostic role of the native x-ray and ultrasonography (US) in sialoadenitis and sialolithiasis. During a period of 30 months 52 patients were selected in a study group with lithiasis and adenitis of the major salivary glands. Panoramic and either occlusal plain radiographs (sublingual and submandibular cases) or anteroposterior "blowed out" bucca and intraoral bucca radiographs (parotid cases), and US were taken of all patients. Further investigations, such as CT, MRI or FNAB were performed to discover probable differential diagnostic problems. The sensitivity of US for salivary stones was 75.0%, for inflammation was 77.4%. The sensitivity of x-ray for salivary stones was 60.7%. The cumulative effectiveness of x-ray and US for sialolithiasis was 91.3%. In the remaining two cases of sialolithiasis, CT supported the earlier diagnosis. In sialoadenitis, twice FNAB, four times MRI verified the supposed diagnosis. Despite the advantages o...
This study investigated the exact intra-alveolar aetiology of a panoramic high-risk sign, darkeni... more This study investigated the exact intra-alveolar aetiology of a panoramic high-risk sign, darkening of the third molar roots. 83 mandibular third molar surgical removals demonstrating dark bands on the third molar roots in preoperative radiographs were included in this prospective study. Exposure of the inferior alveolar nerve (IAN), the root morphology of the third molar (e.g. groove or hook) and the integrity of the mandibular canal or lingual cortical wall were observed. Differences between single (increased radiolucency alone) and multiple darkening cases (increased radiolucency with accompanying &#39;high risk&#39; signs) and between IAN exposure and groove formation were analysed. In 38 cases (45.8%), the IAN was visible during the operation. Groove was present in 37.4% of cases. 26.5% of the cases showed lingual cortical thinning, while specious root conformation explained the formation of darkening on the radiographic images of an additional 9.6% of the cases. IAN exposure (P&lt;0.001) and groove formation (P&lt;0.001) were significantly more frequent in multiple darkening cases than in single darkening cases. According to these findings, darkening of the third molar roots is more often the result of fenestration of the inferior alveolar canal wall or groove formation of the root than lingual cortical thinning.
Dental materials : official publication of the Academy of Dental Materials, 2015
This 10-year retrospective study investigated the differences in the changes and the longevity of... more This 10-year retrospective study investigated the differences in the changes and the longevity of Class II restorations using 4 similar microhybrid resin composites (Filtek Z250, Herculite XR, Gradia Direct Posterior, Renew). Data were collected from patient records. Those patients who received posterior restoration between 2001 and 2003, and who still visited the clinical practice for regular check-up visits were selected. A total of 225 adult patients (86 males, 139 females) with 701 restorations were evaluated by 2 operators using the USPHS criteria. Data were analyzed with Fisher's Exact Test, Pearson's Chi-Square Test and Kaplan-Meier analysis (p<0.05). A failure rate of 2.1% was detected. The reasons of failures included restoration fracture, secondary caries and endodontic treatment. Similar survival rates for Gradia Direct Posterior (91.25%) and Renew (92.19%) were observed; better performance was observed with the Filtek Z250 (99.1%) and Herculite XR (98.64%). Th...
The aim of the present study was to examine the association between the darkening of the root on ... more The aim of the present study was to examine the association between the darkening of the root on the preoperative panoramic radiograph and intraoperative inferior alveolar nerve (IAN) exposure. In the present study, 116 mandibular third molar surgical extraction cases with darkening of the third molar roots on the preoperative panoramic radiographs were selected for a case group, and 193 patients with one or more of the following &amp;amp;amp;amp;amp;amp;amp;amp;quot;high-risk&amp;amp;amp;amp;amp;amp;amp;amp;quot; signs, indicating a close spatial relationship between the root and dental canal, were selected for the control group: interruption of the white line, diversion of the canal, and/or narrowing of the canal. The correlation between the radiographic markers and IAN exposure was estimated using bivariate analysis. The IAN was visible in 47 (15.2%) of 309 intraoperative extractions. Darkening of the third molar roots was significantly associated with IAN exposure (P &amp;amp;amp;amp;amp;amp;amp;amp;lt; .001). Those with both darkening and adjacent &amp;amp;amp;amp;amp;amp;amp;amp;quot;high-risk&amp;amp;amp;amp;amp;amp;amp;amp;quot; radiographic markers present simultaneously had a significantly greater risk of IAN exposure than those with darkening only (P &amp;amp;amp;amp;amp;amp;amp;amp;lt; .001) or any other combination of multiple high-risk factors (P = .001). Significant differentiation between isolated darkening and darkening with both adjacent and high-risk signs seems to be essential in predicting IAN exposure.
A novel use of site-limited platysma-based transpositional flap is demonstrated and discussed for... more A novel use of site-limited platysma-based transpositional flap is demonstrated and discussed for the reconstruction of facial defects. Between January 1985 and January 2001, 342 patients were operated on for advanced oral-oropharyngeal and orofacial cancers. In 6 cases, a platysma-based transpositional flap was used for external closure of facial through-and-through defects. Internally, the saved oral mucosa was used in 4 patients and fasciocutaneous forearm free flaps in 2 patients. The facial artery was blocked in all cases. The postoperative course was uneventful except in 1 case, when partial loss of the flap was observed intraorally. The externally used transpositional platysma-based flap showed cosmetic and functional advantages: its consistency, color, and texture were similar to those of the original facial tissues, the area of operation was the same, and the donor site was closed primarily. The site-limited platysma-based myocutaneous transpositional flap is usable and safe even in those cases in which circulation of the facial artery is damaged or local vascular compromise has occurred and the facial through-and-through defect is extended. The facial reconstruction described is one of several applicable reconstructive methods that may be chosen for special facial defects. The method is not applicable when the neck is radically operated on (radical neck dissection) and/or irradiated. No similar use of platysma-based transpositional flaps has been reported thus far.
Uploads
Papers by József Szalma