Thermal alteration and morphological changes of sound and demineralized primary dentin after Er:YAG laser ablation

被引:12
作者
Brandao, Cristina Bueno [1 ]
Martins Giamatei Contente, Marta Maria [1 ]
De Lima, Fabricio Augusto [2 ]
Galo, Rodrigo [1 ]
Correa-Afonso, Alessandra Marques [1 ]
Bachmann, Luciano [2 ]
Borsatto, Maria Cristina [1 ]
机构
[1] Univ Sao Paulo, Fac Odontol Ribeirao Preto, Dept Clin Infantil Odontol Prevent & Social, BR-14040904 Ribeirao Preto, SP, Brazil
[2] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Fis, BR-14040904 Ribeirao Preto, SP, Brazil
关键词
temperature; SEM; decidous teeth; laser; ER-YAG LASER; PULSE REPETITION RATE; SHEAR BOND STRENGTH; CAVITY PREPARATION; ERYAG LASER; COMPOSITE RESTORATIONS; TEMPERATURE-CHANGES; HARD SUBSTANCES; SEM EXAMINATION; CARIES REMOVAL;
D O I
10.1002/jemt.21034
中图分类号
R602 [外科病理学、解剖学]; R32 [人体形态学];
学科分类号
100101 ;
摘要
The purpose of this study was to assess the influence of Er:YAG laser pulse repetition rate on the thermal alterations occurring during laser ablation of sound and demineralized primary dentin. The morphological changes at the lased areas were examined by scanning electronic microscopy (SEM). To this end, 60 fragments of 30 sound primary molars were selected and randomly assigned to two groups (n = 30); namely A sound dentin (control) and B demineralized dentin. Each group was divided into three subgroups (n = 10) according to the employed laser frequencies: I4 Hz; II6 Hz, and III10 Hz. Specimens in group B were submitted to a pH-cycling regimen for 21 consecutive days. The irradiation was performed with a 250 mJ pulse energy in the noncontact and focused mode, in the presence of a fine water mist at 1.5 mL/min, for 15 s. The measured temperature was recorded by type K thermocouples adapted to the dentin wall relative to the pulp chamber. Three samples of each group were analyzed by SEM. The data were submitted to the nonparametric Kruskal-Wallis test and to qualitative SEM analysis. The results revealed that the temperature increase did not promote any damage to the dental structure. Data analysis demonstrated that in group A, there was a statistically significant difference among all the subgroups and the temperature rise was directly proportional to the increase in frequency. In group B, there was no difference between subgroup I and II in terms of temperature. The superficial dentin observed by SEM displayed irregularities that augmented with rising frequency, both in sound and demineralized tissues. In conclusion, temperature rise and morphological alterations are directly related to frequency increment in both demineralized and sound dentin. Microsc. Res. Tech., 2011. (c) 2011 Wiley Periodicals, Inc.
引用
收藏
页码:126 / 132
页数:7
相关论文
共 51 条
[1]   Temperature rise during Er:YAG and Nd:YAP laser ablation of dentin [J].
Armengol, V ;
Jean, A ;
Marion, D .
JOURNAL OF ENDODONTICS, 2000, 26 (03) :138-141
[2]   Scanning electron microscopic analysis of diseased and healthy dental hard tissues after Er:YAG laser irradiation:: In vitro study [J].
Armengol, V ;
Jean, A ;
Rohanizadeh, R ;
Hamel, H .
JOURNAL OF ENDODONTICS, 1999, 25 (08) :543-546
[3]   Thermal effects of Er:YAG laser on a simulated dental pulp: a quantitative evaluation of the effects of a water spray [J].
Attrill, DC ;
Davies, RM ;
King, TA ;
Dickinson, MR ;
Blinkhorn, AS .
JOURNAL OF DENTISTRY, 2004, 32 (01) :35-40
[4]   Er:YAG laser cavity preparation and composite resin bonding with a single-component adhesive system:: Relationship between shear bond strength and microleakage [J].
Bertrand, Marie-France ;
Semez, Gianfranco ;
Leforestier, Eric ;
Muller-Bolla, Michele ;
Nammour, Samir ;
Rocca, Jean-Paul .
LASERS IN SURGERY AND MEDICINE, 2006, 38 (06) :615-623
[5]  
Borsatto MC, 2006, J DENT CHILD, V73, P122
[6]  
Castilho MS, 2007, J DENT CHILD, V74, P21
[7]   Performance of four dentine excavation methods in deciduous teeth [J].
Celiberti, P ;
Francescut, P ;
Lussi, A .
CARIES RESEARCH, 2006, 40 (02) :117-123
[8]  
Chaiyavej S, 2000, LASER SURG MED, V27, P341, DOI 10.1002/1096-9101(2000)27:4<341::AID-LSM7>3.0.CO
[9]  
2-S
[10]   Influence of Er:YAG laser on cavity preparation and surface treatment in microleakage of composite resin restorations [J].
Chinelatti, Michelle A. ;
Ramos, Renata P. ;
Chimello, Daniela T. ;
Corona, Silmara A. M. ;
Pecora, Jesus D. ;
Dibb, Regina G. Palma .
PHOTOMEDICINE AND LASER SURGERY, 2006, 24 (02) :214-218